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Letchaysaybeejen > Refresher Exam Part 2 > Flashcards

Refresher Exam Part 2 Flashcards

1
Q

If a right circular cone is cut parallel with the axis of symmetry, it will reveal a/an

A. circle
B. hyperbola
C. ellipse
D. parabola

A

B. hyperbola

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2
Q

If the second derivative of the equation of a curve is equal to the negative of the equation of that same curve, the curve is

A. an exponential
B. a tangent
C. a conic section
D. a sinusoid

A

D. a sinusoid

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3
Q

An exclusive right granted by the government for the manufacture, use and sale of a specific product.

A. copyright
B. trademark
C. patent
D. goodwill

A

C. patent

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4
Q

The highest ordinate on the stress-strain curve.

A. ultimate strength
B. yield strength
C. rupture point
D. proportional limit

A

A. ultimate strength

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5
Q

Which does not belong to the group?

A. microjoule
B. watts
C. kilowatt-hour
D. ergs

A

B. watts

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6
Q

What is the molecular weight of sucrose?
A. 180
B. 240
C. 300
D. 342

A

D. 342

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7
Q

Who coined the term serendipity?
A. Horace Walpole
B. Archimedes
C. Wilhelm Roentgen
D. Neils Bohr

A

A. Horace Walpole

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8
Q

Who discovered radioactivity?
A. Henri Becquerel
B. Piere& Marie Curie
C. Wilhelm Roentgen
D. Neils Bohr

A

A. Henri Becquerel

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9
Q

Which control system is used for multi-input, multi-output system?

A. cascade control
B. feedforward control
C. feedbackward control
D. model predictive control

A

D. model predictive control

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10
Q

A control structure with two feedback controller with the output of the primary controller changes the set
point of the secondary controller whose output goes to the final controller.

A. feedforward control
B. ratio control
C. cascade control
D. override control

A

C. cascade control

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11
Q

Location 1 is 3 m away from location 2. A man walks 4 m and 40 degrees to location 3. How far is location 3 to location 2?

A. 2.57 m
B. 3.42 m
C. 4.16 m
D. 4.77 m

A

A. 2.57 m

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12
Q

A 100 N box rest on a 45 degrees incline plane, if the coefficient of friction between the block and the
inclined plane is 0.25, calculate the horizontal force that can start the box from moving upward.

A. 1055.44 N
B. 1220.75N
C. 1477.42 N
D. 1666.67 N

A

D. 1666.67 N

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13
Q

In a process in which it is used as solvent, benzene is evaporated into dry nitrogen. At 297ºK and 101.3
kPa, the resulting mixture has a percentage relative humidity of 60. It is required to recover 80 percent
of the benzene present by cooling to 283 K and compressing to a suitable pressure. What should this
pressure be? The vapor pressure of benzene is 12.2 kPa at 297K and 6 kPa at 283 K.

A. 120 kPa
B. 210 kPa
C. 392 kPa
D. 480 kPa

A

C. 392 kPa

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14
Q

A boiler plant raises 5.2 kg/s of steam at 1825 kN/m2 pressure, using coal of calorificvalue 27.2 MJ/kg.
If the boiler efficiency is 75%, how much coal is consumed per day?If the steam is used to generate electricity, what is the power generation in kilowatts assuming a 20% conversion efficiency of the turbines and generators?
A 0.713 kg/s; 3 MW
B. 1.322 kg/s, 4.5 MW
C. 2.144 kg/s, 1.5 MW
D. 0.144 kg/s, 6 MW

A

A 0.713 kg/s; 3 MW

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15
Q

A benzene-toluene feed (with 40 mol% benzene and 60 mol% toluene) to a distillation column is at a
temperature of 20ºC. The molar heat capacity of the feed is 159.2 kJ/kmol-K. Molar heats of vaporization of benzene and toluene are 30,813 and 33,325 kJ/kmol, respectively. The bubble point of the mixture is 95ºC. The slope of the feed line is closest to

A. 0
B. 1
C. 3.7
D. -3

A

C. 3.7

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16
Q

A high speed diesel engine burns fuel to give an exhaust gas analyzing 7.14%CO2, 4.28% CO, 8.24% O2 and 80.34% N2. The cetane number of the fuel fired is

A. 44.58
B. 45.20
C. 52.38
D. 50.28

A

A. 44.58

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17
Q

The second is the duration of radiation of what radioactive element?

A. magnesium
B. krypton
C. cesium
D. platinum

A

C. cesium

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18
Q

The sum of the currents that enter a junction equals the sum of the currents that leave the junction

A. Coulomb’s law
B. Faraday’s law
C. Kirchoff’s rule
D. Gaussian theory

A

C. Kirchoff’s rule

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19
Q

A pipe has a 2-inch inlet and has a 4-inch oulet, the mass flow ratio of the inlet is ___ to that of the
outlet.

A. less than
B. greater than
C. equal
D. not equal

A

C. equal

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20
Q

The weight of the flow per unit area of cross section perpendicular to the direction of flow is called

A. mass flow rate
B. mean mass velocity
C. volumetric flow rate
D. molal flux

A

B. mean mass velocity

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21
Q

When a fluid flows through a reducer in a piping system, the velocity at the outlet end is ___ the velocity
of the inlet.
A. less than
B. more than
C. the same as
D. one half

A

B. more than

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22
Q

Find the mass flow rate of a liquid (density of 0.690 g/cm³) flowing through a 5 cm (inside diameter) at
8.3 m/s.

A. 69 kg/s
B. 450 kg/s
C. 11.24 kg/s
D. 430 kg/s

A

C. 11.24 kg/s

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23
Q

A water flows out of a pipe at the rate of 3 cm³/s. What is the velocity of the water at a point in the pipe
where the diameter is 0.50?

A. 14.42 cm/s
B. 16.3 cm/s
C. 15.27 cm/s
D. 19.7 cm/s

A

C. 15.27 cm/s

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24
Q

A hose shoots water straight up for a distance of 2.5 m. The end opening on the hose has an area of
0.75 cm². How much water come out in 1 hour?
A. 1.67 m³
B. 1.89 m³
C. 0.78 m³
D. 2.56 m³

A

B. 1.89 m³

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25
Q

A 70.874 L/s (150 ft³/min) of water is flowing in a round pipe such that the flow remains laminar.
Considering that the critical Reynold’s number to be 2000, what is the diameter of the pipe necessary to
ensure laminar flow? (Note : kinematic viscosity of water is 4.75E-5 ft²/s)

A. 33.50 ft
B. 41.70 ft
C. 12.50 ft
D. 37.50 ft

A

A. 33.50 ft

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26
Q

Water at 80 °F flows at 10 feet per second through a 6-inch Sch 40 steel pipe with length of 1000 ft.
The Reynold’s number is

A. 334000
B. 5x10^5
C. 255000
D. 30000

A

B. 5x10^5

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27
Q

A typical self-service gasoline pump puts 15 gal of fuel into our tank in 2 min. The inside diameter of the
nozzle is 1.0 in. What is the volumetric flow rate in m³/s?
A. 0.0047
B. 0.00047
C. 0.000047
D. 0.047

A

B. 0.00047

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28
Q

A typical self-service gasoline pump puts 15 gal of fuel into our tank in 2 min. The inside diameter of the
nozzle is 1.0 in. What is the mass flow rate in kg/s? Specific gravity of the fuel is 0.719

A. 0.34
B. 0.42
C. 0.48
D. 0.55

A

A. 0.34

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29
Q

A typical self-service gasoline pump puts 15 gal of fuel into our tank in 2 min. The inside diameter of the
nozzle is 1.0 in. What is the average velocity in m/s?

A. 0.93
B. 1.44
C. 1.92
D. 2.04

A

A. 0.93

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30
Q

Water at 100ºF is flowing through a straight 4-in schedule 40 pipe at a rate of 1 gal/min. The length of
the pipe is 10 feet, find the velocity at the center of the pipe in feet per second.
A. 0.0378
B. 0.0504
C. 0.0454
D. 0.0252

A

B. 0.0504

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31
Q

One fourth gram of an unknown nonvolatile solute was dissolved in 40 g of CCl4. the solution was
found to boil at 77.2°C. What is the molecular weight of the unknown solute? Kb=5.02 TbCCl4 = 76.8°C

A. 56.1
B. 65.0
C. 78.3
D. 82.1

A

C. 78.3

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32
Q

The muzzle velocity of a projectile is 1500 fps and the distance of the target is 10 miles. The angle of
elevation of the gun must be:

A. 21˚59’
B. 22˚41’
C. 24˚33’
D. 25˚18’

A

C. 24˚33’

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33
Q

A boy wishes to throw a ball over a flat roofed school house that stands 12 m wide and 7.5 m high on
level ground. Assuming that the ball will leave his hand at a height of 1.5 m above the ground,
determine how far from the wall he should take his stand in order to make the ball clear the roof with
least effort, that is, with minimum initial velocity.

A. 4.4 m
B. 2.1 m
C. 7.4 m
D. 8.1 m

A

A. 4.4 m

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34
Q

A projectile leaves a velocity of 50 m/s at an angle of 30˚ with the horizontal. Find the maximum height
that it could reach.
A. 31.86 m
B. 31.28 m
C. 30.63 m
D. 30.12 m

A

A. 31.86 m

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35
Q

A ball is thrown from a tower 30 m high above the ground with a velocity of 300 m/s directed at 20˚ from
the horizontal. How long will the ball hit the ground?

A. 21.2 s
B. 22.2 s
C. 23.2 s
D. 24.2

A

A. 21.2 s

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36
Q

A clock runs fast, gaining 20 minutes each hour. If the clock is set to the correct time at 8 am, what will
the correct time be when the clock next shows 8 o’clock?

A. 4 pm
B. 5 pm
C. 12 midnight
D. 2 am

A

A. 4 pm

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37
Q

It refers to waste or scrap glass, usually ground.
A. cullet
B. fluorospar
B. feldspar
D. glass float

A

A. cullet

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38
Q

Property of a fluid to form droplets and assume the shape of a sphere and rise in a capillary tube.

A. surface tension
B. abrasion
C. condensate
D. vapor pressure

A

A. surface tension

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39
Q

Which plot is linear for a first order reaction?
A. log [A] vs t
B. 1/[A] vs t
C. [A] vs t
D. [A]² vs t

A

A. log [A] vs t

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40
Q

For the reaction 2NO(g) + O2(g) = 2NO2(g) ∆H = -14 kcal. Which of the following will cause the
formation of more products?
A. decreasing the pressure
C. addition of oxygen
B. increasing the temperature
D. addition of catalyst

A

C. addition of oxygen

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41
Q

Which of the following is most likely to increase the rate of a reaction?
A. decreasing the temperature
B. increasing the volume of the reaction vessel
C. reducing the activation energy
D. decreasing the concentration of the reactant in the reaction vessel

A

C. reducing the activation energy

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42
Q

Name the amino acid with the given formula NHOCCH2CH(NH2)COOH.
A. lysine
B. glutamine
C. asparagine
D. arginine

A

C. asparagine

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43
Q

Which of the following amino acid is basic?
A. lysine
B. aspartic acid
C.tyrosine
D. alanine

A

A. lysine

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44
Q

Which of the following amino acid is polar?
A. glutamine
B. arginine
C. Proline
D. Valine

A

A. glutamine

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45
Q

Which of the following amino acid is nonpolar?
A. glutamic acid
B. leucine
C. cysteine
D. serine

A

B. leucine

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46
Q

When a real gas approaches an ideal gas, compressibility factor approaches

A. 0
B. infinity
C. 1
D. above zero

A

C. 1

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47
Q

The reaction A + B + C → R + S has
rate = k ABC/r , find the order of reaction.
A. 0
B. 2
C. 1
D. 3

A

B. 2

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48
Q

A leak from a faucet comes out in separate drops. Which of the following is the main cause of this
phenomenon?
A. gravity
B. viscosity
C. air resistance
D. surface tension

A

D. surface tension

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49
Q

Which of the following is a unit of fugacity?
A. mol/L
B. L-atm/mol
C. bar
D. N/m

A

C. bar

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50
Q

A catalyst
A. decreases the energy of activation
B. lowers the entropy of activation
C. increases the equilibrium constant of the reaction
D. increases the time required to attain
equilibrium

A

A. decreases the energy of activation

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51
Q

One ingredient present in all baking powder is
A. sodium citrate
B. sodium betabisulfate
C. sodium bicarbonate
D. potassium tartrate

A

C. sodium bicarbonate

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52
Q

(16-20) Situation - Given the equation x2/144 + y2/25 = 1. Find the

  1. coordinates of the vertices
    A. (12,0) & (12,0)
    B. (-2,0) & (12,0)
    C. (-12,0) & (2,0)
    D. (-12,0)&(12,0)
  2. coordinates of the co-vertices
    A. (0, 5) & (0, -5)
    B. (5, 5) & (0, -5)
    C. (2, 5) & (0, 5)
    D. (2, 5) & (0, -5)
  3. coordinates of the center
    A. (0, 5)
    B.(12, 0)
    C. (0, 0)
    D. (0, -5)
  4. the coordinates of the foci
    A. (-10.91, 0) & (10.91, 0)
    B. (10.91, 0) & (10.91, 1)
    C. (-10.91, 1) & (10.91, 0)
    D. (-9.91, 0) & (7.91, 0)
  5. eccentricity
    A. 0.56
    B. 0.67
    C. 0.77
    D. 0.91
A
  1. D. (-12,0)&(12,0)
  2. A. (0, 5) & (0, -5)
  3. C. (0, 0)
  4. A. (-10.91, 0) & (10.91, 0)
  5. D. 0.91
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53
Q

Air at 1 bar and 25°C enters a compressor at low velocity, discharges at 3 bar, and enters a
nozzle in which it expands to a final velocity of 600 m/s at the initial conditions of pressure and
temperature. If the work of compression is 240 kJ per kilogram of air, how much heat must be
removed during compression?
A. -60 kJ/kg
B. -30 kJ/kg
C. -45 kJ/kg
D. -75 kJ/kg

A

A. -60 kJ/kg

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54
Q

Humid air at temperature 600°F and a total pressure of 1 atmosphere is passed through a dehumidifier
at a rate of 1000 ft³/min. The partial pressure of water vapor in air is reduced from 45 mmHg to 10
mmHg. How many pounds of water is removed per hour?

A. 81.9
B. 45.4
C. 65.4
D. 76.3

A

C. 65.4

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55
Q

23-25. A contact sulfuric acid plant produces 98.0% sulfuric acid, by absorbing SO3 into a 97.3% sulfuric
acid solution. A gas containing 8.00 % SO3 (remainder inerts ) enters the SO3 absorption tower at the
rate of 28 lb mol per hour. 98.5 % of the SO3 is absorbed in this tower. 97.3% sulfuric acid is introduced
into the top of the tower and 95.9% sulfuric acid from another part of the process is used as a make-up
acid. The flow sheet is given in the figure with all of the known data on it. ( Note of the flow diagram :
Liquid solution leaving at the bottom of the tower is split into product and recycle stream which is mixed
with the make-up acid and introduced as feed solution at the top of the tower) Calculate the :

  1. Tons / day of 95.9% H2SO4 make-up acid solution required.
    A. 2260
    B. 2660
    C. 2060
    D. 2460
  2. Tons / day of 97.3% H2SO4 solution introduced into the top of the tower.
    A. 6740
    B. 6470
    C. 6070
    D. 6670
  3. Tons / day of 98% H2SO4 solution produced.
    A. 2120
    B. 2040
    C. 2240
    D. 2420
A
  1. C. 2060
  2. B. 6470
  3. C. 2240
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56
Q

Hydrogen in fuel which needs oxygen from air for its combustion is known as

A. moisture hydrogen
B. net hydrogen
C. total hydrogen
D. combined hydrogen

A

B. net hydrogen

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57
Q

Bauxite is an oxide mineral of

A. Ba
B. Bi
C. B
D. Al

A

D. Al

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58
Q

Which of the following is a synthetic dye?
A. alizarin
B. melanin
C. canotenoid
D. rubber

A

A. alizarin

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58
Q

The process to transform long chain hydrocarbon into small chains.

A. cracking
B. polymerization
C. isomerization
D. fusion

A

A. cracking

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59
Q

Commercially important ore of lead is
A. siderite
B. sphalerite
C. galena
D. haematite

A

C. galena

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60
Q

Brimstone is

A. charcoal
B. sulfur
C. sulfur dioxide
D. form of
diamond

A

B. sulfur

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61
Q

Brass is an alloy of
A. Cu and Zn
B. Fe and C
C. Cu and Sn
D. Fe and Ni

A

A. Cu and Zn

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62
Q

Calcium carbonate is also known as
A. chalk
B. feldspar
C. charcoal
D. silica

A

A. chalk

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63
Q

Butyric acid is found mainly on
A. rancid butter
B. citrus fruits
C. animal fats
D. cellulose

A

A. rancid butter

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64
Q

What is the vapour pressure of benzene at 22 C and 1 atm? What is its melting point and boiling point?
A. 82.7 mmHg, 5.5 C & 80.1C
B. 82.7 mmHg, 2.2 C & 80.1 C
C. 30.5 mmHg, 5.5 C & 56.8 C
D. 30.5 mmHg, 2.2 C & 56.8 C

A

A. 82.7 mmHg, 5.5 C & 80.1C

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65
Q

What is the molecular weight of lindane ? (C6H6Cl26)

A. 175.6
B. 221.7
C. 240.5
D. 290.83

A

D. 290.83

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66
Q

1000 gal/min of water is cascading done a height of 100 ft from a reservoir. If half of the energy
is converted to electrical energy, how many 105 watts bulb can be lighted in 30 seconds?

A. 84
B. 94
C. 86
D. 90

A

D. 90

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67
Q

{13-14}. Drying of solids from 25% to 10% at constant drying conditions with Xc=15% and Xe=5% takes
4.17hrs. A solid is to dry from 30% to 8% with the same drying conditions. Q = 10020 kg

  1. What is the rate of drying in the first period? (Choices in kg/s}
    A. 0.131
    B. 0.253
    C. 0.113
    D. 0.0311
  2. What is the total time? (Choices in hrs)
    A. 6.56
    B. 6.86
    C. 6.65
    D. 6.95
A
  1. C. 0.113
  2. C. 6.65
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68
Q

{15-17} Situation - A liquid with no appreciable elevation of boiling point is concentrated in a multiple-effect
evaporator. The temperature of the steam to the first effect is 395 K and vacuum is applied to the third
effect so that the boiling point is 325 K. The overall heat transfer coefficients may be taken as 3.1, 2.3
and 1.1 kW/sq.m-K in the three effects respectively.

  1. What is the temperature in the first effect?

A. 315.8K
B. 381.5 K
C. 318.5 K
D. 351.8 K

  1. In the second effect?
    A. 336.2 K
    B. 332.6 K
    C. 323.6 K
    D. 363.2 K
  2. In the third effect?
    A. 305.2 K
    B. 352.5 K
    C. 325.0 K
    D. 332.0 K
A
  1. B. 381.5 K
  2. D. 363.2 K
  3. C. 325.0 K
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69
Q

What is the specific gravity of nitrogen at 80 F and 745 mmHg compared to air at 80 F and 745 mmHg?

A. 0.79
B. 0.85
C. 0.92
D. 0.97

A

D. 0.97

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70
Q

The distance between plates is Δy = 0.5 cm, Δv = 10 cm/s and the fluid is ethyl alcohol at 273K having a
viscosity of 1.77 cp. Calculate the shear stress in dyne per square centimeter.

A. 0.210
B. 0.354
C. 0.540
D. 0.720

A

B. 0.354

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71
Q

20-22 A right circular conical tank has radius of 6 inches across the top and a height of 2 ft and contains water with a height of 12 inches. If water flows out from the bottom of the tank at a constant rate 2 in3 / min;

  1. find the dh/dt in in/min at the instant that the height is 12 inches.
    A. -2/7π
    B. -2/9π
    C. 2/7π
    D. 2/9π
  2. find the volume of water in the tank in in3 when the height of water is 12 inches?
    A. 24π
    B. 30π
    C. 36π
    D. 40π
  3. find the volume of water in the tank in in3 when the height of water is 6 inches?
    A. π/2
    B. 3π/2
    C. 7π/2
    D. 9π/2
A
  1. B. -2/9π
  2. C. 36π
  3. D. 9π/2
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72
Q

An insulated, electrically heated hot-water heater contains 190 kg of liquid water at 60°C when a power outage occurs. If water is withdrawn from the heater at a steady rate of m=0.2 kg/s, how long will it take for the temperature of the water in the tank to drop from 60 to 35°C? Assume that cold water enters the tank at 10°C, and that heat losses from the tank are negligible. Water may be considered an incompressible liquid.

A. 400.8 s
B. 658.5 s
C. 521.4 s
D. 844.3 s

A

B. 658.5 s

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73
Q

The azimuthal or secondary quantum number is related to the

A. direction of turning
B. orientation in space
C. shape of the electron cloud
D. distance from the nucleus

A

C. shape of the electron cloud

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74
Q

The magnetic quantum number is related to the
A. direction of turning
B. orientation in space
C. shape of the electron cloud
D. distance from the nucleus

A

B. orientation in space

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75
Q

The radius of a sphere is r cm at a time t in seconds. Find the radius when the rates of increase of the surface area and the radius are numerically equal.

A. 3Л/8 cm
B. 1/8Л cm
C. 2/(3Л) cm
D. 3Л/4 cm

A

B. 1/8Л cm

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76
Q

A solution is passing through a conical filter 24cm deep and 16 cm across the top into a cylindrical vessel at diameter 12 cm. At what rate is the level of the solution in the cylindrical rising when the depth of the solution in the filter is 12 cm? Its level is falling at the rate of one cm/sec.

A. 0.555 cm/sec
B. 0.777 cm/sec
C. 0.444 cm/sec
D. 0.333 cm/sec

A

C. 0.444 cm/sec

77
Q

The surface area of the sphere (initially zero) increases uniformly at the rate of 26 cm²/s. Find the rate at which the radius is increasing after 2 seconds.

A. 0.509 cm/s
B. 0.506 cm/s
C. 0.505 cm/s
D. 0.504 cm/s

A

A. 0.509 cm/s

78
Q

The limiting reactant in a reaction
A. has the lowest coefficient in a balanced equation
B. is the reactant for which you have the fewest number of moles
C. has the lowest ratio of moles available / coefficient in the balanced equation
D. has the lowest ratio of coefficient in the balanced equation/moles available

A

C. has the lowest ratio of moles available / coefficient in the balanced equation

79
Q

The number of cubic feet of a gas composed of 28% CO and 72% N2 (by volume) and measured at
85°F and 100 psig required to reduce 1 ton of ore which is 84% Fe3O4 to metallic iron is:
Fe3O4 + CO → 3FeO + CO2 and FeO + CO → Fe + CO2

A. 4,975.3
B. 5,060.3
C. 5,145.1
D. 5,230.0

A

D. 5,230.0

80
Q

The CO2 that will theoretically be formed when a mixture of 50 g of CH4 and 100 g of O2 is ignited?
A. 34.4 g
B. 68.8 g
C. 103.1 g
D. 137.5 g

81
Q

A particle rotates counterclockwise according to the law θ = t³/(50-t) where θ is in radians and t in
seconds. Calculate the angular velocity at the end of 10 seconds in radians per second.
A. 5.72
B. 8.12
C. 10.18
D. 6.35

82
Q

A motor takes 6 s to go from 150 to 50 rad/s at constant angular acceleration. The total angle through which the motor’s shaft turned during the acceleration is

A. 300 rad
B. 600 rad
C. 1200 rad
D. 3600 rad

A

B. 600 rad

83
Q

A string 0.5 m long is used to whirl a 1-kg stone in a vertical circle at a uniform velocity of 5 m/s. What is the tension in the string when the stone is at the bottom of the circle?

A. 9.8 N
B. 40.2 N
C. 50 N
D. 59.8 N

84
Q

A train starting at initial velocity of 30 kph travels a distance of 21 km in 18 minutes. Determine the acceleration of the train in m/s2 at this instant.
A. 0.0043
B. 0.0206
C. 0.0865
D. 0.3820

85
Q

A car starts from rest and moves with a constant acceleration of 6 m/sec2. What is the speed in 4
seconds?
A. 18 m/s
B. 24 m/s
C. 35 m/s
D. 55 m/s

86
Q

An automobile starting from rest at t=o is in constant acceleration on a straight line. It is observed to pass two marks separated by 50 m, the first at t = 8 s and the second at t = 10 s. What is the value of the acceleration in m/s²?

A. 4.6
B. 1.2
C. 3.4
D. 2.8

87
Q

A piece of property is purchased for P10,000 and yields P1,000 yearly profit. If the property is sold after
five years, the minimum price to breakeven, with interest at 6%, is closest to

A. P5,000
B. P6,500
C. P7,700
D. P8,300

88
Q

The annual maintenance cost of a machine shop is p 69,994. If the cost of making a forging is P 56 per unit and its selling price is P 135 per forged unit, find the number of units to be forged to break-even.

A. 886 units
B. 885 units
C. 688 units
D. 668 units

A

A. 886 units

89
Q

Hydrogen peroxide solution for hair bleaching is usually prepared by mixing 5 g of hydrogen peroxide per 100 mL solution. What is the molarity of this solution?

A. 1.0 M
B. 1.95 M
C. 1.5 M
D. 1.8 M

90
Q

Given that the density of a solution of 5 g of toluene and 225 g of benzene is 0.876 g/mL. Calculate the molarity of the solution.
A. 0.21 M
B. 0.25 M
C. 0.28 M
D. 0.31 M

91
Q

A feed of 4535 kg/h of a 2.0 wt % salt solution at 311 K enters continuously a single-effect evaporator and is being concentrated to 3.0%. The evaporation is at atmospheric pressure and the area of the evaporator is 69.7 m². Saturated steam at 383.2 K is supplied for heating. Since the solution is dilute, it
can be assumed to have the same boiling point as water. The heat capacity of the feed can be taken as
Cp = 4.10 kJ/kg-K. Calculate the overall heat-transfer coefficient U in W/m²-K.

A. 1762
B. 1790
C. 1823
D. 1941

92
Q

A colloidal solution is to be concentrated from 15 to 65% solids. The specific heat of the feed, entering at 50 deg F is 0.93. The pressure of the saturated steam to the evaporator is 10 psia; the condenser pressure is 5-in. Hg abs. The steam chest has an overall heat transfer coefficient of 200 Btu/hr-sq.ft.-degF. Water must be evaporated at the rate of 35,000 lb/hr. Neglecting boiling point elevation, what is
the steam consumption [lb/hr]?

A. 10500
B. 35000
C. 40130
D. 45500

93
Q

In evaporation operation, the valuable product is called

A. thick liquor
B. vapor
C. water
D. residue

A

A. thick liquor

94
Q

When the pressure of the evaporator chamber is decrease, the boiling point of the solution inside the chamber will

A. increase
B. remain the same
C. decrease
D. none of these

A

C. decrease

95
Q

If 23 m³ of water are poured into a conical vessel, it reaches a depth of 12 cm. How much additional water must be added so that the depth reaches 18 cm?

A. 95 m³
B. 77 m³
C. 54.6 m³
D. 108 m³

A

C. 54.6 m³

96
Q

The lateral area of a right circular cone of radius 4-cm is 100.53 sq.cm. Determine the slant height.

A. 8 cm
B. 6 cm
C. 9 cm
D. 10 cm

97
Q

A glass bowl in the shape of a sphere having a radius of 4 cm is filled with water to a depth of 3 cm. If the water flows out through a small hole in the bottom so that the level drops 2 cm, how much water has escaped?

A. 73.3 cm³
B. 65.4 cm³
C. 55.4 cm³
D. 44.8 cm³

A

A. 73.3 cm³

98
Q

A cubical container that measures 2” on a side is tightly packed with 8 marbles and is filled with water. All 8 marbles are in contact with the walls of the container and the adjacent marbles. All of the marbles are the same size. What is the volume of water in the container?

A. 0.38 in³
B. 2.5 in³
C. 3.8 in³
D. 4.2 in³

A

C. 3.8 in³

99
Q

A solid metal sphere of radius 32 cm is melted and recast to make 64 identical small spheres. What will
be the radius of each small sphere?

A. 1/2 cm
B. 1 cm
C. 2 cm
D. 4 cm

100
Q

In the story about the crow that wanted to drink water from a cylindrical can but could not reach the water, it is said that the crow dropped a pebble which was a perfect sphere 3 cm in radius into the can. If the can was 6 cm radius, what was the rise in water level inside the can after that pebble was
dropped?

A. 2 cm
B. 1 cm
C. 3 cm
D. 2.5 cm

101
Q

A squeezable toothpaste tube is originally in the form of a cylinder 12 cm long, with diameter 4 cm. The short cylindrical nozzle has diameter 5 mm. What length of toothpaste can the tube produce?
A. 9.6 cm B. 12 cm C. 16 cm D. 768 cm

102
Q

When the pressure of the heating steam in an evaporator is increased, the steam consumption for a given duty and heat transfer area will
A. increase
B. remains the same
C. decrease
D. none of these

A

C. decrease

103
Q

It is a method of feeding in evaporation where the dilute liquid enters an intermediate effect, flows in forward feed to the end of the series, and is then pumped back to the first effects for final concentration.

A. forward feed
B. backward feed
C. mixed feed
D. parallel feed

A

C. mixed feed

104
Q

The total capacity of 4 effect evaporator is ____ that of a single effect evaporator with the same heating surface equal to that of one of the effects when operated under the same terminal conditions.

A. twice
B. equal to
C. 4 times
D. 1/4

A

B. equal to

105
Q

The locus of a point that moves so that its distance from a fixed point and a fixed line is always equal
is known as

A. a parábola
B. a circle
C. a hyperbola
D. an ellipse

A

A. a parábola

106
Q

A set of points in a plane, the sum of whose distances from two fixed points is a constant.

A. circle
B. hyperbola
C. parabola
D. ellipse

A

D. ellipse

107
Q

P1V1/T1 = P2V2/T2 is
A. Charles law
B. Ideal gas law
C. Combined Boyle’s & Charles law
D. Amagat’s law

A

C. Combined Boyle’s & Charles law

108
Q

Which of the following does not belong to the group?

A. B
B. As
C. Mg
D. Si

109
Q

H+ is a/an ____.

A. proton
B. electron
C. element
D. neutron

110
Q

Hydrocarbons that contain one or more carbon triple bonds.
A. alkynes
B. alkenes
C. alkyl
D. alkanes

A

A. alkynes

111
Q

How many atoms are there in a molecule of sucrose?
A. 12
B. 11
C. 22
D. 45

112
Q

A valve that controls flow by means of a disk or wedge-shaped dam sliding at right angles to the direction of flow and seating tightly in the valve body is a

A. gate valve
B. globe valve
C. butterfly valve
D. orifice

A

A. gate valve

113
Q

The equation that relates friction factor and Reynold’s number f=64/Re, holds to
A. smooth pipes
C. laminar and turbulent flow
B. turbulent flow only
D. laminar flow only

A

D. laminar flow only

114
Q

The pressure drop in a rotameter is _____.
A. variable
B. zero
C. not measurable
D. constant

A

D. constant

115
Q

The differential height between two points through which a fluid has to be transported is the

A. pressure head
B. dynamic head
C. velocity head
D. potential head

A

D. potential head

116
Q

Given the initial condition dy/dx = -6xy2 ; y(0) = 1.
12. What is the general solution?
A. y-1 = 3x2 +C
B. y = 2x3 + C
C. y-1 = 4x2-2x+C
D. y = 2x2-x+C

  1. What is the particular solution?
    A. y-1 = 3x2 +1
    B. y = 2x3 + 3
    C. y-1 = 4x2-2x+1
    D. y = 2x2-x+3
A
  1. A. y-1 = 3x2 +C
  2. A. y-1 = 3x2 +1
117
Q

Find the volume of the biggest cylinder inscribe by a cone of diameter 12 m and height of 12 m.

A. 64π m3
B. 32π m3
C. 16π m3
D. 75π m3

A

A. 64π m3

118
Q

Alpha Centauri is the nearest star on Earth, with a distance of 4.2 lightyears. How far is it from
Earth in meters?
A. 3.97 E 14
B. 3.97 E 16
C. 3.97 E 15
D. 3.47 E 17

A

B. 3.97 E 16

119
Q

The speed of light I 3 E 8 m/s. How long will it take the light to travel a distance of 40000 miles?
A. 0.18 s
B. 0.25 s
C. 0.14 s
D. 0.21 s

120
Q

Common microorganism used for penicillin manufacture is
A. mold
B. bacteria
C. protozoa
D. algae

121
Q

An example of water soluble is
A. vitamin C
B. vitamin A
C. vitamin E
D. vitamin K

A

A. vitamin C

122
Q

Ionic solids
A. are hard materials of low melting point
B. are hard materials of high melting point
C. are soft materials of low melting point
D. are soft materials of high melting point

A

B. are hard materials of high melting point

123
Q

Process of breaking down a large isotope into smaller isotopes.
A. nuclear fission
B. beta particle emission
C. nuclear fusion
D. gamma ray emission

A

A. nuclear fission

124
Q

Which of the following is a homogeneous mixture?
I. water II. water and alcohol III. Air
A. I, II and III
B. II and III only
C. I and II only
D. I and III only

A

B. II and III only

125
Q

NH3 is
A. trigonal planar
B. tetrahedral
C. linear
D. trigonal pyramid

A

D. trigonal pyramid

126
Q

Water is a ________ molecule.
A. diatomic
B. triatomic
C. monoatomic
D. tetra-atomic

A

B. triatomic

127
Q

Gasoline does not dissolve in water because it contains
A. alkenes
B. alkynes
C. alkanes
D. aromatic carbon

A

C. alkanes

128
Q

The melting point and boiling point of halogens

A. increases with increasing atomic number
B. decreases with increasing mass number
C. increases with increasing mass number
D. decreases with increasing mass number

A

C. increases with increasing mass number

129
Q

With regards to corrosion of metals, passivation is the process that
A. intensifies deterioration
B. intensifies deterioration temporarily
C. changes the composition of the metal
D. inhibits further deterioration

A

D. inhibits further deterioration

130
Q

Which of the following has compounds which are more often colored?

A. alkali metals
B. halogens
C. alkaline earth metals
D. transition metals

A

D. transition metals

131
Q

When growth of microorganism is inhibited by the presence of another, it is known as

A. commensalism
B. neutralism
C. parasitism
D. mutualism

A

C. parasitism

132
Q

Which number gives the identity of an element ?

A. electron
B. positron
C. proton
D. neutron

133
Q

Which of the following metals has the highest specific heat capacity at 100˚C?

A. aluminum
B. bismuth
C. copper
D. iron

A

A. aluminum

134
Q

Which of the following has the lowest boiling point?

A. H2O
B. H2Te
C. H2S
D. H2Se

135
Q

The change in direction of a light ray due to change in speed is

A. diffraction
B. reflection
C. refraction*
D. rarefraction

A

C. refraction

136
Q

The chemical most commonly used to speed up sedimentation of sewage is

A. sulfuric acid
B. lime
C. copper sulfate
D. methylene blue

137
Q

A plant cell differs from an animal cell because it has

A. nucleus
B. vacuoles
C. cellulose cell wall
D. definite shape

A

C. cellulose cell wall

138
Q

The concentration of carbon dioxide in water at 20ºC is 1.0 E-5 M. The Henry’s constant for carbondioxide dissolution in water is 3.91 E -2 M/atm. What is the partial pressure of CO2 in the air?
A. 2.56 E -5 atm
B. 2.56 E -4 atm
C. 3.75 E -5 atm
D. 3.75 E -5 atm

A

B. 2.56 E -4 atm

139
Q

At a certain temperature the equilibrium mixture of the reaction PCl5(g) = PCl3(g) + Cl2(g) has partial pressures of 1.5 atm, 0.10 atm and 7.50 atm for PCl5, PCl3 and Cl2, respectively. Calculate the value of Kp at this temperature.
A. 0.50 atm
B. 2.0 atm
C. 1.3 atm
D. 0.77 atm

A

A. 0.50 atm

140
Q

The compressibility factor for every gas as its pressure approaches zero is
A. 0
B. 2
C. -1
D. 1

141
Q

Oxygen diffuses at 30.5 ml/min, what is the compound that diffuses 31.5 ml/min at the same conditions?

A. NO
B. CO
C. NO2
D. CO2

142
Q

What is the volume of one molecule of CO2 at STP?

A. 1.04 E -20 L
B. 2.01 E -16 L
C. 0.00065 L
D. 3.72E -23 L

A

D. 3.72E -23 L

143
Q

Molecular motion in a gas stops
A. at absolute zero
B. when the gas becomes a liquid
C. when the gas becomes a solid
D. when the pressure on it exceeds a certain value

A

A. at absolute zero

144
Q

Falling drops of water become spherical due to

A. surface tension
B. viscosity
C. compressibility
D. capillarity

A

A. surface tension

144
Q

Which pollutant contributes significantly to the formation of acid rain?

A. SO2
B. CO
C. NH3
D. hydrocarbons

145
Q

Another instrument besides a Geiger counter that is useful in detecting radiations is the

A. dosimeter
B. anemometer
C. calorimeter
D. chomatograph

A

A. dosimeter

146
Q

When a solid has a crystalline structure, the atoms arranged in repeating structure called ____.
A. lattice
B. crystal
C. unit cell
D. domain

A

C. unit cell

147
Q

The distinct pattern in space which the atoms of metal arranged themselves when they combine to produce a substance of recognizable size?

A. space lattice
B. crystal
C. grain
D. unit cell

A

A. space lattice

148
Q

18 karat gold contains ___ % gold.
A. 18
B. 25
C. 89
D. 75

149
Q

The curie is a measure of the
A. number of disintegrations per second of a radioactive substance
B. number of alpha particles emitted by exactly 1 g of a radioactive substance
C. total energy absorbed by an object exposed to a radioactive source
D. lethal threshold for radiation exposure

A

A. number of disintegrations per second of a radioactive substance

150
Q

When CO2 is bubbled through water, what compound forms?
A. H2CO2
B. H2CO3
C. H2CO
D. CO

151
Q

Synthetic oil of wintergreen contains
A. ethyl salicylate
B. methyl salicylate
C. benzyl acetate
D. linalyl acetate

A

B. methyl salicylate

152
Q

How many electrons are there in a helium atom?
A. 1
B. 4
C. 2
D. 6

153
Q

A functional group in which an oxygen is double bonded with carbon is
A. carbonyl
B. carboxylic acid
C. hydroxyl
D. thio

A

A. carbonyl

154
Q

Which of the following substances is always produced when an active metal reacts with water?
A. CO2
B. H2
C. NaOH
D. H2O

155
Q

It is an enzyme represented with a sigmoidal curve.
A. allosteric enzymes
B. isoenzymes
C. endoenzymes
D. exoenzymes

A

A. allosteric enzymes

156
Q

The larger the numerical value of the bond energy, the ______.
A. stronger the bond*
C. weaker the bond
B. no relation to bond strength
D. none of these

A

A. stronger the bond

157
Q
  1. A horizontal cylinder, closed at both ends, is divided in half by a free piston. The cylinder neither absorbs nor conducts heat, and the piston is perfectly lubricated in the cylinder. The left half of the cylinder contains 1 kmol of an ideal gas at 200 kPa and 15 C. The gas has constant heat capacities, with Cv=5R/2. The right half of the cylinder is evacuated and the piston is temporarily restrained by latches. The following operations are carried out: (1) the latches are removed, allowing the gas on the left to expand as it pushed the piston to the right-hand end of the cylinder; (2) a small rod is inserted through the right hand end of the cylinder and exerts a force on the piston, pushing it slowly back to its initial position. What is the gas temperature (in C) after process 1 once internal equilibrium is established?

A. 15
B. 25
C. 5
D. 32

  1. From the data in #55, what is the gas temperature (in C)at the end of process 2, assuming this process to be reversible and adiabatic?

A. 42.42
B. 65.88
C. 91.12
D. 107.07

  1. From the data in #55 &56, what is the gas pressure (in kPa) at the end of process 2?

A. 145.7
B. 210.7
C. 263.9
D. 298.4

  1. From the data in #55 & 56, what is work for process 2 in kJ?

A. -1914
B. -1734
C. -1422
D. 975

  1. From the data in #55 & 56, what is the entropy change for the combined process 1 and 2 in kJ/K?
    A. 5.763
    B. 4.312
    C. 3.076
    D. 2.415
A
  1. A. 15
  2. D. 107.07
  3. C. 263.9
  4. A. -1914
  5. A. 5.763
158
Q

Calculate the bubble point of a liquid system containing 80 mol % ethanol and 20 mol % water at 500
mmHg.

A. 57.1 C
B. 68.3 C
C. 79.1 C
D. 87.4 C

159
Q

The 20 amino acids found in proteins differ from each other in their

A. amino group
B. side chain
C. carboxylic acid group
D. alpha carbon

A

B. side chain

160
Q

Which acid is found in vinegar?

A. formic acid
B. propionic acid
C. nitric acid
D. acetic acid

A

D. acetic acid

161
Q

Wood alcohol is
A. methanol
B. grain alcohol
C. ethanol
D. 2-propanol

A

A. methanol

162
Q

Which of the following will evaporate easily in a dry cloth?
A. water
B. acetone
C. diethyl ether
D. oil

A

C. diethyl ether

163
Q

200 ppm is equivalent to ____ mg/L.
A. 0.2
B. 20
C. 200
D. 100

164
Q

Which isotope is particularly useful for both diagnostic and therapeutic work with the thyroid
gland?
A. cobalt-60
B. technetium-99 m
C. iodine-131
D. tritium

A

C. iodine-131

165
Q

Plasticizers are
A. polymers that have elastic properties
B. polymers that soften on heating
C. molecules that confer pliability on otherwise brittle polymers
D. extremely toxic

A

C. molecules that confer pliability on otherwise brittle polymers

166
Q

How many atoms are there in a molecule of naphthalene?

A. 10
B. 20
C. 18
D. 24

167
Q

Primary alcohol can be derived from the reaction of Grignard reagent with?
A. methanal
B. any ketone
C. acetone
D. ethylene

A

A. methanal

168
Q

In an aldehyde containing substance, under Tollen’s test, what would be the expected result to confirm
its positivity.
A. brown precipitate
B. silver mirror
C. fishy odor
D. white precipitate

A

B. silver mirror

168
Q

It is the act regulating the practice of chemical engineering in the Philippines.
A. RA 9297 *
B. RA 9792
C. RA 9729
D. RA 9279

A

A. RA 9297

168
Q

Hybrid orbitals in alkynes.
A. sp³
B. sp
C. sp²
D. spd

169
Q

How many atoms does Freon have?
A. 1
B. 5
C. 3
D. 6

170
Q

It is used to expressed specific gravity of petroleum products.
A. degrees Baume
B. degrees twadell
C. degreees API
D. brix scale

A

C. degreees API

171
Q

How many electrons passed through the cathode ray tubes in 40 seconds using 30 microampere
current?
A. 7.5 E 12
B. 7.5 E 15
C. 1.7 E 16
D. 1.7 E 14

A

B. 7.5 E 15

172
Q

The following equilibrium was obtained when some NO gas was placed into a 2-L container until the
pressure was 0.65 atm : 2NO(g) = N2(g) + O2(g). The equilibrium pressure of N2 was found to be 5.25 E
-2 atm. What is the Kp for this reaction?
A. 198
B. 6.52 E -3
C. 153
D. 9.28 E -3

A

D. 9.28 E -3

173
Q

The speed of sound is 344 m/s, if the lag time between lightning and the sound of the thunder is 4 s
then how far away is the thunderstorm?
A. 1376 m
B. 1755 m
C. 1955 m
D. 2310 m

174
Q

An unbiased coin is tossed 6 times. What is the probability of getting exactly 3 heads?
A. 3/16
B. 5/16
C. 11/16
D. 1/16

175
Q

Two fair dice are thrown. Find the probability of getting a total of 9

A. 1/9
B. 2/7
C. 1/7
D. 2/9

176
Q

Two fair dice are thrown. Find the probability of getting at most a total of 6
A. 5/12
B. 1/5
C. 1/9
D. 2/3

177
Q

Two fair dice are thrown. Find the probability of getting a total of 3.
A. 1/32
B. 1/18
C. 1/9
D. 2/15

178
Q

To what height must a man be raised above the earth in order to see one-fourth of its surface?
Assume radius of earth as R.
A. 2R
B. 1.41R
C. R
D. 0.86R

179
Q

A 500 g ball is whirled in a vertical circle at the end of a string 60 cm long. If the velocity of the ball at
the bottom of the circle is 4 m/s, what is the tension of the spring at that part?
A. 13.3 N
B. 18.4 N
C. 8.2 N
D. 4.9 N

180
Q

A 300 g ball at rest is struck with a bat with a force of 150 N. If the bat was in contact with the ball for
0.02 sec, the balls velocity is
A. 0.01 m/s
B. 0.1 m/s
C. 2.5 m/s
D. 10 m/s

181
Q

A 40 kg mass is dragged along the surface of a table by means of a cord, which passes over a
frictionless pulley at the edge of the table and is attached to a 12 kg mass. If the coefficient of friction
between the 40 kg mass and the table is 0.15, determine the tension on the cord.
A. 74 N
B. 84 N
C. 94 N
D. 104 N

183
Q

A body takes twice as long to slide down a plane 30º to the horizontal as it would if the plane were
smooth. What is the coefficient of friction?
A. 0.433
B. 0.242
C. 0.112
D. 0.077

184
Q

Two blocks A and B are released from rest on a 30º inclined plane when they are 39.20 m apart.
Each block has the same weight. The coefficient of friction under block A is 0.20 and that of B is
0.40. Compute the elapsed time until the block touch each other.
A. 2.45 s
B. 6.81 s
C. 10.4 s
D. 14.1 s

186
Q

A block passes a point 4 m from the edge of a table with a velocity of 5 m/s. It slides off the edge of
the table which is 5 m high and strikes the floor 3 m from the edge of the table. What was the
coefficient of friction between the block and the table?
A. 0.12
B. 0.21
C. 0.33
D. 0.47

186
Q

Five hundred kilograms per hour of steam drives a turbine. The steam enters the turbine at 44 atm
and 450C at a linear velocity of 60 m/s and leaves at a point 5 m below the turbine inlet at atmospheric
pressure and a velocity of 360 m/s. The turbine delivers shaft work at a rate of 70 kW and the heat loss
from the turbine is estimated to be 104
kcal/h. Calculate the specific enthalpy change associated with
the process.
A. -650 kJ/kg
B. -600 kJ/kg
C. -550 kJ/kg
D. -500 kJ/kg

A

A. -650 kJ/kg

Letchaysaybeejen (10 decks)

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