Refresher Exam Part 2 Flashcards
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
B. hyperbola
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
D. a sinusoid
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
C. patent
The highest ordinate on the stress-strain curve.
A. ultimate strength
B. yield strength
C. rupture point
D. proportional limit
A. ultimate strength
Which does not belong to the group?
A. microjoule
B. watts
C. kilowatt-hour
D. ergs
B. watts
What is the molecular weight of sucrose?
A. 180
B. 240
C. 300
D. 342
D. 342
Who coined the term serendipity?
A. Horace Walpole
B. Archimedes
C. Wilhelm Roentgen
D. Neils Bohr
A. Horace Walpole
Who discovered radioactivity?
A. Henri Becquerel
B. Piere& Marie Curie
C. Wilhelm Roentgen
D. Neils Bohr
A. Henri Becquerel
Which control system is used for multi-input, multi-output system?
A. cascade control
B. feedforward control
C. feedbackward control
D. model predictive control
D. model predictive control
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
C. cascade control
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. 2.57 m
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
D. 1666.67 N
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
C. 392 kPa
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 0.713 kg/s; 3 MW
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
C. 3.7
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. 44.58
The second is the duration of radiation of what radioactive element?
A. magnesium
B. krypton
C. cesium
D. platinum
C. cesium
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
C. Kirchoff’s rule
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
C. equal
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
B. mean mass velocity
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
B. more than
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
C. 11.24 kg/s
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
C. 15.27 cm/s
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
B. 1.89 m³
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. 33.50 ft
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
B. 5x10^5
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
B. 0.00047
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. 0.34
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. 0.93
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
B. 0.0504
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
C. 78.3
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’
C. 24˚33’
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. 4.4 m
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. 31.86 m
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. 21.2 s
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. 4 pm
It refers to waste or scrap glass, usually ground.
A. cullet
B. fluorospar
B. feldspar
D. glass float
A. cullet
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. surface tension
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. log [A] vs t
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
C. addition of oxygen
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
C. reducing the activation energy
Name the amino acid with the given formula NHOCCH2CH(NH2)COOH.
A. lysine
B. glutamine
C. asparagine
D. arginine
C. asparagine
Which of the following amino acid is basic?
A. lysine
B. aspartic acid
C.tyrosine
D. alanine
A. lysine
Which of the following amino acid is polar?
A. glutamine
B. arginine
C. Proline
D. Valine
A. glutamine
Which of the following amino acid is nonpolar?
A. glutamic acid
B. leucine
C. cysteine
D. serine
B. leucine
When a real gas approaches an ideal gas, compressibility factor approaches
A. 0
B. infinity
C. 1
D. above zero
C. 1
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
B. 2
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
D. surface tension
Which of the following is a unit of fugacity?
A. mol/L
B. L-atm/mol
C. bar
D. N/m
C. bar
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. decreases the energy of activation
One ingredient present in all baking powder is
A. sodium citrate
B. sodium betabisulfate
C. sodium bicarbonate
D. potassium tartrate
C. sodium bicarbonate
(16-20) Situation - Given the equation x2/144 + y2/25 = 1. Find the
- coordinates of the vertices
A. (12,0) & (12,0)
B. (-2,0) & (12,0)
C. (-12,0) & (2,0)
D. (-12,0)&(12,0) - 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) - coordinates of the center
A. (0, 5)
B.(12, 0)
C. (0, 0)
D. (0, -5) - 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) - eccentricity
A. 0.56
B. 0.67
C. 0.77
D. 0.91
- D. (-12,0)&(12,0)
- A. (0, 5) & (0, -5)
- C. (0, 0)
- A. (-10.91, 0) & (10.91, 0)
- D. 0.91
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. -60 kJ/kg
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
C. 65.4
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 :
- Tons / day of 95.9% H2SO4 make-up acid solution required.
A. 2260
B. 2660
C. 2060
D. 2460 - Tons / day of 97.3% H2SO4 solution introduced into the top of the tower.
A. 6740
B. 6470
C. 6070
D. 6670 - Tons / day of 98% H2SO4 solution produced.
A. 2120
B. 2040
C. 2240
D. 2420
- C. 2060
- B. 6470
- C. 2240
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
B. net hydrogen
Bauxite is an oxide mineral of
A. Ba
B. Bi
C. B
D. Al
D. Al
Which of the following is a synthetic dye?
A. alizarin
B. melanin
C. canotenoid
D. rubber
A. alizarin
The process to transform long chain hydrocarbon into small chains.
A. cracking
B. polymerization
C. isomerization
D. fusion
A. cracking
Commercially important ore of lead is
A. siderite
B. sphalerite
C. galena
D. haematite
C. galena
Brimstone is
A. charcoal
B. sulfur
C. sulfur dioxide
D. form of
diamond
B. sulfur
Brass is an alloy of
A. Cu and Zn
B. Fe and C
C. Cu and Sn
D. Fe and Ni
A. Cu and Zn
Calcium carbonate is also known as
A. chalk
B. feldspar
C. charcoal
D. silica
A. chalk
Butyric acid is found mainly on
A. rancid butter
B. citrus fruits
C. animal fats
D. cellulose
A. rancid butter
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. 82.7 mmHg, 5.5 C & 80.1C
What is the molecular weight of lindane ? (C6H6Cl26)
A. 175.6
B. 221.7
C. 240.5
D. 290.83
D. 290.83
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
D. 90
{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
- 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 - What is the total time? (Choices in hrs)
A. 6.56
B. 6.86
C. 6.65
D. 6.95
- C. 0.113
- C. 6.65
{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.
- What is the temperature in the first effect?
A. 315.8K
B. 381.5 K
C. 318.5 K
D. 351.8 K
- In the second effect?
A. 336.2 K
B. 332.6 K
C. 323.6 K
D. 363.2 K - In the third effect?
A. 305.2 K
B. 352.5 K
C. 325.0 K
D. 332.0 K
- B. 381.5 K
- D. 363.2 K
- C. 325.0 K
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
D. 0.97
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
B. 0.354
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;
- 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 - 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 - 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
- B. -2/9π
- C. 36π
- D. 9π/2
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
B. 658.5 s
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
C. shape of the electron cloud
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
B. orientation in space
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
B. 1/8Л cm