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PBE Flashcards

MEMORIZE AND LEARN

1
Q

A cyclone separator, 0.3 m in diameter and 1.2 m long, has a circular inlet 75 mm in diameter and an outlet of the same size. If the gas enters at a velocity of 1.5 m/s, at what particle size will the theoretical cut occur? The viscosity of air is 0.018 mN s/m2, the density of air is 1.3 kg/m3 and the density of the particles is 2700 kg/m3.

A

2.17 × 10−6 m or 2.17 μm

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2
Q

Glass spheres are fluidised by water at a velocity equal to one half of their terminal falling velocities. Calculate:
(a) voidage
(b) the density of the fluidised bed,
(c) the pressure gradient in the bed attributable to the presence of the particles.
The particles are 2 mm in diameter and have a density of 2500 kg/m3. The density and viscosity of water are 1000 kg/m3 and 1 mNs/m2 respectively. (sa original na tanong given naman yung galileo no.)

A

e = 0.755

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3
Q

Glass spheres are fluidised by water at a velocity equal to one half of their terminal falling velocities. Calculate:
(b) the density of the fluidised bed,
The particles are 2 mm in diameter and have a density of 2500 kg/m3. The density and viscosity of water are 1000 kg/m3 and 1 mNs/m2 respectively. (sa original na tanong given naman yung galileo no.)

A

1367 kg/m3

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4
Q

Glass spheres are fluidised by water at a velocity equal to one half of their terminal falling velocities. Calculate:
(c) the pressure gradient in the bed attributable to the presence of the particles.
The particles are 2 mm in diameter and have a density of 2500 kg/m3. The density and viscosity of water are 1000 kg/m3 and 1 mNs/m2 respectively. (sa original na tanong given naman yung galileo no.)

A

3605 (N/m2)/m

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5
Q

A liquid with no appreciable elevation of boiling-point is concentrated in a triple-effect evaporator. If 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, what are the approximate boiling-points in the three effects? The overall transfer coefficients may be taken as 3.1, 2.3, and 1.1 kW/m2 K in the three effects respectively.

A

381.5K
363.2K
325K

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6
Q

In order to extract acetic acid from dilute aqueous solution with isopropyl ether, the two immiscible phases are passed countercurrently through a packed column 3 m in length and 75 mm in diameter.
It is found that, if 0.5 kg/m2s of the pure ether is used to extract 0.25 kg/m2s of 4.0 per cent acid bymass, then the ether phase leaves the column with a concentration of 1.0 per cent acid by mass. (kg acid/kg isopropyl ether) = 0.3 (kg acid/kg water).
Calculate:
(a) the number of overall transfer units based on the raffinate phase, and

A

0.461

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7
Q

In order to extract acetic acid from dilute aqueous solution with isopropyl ether, the two immiscible phases are passed countercurrently through a packed column 3 m in length and 75 mm in diameter.
It is found that, if 0.5 kg/m2s of the pure ether is used to extract 0.25 kg/m2s of 4.0 per cent acid bymass, then the ether phase leaves the column with a concentration of 1.0 per cent acid by mass. (kg acid/kg isopropyl ether) = 0.3 (kg acid/kg water).
Calculate:
the overall extraction coefficient based on the raffinate phase.

A

5.53

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8
Q

Seeds containing 20% by mass of oil, are extracted in a countercurrent plant,and 90% of the oil is recovered in a solution containing 50% by mass of oil. I fthe seeds are extratced by fresh solvent and 1kg of solution is removed in the underflowin association with every 2kg of insoluble matter, how many ideal stages are requried?

A

5 thickeners

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9
Q

TiCl4 can be formed by reacting titanium dioxide (TiO2) with hydrochloric acid. TiO2 is available as an ore containing 78 % TiO2 and 22 % inerts. The HCl is available as 45 wt% solution (the balance is water). The per pass conversion of TiO2 is 75 %. The HCl is fed into the reactor in 20 % excess based on the reaction. Pure unreacted TiO2 is recycled back to mix with the TiO2 feed. TiO2 + 4 HCl → TiCl4 + 2 H2O For 1 kg of TiCl4 produced, determine: a. the kg of TiO2 ore fed.

A

see himmelbalau

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10
Q

A pump draws a solution of specific gravity 1.84 from a storage tank through a 3 in. (75-mm) Schedule 40 steel pipe. The efficiency of the pump is 60 percent. The velocity in the suction line is 3 ft/s (0.914 m/s). The pump discharges through a 2-in. (50-mm) Schedule 40 pipe to an overhead tank. The end of the discharge pipe is 50 ft (15.2 m) above the level of the solution in the feed tank. Friction losses in the entire piping system are 10 ft lbf/lbm (29.9 J/kg). What pressure must the pump develop? What is the power delivered to the fluid by the pump?

A

see mccabe and smith

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11
Q

The synthesis of ammonia proceeds according to the following reaction N2 + 3 H2 —–> 2 NH3 In a given plant, 4202 lb of nitrogen and 1046 lb of hydrogen are fed to the synthesis reactor per hour. Production of pure ammonia from this reactor is 3060 lb per hour. a. What is the limiting reactant. b. What is the percent excess reactant. c. What is the percent conversion obtained (based on the limiting reactant).

A

see himmelblau?

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12
Q

What unit operation originated in Trona Process?

A

crystallization

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13
Q

Based on the following reactions, choose the Hagreave’s process.

A

Production of Sodium Sulfate (Na2SO4)

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14
Q

In the calculation of the compressibility factor, which of the following equations apply for a high pressure condition

A

Z=1 + BP/RT

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15
Q

If the concentration of the reactant increases, the half life decreases, what order of the reaction is this?

A

2nd Order Reaction

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16
Q

Which of the following is the reaction time is directly proportional to the concentration of the reactant?

A

zero order

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17
Q

Which of the following process uses the MIMO system in controlling their process parameter?

A

distillation column

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18
Q

How is the fluctuation in the process is controlled?

A

Equipping the instrument with integral controller

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19
Q

What do yu call the temperature in which the reactor condition cannot be controlled?

A

runaway temperature

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20
Q

A mixture of water and ethyl alcohol containing 0.16 mole fraction alcohol is continuously distilled in a plate fractionating column(Problem 11.3) … Determine number of theoretical plates.

A

see problem 11.3

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21
Q

10Mg of a solution containing 0.3kg Na2CO3/kg solution is cooled slowly to 293K to form crystals of Na2CO3X10H20. What is the yield of crystals…

A

6536 kg

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22
Q

Hydrogen is pumped from a reservoir at 2MN/m2 pressure through a clean horizontal mildsteel pipe 50mm diameter and 500 m long. what is the flowarate?

A

0.213kg/s

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23
Q

Hydrogen is pumped from a reservoir at 2MN/m2 pressure through a clean horizontal mildsteel pipe 50mm diameter and 500 m long. What is the effective rate?

A

113kw

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24
Q

Tests on a small scale tank 0.3m diameter (Rushton Impeller, diameter 0.1m) have shown that a blending process…
a.) what speed should be chosen for the larger impeller

A

0.346Hz/ 20.8 rev/min

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25
Q

Tests on a small scale tank 0.3m diameter (Rushton Impeller, diameter 0.1m) have shown that a blending process…
b) What power will be required?

A

9.8 W

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26
Q

Tests on a small scale tank 0.3m diameter (Rushton Impeller, diameter 0.1m) have shown that a blending process…
c. What will be the blend time in the large tank

A

1.15min

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27
Q

600L/s of water at 320K is pumped through in a 40mm inside diameter pipe through lengthof 150m in a horizontal direction up through a vertical height…what power must be delivered to the pump if it is 60% efficient?

A

128W

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28
Q

MW OF SUCROSE

A

C12H22O11-342.3

29
Q

Definition of henrys law

A

states that the amount of dissolved gas is proportional to its partial pressure in the gas phase

30
Q

Given pH of dolomite=6.6, if pH becomes 5.6, what is the concentration of Calcium and Magnesium?

A

see this problem

31
Q

Acontact process plant produces 98% H2SO4 by absorbing SO3 in 97.3% H2SO4. A gas contains 8% SO3 (92% inert) enters the absorption tower at a rate of 28 lbmol/hr and 98.5% of SO3 is absorbed in the process. A 95.9% H2SO4 was used as a make-up acid in the process.
Reaction: H2O + SO3 –> H2SO4
(a) Calculate the amount of 95.9% H2SO4 used in tons/day (choices are in lbs)

A

see this problem

32
Q

Acontact process plant produces 98% H2SO4 by absorbing SO3 in 97.3% H2SO4. A gas contains 8% SO3 (92% inert) enters the absorption tower at a rate of 28 lbmol/hr and 98.5% of SO3 is absorbed in the process. A 95.9% H2SO4 was used as a make-up acid in the process.
Reaction: H2O + SO3 –> H2SO4
(b) Calculate the 97.3% H2SO4 used in tons/day (choices are in lbs)

A

see

33
Q

Acontact process plant produces 98% H2SO4 by absorbing SO3 in 97.3% H2SO4. A gas contains 8% SO3 (92% inert) enters the absorption tower at a rate of 28 lbmol/hr and 98.5% of SO3 is absorbed in the process. A 95.9% H2SO4 was used as a make-up acid in the process.
Reaction: H2O + SO3 –> H2SO4
(c) Amount of 98% H2SO4 produced in ton/day (choices are in lbs)

A

see

34
Q

Your plant has a furnace that uses a fuel that contains sulfur and negligible amount of nitrogen. A scrubber with 90% sulfur reductance was installed. The water scrubber treated with caustic soda ptoducing bisulfate.
(a) What is the amount of sulfur in the feed if 980 kg of bisulfate was produced?

A

see

35
Q

Your plant has a furnace that uses a fuel that contains sulfur and negligible amount of nitrogen. A scrubber with 90% sulfur reductance was installed. The water scrubber treated with caustic soda ptoducing bisulfate.
(b) How much caustic soda was used?

A

see

36
Q

Your plant has a furnace that uses a fuel that contains sulfur and negligible amount of nitrogen. A scrubber with 90% sulfur reductance was installed. The water scrubber treated with caustic soda ptoducing bisulfate.
(c) How much SO2 was produced?

A

see

37
Q

Water at 45degC and 10 kPa enters an adiabatic pump and is discharged at a pressure of 8600 kPa. Assume the pump efficiency to be 0.75.
Data: V=1010 cm3/g, Volume Expansivity (beta) = 425 x10-6 /K and Cp=4.178 kJ/kg-K
Calculate the following:
(a) work of the pump

A

11.57kj/kg

38
Q

Water at 45degC and 10 kPa enters an adiabatic pump and is discharged at a pressure of 8600 kPa. Assume the pump efficiency to be 0.75.
Data: V=1010 cm3/g, Volume Expansivity (beta) = 425 x10-6 /K and Cp=4.178 kJ/kg-K
Calculate the following:
(b) temp change of water
(c) entropy change

A

0.97C, 0.009KJ/Kg K

39
Q
  1. 4 m3/s flowrate from a tank is to be delivered to another tank. Using parallel flow, d1=0.6m and d2=0.4m. Use f=1/(1/4 x Re).
    (a) What is the velocity at d1?
    (b) What is the velocity at d2?
    (c) What is the diameter if one pipe is used?
A

see

40
Q

Example of pseudo plastic fluid

a. apple sauce c. tap water
b. rubber latex d. sewage sludge

A

apple sauce

41
Q

Process of breaking down a large isotope into smaller isotopes.

A

nuclear fission

42
Q

Red Lead

A

Pb3O4

43
Q

Can oxygen be synthesized from nitrogen?

A

impossible

44
Q

Author of octet rule

A

(Gilbert Lewis)

45
Q

How does alpha, beta and gamma particle affect the mass number of an atom?

A

4,0,0

46
Q

Iodine vapor forms iodine crystals when it touches a cold surface. What is the reverse of the process being described?

A

sublimation

47
Q

Notation on alkane containing Cl

A

chloro

48
Q 
Given: Dodecane
I. Is it soluble in water?
II. Is it soluble in hexane?
III. Is it combustible?
IV. Is it solid, liquid or gas at room temp. & atmospheric conditions?
V. Is it denser than water?
A

no, yes, yes, liquid, less dense

49
Q

Characteristics of elements under group 1A

A

Has 1 electron on its outer most energy level

50
Q 
tank is half filled with water, if N2 =1.02 moles and H20 =1.02 moles. What happens to the N2 when dissolved in water?
a. increase
b. decrease
Page 2
c. remains the same
d. none of these
A

solve

51
Q

Description of a primary and a secondary cell

A

A primary cell can be recharged while secondary cannot, Ni-Cd is a primary cell, a dry cell is a secondary cell.

52
Q

Adolf Baeyer’s contribution in medicine, made by reacting malonic acid and urea with a catalyst is called

A

barbituric acid

53
Q

Composition of acid in acid rain?

A

nitric and sulfuric

54
Q

Which of the ff has a higher heat of combustion on a gram per gram basis if Hf is 237 kj/mol and 532 kj/mol for methane and propane respectively? (

A

methane)

55
Q

How to differentiate alkane alkene and alkyne?

A

rxn with Br2

56
Q

Which of the ff. has a larger ionic nucleus? Na+ or Na?

A

Na

57
Q

What happens to the melting point of a saturated fatty acid if -CH2- increase?

A

increase

58
Q

Formula of alar

A

(C6H12N2O3)

59
Q

Particle with the same mass as proton.

A

(neutron

60
Q

Arrange in increasing level of toxicity

A

1: heptachlor 2: dieldrum 3: DDT 4: Arsenic 5: Cr

61
Q

Polymer used in bullet proof vest

A

polyarylonitrile

62
Q

Other term of earth wax

A

(ozocerite)

63
Q

Other name of Yamatake system (process automation - DCS)

A

azbil

64
Q

What is used in ultrasonic flow meters

A

(In HB. Doppler)

65
Q

Which of the following is not dependent on temperature and wavelength?

A

black body

66
Q

Electronic noise inside an electric conductor which is independent of applied voltage

A

johnson noise

67
Q

Difference between measured value and set point

A

error

68
Q

Which of the ff industries( stated in the question that the industry itself is a power plant) produces electricity aside from its main product.

a. oil refinery
b. sugar industry
c. biomass industry

A

b. sugar industry

board exam (3 decks)

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