Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 140 of 557.

Chemical Engineering MCQs

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Froth floatation is used for________?

A.Washing fine coal dust (< 0.5 mm size)

B.All A., B. and C.

C.Washing lump coal (> 80 mm size)

D.Removing ash from the coal based on difference in specific gravity of coal and ash

Explanation: The correct answer is Washing fine coal dust (< 0.5 mm size).

Submitted by: Academy of Pakistan

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Neoprene is a________?

A.None of these

B.Monomer

C.Synthetic rubber

D.Polyester

Explanation: The correct answer is Synthetic rubber.

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Cd for the orifice plate varies from ________?

A.0.58 to 0.8

B.0.93 to 0.98

C.0.02 to 0.03

D.0.2 to 0.3

Explanation: The correct answer is 0.58 to 0.8.

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Pick out the wrong statement?

A.The temperature at which a vapor is saturated is termed as the boiling point

B.A vapor whose partial pressure is less than its equilibrium vapor pressure, is termed as a ‘superheated vapor’

C.The difference between the existing temperature of a vapor and its saturation temperature (i.e.dew point) is called its ‘degree of superheat’

D.A vapor is termed as a saturated vapor, if its partial pressure equals its equilibrium vapor pressure

Explanation: The correct answer is The temperature at which a vapor is saturated is termed as the boiling point.

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The main feature of Carnot refrigeration cycle is that, it________?

A.Transfers heat from high temperature to low temperature

B.None of these

C.Accomplishes the reverse effect of the heat engine

D.Does not need the addition of external work for its functioning

Explanation: The correct answer is Accomplishes the reverse effect of the heat engine.

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A control rod________?

A.Is generally made of boron, hafnium or cadmium

B.Should have small absorption cross-section

C.Should have large absorption cross-section

D.Both B. and C.

Explanation: The correct answer is Both B. and C..

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Kirchoff’s law is applicable to________?

A.Only volumes and not to surfaces

B.Both A. and B.

C.Total radiation only

D.Monochromatic radiation only

Explanation: The correct answer is Both A. and B..

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Response of a linear control system for a change in set point is called ________?

A.Transient response

B.Servo problem

C.Regulator problem

D.Frequency response

Explanation: The correct answer is Servo problem.

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The boiling & freezing points on a newly defined temperature scale in degree ‘D’ are 400°D & 100°D respectively. The temperature reading corresponding to 60°C on this new temperature scale will be equal to ________ °D?

A.140

B.180

C.280

D.240

Explanation: The correct answer is 280.

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Compressibility factor (i.e., the ratio of actual volume of gas to the volume predicted by ideal gas law) for all gases are________?

A.Both B. & C

B.Always greater than one

C.Same at the same reduced temperature

D.Same at the same reduced pressure

Explanation: The correct answer is Both B. & C.

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Spray test determines the ________ of refractories?

A.Permanent linear change

B.RUL

C.Resistance to CO attack

D.Resistance to slag penetration

Explanation: The correct answer is Resistance to slag penetration.

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If pore diffusion is the controlling step in a solid catalysed reaction, the catalyst________?

A.Porosity is of less importance

B.Internal surface area is utilised efficiently

C.None of these

D.Porosity is very important

Explanation: The correct answer is Porosity is of less importance.

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Cation exchanger is regenerated usually with________?

A.Hydrazine

B.NaOH

C.H2SO4

D.Alum solution

Explanation: The correct answer is H2SO4.

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Nitrolime is chemically known as________?

A.Calcium ammonium nitrate (CAN)

B.None of these

C.Calcium nitrate

D.Ammonium nitrate

Explanation: The correct answer is Calcium ammonium nitrate (CAN).

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Internal energy of an element at 1 atm and 25° C is ________ kcal/kg.mole?

A.273

B.None of these

C.25

D.0

Explanation: The correct answer is 0.

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