MCQs

Chemical Engineering MCQs with Explanations

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3441Chemical EngineeringMedium

Refluxing of part of the distillate in a fractionating column is a ‘recycling operation’, aimed primarily at________?

ANone of these

BProduct enrichment

CHeat conservation

DYield enhancement

Correct answer

B. Product enrichment

Explanation

The correct answer is Product enrichment.

3442Chemical EngineeringMedium

For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as________?

ARe

BRe0.53

CRe0.33

DRe0.83

Correct answer

D. Re0.83

Explanation

The correct answer is Re0.83.

3443Chemical EngineeringMedium

A petroleum well is called ‘dry’, if it contains ________?

AOnly natural gas

BNo natural gas

CVery little oil

DAll A., B. and C.

Correct answer

A. Only natural gas

Explanation

The correct answer is Only natural gas.

3444Chemical EngineeringMedium

For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance)?

ANone of these

BV/Vmax = (r/x)1/7

CV/Vmax = (x/r)1/7

Correct answer

C. V/Vmax = (x/r)1/7

Explanation

The correct answer is V/Vmax = (x/r)1/7.

3445Chemical EngineeringMedium

The normal range of velocity of water in pipes is ________ m/sec?

A0.1-0.5

B15-30

C10-50

D1-2

Correct answer

D. 1-2

Explanation

The correct answer is 1-2.

3446Chemical EngineeringMedium

A rigid vessel containing three moles of nitrogen gas at 30°C is heated to 250°C. Assume the average capacities of nitrogen to be Cp = 29.1 J/mole.°C and, Cv = 20.8 J/mole.°C. The heat required, neglecting the heat capacity of the vessel, is________?

A4576 J

B13728 J

C12712 J

D19206 J

Correct answer

D. 19206 J

Explanation

The correct answer is 19206 J.

3447Chemical EngineeringMedium

Presence of carbonaceous matter in the sewage________?

AIncreases the quantity of chlorine used for its purification

BCauses reduction in its dissolved oxygen content thereby endangering the life of aquatic

CReduces sulphate ions to sulphides causing obnoxious smell

DAll A, B. and C.

Correct answer

D. All A, B. and C.

Explanation

The correct answer is All A, B. and C..

3448Chemical EngineeringMedium

The enthalpy change when ammonia gas is dissolved in water is called the heat of________?

ADilution

BSolution

CCombustion

DFormation

Correct answer

B. Solution

Explanation

The correct answer is Solution.

3449Chemical EngineeringMedium

It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/kg.K. The rate at which the heat has to be supplied in (kJ/min) to the evaporator is________?

A9.08 × 105

B6.12 × 105

C7.24 × 105

D3.06 × 105

Correct answer

D. 3.06 × 105

Explanation

The correct answer is 3.06 × 105.

3450Chemical EngineeringMedium

________ of air does not increase with increase in temperature?

AThermal diffusivity

BDensity

CViscosity

DThermal conductivity

Correct answer

B. Density

Explanation

The correct answer is Density.

Presence of carbonaceous matter in the sewage________?

AIncreases the quantity of chlorine used for its purification

BCauses reduction in its dissolved oxygen content thereby endangering the life of aquatic

CReduces sulphate ions to sulphides causing obnoxious smell

DAll A, B. and C.

Correct answer

D. All A, B. and C.

Explanation

The correct answer is All A, B. and C..