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Chemical Engineering MCQs with Explanations

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111Chemical EngineeringMedium

Heat flux through several resistances in series in analogous to the current flowing through several________?

AResistances in parallel

BNone of these

CResistances in series

DCapacitors in series

Correct answer

C. Resistances in series

Explanation

The correct answer is Resistances in series.

112Chemical EngineeringMedium

In a shell and tube heat exchanger, the height of 25 percent cut baffles is equal to (where, D = inside diameter of shell)?

A0.50 D

BNone of these

C0.75 D

D0.25 D

Correct answer

C. 0.75 D

Explanation

The correct answer is 0.75 D.

113Chemical EngineeringMedium

With increase in pressure drop (for a given particle size), the dust collection efficiency of a cyclone separator will________?

ARemain unaffected

BDecrease

CIncrease

DIncrease or decrease depending on the nature of the dust

Correct answer

C. Increase

Explanation

The correct answer is Increase.

114Chemical EngineeringMedium

Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around ________ BTU?

ANone of these

B970

C180

D3.97

Correct answer

C. 180

Explanation

The correct answer is 180.

115Chemical EngineeringMedium

The discharge through a Venturimeter depends upon ________?

APressure drop only

BNone of these

CIts orientation

DCo-efficient of contraction only

Correct answer

A. Pressure drop only

Explanation

The correct answer is Pressure drop only.

116Chemical EngineeringMedium

Pick out the one which is a first order instrument?

ABare vapor pressure thermometer

BAll A., B. and C.

CBare metallic thermometer

DMercury in glass thermometer (without any covering or air gap)

Correct answer

B. All A., B. and C.

Explanation

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

117Chemical EngineeringMedium

A present sum of Rs. 100 at the end of one year, with half yearly rate of interest at 10%, will be Rs?

A91

B110

C121

D97

Correct answer

C. 121

Explanation

The correct answer is 121.

118Chemical EngineeringMedium

The operating cost of a distillation column at minimum reflux ratio is________?

AMaximum

BZero

CInfinite

DMinimum

Correct answer

D. Minimum

Explanation

The correct answer is Minimum.

119Chemical EngineeringMedium

With increase in temperature, the equilibrium constant at constant pressure (Kp) for oxidation of sulphur dioxide________?

AIncreases linearly

BIncreases

CDecreases

DDecreases linearly

Correct answer

C. Decreases

Explanation

The correct answer is Decreases.

120Chemical EngineeringMedium

Select the correct statement from the following?

AThe amplitude ratio of a pure capacity process is inversely proportional to frequency

BThe phase lag of a pure time delay system decreases with increasing frequency

CThe amplitude ratio of a pure time delay system increases with frequency

DThe frequency response of a pure capacity process is unbounded

Correct answer

A. The amplitude ratio of a pure capacity process is inversely proportional to frequency

Explanation

The correct answer is The amplitude ratio of a pure capacity process is inversely proportional to frequency.

Select the correct statement from the following?

AThe amplitude ratio of a pure capacity process is inversely proportional to frequency

BThe phase lag of a pure time delay system decreases with increasing frequency

CThe amplitude ratio of a pure time delay system increases with frequency

DThe frequency response of a pure capacity process is unbounded

Correct answer

A. The amplitude ratio of a pure capacity process is inversely proportional to frequency

Explanation

The correct answer is The amplitude ratio of a pure capacity process is inversely proportional to frequency.