MCQs

Chemical Engineering MCQs with Explanations

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1441Chemical EngineeringMedium

Out of the following thermocouple wire insulating material, the highest temperature rating is for________?

AAsbestos

BFibre glass

CTeflon

DCeramic fibre

Correct answer

D. Ceramic fibre

Explanation

The correct answer is Ceramic fibre.

1442Chemical EngineeringMedium

Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively?

A1000°C and 10 atm

B500°C and 50 atm

C1000°C and 500 atm

D200°C and 5 atm

Correct answer

A. 1000°C and 10 atm

Explanation

The correct answer is 1000°C and 10 atm.

1443Chemical EngineeringMedium

With increasing flow rate, the hydraulic efficiency of a centrifugal pump________?

ARemains constant

BMonotonically decreases

CIncreases and then decreases

DDecreases and then increases

Correct answer

B. Monotonically decreases

Explanation

The correct answer is Monotonically decreases.

1444Chemical EngineeringMedium

A nitrogenous fertilizer contains 20% N2. It could be________?

ACalcium ammonium nitrate (CAN)

BUrea

CAmmonium chloride

DAmmonium nitrate

Correct answer

A. Calcium ammonium nitrate (CAN)

Explanation

The correct answer is Calcium ammonium nitrate (CAN).

1445Chemical EngineeringMedium

The calibration data of a thermocouple with its cold junction at 0°C are given below. The hot junction of the thermocouple is placed in a bath at 80°C, while its cold junction is at 20°C. What is the emf of thermocouple?

A0.80 mv

B3.26 mv

C2.43 mv

D2.46 mv

Correct answer

D. 2.46 mv

Explanation

The correct answer is 2.46 mv.

1446Chemical EngineeringMedium

In a reversible reaction, a catalyst increases the rate of forward reaction________?

ATo a greater extent than that of the backward reaction

BAnd decreases that of the backward reaction

CAnd the backward reaction equally

DOnly

Correct answer

C. And the backward reaction equally

Explanation

The correct answer is And the backward reaction equally.

1447Chemical EngineeringMedium

Autocatalytic reactions are best carried out in a________?

ACSTR in series

BPlug flow reactor

CRecycle reactor

DCSTR

Correct answer

C. Recycle reactor

Explanation

The correct answer is Recycle reactor.

1448Chemical EngineeringMedium

Which of the following is an adsorbent for removal of nitrogen oxides from gas/air?

ASilica gel

BBog iron (iron oxide)

CPulverised limestone

DActive carbon

Correct answer

A. Silica gel

Explanation

The correct answer is Silica gel.

1449Chemical EngineeringMedium

In saturated gas, the________?

ANone of these

BPartial pressure of vapour equals the vapour pressure of the liquid at room temperature

CVapour is in equilibrium with the liquid at the gas temperature

DVapour is in equilibrium with the liquid at the room temperature

Correct answer

C. Vapour is in equilibrium with the liquid at the gas temperature

Explanation

The correct answer is Vapour is in equilibrium with the liquid at the gas temperature.

1450Chemical EngineeringMedium

Pressure drop (Δp) for a fluid flowing in turbulent flow through a pipe is a function of velocity (V) as________?

AV2.7

BV1.8

CV2

DV-0.2

Correct answer

C. V2

Explanation

The correct answer is V2.

In saturated gas, the________?

ANone of these

BPartial pressure of vapour equals the vapour pressure of the liquid at room temperature

CVapour is in equilibrium with the liquid at the gas temperature

DVapour is in equilibrium with the liquid at the room temperature

Correct answer

C. Vapour is in equilibrium with the liquid at the gas temperature

Explanation

The correct answer is Vapour is in equilibrium with the liquid at the gas temperature.