MCQs

Chemical Engineering MCQs with Explanations

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561Chemical EngineeringMedium

Heat transfer in the laminar sub-layer in case of a liquid flowing through a pipe, is mostly by________?

AConvection

BEddies current

CNone of these

DConduction

Correct answer

D. Conduction

Explanation

The correct answer is Conduction.

562Chemical EngineeringMedium

Absorption (liquid-gas system) with evolution of heat as compared to isothermal absorption results in________?

ALarge minimum liquid to gas (L/G) ratio

BAll A., B. and C.

CLarge number of trays

DDecreased solute solubility

Correct answer

B. All A., B. and C.

Explanation

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

563Chemical EngineeringMedium

The monomer of natural rubber is A. DMT ________?

AIsoprene

BBoth B. and C.

C2 methyl-1 propane

Correct answer

B. Both B. and C.

Explanation

The correct answer is Both B. and C..

564Chemical EngineeringMedium

Centrifugal pumps as compared to reciprocating pumps________?

ADo not need priming

BDeliver fluid with pulsating/fluctuating discharge

CCan be run with discharge line valve closed for a short interval

DRun at a lower speed for the same discharge

Correct answer

C. Can be run with discharge line valve closed for a short interval

Explanation

The correct answer is Can be run with discharge line valve closed for a short interval.

565Chemical EngineeringMedium

Thermal diffusivity of a material ________?

AHas the unit m2 /sec

BAll A., B. and C.

CIs the ratio of thermal conductivity to thermal capacity

DIs defined as K/ρ. Cp

Correct answer

B. All A., B. and C.

Explanation

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

566Chemical EngineeringMedium

The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the ________ of the slag?

AFluidity

BAcidity

CViscosity

DBasicity

Correct answer

A. Fluidity

Explanation

The correct answer is Fluidity.

567Chemical EngineeringMedium

Electrical desalting of crude oil removes the ________ impurities?

AOleophobic

BOleophilic

CNeither A. nor B.

DBoth A. and B.

Correct answer

A. Oleophobic

Explanation

The correct answer is Oleophobic.

568Chemical EngineeringMedium

A thin, flat & square plate measuring 2 m × 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2. The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is ________ W/m2 °C?

A100

B150

C200

D50

Correct answer

A. 100

Explanation

The correct answer is 100.

569Chemical EngineeringMedium

Minimum fluidisation velocity for a specific system depends upon the________?

AParticle size

BDensity of both the particle & the fluid

CFluid viscosity

DAll A., B. and C.

Correct answer

D. All A., B. and C.

Explanation

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

570Chemical EngineeringMedium

Thermal shield used in high powered nuclear reactor to protect the walls of the reactor from radiation damage is made of________?

AConcrete

BZircaloy

CGraphite

DSteel

Correct answer

D. Steel

Explanation

The correct answer is Steel.

Centrifugal pumps as compared to reciprocating pumps________?

ADo not need priming

BDeliver fluid with pulsating/fluctuating discharge

CCan be run with discharge line valve closed for a short interval

DRun at a lower speed for the same discharge

Correct answer

C. Can be run with discharge line valve closed for a short interval

Explanation

The correct answer is Can be run with discharge line valve closed for a short interval.