MCQs

Chemical Engineering MCQs with Explanations

Read every question, see the correct answer, and understand the explanation at your own pace. Study mode has no timer and no negative marking.

11%

950 of 8,342MCQs reviewed

Study Mode — explanations are always visiblePrefer a timed quiz? Start test

951Chemical EngineeringMedium

Pick out the correct statement pertaining to transition/ entrance length in fluid flow?

AThe length of entrance region of pipe, in which full development of fluid flow takes place

BAll A., B. and C.

CTransition length for laminar flow of Newtonian fluids in a pipe of diameter ‘d’ is equal to

DTransition length for turbulent flow of Newtonian fluids in a smooth pipe of diameter ‘d’ is

Correct answer

B. All A., B. and C.

Explanation

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

952Chemical EngineeringMedium

Prandtl number is the reciprocal of________?

AThermal diffusivity × Mass diffusivity

BThermal diffusivity/Momentum diffusivity

CMass diffusivity × Momentum diffusivity

DThermal diffusivity × Momentum

Correct answer

B. Thermal diffusivity/Momentum diffusivity

Explanation

The correct answer is Thermal diffusivity/Momentum diffusivity.

953Chemical EngineeringMedium

The difference between total carbon and fixed carbon of coal will be minimum in case of________?

AHigh temperature coke (V.M < 0.5%)

BBituminous coal

CAnthracite

DLignite

Correct answer

A. High temperature coke (V.M < 0.5%)

Explanation

The correct answer is High temperature coke (V.M < 0.5%).

954Chemical EngineeringMedium

The work index in Bond’s law for crushing of solids has the following dimensions________?

AkWh/ton

BkW/ton

CNo units (dimensionless)

DkWh.m1/2/ton

Correct answer

A. kWh/ton

Explanation

The correct answer is kWh/ton.

955Chemical EngineeringMedium

Vertical condenser is advantageous to the horizontal condenser from operation point of view, when________?

ASub-cooling of condensate is desired

BHydrostatic head is required for refluxing the condensate

CBoth the functions of condensation & sub cooling are carried out in a single unit

DOnly the function of condensation is to be carried out

Correct answer

C. Both the functions of condensation & sub cooling are carried out in a single unit

Explanation

The correct answer is Both the functions of condensation & sub cooling are carried out in a single unit.

956Chemical EngineeringMedium

Gaseous diffusion co-efficient increases with increase in the________?

ABoth A. & B.

BNeither A. nor B.

CTemperature

DPressure

Correct answer

C. Temperature

Explanation

The correct answer is Temperature.

957Chemical EngineeringMedium

For efficient grinding, ball mills must be operated________?

AAt a speed more than the critical speed

BWith minimum possible small balls

CAt a speed equal to the critical speed

DAt a speed less than the critical speed

Correct answer

D. At a speed less than the critical speed

Explanation

The correct answer is At a speed less than the critical speed.

958Chemical EngineeringMedium

Laminar flow is characterised by the nonexistence of________?

AEddies

BPressure fluctuation

CDeviating velocities

DAll A., B. & C.

Correct answer

D. All A., B. & C.

Explanation

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

959Chemical EngineeringMedium

Pick out the wrong statement?

AAbrasion index of the coke is a measure of its hardness

BReactivity of coke is inversely proportional to its absolute density

CCokes of high reactivity are obtained from weakly coking coals

DCokes of high reactivity are obtained from strongly coking coals

Correct answer

D. Cokes of high reactivity are obtained from strongly coking coals

Explanation

The correct answer is Cokes of high reactivity are obtained from strongly coking coals.

960Chemical EngineeringMedium

Assuming flow to be laminar, if the diameter of the pipe is halved, then the pressure drop will________?

ABe quadrupled

BIncrease

CRemain same

DDecrease

Correct answer

B. Increase

Explanation

The correct answer is Increase.

Pick out the correct statement pertaining to transition/ entrance length in fluid flow?

AThe length of entrance region of pipe, in which full development of fluid flow takes place

BAll A., B. and C.

CTransition length for laminar flow of Newtonian fluids in a pipe of diameter ‘d’ is equal to

DTransition length for turbulent flow of Newtonian fluids in a smooth pipe of diameter ‘d’ is

Correct answer

B. All A., B. and C.

Explanation

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

Vertical condenser is advantageous to the horizontal condenser from operation point of view, when________?

ASub-cooling of condensate is desired

BHydrostatic head is required for refluxing the condensate

CBoth the functions of condensation & sub cooling are carried out in a single unit

DOnly the function of condensation is to be carried out

Correct answer

C. Both the functions of condensation & sub cooling are carried out in a single unit

Explanation

The correct answer is Both the functions of condensation & sub cooling are carried out in a single unit.

Pick out the wrong statement?

AAbrasion index of the coke is a measure of its hardness

BReactivity of coke is inversely proportional to its absolute density

CCokes of high reactivity are obtained from weakly coking coals

DCokes of high reactivity are obtained from strongly coking coals

Correct answer

D. Cokes of high reactivity are obtained from strongly coking coals

Explanation

The correct answer is Cokes of high reactivity are obtained from strongly coking coals.