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Chemical Engineering MCQs with Explanations

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31Chemical EngineeringMedium

Persons working in cement plants and limestone quarries are more prone to disease like________?

AAsthma

BCancer

CSilicosis

DFluorosis (bone disease)

Correct answer

C. Silicosis

Explanation

The correct answer is Silicosis.

32Chemical EngineeringMedium

Dry air required to burn 1 kg of carbon completely may be around ________ kg?

A38

B11

D20

Correct answer

B. 11

Explanation

The correct answer is 11.

33Chemical EngineeringMedium

A long cylinder and a sphere both of 5 cms diameter are made from the same porous material. The flat ends of cylinder are sealed. Both the cylinder and sphere are saturated with the same solution of sodium chloride. Later both the objects are immersed for a short and equal interval of time in a large tank of water which is well agitated. The fraction of salt remaining in the cylinder and the sphere are Xc and Xs respectively. Which of the following statement is correct?

AXc greater/less than Xs depending on the length of the cylinder

BXc > Xs

Correct answer

B. Xc > Xs

Explanation

The correct answer is Xc > Xs.

34Chemical EngineeringMedium

A tube mill compared to a ball mill________?

AProduces a coarser product

BUses much larger balls

CHas a higher length/diameter ratio

DHas a higher diameter/length ratio

Correct answer

C. Has a higher length/diameter ratio

Explanation

The correct answer is Has a higher length/diameter ratio.

35Chemical EngineeringMedium

The energy loss over a length of pipeline according to Darcy-Weisbach equation for pipe flow is ________ the mean velocity of flow?

ADirectly proportional to square of

BDirectly proportional to

CInversely proportional to

DInversely proportional to square of

Correct answer

A. Directly proportional to square of

Explanation

The correct answer is Directly proportional to square of.

36Chemical EngineeringMedium

Heat of reaction is a function of the________?

ABoth A. & B.

BNeither A. nor B.

CPressure

DTemperature

Correct answer

A. Both A. & B.

Explanation

The correct answer is Both A. & B..

37Chemical EngineeringMedium

Mild steel has ________ crystal lattice structure?

ABody centred cubic (bcc)

BFace centred cubic (fcc)

COrthorhombic

DCubic

Correct answer

A. Body centred cubic (bcc)

Explanation

The correct answer is Body centred cubic (bcc).

38Chemical EngineeringMedium

Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed?

ADry grinding of large particles in un-baffed mills

BWet grinding in high viscous suspension

CWet grinding in low viscous suspension

DDry grinding of large particles (upto 1.25 cms)

Correct answer

A. Dry grinding of large particles in un-baffed mills

Explanation

The correct answer is Dry grinding of large particles in un-baffed mills.

39Chemical EngineeringMedium

Pulverised fuel fired furnaces employ ________ fuel firing?

AVertical

BHorizontal

CTangential

DAll A., B. and C.

Correct answer

D. All A., B. and C.

Explanation

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

40Chemical EngineeringMedium

Calcination reaction of limestone (CaCO3 → CaO + CO2) goes to completion in the rotary kiln, because________?

ACaO is not dissociated

BOf high calcination temperature

CCO2 escapes continuously

DCaO is more stable than CaCO3

Correct answer

C. CO2 escapes continuously

Explanation

The correct answer is CO2 escapes continuously.

Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed?

ADry grinding of large particles in un-baffed mills

BWet grinding in high viscous suspension

CWet grinding in low viscous suspension

DDry grinding of large particles (upto 1.25 cms)

Correct answer

A. Dry grinding of large particles in un-baffed mills

Explanation

The correct answer is Dry grinding of large particles in un-baffed mills.