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Chemical Engineering MCQs with Explanations

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901Chemical EngineeringMedium

Fischer-Tropsch method aims at the ________?

ASynthesis of gasoline (from water gas)

BHydrogenation of coal to produce gasoline

CGasification of coal

DNone of these

Correct answer

A. Synthesis of gasoline (from water gas)

Explanation

The correct answer is Synthesis of gasoline (from water gas).

902Chemical EngineeringMedium

Coal is finally pulverised to 200 mesh size for burning in boilers by a________?

AGyratory crusher

BRoll crusher

CBall mill

DHammer crusher

Correct answer

C. Ball mill

Explanation

The correct answer is Ball mill.

903Chemical EngineeringMedium

To avoid the tearing off the plate of an edge, the margin (i.e., the minimum distance from the centre of the rivet hole to the nearest edge of the plate) should be equal to ________?

A2.5 d

B0.5 d

C1.5 d

Correct answer

C. 1.5 d

Explanation

The correct answer is 1.5 d.

904Chemical EngineeringMedium

Which of the following has the maximum compression ratio?

AVacuum pump

BFan

CCompressor

DBlower

Correct answer

A. Vacuum pump

Explanation

The correct answer is Vacuum pump.

905Chemical EngineeringMedium

Which of the following is unimportant in forced convection?

AGrashoff number

BReynolds number

CPrandtl number

DNone of these

Correct answer

A. Grashoff number

Explanation

The correct answer is Grashoff number.

906Chemical EngineeringMedium

The rate controlling step for the heterogeneous irreversible catalytic reaction A(g) + B(g) → C(g) is the surface reaction of absorbed A with absorbed B to give adsorbed C. The rate expression for this reaction can then be written as (where, KA, KB and KC are the equilibrium constants and is the rate constant of the rate controlling step)?

Ak KA pApB / (1 + KApA + KBpB)

Bk KAKB pApB / (1 + KApA + KBpB + KCpC)2

Ck KAKB pApB / (1 + KApA + KBpB)

Dk KAKB pApB / (1 + KApA + KBpB + KCpC)

Correct answer

B. k KAKB pApB / (1 + KApA + KBpB + KCpC)2

Explanation

The correct answer is k KAKB pApB / (1 + KApA + KBpB + KCpC)2.

907Chemical EngineeringMedium

Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of________?

ACorundum

BFireclay

CSiliceous fireclay

DSilicon carbide

Correct answer

D. Silicon carbide

Explanation

The correct answer is Silicon carbide.

908Chemical EngineeringMedium

Urea is a better fertilizer than ammonium sulphate, because________?

AIt is cheaper

BIt is easy to manufacture

CIt is not poisonous

DNitrogen content is higher

Correct answer

D. Nitrogen content is higher

Explanation

The correct answer is Nitrogen content is higher.

909Chemical EngineeringMedium

The ________ of a chemical company can be obtained directly from the balance sheet as the difference between current assets and current liabilities?

ALiquids assets

BCash ratio

CNet working capital

DCurrent ratio

Correct answer

C. Net working capital

Explanation

The correct answer is Net working capital.

910Chemical EngineeringMedium

All gases except ________ shows a cooling effect during throttling process at atmospheric temperature and pressure?

AAir

BHydrogen

CNitrogen

DOxygen

Correct answer

B. Hydrogen

Explanation

The correct answer is Hydrogen.

901Chemical EngineeringMedium

Fischer-Tropsch method aims at the ________?

ASynthesis of gasoline (from water gas)

BHydrogenation of coal to produce gasoline

CGasification of coal

DNone of these

Correct answer

A. Synthesis of gasoline (from water gas)

Explanation

The correct answer is Synthesis of gasoline (from water gas).

902Chemical EngineeringMedium

Coal is finally pulverised to 200 mesh size for burning in boilers by a________?

AGyratory crusher

BRoll crusher

CBall mill

DHammer crusher

Correct answer

C. Ball mill

Explanation

The correct answer is Ball mill.

903Chemical EngineeringMedium

To avoid the tearing off the plate of an edge, the margin (i.e., the minimum distance from the centre of the rivet hole to the nearest edge of the plate) should be equal to ________?

A2.5 d

B0.5 d

C1.5 d

Correct answer

C. 1.5 d

Explanation

The correct answer is 1.5 d.

904Chemical EngineeringMedium

Which of the following has the maximum compression ratio?

AVacuum pump

BFan

CCompressor

DBlower

Correct answer

A. Vacuum pump

Explanation

The correct answer is Vacuum pump.

905Chemical EngineeringMedium

Which of the following is unimportant in forced convection?

AGrashoff number

BReynolds number

CPrandtl number

DNone of these

Correct answer

A. Grashoff number

Explanation

The correct answer is Grashoff number.

906Chemical EngineeringMedium

The rate controlling step for the heterogeneous irreversible catalytic reaction A(g) + B(g) → C(g) is the surface reaction of absorbed A with absorbed B to give adsorbed C. The rate expression for this reaction can then be written as (where, KA, KB and KC are the equilibrium constants and is the rate constant of the rate controlling step)?

Ak KA pApB / (1 + KApA + KBpB)

Bk KAKB pApB / (1 + KApA + KBpB + KCpC)2

Ck KAKB pApB / (1 + KApA + KBpB)

Dk KAKB pApB / (1 + KApA + KBpB + KCpC)

Correct answer

B. k KAKB pApB / (1 + KApA + KBpB + KCpC)2

Explanation

The correct answer is k KAKB pApB / (1 + KApA + KBpB + KCpC)2.

907Chemical EngineeringMedium

Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of________?

ACorundum

BFireclay

CSiliceous fireclay

DSilicon carbide

Correct answer

D. Silicon carbide

Explanation

The correct answer is Silicon carbide.

908Chemical EngineeringMedium

Urea is a better fertilizer than ammonium sulphate, because________?

AIt is cheaper

BIt is easy to manufacture

CIt is not poisonous

DNitrogen content is higher

Correct answer

D. Nitrogen content is higher

Explanation

The correct answer is Nitrogen content is higher.

909Chemical EngineeringMedium

The ________ of a chemical company can be obtained directly from the balance sheet as the difference between current assets and current liabilities?

ALiquids assets

BCash ratio

CNet working capital

DCurrent ratio

Correct answer

C. Net working capital

Explanation

The correct answer is Net working capital.

910Chemical EngineeringMedium

All gases except ________ shows a cooling effect during throttling process at atmospheric temperature and pressure?

AAir

BHydrogen

CNitrogen

DOxygen

Correct answer

B. Hydrogen

Explanation

The correct answer is Hydrogen.