MCQs

Chemical Engineering MCQs with Explanations

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2171Chemical EngineeringMedium

Which of the following is not the function of a volute casing provided in a centrifugal pump?

ATo collect liquid from the periphery of the impeller and to transmit it to the delivery pipe at

BTo increase the pump discharge rate

CTo reduce the head loss in discharge

DTo increase the pump efficiency

Correct answer

B. To increase the pump discharge rate

Explanation

The correct answer is To increase the pump discharge rate.

2172Chemical EngineeringMedium

The average thickness of ozone layer in stratosphere is about ________ dobson unit (DU)?

A1500

B230

C750

D20

Correct answer

B. 230

Explanation

The correct answer is 230.

2173Chemical EngineeringMedium

Permanent hardness of water can be removed by________?

APassing it through cation & anion exchangers

BSimply boiling

CAdding alum

DAll (A), B. and (C)

Correct answer

A. Passing it through cation & anion exchangers

Explanation

The correct answer is Passing it through cation & anion exchangers.

2174Chemical EngineeringMedium

Poise is converted into stoke by ________?

AMultiplying with specific gravity

BDividing by specific gravity

CMultiplying with density (gm/c.c)

DDividing by density (gm/c.c)

Correct answer

D. Dividing by density (gm/c.c)

Explanation

The correct answer is Dividing by density (gm/c.c).

2175Chemical EngineeringMedium

The overall mass transfer co-efficient for the absorption of SO2 in air with dilute NaOH solution can be increased substantially by________?

AIncreasing the gas film co-efficient

BDecreasing the total pressure

CIncreasing the liquid film co-efficient

DIncreasing the total pressure

Correct answer

A. Increasing the gas film co-efficient

Explanation

The correct answer is Increasing the gas film co-efficient.

2176Chemical EngineeringMedium

Hydrochloric acid is also known as________?

AOil of vitriol

BStrong organic acid

CGreen acid

DMuriatic acid

Correct answer

D. Muriatic acid

Explanation

The correct answer is Muriatic acid.

2177Chemical EngineeringMedium

For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will________?

AIncrease or decrease depending on the fuel type

BIncrease

CNot change

DDecrease

Correct answer

D. Decrease

Explanation

The correct answer is Decrease.

2178Chemical EngineeringMedium

A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case?

ABoth B. & C.

BBoth the spheres will emit equal amount of radiation per unit time in the beginning

CBoth will absorb equal amount of radiation from the surrounding in the beginning

DThe cooling rate will be the same for the two spheres and hence the two spheres will have

Correct answer

A. Both B. & C.

Explanation

The correct answer is Both B. & C..

2179Chemical EngineeringMedium

Natural gasoline is produced________?

ANone of these

BFrom oil wells

CBy natural gas stripping

DIn oil refineries

Correct answer

C. By natural gas stripping

Explanation

The correct answer is By natural gas stripping.

2180Chemical EngineeringMedium

The ratio of linear stress to linear strain is termed as the ________?

ABulk modulus

BModulus of elasticity

CModulus of rigidity

DNone of these

Correct answer

B. Modulus of elasticity

Explanation

The correct answer is Modulus of elasticity.

Which of the following is not the function of a volute casing provided in a centrifugal pump?

ATo collect liquid from the periphery of the impeller and to transmit it to the delivery pipe at

BTo increase the pump discharge rate

CTo reduce the head loss in discharge

DTo increase the pump efficiency

Correct answer

B. To increase the pump discharge rate

Explanation

The correct answer is To increase the pump discharge rate.

A hollow sphere and a solid sphere of the same material and equal radii are heated to the same temperature. In this case?

ABoth B. & C.

BBoth the spheres will emit equal amount of radiation per unit time in the beginning

CBoth will absorb equal amount of radiation from the surrounding in the beginning

DThe cooling rate will be the same for the two spheres and hence the two spheres will have

Correct answer

A. Both B. & C.

Explanation

The correct answer is Both B. & C..