MCQs

Chemical Engineering MCQs with Explanations

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2711Chemical EngineeringMedium

Research octane number refers to the________?

ALow octane number motor fuels

BHigh octane number aviation fuels

CHigh octane number motor fuels

DUnleaded motor fuels

Correct answer

D. Unleaded motor fuels

Explanation

The correct answer is Unleaded motor fuels.

2712Chemical EngineeringMedium

Use of catalyst is a must in the ammonia manufacture, because the reaction is reversible as well as the heat of dissociation of N2 & H2 is high. The presence of promoter along with the catalyst helps in ________ of the catalyst?

AImproving the strength & heat resistance

BIncreasing the effectiveness

CAll A, B & C

DStabilisation

Correct answer

C. All A, B & C

Explanation

The correct answer is All A, B & C.

2713Chemical EngineeringMedium

In case of design of a shell and tube heat exchanger________?

AMinimum tube sheet thickness (in which tubes are fixed) is equal to the O.D. of the tube upto

BMinimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch

CAll A., B. & C.

DO.D. of the tube is 6 to 40 mm while the tube lengths used are 0.5, 2.5, 3.0, 4.0, 5.0, 6 metres

Correct answer

C. All A., B. & C.

Explanation

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

2714Chemical EngineeringMedium

The vapor pressure of liquids of similar chemical nature at any particular temperature ________ with increase in the molecular weight?

ADecreases

BEither A. or B.; depends on the liquid

CIncreases

DRemains unchanged

Correct answer

A. Decreases

Explanation

The correct answer is Decreases.

2715Chemical EngineeringMedium

Bernoulli’s equation is dependent on the________?

AThird law of thermodynamics

BNone of these

CLaw of conservation of momentum

DFirst law of thermodynamics

Correct answer

B. None of these

Explanation

The correct answer is None of these.

2716Chemical EngineeringMedium

Which of the following commonly used condenser tube materials has the lowest thermal conductivity?

ATitanium

BAluminium brass

CStainless steel

DAdmiralty brass

Correct answer

C. Stainless steel

Explanation

The correct answer is Stainless steel.

2717Chemical EngineeringMedium

Chalcopyrite is the main ore of________?

ACopper

BTin

CLead

DIron

Correct answer

A. Copper

Explanation

The correct answer is Copper.

2718Chemical EngineeringMedium

Weber number is significant and is concerned with the________?

ALiquid-liquid mixing

BDispersion of liquid in liquid

CSuspension of solid in liquid

DSolid-liquid mixing

Correct answer

B. Dispersion of liquid in liquid

Explanation

The correct answer is Dispersion of liquid in liquid.

2719Chemical EngineeringMedium

For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because________?

ALewis number is close to unity

BThey are always equal under all circumstances

CSolubility of the components of air in water is very small

DWater has a high latent heat of evaporation

Correct answer

D. Water has a high latent heat of evaporation

Explanation

The correct answer is Water has a high latent heat of evaporation.

2720Chemical EngineeringMedium

Which of the following is the „Blasius equation‟, relating friction factor to the Reynolds number?

Af-0.5 = 4.07 loge (NRef)-0.6

Bf = 0.079.NRe-0.25

CNone of these

DBoth ‘a’ and ‘b’

Correct answer

B. f = 0.079.NRe-0.25

Explanation

The correct answer is f = 0.079.NRe-0.25.

In case of design of a shell and tube heat exchanger________?

AMinimum tube sheet thickness (in which tubes are fixed) is equal to the O.D. of the tube upto

BMinimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch

CAll A., B. & C.

DO.D. of the tube is 6 to 40 mm while the tube lengths used are 0.5, 2.5, 3.0, 4.0, 5.0, 6 metres

Correct answer

C. All A., B. & C.

Explanation

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

For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because________?

ALewis number is close to unity

BThey are always equal under all circumstances

CSolubility of the components of air in water is very small

DWater has a high latent heat of evaporation

Correct answer

D. Water has a high latent heat of evaporation

Explanation

The correct answer is Water has a high latent heat of evaporation.