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Chemical Engineering MCQs with Explanations

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2291Chemical EngineeringMedium

Pick out the wrong statement?

AStandard screens have circular opening

BHammer crushers operate by impact action

CWith increase in mesh number of screens, their diameter in microns decreases

D200 mesh screen has 200 openings per linear cm

Correct answer

D. 200 mesh screen has 200 openings per linear cm

Explanation

The correct answer is 200 mesh screen has 200 openings per linear cm.

2292Chemical EngineeringMedium

For a spontaneous natural process at constant temperature and pressure, the free energy of the system always________?

AIncreases

BRemain constant

CIncreases to a maximum before decreasing

DDecreases

Correct answer

A. Increases

Explanation

The correct answer is Increases.

2293Chemical EngineeringMedium

Which of the following has the minimum °API gravity of all?

APetrol

BKerosene

CFurnace oil

DDiesel

Correct answer

C. Furnace oil

Explanation

The correct answer is Furnace oil.

2294Chemical EngineeringMedium

Hardened steel is softened by________?

ANormalising

BTempering

CCarburising

DAnnealing

Correct answer

B. Tempering

Explanation

The correct answer is Tempering.

2295Chemical EngineeringMedium

Nickel and ________ are the alloying element added in steel to increase its toughness?

ASilicon

BChromium

CMolybdenum

DVanadium

Correct answer

A. Silicon

Explanation

The correct answer is Silicon.

2296Chemical EngineeringMedium

Electrical conductivities of semi-conductors are of the order of ________ ohm/cm?

A103

B1015

C10-3

D10-15

Correct answer

C. 10-3

Explanation

The correct answer is 10-3.

2297Chemical EngineeringMedium

The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system________?

AEmploys minimum quantity of refrigerant

BConsumer minimum horse power

CHas very high C.O.P.

DIs as light as possible

Correct answer

D. Is as light as possible

Explanation

The correct answer is Is as light as possible.

2298Chemical EngineeringMedium

Cooling water fouling factors vary in the range of 0.001 to 0.003________?

A(W/m2.°K)-1

B(kcal/hr.m2.°C)-1

C(BTU/hr.ft2. °F)-1

D(kcal/hr. m. °C)-1

Correct answer

C. (BTU/hr.ft2. °F)-1

Explanation

The correct answer is (BTU/hr.ft2. °F)-1.

2299Chemical EngineeringMedium

Which of the following is not present in bagasse fibre?

APentogens

BNone of these

CLignin

DCellulose

Correct answer

B. None of these

Explanation

The correct answer is None of these.

2300Chemical EngineeringMedium

In nylon-66, the first and second numbers (i.e., 6) respectively designate the number of carbon atoms present in the________?

ADiamine and the ring

BDibasic acid and the ring

CNone of these

DDiamine and the dibasic acid

Correct answer

D. Diamine and the dibasic acid

Explanation

The correct answer is Diamine and the dibasic acid.

Pick out the wrong statement?

AStandard screens have circular opening

BHammer crushers operate by impact action

CWith increase in mesh number of screens, their diameter in microns decreases

D200 mesh screen has 200 openings per linear cm

Correct answer

D. 200 mesh screen has 200 openings per linear cm

Explanation

The correct answer is 200 mesh screen has 200 openings per linear cm.