MCQs

Chemical Engineering MCQs with Explanations

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1681Chemical EngineeringMedium

Validity of the relationship, inputs = outputs, holds good for the system at steady state________?

AWithout chemical reaction

BWith chemical reaction

CNone of these

DWithout chemical reaction & losses

Correct answer

D. Without chemical reaction & losses

Explanation

The correct answer is Without chemical reaction & losses.

1682Chemical EngineeringMedium

A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg-1. K-1. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg-1, K-1 is________?

A3.91

B-1.87

C1.26

Correct answer

D. 0

Explanation

The correct answer is 0.

1683Chemical EngineeringMedium

________ heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side?

AThree pass, fixed tube sheet

BNone of these

CU-tube

DSingle pass, fixed tube sheet

Correct answer

C. U-tube

Explanation

The correct answer is U-tube.

1684Chemical EngineeringMedium

A form of stress corrosion failure termed as ‘season cracking’ is generally observed in ________?

ABorosilicate glasses

BHigh carbon steels

CThermosetting polymers

DBrasses

Correct answer

D. Brasses

Explanation

The correct answer is Brasses.

1685Chemical EngineeringMedium

Heat transfer co-efficient for a horizontal condenser as compared to a vertical condenser operating under similar conditions is________?

AAbout 0.33 times

BSame

CAbout 3 times

DLess

Correct answer

C. About 3 times

Explanation

The correct answer is About 3 times.

1686Chemical EngineeringMedium

Pick the odd man out?

ABriquettes

BWood

CPitch creosote mixture

DOil gas

Correct answer

B. Wood

Explanation

The correct answer is Wood.

1687Chemical EngineeringMedium

Triple superphosphate is chemically represented as________?

A3Ca3(PO4)2

BCa(PO3)2

CCa(H2PO4)2

DCaF2.3Ca3(PO4)2

Correct answer

D. CaF2.3Ca3(PO4)2

Explanation

The correct answer is CaF2.3Ca3(PO4)2.

1688Chemical EngineeringMedium

A mercury thermometer cannot be used to measure the temperature below the freezing point of mercury, which is ________ °C?

A-11.9

B-60.9

C-80.9

D-38.9

Correct answer

D. -38.9

Explanation

The correct answer is -38.9.

1689Chemical EngineeringMedium

Smoke point of kerosene is the________?

ATime after which smoking starts on burning

BNone of these

CTemperature at which smoking starts

DMaximum height of flame (in mm) without causing smoking, when burnt in a standard lamp

Correct answer

C. Temperature at which smoking starts

Explanation

The correct answer is Temperature at which smoking starts.

1690Chemical EngineeringMedium

Dew point temperature always gives an indication of the ________ of the moist air?

ALatent heat

BMoisture content

CDryness

DCoolness

Correct answer

B. Moisture content

Explanation

The correct answer is Moisture content.

Smoke point of kerosene is the________?

ATime after which smoking starts on burning

BNone of these

CTemperature at which smoking starts

DMaximum height of flame (in mm) without causing smoking, when burnt in a standard lamp

Correct answer

C. Temperature at which smoking starts

Explanation

The correct answer is Temperature at which smoking starts.