MCQs

Chemical Engineering MCQs with Explanations

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2401Chemical EngineeringMedium

Gobar gas is produced by the ________ of ‘gobar’ (cow dung)?

ADehydration

BFermentation

COxidation

DHydrolysis

Correct answer

B. Fermentation

Explanation

The correct answer is Fermentation.

2402Chemical EngineeringMedium

In McCabe-Thiele method of theoretical plate calculation for a distillation column, the operating lines of stripping and rectifying sections coincide with the diagonal at ________ reflux?

AMaximum permissible

BTotal

CMinimum

DOperating

Correct answer

B. Total

Explanation

The correct answer is Total.

2403Chemical EngineeringMedium

Pressure required to increase the density of water by about 1% is ________ atmosphere?

A50

B200

C1000

D10

Correct answer

B. 200

Explanation

The correct answer is 200.

2404Chemical EngineeringMedium

Which of the following achieves the least reduction ratio for a given feed size?

AJaw crusher

BRoll crusher

CGyratory crusher

DCone crusher

Correct answer

B. Roll crusher

Explanation

The correct answer is Roll crusher.

2405Chemical EngineeringMedium

Gases having same reduced temperatures and reduced pressures________?

AHave nearly the same compressibility factor

BDeviate from ideal gas behaviour to the same degree

CNeither A. nor B.

DBoth A. and B.

Correct answer

D. Both A. and B.

Explanation

The correct answer is Both A. and B..

2406Chemical EngineeringMedium

Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a________?

ABatch basket centrifuge

BDisc bowl centrifuge

CSharpies super-centrifuge

DSparkler filter

Correct answer

B. Disc bowl centrifuge

Explanation

The correct answer is Disc bowl centrifuge.

2407Chemical EngineeringMedium

Pick out the wrong statement?

AWhen Henry’s law constant is very small, then the mass transfer rate is controlled by the gas

BSieve tray towers are generally used for systems having low interfacial tension

CTaylor-Prandtl analogy for heat and mass transfer considers the transfer through both laminar

DMechanical agitation is required, if the system has low interfacial tension

Correct answer

D. Mechanical agitation is required, if the system has low interfacial tension

Explanation

The correct answer is Mechanical agitation is required, if the system has low interfacial tension.

2408Chemical EngineeringMedium

In the design of a paddle agitator, the ratio (paddle dia/tank dia) is normally taken as________?

A0.5

B0.25

C0.8

D0.1

Correct answer

C. 0.8

Explanation

The correct answer is 0.8.

2409Chemical EngineeringMedium

Ethyl mercaptan is added to the Doctor negative LPG for facilitating the detection of its leakage (by bad odour) to the extent of about ________ ppm?

A50

C10000

D5000

Correct answer

A. 50

Explanation

The correct answer is 50.

2410Chemical EngineeringMedium

In a vertical short tube evaporator (Calandria type), the ________?

ALiquor is inside the tube while the steam is outside the tube

BTube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylindrical drum dia of 1-6 metres are

CArea of central downtake is equal to 40 to 100% of total cross-sectional area of the

DAll A., B. & C.

Correct answer

D. All A., B. & C.

Explanation

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

Pick out the wrong statement?

AWhen Henry’s law constant is very small, then the mass transfer rate is controlled by the gas

BSieve tray towers are generally used for systems having low interfacial tension

CTaylor-Prandtl analogy for heat and mass transfer considers the transfer through both laminar

DMechanical agitation is required, if the system has low interfacial tension

Correct answer

D. Mechanical agitation is required, if the system has low interfacial tension

Explanation

The correct answer is Mechanical agitation is required, if the system has low interfacial tension.

In a vertical short tube evaporator (Calandria type), the ________?

ALiquor is inside the tube while the steam is outside the tube

BTube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylindrical drum dia of 1-6 metres are

CArea of central downtake is equal to 40 to 100% of total cross-sectional area of the

DAll A., B. & C.

Correct answer

D. All A., B. & C.

Explanation

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