MCQs

Chemical Engineering MCQs with Explanations

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3181Chemical EngineeringMedium

Products drawn from the top to bottom of the crude oil distillation column has progressively increasing ________?

AC/H ratio

BAll A., B. and C.

CMolecular weight

DBoiling points

Correct answer

B. All A., B. and C.

Explanation

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

3182Chemical EngineeringMedium

The ratio of kinematic viscosity to thermal diffusivity is called the ________ number?

AStanton

BNusselt

CPeclet

DPrandtl

Correct answer

D. Prandtl

Explanation

The correct answer is Prandtl.

3183Chemical EngineeringMedium

Permanent hardness of water is due to the presence of calcium & magnesium ________?

ACarbonate

BBi-carbonates

CNone of these

DSulphates & chlorides

Correct answer

D. Sulphates & chlorides

Explanation

The correct answer is Sulphates & chlorides.

3184Chemical EngineeringMedium

Vacuum is generally maintained in the vapour space of an evaporator mainly to________?

AGet economical temperature difference by using moderate pressure steam

BFacilitate forward feeding in multiple effect evaporation

CAchieve very high concentration of the final product

DConcentrate heat sensitive materials

Correct answer

A. Get economical temperature difference by using moderate pressure steam

Explanation

The correct answer is Get economical temperature difference by using moderate pressure steam.

3185Chemical EngineeringMedium

The general formula of naphthenes is________?

ACnHn-4

BCnH2n + 2

CSame as that for olefins i.e. CnH2n

DCnH2n-6 (where, n ≥ 6)

Correct answer

D. CnH2n-6 (where, n ≥ 6)

Explanation

The correct answer is CnH2n-6 (where, n ≥ 6).

3186Chemical EngineeringMedium

The crystal structure of most of the common metals is________?

ANone of these

BOrthorhombic

CCubic

DHexagonal

Correct answer

C. Cubic

Explanation

The correct answer is Cubic.

3187Chemical EngineeringMedium

Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around ________ metres/second?

B20

C30

D10

Correct answer

A. 1

Explanation

The correct answer is 1.

3188Chemical EngineeringMedium

Lead________?

ACannot be scratched by finger nails

BCannot be work hardened

CIs the hardest metal in common use

DIs the lightest metal in common use

Correct answer

B. Cannot be work hardened

Explanation

The correct answer is Cannot be work hardened.

3189Chemical EngineeringMedium

Which of the following flow measuring devices is an area meter?

AAnemometer

BRotameter

COrificemeter

DVenturimeter

Correct answer

B. Rotameter

Explanation

The correct answer is Rotameter.

3190Chemical EngineeringMedium

In Newton’s law range, the drag co-efficient for the motion of spherical particle in a stationary fluid is________?

A0.44

B4.4

C0.044

D44

Correct answer

A. 0.44

Explanation

The correct answer is 0.44.

Vacuum is generally maintained in the vapour space of an evaporator mainly to________?

AGet economical temperature difference by using moderate pressure steam

BFacilitate forward feeding in multiple effect evaporation

CAchieve very high concentration of the final product

DConcentrate heat sensitive materials

Correct answer

A. Get economical temperature difference by using moderate pressure steam

Explanation

The correct answer is Get economical temperature difference by using moderate pressure steam.