MCQs

Chemical Engineering MCQs with Explanations

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3631Chemical EngineeringMedium

________ test can be termed as the semi-destructive test?

ACharpy

BTorsion

CHardness

DImpact

Correct answer

C. Hardness

Explanation

The correct answer is Hardness.

3632Chemical EngineeringMedium

What is the overall transfer function (C/R) of the following block diagram if G = G1. G2. G3 and H = H1.H2?

A1/(1 + GH)

BH/(1 + GH)

CG/(1 + GH)

Correct answer

C. G/(1 + GH)

Explanation

The correct answer is G/(1 + GH).

3633Chemical EngineeringMedium

A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m2.°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be________?

ALess than that of the un-insulated steam pipe

BGreater than that for un-insulated steam pipe

CEqual to that of the un-insulated steam pipe

DLess than the steam pipe with 5 cms insulation

Correct answer

A. Less than that of the un-insulated steam pipe

Explanation

The correct answer is Less than that of the un-insulated steam pipe.

3634Chemical EngineeringMedium

Which of the following is a controlling factor in very fast heterogeneous reaction?

APressure

BHeat and mass transfer effects

CTemperature

DComposition of reactant

Correct answer

B. Heat and mass transfer effects

Explanation

The correct answer is Heat and mass transfer effects.

3635Chemical EngineeringMedium

Pick out the correct statement?

AAll A., B. and C.

BWith increase in oxygen content, moisture holding capacity of coal increases and the caking power decreases

CThe less the oxygen content, better is the coal, as it reduces the calorific value

DOxygen content decreases from lignite to bituminous coal as the coalification increases

Correct answer

A. All A., B. and C.

Explanation

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

3636Chemical EngineeringMedium

The Fourier number (defined as a.t/L2) is used in the analysis of problem involving heat transfer by________?

ANatural convection

BSteady state conduction

CForced convection

DTransient conduction

Correct answer

D. Transient conduction

Explanation

The correct answer is Transient conduction.

3637Chemical EngineeringMedium

Artificial draught produced by a fan in the furnace can be controlled by the________?

ADamper

BVariation in the pitch of fan blades

CAll A., B. and C.

DSpeed of the fan

Correct answer

C. All A., B. and C.

Explanation

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

3638Chemical EngineeringMedium

Which has the lowest Prandtl number?

AAqueous solution

BWater

CLube oil

DLiquid metal

Correct answer

D. Liquid metal

Explanation

The correct answer is Liquid metal.

3639Chemical EngineeringMedium

Which is the heaviest fuel gas out of the following?

ACarburetted water gas

BBlast furnace gas

CCoke oven gas

DWater gas

Correct answer

B. Blast furnace gas

Explanation

The correct answer is Blast furnace gas.

3640Chemical EngineeringMedium

Internal energy is independent of the ________ for an ideal gas?

APressure

BVolume

CNeither A. nor B.

DBoth A. & B.

Correct answer

D. Both A. & B.

Explanation

The correct answer is Both A. & B..

A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m2.°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be________?

ALess than that of the un-insulated steam pipe

BGreater than that for un-insulated steam pipe

CEqual to that of the un-insulated steam pipe

DLess than the steam pipe with 5 cms insulation

Correct answer

A. Less than that of the un-insulated steam pipe

Explanation

The correct answer is Less than that of the un-insulated steam pipe.

Pick out the correct statement?

AAll A., B. and C.

BWith increase in oxygen content, moisture holding capacity of coal increases and the caking power decreases

CThe less the oxygen content, better is the coal, as it reduces the calorific value

DOxygen content decreases from lignite to bituminous coal as the coalification increases

Correct answer

A. All A., B. and C.

Explanation

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