MCQs

Mechanical Engineering MCQs with Explanations

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981Mechanical EngineeringMedium

The state of vapour under saturation condition is described by________?

Apressure and temperature

Btemperature alone

Cdryness fraction alone

Dpressure and dryness fraction

Epressure alone

Correct answer

D. pressure and dryness fraction

Explanation

The correct answer is pressure and dryness fraction.

982Mechanical EngineeringMedium

Pipes for bicycle frames are made of________?

Acast steel

Bforged steel

Ccold rolled steel

Dhot rolled steel

Ecarbon-chrome steel

Correct answer

C. cold rolled steel

Explanation

The correct answer is cold rolled steel.

983Mechanical EngineeringMedium

In a refrigeration system, heat absorbed in comparison to heat rejected is________?

Aless for small capacity and more for high capacity

Bsame

Cmore

Dless

Emore for small capacity and less for high capacity

Correct answer

D. less

Explanation

The correct answer is less.

984Mechanical EngineeringMedium

Which of the following do not have identical dimensions?

ATorque and energy

BMomentum and impulse

CKinetic energy and potential energy

DTorque and work

EMoment of a force and angular momentum

Correct answer

E. Moment of a force and angular momentum

Explanation

The correct answer is Moment of a force and angular momentum.

985Mechanical EngineeringMedium

In heat transfer, conductance equals conductivity (kcal/hr/sqm/°C/cm) divided by ________?

A°C (temperature)

Bhr (time)

Ckcal (heat).

Dsqm (area)

Ecm (thickness)

Correct answer

E. cm (thickness)

Explanation

The correct answer is cm (thickness).

986Mechanical EngineeringMedium

Hard coke is produced by carborisation of coal at________?

A70O-850°C

B95O-1100°C

C500-600°C

D120O-1500°C

Eatmospheric temperature

Correct answer

B. 95O-1100°C

Explanation

The correct answer is 95O-1100°C.

987Mechanical EngineeringMedium

The more effective way of increasing efficiency of Carnot engine is to________?

Aincrease higher temperature

Bdecrease higher temperature

Cdecrease lower temperature

Dincrease lower temperature

Ekeep lower temperature constant

Correct answer

C. decrease lower temperature

Explanation

The correct answer is decrease lower temperature.

988Mechanical EngineeringMedium

On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be________?

Azero at its upper end

Bnone of the above

Cdownwards at its upper end

Dupwards at its upper end

Eperpendicular to the wall at its upper end

Correct answer

A. zero at its upper end

Explanation

The correct answer is zero at its upper end.

989Mechanical EngineeringMedium

Brayton cycle consists’ of following four processes________?

Atwo isentropics, one constant volume and one constant pressure

Btwo isentropics and two constant pres-sures

Ctwo isothermals and two isentropics

Dtwo isentropics and two constant volumes

Enone of the above

Correct answer

B. two isentropics and two constant pres-sures

Explanation

The correct answer is two isentropics and two constant pres-sures.

990Mechanical EngineeringMedium

In order to prevent formation of carbon on the injector, the temperature of nozzle tip should be________?

Abetween 100-250°C

Bbetween 250 – 300°C

Cbetween 400 – 500°C

Dbetween 500 – 1000°C

Eless than 100°C

Correct answer

B. between 250 – 300°C

Explanation

The correct answer is between 250 – 300°C.

Brayton cycle consists’ of following four processes________?

Atwo isentropics, one constant volume and one constant pressure

Btwo isentropics and two constant pres-sures

Ctwo isothermals and two isentropics

Dtwo isentropics and two constant volumes

Enone of the above

Correct answer

B. two isentropics and two constant pres-sures

Explanation

The correct answer is two isentropics and two constant pres-sures.