MCQs

Mechanical Engineering MCQs with Explanations

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861Mechanical EngineeringMedium

Heat is transferred by all three modes of transfer, viz, conduction, convection and radiation in ________?

Aelectric heater

Bboiler

Cmelting of ice

Drefrigerator condenser coils

Esteam condenser

Correct answer

B. boiler

Explanation

The correct answer is boiler.

862Mechanical EngineeringMedium

In vapor compression cycle the condition off refrigerant is dry saturated vapor________?

Abefore passing through the condenser

Bbefore entering the expansion valve

Cafter passing through the condenser

Dbefore entering the compressor

Eafter passing through the expansion or throttle valve

Correct answer

D. before entering the compressor

Explanation

The correct answer is before entering the compressor.

863Mechanical EngineeringMedium

If a number of forces act simultaneously on a particle, it is possible ________?

Ato replace them by a couple and a force

Bto replace them by a couple

Cnot a replace them by a single force

Dto replace them by a single force through C.G.

Eto replace them by a single force

Correct answer

E. to replace them by a single force

Explanation

The correct answer is to replace them by a single force.

864Mechanical EngineeringMedium

According to Bernoulli’s equation for steady ideal fluid flow________?

Anone of the above

Btotal energy is constant throughout

Cprinciple of conservation of mass holds

Dthe energy is constant along a stream-line but may vary across streamlines

Evelocity and pressure are inversely proportional

Correct answer

D. the energy is constant along a stream-line but may vary across streamlines

Explanation

The correct answer is the energy is constant along a stream-line but may vary across streamlines.

865Mechanical EngineeringMedium

Pour point of fuel oil is the________?

Atemperature at which it solidifies or congeals

Bindicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off

Ctemperature at which it flows easily

Dminimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame

Eit catches fire without external aid

Correct answer

A. temperature at which it solidifies or congeals

Explanation

The correct answer is temperature at which it solidifies or congeals.

866Mechanical EngineeringMedium

Reversed joule cycle is called________?

ABrayton cycle

BDual cycle

CCarnot cycle

DRankine cycle

EBell Coleman cycle

Correct answer

A. Brayton cycle

Explanation

The correct answer is Brayton cycle.

867Mechanical EngineeringMedium

Automobile steering gear is an example of________?

Alower pair

Bsliding pair

Chigher pair

Drotary pair

Eturning pair

Correct answer

A. lower pair

Explanation

The correct answer is lower pair.

868Mechanical EngineeringMedium

In V-belt drive, belt touches________?

Acould touch anywhere

Bnone of the above

Cat sides only

Dboth at bottom and sides

Eat bottom

Correct answer

C. at sides only

Explanation

The correct answer is at sides only.

869Mechanical EngineeringMedium

Highest pressure encountered in a refrigeration system should be________?

Amuch below critical pressure

Bcritical pressure of refrigerant

Cnear critical pressure

Dthere is no such restriction

Emuch above critical pressure

Correct answer

A. much below critical pressure

Explanation

The correct answer is much below critical pressure.

870Mechanical EngineeringMedium

The output of a diesel engine can be increased without increasing the engine revolution or size in following way________?

Aincreasing flywheel size

Bheating incoming air

Cscavenging

Dsupercharging

Efeeding more fuel

Correct answer

D. supercharging

Explanation

The correct answer is supercharging.

In vapor compression cycle the condition off refrigerant is dry saturated vapor________?

Abefore passing through the condenser

Bbefore entering the expansion valve

Cafter passing through the condenser

Dbefore entering the compressor

Eafter passing through the expansion or throttle valve

Correct answer

D. before entering the compressor

Explanation

The correct answer is before entering the compressor.

If a number of forces act simultaneously on a particle, it is possible ________?

Ato replace them by a couple and a force

Bto replace them by a couple

Cnot a replace them by a single force

Dto replace them by a single force through C.G.

Eto replace them by a single force

Correct answer

E. to replace them by a single force

Explanation

The correct answer is to replace them by a single force.

According to Bernoulli’s equation for steady ideal fluid flow________?

Anone of the above

Btotal energy is constant throughout

Cprinciple of conservation of mass holds

Dthe energy is constant along a stream-line but may vary across streamlines

Evelocity and pressure are inversely proportional

Correct answer

D. the energy is constant along a stream-line but may vary across streamlines

Explanation

The correct answer is the energy is constant along a stream-line but may vary across streamlines.

Pour point of fuel oil is the________?

Atemperature at which it solidifies or congeals

Bindicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off

Ctemperature at which it flows easily

Dminimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame

Eit catches fire without external aid

Correct answer

A. temperature at which it solidifies or congeals

Explanation

The correct answer is temperature at which it solidifies or congeals.