MCQs

Mechanical Engineering MCQs with Explanations

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841Mechanical EngineeringMedium

Which of the following is expected to have highest thermal conductivity________?

Awater

Bboiling water

Csteam

Dsolid ice

Emelting ice

Correct answer

D. solid ice

Explanation

The correct answer is solid ice.

842Mechanical EngineeringMedium

If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm”, the pressure at a depth of 50 m below the oil surface will be________?

A7 meters of water column

B2 meters of water column

C6 meters of water Column

D5 meters of water column

E3 meters of water column

Correct answer

C. 6 meters of water Column

Explanation

The correct answer is 6 meters of water Column.

843Mechanical EngineeringMedium

The inlet value of a four stroke cycle I.C engine remains open for nearly________?

A200°

B125°

C275°

D180°

E235°

Correct answer

E. 235°

Explanation

The correct answer is 235°.

844Mechanical EngineeringMedium

Angle of ascent of cam is defined as the angle________?

Amoved by the cam from the instant the follower begins to rise, till it reaches its highest position

Bduring which the follower returns to its initial position

Cthrough which the cam rotates during the period in which the follower remains in highest position

Dof rotation of the cam for a definite displacement of the follower

Emoved by the cam from beginning oi ascent to the termination of descent

Correct answer

A. moved by the cam from the instant the follower begins to rise, till it reaches its highest position

Explanation

The correct answer is moved by the cam from the instant the follower begins to rise, till it reaches its highest position.

845Mechanical EngineeringMedium

Pulverized fuel is used for________?

Astoker fired boilers

Bless radiation loss

Cmore calorific value

Dbetter burning

Emedium sized units

Correct answer

D. better burning

Explanation

The correct answer is better burning.

846Mechanical EngineeringMedium

Belt slip may occur due to________?

Adriving pulley too small

Bloose belt

Cheavy load

Dall of the above

Enone of the above

Correct answer

D. all of the above

Explanation

The correct answer is all of the above.

847Mechanical EngineeringMedium

The process layout is best suited where________?

Amass production is envisaged

Bspecialisation exists

Cmachines are arranged according to sequence of operation

Dfew number of non-standardised units are to be produced

Ebought out items are more

Correct answer

D. few number of non-standardised units are to be produced

Explanation

The correct answer is few number of non-standardised units are to be produced.

848Mechanical EngineeringMedium

In which of the following cases, consideration of creep is important________?

Apiston I.C. engine

Bcast iron pipes”

Ccycle chains

Dgas turbine blades

Eflywheel of steam engine

Correct answer

D. gas turbine blades

Explanation

The correct answer is gas turbine blades.

849Mechanical EngineeringMedium

Which is false statement about air receivers ________?

AThese knock out some oil and moisture

BThese act as reservoir to- take care of sudden demands

CThese are used to dampen pulsations,

DThese reduce frequent on/off operation of compressors

EThese increase compressor efficiency

Correct answer

E. These increase compressor efficiency

Explanation

The correct answer is These increase compressor efficiency.

850Mechanical EngineeringMedium

Which process will increase the fatigue duration of parts?

Aall of the above”.

Belectroplating

Cdecarburisation

Dfinishing and polishing

Eshot-peening

Correct answer

E. shot-peening

Explanation

The correct answer is shot-peening.

Angle of ascent of cam is defined as the angle________?

Amoved by the cam from the instant the follower begins to rise, till it reaches its highest position

Bduring which the follower returns to its initial position

Cthrough which the cam rotates during the period in which the follower remains in highest position

Dof rotation of the cam for a definite displacement of the follower

Emoved by the cam from beginning oi ascent to the termination of descent

Correct answer

A. moved by the cam from the instant the follower begins to rise, till it reaches its highest position

Explanation

The correct answer is moved by the cam from the instant the follower begins to rise, till it reaches its highest position.

The process layout is best suited where________?

Amass production is envisaged

Bspecialisation exists

Cmachines are arranged according to sequence of operation

Dfew number of non-standardised units are to be produced

Ebought out items are more

Correct answer

D. few number of non-standardised units are to be produced

Explanation

The correct answer is few number of non-standardised units are to be produced.

Which is false statement about air receivers ________?

AThese knock out some oil and moisture

BThese act as reservoir to- take care of sudden demands

CThese are used to dampen pulsations,

DThese reduce frequent on/off operation of compressors

EThese increase compressor efficiency

Correct answer

E. These increase compressor efficiency

Explanation

The correct answer is These increase compressor efficiency.