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Mechanical Engineering MCQs with Explanations

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201Mechanical EngineeringMedium

In jet engines, paraffin is usually used as the fuel because of its ________?

AA. and C. above

Bease of atomisation

Cnone of the above

Dlow freezing point

Ehigh calorific value

Correct answer

A. A. and C. above

Explanation

The correct answer is A. and C. above.

202Mechanical EngineeringMedium

As the number of cylinders in multi-cylinder engine increases, the power to weight ratio________?

AIncreases

BRemains same

CDecreases upto a limit and then increases

DDecreases

Correct answer

D. Decreases

Explanation

The correct answer is Decreases.

203Mechanical EngineeringMedium

A 5 BHP engine running at full load would consume diesel of the order of________?

A3 kg/hr

B10 kg/hr

C5 kg/hr

D0.3 kg/hr

E1 kg/hr

Correct answer

E. 1 kg/hr

Explanation

The correct answer is 1 kg/hr.

204Mechanical EngineeringMedium

If the opposite links of a four bar linkage are equal, the links will always form a________?

Arectangle

Bparallelogram

Cpentagon

Dtriangle

Etrapezoid

Correct answer

B. parallelogram

Explanation

The correct answer is parallelogram.

205Mechanical EngineeringMedium

Most of the domestic refrigerators work on the following refrigeration system ________?

Acarnot cycle

Belectrolux refrigerator

Cvapour compression

Dvapour absorption

Edual cycle

Correct answer

C. vapour compression

Explanation

The correct answer is vapour compression.

206Mechanical EngineeringMedium

Taps, dies and drills contain carbon________?

Aabove 1%

Bbelow 1%

Cabove 2.2%

Dnil

Ebelow 0.5%

Correct answer

A. above 1%

Explanation

The correct answer is above 1%.

207Mechanical EngineeringMedium

The fluid forces considered in the Navier Stokes equation are________?

Anone of the above

Bpressure, viscous and turbulent

Cgravity, pressure and turbulent

Dgravity, pressure and viscous

Egravity, viscous and turbulent

Correct answer

D. gravity, pressure and viscous

Explanation

The correct answer is gravity, pressure and viscous.

208Mechanical EngineeringMedium

In mottled cast iron, carbon is available in________?

Aflat form

Bcombined form

Cpartly in free and partly in combined state

Dfree form

Enodular form

Correct answer

C. partly in free and partly in combined state

Explanation

The correct answer is partly in free and partly in combined state.

209Mechanical EngineeringMedium

The first method invented for planning projects was________?

Aprogramme evaluation and review technique (PERT)

Bnone of the above

Ccritical path method (CPM)

Dmilestone chart

Ebar chart method

Correct answer

E. bar chart method

Explanation

The correct answer is bar chart method.

210Mechanical EngineeringMedium

In a recuperative air preheater, the heat is transferred________?

Aheat is transferred by bleeding some gases from furnace

Bby direct mixing,

Cnone of the above

Dfrom a metal wall from one medium to another

Efrom heating an itermediate material and then heating the air from this material

Correct answer

D. from a metal wall from one medium to another

Explanation

The correct answer is from a metal wall from one medium to another.

In a recuperative air preheater, the heat is transferred________?

Aheat is transferred by bleeding some gases from furnace

Bby direct mixing,

Cnone of the above

Dfrom a metal wall from one medium to another

Efrom heating an itermediate material and then heating the air from this material

Correct answer

D. from a metal wall from one medium to another

Explanation

The correct answer is from a metal wall from one medium to another.