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Mechanical Engineering MCQs with Explanations

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2091Mechanical EngineeringMedium

Pick up the false statement?

AThermal efficiency of diesel engine i about 34%

BTheoretically correct mixture of air am petrol is approximately 15 : 1

CDiesel engines are compression ignition engines

DHigh speed compression engines operate on dual combustion cycle

ES.I. engines are quality-governed engines

Correct answer

E. S.I. engines are quality-governed engines

Explanation

The correct answer is S.I. engines are quality-governed engines.

2092Mechanical EngineeringMedium

Fuel consumption with increase in back pressure will________?

Aremain unaffected

Bdecrease

Cdepend on other factors

Dincrease

Enone of the above

Correct answer

D. increase

Explanation

The correct answer is increase.

2093Mechanical EngineeringMedium

The alloy used for making electrical resistances and heating elements is________?

Aelinvar

Bmagnin

Cinvar

Dpeiminvar

Enichrome

Correct answer

E. nichrome

Explanation

The correct answer is nichrome.

2094Mechanical EngineeringMedium

Material handling in automobile industry is done by________?

Atrolley

Boverhead crane

Cbelt conveyor

Dnone of the above

Eall of the above

Correct answer

B. overhead crane

Explanation

The correct answer is overhead crane.

2095Mechanical EngineeringMedium

White metal contains________?

A63 to 67% nickel and 30% copper

Bmalleable cast iron and silver

C88% copper and 10% tin and rest zinc

Dsilver and chromium

Ealloy of tin, lead and cadmium

Correct answer

E. alloy of tin, lead and cadmium

Explanation

The correct answer is alloy of tin, lead and cadmium.

2096Mechanical EngineeringMedium

For very great pressures, viscosity of moss gases and liquids________?

Ashows erratic behavior

Bincreases

Cremains same

Dnone of the above

Edecreases

Correct answer

A. shows erratic behavior

Explanation

The correct answer is shows erratic behavior.

2097Mechanical EngineeringMedium

The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is________?

Anone of the above

Bcould be more or less depending on other factors

Cmore

Dless

Esame

Correct answer

C. more

Explanation

The correct answer is more.

2098Mechanical EngineeringMedium

In compression, a prism of brittle material will break________?

Anone of the above

Bin direction perpendicular to application of load

Cby crushing into thousands of pieces

Dby forming a bulge (l>) by shearing along oblique plane

Correct answer

D. by forming a bulge (l>) by shearing along oblique plane

Explanation

The correct answer is by forming a bulge (l>) by shearing along oblique plane.

2099Mechanical EngineeringMedium

In which case the air-fuel ratio is likely to be maximum ________?

A2-stroke engine

Bmulti-cylinder engine

Cgas turbine

D4-stroke diesef engine

E4-stroke petrol engine

Correct answer

C. gas turbine

Explanation

The correct answer is gas turbine.

2100Mechanical EngineeringMedium

Which of the following is not the unit of energy________?

Akg m

Bkg m x (m/sec)2

Ckcal

Dwattr

Ewatt hours

Correct answer

D. wattr

Explanation

The correct answer is wattr.

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