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Mechanical Engineering MCQs with Explanations

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291Mechanical EngineeringMedium

The saturation temperature of steam with increase in pressure increases________?

Aslowly first and then rapidly

Blinearly

Cinversely

Dnone of the above

Erapidly first and then slowly

Correct answer

E. rapidly first and then slowly

Explanation

The correct answer is rapidly first and then slowly.

292Mechanical EngineeringMedium

In petrol engine using a fixed octane rating fuel and fixed compression ratio, super charging will________?

Aunpredictable

Bincrease the knocking tendency

Cdecrease the knocking tendency

Dnot affect the knocking tendency

Eincrease or decrease knocking tendency depending on strength and time of spark

Correct answer

B. increase the knocking tendency

Explanation

The correct answer is increase the knocking tendency.

293Mechanical EngineeringMedium

A force acting on a body may________?

Aall of the above

Bretard its motion

Cbalance the other forces acting on it

Dintroduce internal stresses

Echange its motion

Correct answer

A. all of the above

Explanation

The correct answer is all of the above.

294Mechanical EngineeringMedium

A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will________?

Aincrease

Bremain same

Cincrease/decrease depending on depth of immersion

Ddecrease

Eunpredictable

Correct answer

B. remain same

Explanation

The correct answer is remain same.

295Mechanical EngineeringMedium

The water tubes in a babcock and wilcox boiler are________?

Ahorizontal

Binclined

Chorizontal and inclined

Dvertical and inclined

Evertical

Correct answer

B. inclined

Explanation

The correct answer is inclined.

296Mechanical EngineeringMedium

The deformation of a bar under its own weight compared to the deformation of same body subjected to a direct load equal to weight of the body is________?

Afour times

Bsame

Cdouble

Dhalf

Eone-fourth

Correct answer

D. half

Explanation

The correct answer is half.

297Mechanical EngineeringMedium

Current assets include________?

Acommon stock held by the firm

Binventories

Cmanufacturing plant

Dmanufacturing plant and equipment

Eall of the above

Correct answer

C. manufacturing plant

Explanation

The correct answer is manufacturing plant.

298Mechanical EngineeringMedium

In queuing theory, the nature of the waiting situation can be studied and analysed mathematically if________?

Aall variables and constants are known and form a linear equation

Bcomplete details’of items in, waiting line are known

Call of the above

Dthe laws governing arrivals, service times, and the order in which the arriving units are taken into source are known

Earrival and waiting times are known and can be grouped to form a waiting line model

Correct answer

D. the laws governing arrivals, service times, and the order in which the arriving units are taken into source are known

Explanation

The correct answer is the laws governing arrivals, service times, and the order in which the arriving units are taken into source are known.

299Mechanical EngineeringMedium

Mining industry usually employs following motive power________?

Acompressed air

BD.C. electric motor

CA.C. electric motor

Ddiesel engine

Epetrol engine

Correct answer

A. compressed air

Explanation

The correct answer is compressed air.

300Mechanical EngineeringMedium

High carbon content in diesel oil used for diesel engine leads to________?

Adamaging of both the storage tank and the engine

Bnone of the above.

Cexcessive engine wear

Ddeposition on engine parts

Eproduction of highly corrosive gases corroding the cylinder walls and exhaust system

Correct answer

D. deposition on engine parts

Explanation

The correct answer is deposition on engine parts.

In petrol engine using a fixed octane rating fuel and fixed compression ratio, super charging will________?

Aunpredictable

Bincrease the knocking tendency

Cdecrease the knocking tendency

Dnot affect the knocking tendency

Eincrease or decrease knocking tendency depending on strength and time of spark

Correct answer

B. increase the knocking tendency

Explanation

The correct answer is increase the knocking tendency.

In queuing theory, the nature of the waiting situation can be studied and analysed mathematically if________?

Aall variables and constants are known and form a linear equation

Bcomplete details’of items in, waiting line are known

Call of the above

Dthe laws governing arrivals, service times, and the order in which the arriving units are taken into source are known

Earrival and waiting times are known and can be grouped to form a waiting line model

Correct answer

D. the laws governing arrivals, service times, and the order in which the arriving units are taken into source are known

Explanation

The correct answer is the laws governing arrivals, service times, and the order in which the arriving units are taken into source are known.

High carbon content in diesel oil used for diesel engine leads to________?

Adamaging of both the storage tank and the engine

Bnone of the above.

Cexcessive engine wear

Ddeposition on engine parts

Eproduction of highly corrosive gases corroding the cylinder walls and exhaust system

Correct answer

D. deposition on engine parts

Explanation

The correct answer is deposition on engine parts.