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Mechanical Engineering MCQs with Explanations

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471Mechanical EngineeringMedium

Extensive property of a system is one whose value________?

Ais dependent on the path followed and not on the state

Bis not dependent on the path followed but on the state

Cdoes not depend on the mass of the system, like temperature, pressure, etc.

Dis always constant

Edepends on the mass of the system like volume

Correct answer

E. depends on the mass of the system like volume

Explanation

The correct answer is depends on the mass of the system like volume.

472Mechanical EngineeringMedium

The term N.T.P. stands for________?

Anormal thermodynamic practice

Bnominal temperature and pressure

Cnatural temperature and pressure

Dnormal temperature and pressure

Enormal thermodynamic pressure

Correct answer

D. normal temperature and pressure

Explanation

The correct answer is normal temperature and pressure.

473Mechanical EngineeringMedium

Pick up the wrong statement Nickel and chromium in steel help in ________?

Araising the elastic limit

Bproviding corrosion resistance

Cimproving machining properties

Dimproving the resilience and ductility

Eproviding high strength at elevated temperatures

Correct answer

C. improving machining properties

Explanation

The correct answer is improving machining properties.

474Mechanical EngineeringMedium

Which of the following manometer has highest sensitivity________?

Amicro-manometer with water

Binclined U-tube

Cdisplacement type

DU-tube with water

EU-tube with mercury

Correct answer

A. micro-manometer with water

Explanation

The correct answer is micro-manometer with water.

475Mechanical EngineeringMedium

Pick up the wrong statement?

Aturbine drives compressor in a burbojet

Bpulsojet requires no ambient air for propulsion

Cbypass turbo-jet engine increases the thrust without adversely affecting, the propulsive efficiency and fuel economy

Dramjet-engine has no turbine

Epropeller is an indirect reaction device

Correct answer

B. pulsojet requires no ambient air for propulsion

Explanation

The correct answer is pulsojet requires no ambient air for propulsion.

476Mechanical EngineeringMedium

Coefficient of friction is the________?

Athe friction force acting when the body is just about to move

Bangle between normal reaction and the resultant of normal reaction and the limiting friction

Cratio of limiting friction and normal reaction

Dtangent of angle of repose

Ethe friction force acting when the body is in motion

Correct answer

C. ratio of limiting friction and normal reaction

Explanation

The correct answer is ratio of limiting friction and normal reaction.

477Mechanical EngineeringMedium

Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged?

Ayes

Bdepends on other factors

Cunpredictable

Dno

Eto some extent

Correct answer

D. no

Explanation

The correct answer is no.

478Mechanical EngineeringMedium

Peaucellier mechanism has________?

Asix links

Bfive links

Ceight links

Dfour links

Etwelve links

Correct answer

C. eight links

Explanation

The correct answer is eight links.

479Mechanical EngineeringMedium

A centrifugal compressor works on the principle of________?

Agenerating pressure directly

Bconversion of kinetic energy into pres¬sure energy

Ccentripetal action

Dcombination of A. and D.

Econversion of pressure energy into kinetic energy

Correct answer

B. conversion of kinetic energy into pres¬sure energy

Explanation

The correct answer is conversion of kinetic energy into pres¬sure energy.

480Mechanical EngineeringMedium

In higher pair, the relative motion is________?

Apurely turning

Bcombination of sliding and turning

Cpurely surface contact

Dpurely rotary

Epurely sliding

Correct answer

B. combination of sliding and turning

Explanation

The correct answer is combination of sliding and turning.

Extensive property of a system is one whose value________?

Ais dependent on the path followed and not on the state

Bis not dependent on the path followed but on the state

Cdoes not depend on the mass of the system, like temperature, pressure, etc.

Dis always constant

Edepends on the mass of the system like volume

Correct answer

E. depends on the mass of the system like volume

Explanation

The correct answer is depends on the mass of the system like volume.

Pick up the wrong statement?

Aturbine drives compressor in a burbojet

Bpulsojet requires no ambient air for propulsion

Cbypass turbo-jet engine increases the thrust without adversely affecting, the propulsive efficiency and fuel economy

Dramjet-engine has no turbine

Epropeller is an indirect reaction device

Correct answer

B. pulsojet requires no ambient air for propulsion

Explanation

The correct answer is pulsojet requires no ambient air for propulsion.

Coefficient of friction is the________?

Athe friction force acting when the body is just about to move

Bangle between normal reaction and the resultant of normal reaction and the limiting friction

Cratio of limiting friction and normal reaction

Dtangent of angle of repose

Ethe friction force acting when the body is in motion

Correct answer

C. ratio of limiting friction and normal reaction

Explanation

The correct answer is ratio of limiting friction and normal reaction.

A centrifugal compressor works on the principle of________?

Agenerating pressure directly

Bconversion of kinetic energy into pres¬sure energy

Ccentripetal action

Dcombination of A. and D.

Econversion of pressure energy into kinetic energy

Correct answer

B. conversion of kinetic energy into pres¬sure energy

Explanation

The correct answer is conversion of kinetic energy into pres¬sure energy.