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Mechanical Engineering MCQs with Explanations

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181Mechanical EngineeringMedium

Violent sound pulsations within the cylinder of an I.C. engine are caused due to________?

Adetonation

Bheavy supercharging

Cheavy turbulence

Dpreignition

Eimproved scavenging

Correct answer

A. detonation

Explanation

The correct answer is detonation.

182Mechanical EngineeringMedium

Non uniform flow occurs when________?

Athe fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

Bthe velocity of successive fluid particles, at any point, is the same at successive periods of time

Cthe magnitude aricf direction of the velocity do not change from point to point in the fluid

Dthe direction and magnitude of the velocity at all points are identical

Evelocity, depth, pressure, etc. change from point to point in the fluid flow

Correct answer

E. velocity, depth, pressure, etc. change from point to point in the fluid flow

Explanation

The correct answer is velocity, depth, pressure, etc. change from point to point in the fluid flow.

183Mechanical EngineeringMedium

Alkaline pyrogallate is used in Orsat’s apparatus for absorption of ________?

A02

BCO

CN2

DC02

Enone of the above

Correct answer

A. 02

Explanation

The correct answer is 02.

184Mechanical EngineeringMedium

Travel charts provide________?

Aa compact estimate of the handling which must be done between various work sections

Ban idea of the flow of materials at various stages

Cthe information for changes required in rearranging material handling equipment

Dan approximate estimate of the handling which must be done at a particular station

Esolution to handling techniques to achieve most optimum^ results

Correct answer

A. a compact estimate of the handling which must be done between various work sections

Explanation

The correct answer is a compact estimate of the handling which must be done between various work sections.

185Mechanical EngineeringMedium

When crude oil is heated, then which of the following hydrocarbon is given off first________?

Aparaffin

Bgasoline

Cnatural gas

Ddiesel

Ekerosene

Correct answer

C. natural gas

Explanation

The correct answer is natural gas.

186Mechanical EngineeringMedium

Applications in which stresses are encountered in one direction only uses following type of threads________?

Ametric

BBSW

Csquare

Dacme

Ebuttress

Correct answer

E. buttress

Explanation

The correct answer is buttress.

187Mechanical EngineeringMedium

When a nut is tightened by plaping a washer below it, the bolt will be subjected to following type of loads________?

Atension

Bcombined loads

Ccompression

Dshear

Eall of the above

Correct answer

A. tension

Explanation

The correct answer is tension.

188Mechanical EngineeringMedium

The Scott-Russell mechanism consists of________?

Asliding and turning pairs

Bsliding and rotary pairs

Cturning pairs only

Dturning and rotary pairs

Esliding pairs only

Correct answer

A. sliding and turning pairs

Explanation

The correct answer is sliding and turning pairs.

189Mechanical EngineeringMedium

Carbonation of coal is the process of________?

Apulverising coal in inert atmosphere

Bheating wood in a limited supply of air at temperatures below 300°C

Cenriching carbon in the coal

Dbinding the pulverised coal into brick-ettes

Estrongly heating coal continuously for about 48 hours in the absence of air in a closed vessel

Correct answer

E. strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel

Explanation

The correct answer is strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel.

190Mechanical EngineeringMedium

Water at pressure of 4 kg/cm2 and 160°C temperature when exposed to atmosphere will________?

Aflash i.e. get converted into steam

Bboil

Ccool down

Dremain as it was

Enone of the above

Correct answer

A. flash i.e. get converted into steam

Explanation

The correct answer is flash i.e. get converted into steam.

Non uniform flow occurs when________?

Athe fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane

Bthe velocity of successive fluid particles, at any point, is the same at successive periods of time

Cthe magnitude aricf direction of the velocity do not change from point to point in the fluid

Dthe direction and magnitude of the velocity at all points are identical

Evelocity, depth, pressure, etc. change from point to point in the fluid flow

Correct answer

E. velocity, depth, pressure, etc. change from point to point in the fluid flow

Explanation

The correct answer is velocity, depth, pressure, etc. change from point to point in the fluid flow.

Travel charts provide________?

Aa compact estimate of the handling which must be done between various work sections

Ban idea of the flow of materials at various stages

Cthe information for changes required in rearranging material handling equipment

Dan approximate estimate of the handling which must be done at a particular station

Esolution to handling techniques to achieve most optimum^ results

Correct answer

A. a compact estimate of the handling which must be done between various work sections

Explanation

The correct answer is a compact estimate of the handling which must be done between various work sections.

Carbonation of coal is the process of________?

Apulverising coal in inert atmosphere

Bheating wood in a limited supply of air at temperatures below 300°C

Cenriching carbon in the coal

Dbinding the pulverised coal into brick-ettes

Estrongly heating coal continuously for about 48 hours in the absence of air in a closed vessel

Correct answer

E. strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel

Explanation

The correct answer is strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel.