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Mechanical Engineering MCQs with Explanations

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1731Mechanical EngineeringMedium

During storage, the heating value of coal ________?

Adecreases

Bmay increase or decrease depending upon the method of storage

Cnone of the above

Dremains constant

Eincreases

Correct answer

A. decreases

Explanation

The correct answer is decreases.

1732Mechanical EngineeringMedium

Forces are called coplanar when all of them acting on body lie in ________?

Adifferent planes

Bone point

Cone plane

Dperpendicular planes

Edifferent points

Correct answer

C. one plane

Explanation

The correct answer is one plane.

1733Mechanical EngineeringMedium

It is required to produce large amount of steam at low pressure. Which boiler should be used?

Astoker fired boiler

Bcochran boiler

Cpulverised fuel fired boiler

Dbabcock and wilcox boiler

Elancashire boiler

Correct answer

E. lancashire boiler

Explanation

The correct answer is lancashire boiler.

1734Mechanical EngineeringMedium

A non-yielding support implies that the________?

Aslope of the beam at the support is zero

Bsupport can take any amount of reaction

Csupport is frictionless

Dnone of the above

Esupport holds member firmly

Correct answer

A. slope of the beam at the support is zero

Explanation

The correct answer is slope of the beam at the support is zero.

1735Mechanical EngineeringMedium

Hydraulic accumulator is used for________?

Agenerally high pressures to operate hydraulic machines

Bsupplying energy when main supply fails

Caccumulating oil

Dsupplying large quantities of oil for very short duration

Eaccumulating hydraulic energy

Correct answer

B. supplying energy when main supply fails

Explanation

The correct answer is supplying energy when main supply fails.

1736Mechanical EngineeringMedium

A manufacturer claims to have a heat engine capable of developing 20 h.p. by receiving heat input of 400 kcal/mt and working between the temperature limits of 227° C and 27° C. His claim is________?

Acost will be very high

Btheroretically possible

Cjustified

Dnot possible

Emay be possible with lot of sophistications

Correct answer

D. not possible

Explanation

The correct answer is not possible.

1737Mechanical EngineeringMedium

the chain is unconstrained when________?

Athere is no such criterion for checking above requirement

Bnone of the above

CL.H.S. = R.H.S

Correct answer

C. L.H.S. = R.H.S

Explanation

The correct answer is L.H.S. = R.H.S.

1738Mechanical EngineeringMedium

In triggering fission, the following types of neutrons are desirable________?

Aneutrons at rest

Bnone of the above

Ccritical neutrons

Dfast moving

Eslow moving

Correct answer

E. slow moving

Explanation

The correct answer is slow moving.

1739Mechanical EngineeringMedium

Resilience of a material is considered when it is subjected to________?

Afatigue

Bcreep

Cshock loading

Dfrequent heat treatment

Eresonant condition

Correct answer

C. shock loading

Explanation

The correct answer is shock loading.

1740Mechanical EngineeringMedium

Angle of action of cam is defined as the angle ________?

Aof rotation of the cam for a definite displacement of the follower

Bmoved by the cam from beginning of ascent to the termination of descent

Cduring which the follower returns to its initial position

Dthrough which the cam rotates during the period in which the follower remains in the highest position

Emoved by the cam from the instant the follower begins to rise, till it reaches its highest position

Correct answer

B. moved by the cam from beginning of ascent to the termination of descent

Explanation

The correct answer is moved by the cam from beginning of ascent to the termination of descent.

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