Mechanical Engineering MCQs

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The mean effective pressure obtained from engine indicator indicates the________?

A.maximum pressure developed

B.minimum pressure

C.exhaust pressure

D.average pressure

E.instantaneous pressure at any instant

Submitted by: Academy of Pakistan

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Which of the following has highest specific strength of all structural materials________?

A.titanium alloys

B.magnetic steel alloys

C.none of the above

D.chromium alloys

E.magnesium alloys

Submitted by: Academy of Pakistan

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The ratio of the energy absorbed by the body to total energy falling on it is called________?

A.none of the above

B.emissivity

C.emissive power

D.absorptivity

E.absorptive power

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Breeder reactors employ liquid metal coolant because it________?

A.acts as good moderator

B.transfers heat from core at a fast rate

C.produces maximum steam

D.increases rate of reaction in core

E.breeds neutrons

Submitted by: Academy of Pakistan

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In a diesel engine, the fuel is ignited by________?

A.combustion chamber

B.spark

C.injected fuel

D.ignition

E.heat resulting from compressing air that is supplied for combustion

Submitted by: Academy of Pakistan

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Pick up the wrong statement Fast breeder reactors________?

A.operate at extremely high power densities.

B.are unmoderated

C.use water as coolant

D.produce more fuel than they consume

E.are liquid-metal cooled

Submitted by: Academy of Pakistan

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A one dimensional flow is one which________?

A.takes place in one dimension

B.takes place in straight lines

C.involves zero transverse component of flow

D.is uniform flow

E.is steady uniform flow

Submitted by: Academy of Pakistan

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Percentage reduction of area in performing tensile test on cast iron may be of the order of________?

A.15%

B.25%

C.60%.

D.0%

E.50%

Submitted by: Academy of Pakistan

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Water contained in a beaker can be made to boil by passing steam through it________?

A.at a pressure greater than atmospheric pressure

B.any pressure

C.not possible

D.at atmospheric pressure

E.at a pressure below the firuosphejric pressure

Submitted by: Academy of Pakistan

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Which of the following type of pump is used in liquid metal cooled reactor for circulation of liquid metal________?

A.electromagnetic

B.diaphragm

C.axial

D.centrifugal

E.reciprocation

Submitted by: Academy of Pakistan

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Surface tension________?

A.has no units

B.is also known as capillarity

C.decreases with fall in temperature

D.is a function of the curvature of the interface

E.acts in the plane of the interface normal to any line in the surface

Submitted by: Academy of Pakistan

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During base load operation, the best method of controlling compressor is ________?

A.constant speed unloader

B.none of the above

C.variable speed

D.start-stop motor

E.relief valve

Submitted by: Academy of Pakistan

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Castle nut is a locking device in which________?

A.a slot is cut partly is middle of nut and then slot reduced by tightening a screw

B.one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

C.none of the above.

D.a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

E.through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin spitted and bent in reverse direction at other end

Submitted by: Academy of Pakistan

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Ductility of a material can be defined as________?

A.ability to undergo large permanent deformations in compression

B.all of the above

C.ability to undergo large permanent deformations in tension

D.none of the above

E.ability to recover its original form

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Kinematic viscosity is equal to________?

A.same as dynamic viscosity

B.1/dynamicviscosity x density

C.dynamic viscosity/density

D.density/dynamic viscosity

E.dynamicviscosity x density

Submitted by: Academy of Pakistan

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Mechanical Engineering MCQs

The mean effective pressure obtained from engine indicator indicates the________?

Which of the following has highest specific strength of all structural materials________?

The ratio of the energy absorbed by the body to total energy falling on it is called________?

Breeder reactors employ liquid metal coolant because it________?

In a diesel engine, the fuel is ignited by________?

Pick up the wrong statement Fast breeder reactors________?

A one dimensional flow is one which________?

Percentage reduction of area in performing tensile test on cast iron may be of the order of________?

Water contained in a beaker can be made to boil by passing steam through it________?

Which of the following type of pump is used in liquid metal cooled reactor for circulation of liquid metal________?

Surface tension________?

During base load operation, the best method of controlling compressor is ________?

Castle nut is a locking device in which________?

Ductility of a material can be defined as________?

Kinematic viscosity is equal to________?

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