MCQs

Mechanical Engineering MCQs with Explanations

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941Mechanical EngineeringMedium

If there are L number of links in a mechanism then number of possible inversions is equal to________?

BL + 2

CL + 1

Correct answer

A. L

Explanation

The correct answer is L.

942Mechanical EngineeringMedium

Kinematic pairs are those which have________?

Anone of the above

Bsurface contact between the two ele-ments when in motion

Ctwo elements that permit relative mo-tion

Dpoint or line contact between the two elements when in motion

Eelements of pairs not held together mechanically

Correct answer

C. two elements that permit relative mo-tion

Explanation

The correct answer is two elements that permit relative mo-tion.

943Mechanical EngineeringMedium

At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be________?

Anegative value

Bmaximum

Cminimum

Dcould be any value

Ezero

Correct answer

D. could be any value

Explanation

The correct answer is could be any value.

944Mechanical EngineeringMedium

The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately________?

A30 mm

B5 mm

C10 mm

D20 mm

E1 mm

Correct answer

A. 30 mm

Explanation

The correct answer is 30 mm.

945Mechanical EngineeringMedium

In diesel engine, the compression ratio in comparison to expansion ratio is________?

Asame

Bmore/less depending on engine capacity.

Cvariable

Dmore

Eless

Correct answer

D. more

Explanation

The correct answer is more.

946Mechanical EngineeringMedium

The overall isothermal eiffciency of compressor is defined as the ratio of________?

Aisothermal work to ideal work

Bisothermal h.p. to adiabatic h.p.

Cpower to drive compressor to isothermal h.p.

Dwork to compress air isothermally to work for actual compression

Eisothermal h.p. to the BHP of motor

Correct answer

E. isothermal h.p. to the BHP of motor

Explanation

The correct answer is isothermal h.p. to the BHP of motor.

947Mechanical EngineeringMedium

Which is correct statement?

Anone of the above

Bboth will be equally rigid

Ca member made of steel will generally be more rigid than a member of equal load-carrying ability made of cast iron

Da member made of cast iron will generally be. more rigid than a member of equal load carrying ability made of steel

Ewhich one is rigid will depend on several other factors

Correct answer

D. a member made of cast iron will generally be. more rigid than a member of equal load carrying ability made of steel

Explanation

The correct answer is a member made of cast iron will generally be. more rigid than a member of equal load carrying ability made of steel.

948Mechanical EngineeringMedium

According to Wien’s law, the wavelength corresponding to maximum energy is proportion to ________?

Babsolute temperature (T)

CI2

D1/r

Correct answer

B. absolute temperature (T)

Explanation

The correct answer is absolute temperature (T).

949Mechanical EngineeringMedium

Alcohol is used in manometers because________?

Ait is clearly visible

Bit can provide longer column due to low density

Cit has low vapour pressure

Dis provides suitable meniscus

Eit has low surface tension

Correct answer

B. it can provide longer column due to low density

Explanation

The correct answer is it can provide longer column due to low density.

950Mechanical EngineeringMedium

Depending on the radiating properties, body will be transparent when________?

Ap = 0, T= l,anda = 0

Ba = 0,x + p= 1

Cp = 0, x = 0 and a = 1

Dp=l,x = 0,anda = 0

EX = 0, a + p = 1

Correct answer

A. p = 0, T= l,anda = 0

Explanation

The correct answer is p = 0, T= l,anda = 0.

Kinematic pairs are those which have________?

Anone of the above

Bsurface contact between the two ele-ments when in motion

Ctwo elements that permit relative mo-tion

Dpoint or line contact between the two elements when in motion

Eelements of pairs not held together mechanically

Correct answer

C. two elements that permit relative mo-tion

Explanation

The correct answer is two elements that permit relative mo-tion.

The overall isothermal eiffciency of compressor is defined as the ratio of________?

Aisothermal work to ideal work

Bisothermal h.p. to adiabatic h.p.

Cpower to drive compressor to isothermal h.p.

Dwork to compress air isothermally to work for actual compression

Eisothermal h.p. to the BHP of motor

Correct answer

E. isothermal h.p. to the BHP of motor

Explanation

The correct answer is isothermal h.p. to the BHP of motor.

Which is correct statement?

Anone of the above

Bboth will be equally rigid

Ca member made of steel will generally be more rigid than a member of equal load-carrying ability made of cast iron

Da member made of cast iron will generally be. more rigid than a member of equal load carrying ability made of steel

Ewhich one is rigid will depend on several other factors

Correct answer

D. a member made of cast iron will generally be. more rigid than a member of equal load carrying ability made of steel

Explanation

The correct answer is a member made of cast iron will generally be. more rigid than a member of equal load carrying ability made of steel.

Alcohol is used in manometers because________?

Ait is clearly visible

Bit can provide longer column due to low density

Cit has low vapour pressure

Dis provides suitable meniscus

Eit has low surface tension

Correct answer

B. it can provide longer column due to low density

Explanation

The correct answer is it can provide longer column due to low density.