MCQs

Mechanical Engineering MCQs with Explanations

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1261Mechanical EngineeringMedium

The normal stress is same in all directions at a point in a fluid________?

Airrespective of the motion of one fluid layer relative to an adjacent layer

Bin case of an ideal fluid

Conly when the fluid is incompressible and has zero viscosity

Dwhen there is no motion of one fluid layer relative to an adjacent layer

Eonly when the fluid is frictionless

Correct answer

D. when there is no motion of one fluid layer relative to an adjacent layer

Explanation

The correct answer is when there is no motion of one fluid layer relative to an adjacent layer.

1262Mechanical EngineeringMedium

The compressor capacity with decrease in suction temperature________?

Adecreases

Bincreases

Cremains unaffected

Dmay increase or decrease depending on compressor capacity

Eincreases upto certain limit and then decreases

Correct answer

B. increases

Explanation

The correct answer is increases.

1263Mechanical EngineeringMedium

Choose the wrong statement?

Ahe vertical component passes through the center of pressure of the volume

BCenter of pressure acts at a greater depth than center of gravity

CThe vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area

DThe horizontal component of the hydro-static force on any surface is equal to the normal force on the vertical projection of the surface

EThe horizontal component acts through the center of pressure for the vertical projection

Correct answer

A. he vertical component passes through the center of pressure of the volume

Explanation

The correct answer is he vertical component passes through the center of pressure of the volume.

1264Mechanical EngineeringMedium

CPMis________?

Asynthesising in concepts

Bis built of activities oriented program-mes

Cis used for repetitive works

Dis, based on one time eytimate

Eall of the above

Correct answer

E. all of the above

Explanation

The correct answer is all of the above.

1265Mechanical EngineeringMedium

Detonation is caused by the following unstable compounds________?

Anone of the above

Baldehydes, oxides and ketones

Cperoxides, aldehydes, oxides and sul-phides

Dketones and sulphur compounds

Eperoxides, aldehydes and ketones

Correct answer

E. peroxides, aldehydes and ketones

Explanation

The correct answer is peroxides, aldehydes and ketones.

1266Mechanical EngineeringMedium

If a material expands freely due to heating it will develop ________?

Acompressive stress

Btensile stress

Cno stress

Dthermal stresses

Ebending

Correct answer

C. no stress

Explanation

The correct answer is no stress.

1267Mechanical EngineeringMedium

Rectangular bar in a rectangular hole is the following type of pair________?

Afreely constrained motion

Bincompletely constrained motion

Cpartially constrained motion

Dcompletely constrained motion

Enone of the above

Correct answer

D. completely constrained motion

Explanation

The correct answer is completely constrained motion.

1268Mechanical EngineeringMedium

Depending on the radiating properties, a body will be black when________?

Aa = 0,x + p= 1.

Bp = 0, x = 1 and a = 0

Cp= l,T = 0anda = 0

Dx = 0, a + p = 0

Ep = 0, x = 0 and a = 1

Correct answer

E. p = 0, x = 0 and a = 1

Explanation

The correct answer is p = 0, x = 0 and a = 1.

1269Mechanical EngineeringMedium

Self-ignition temperature of petrol is of the order of________?

A370°C

B240°C

Cmore than 500°C.

D150°C

E450°C

Correct answer

C. more than 500°C.

Explanation

The correct answer is more than 500°C..

1270Mechanical EngineeringMedium

Which of the following meters is not associated with viscosity________?

ARed wood

BSay bolt

COrsat

Dnone of the above

EEngler

Correct answer

C. Orsat

Explanation

The correct answer is Orsat.

The normal stress is same in all directions at a point in a fluid________?

Airrespective of the motion of one fluid layer relative to an adjacent layer

Bin case of an ideal fluid

Conly when the fluid is incompressible and has zero viscosity

Dwhen there is no motion of one fluid layer relative to an adjacent layer

Eonly when the fluid is frictionless

Correct answer

D. when there is no motion of one fluid layer relative to an adjacent layer

Explanation

The correct answer is when there is no motion of one fluid layer relative to an adjacent layer.

Choose the wrong statement?

Ahe vertical component passes through the center of pressure of the volume

BCenter of pressure acts at a greater depth than center of gravity

CThe vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area

DThe horizontal component of the hydro-static force on any surface is equal to the normal force on the vertical projection of the surface

EThe horizontal component acts through the center of pressure for the vertical projection

Correct answer

A. he vertical component passes through the center of pressure of the volume

Explanation

The correct answer is he vertical component passes through the center of pressure of the volume.