Study & Learn

Mechanical Engineering MCQs with Explanations

Read every question, see the correct answer, and understand the explanation at your own pace. Study mode has no timer and no negative marking.

12%

260 of 2,110MCQs reviewed

Study Mode — explanations are always visiblePrefer a timed quiz? Start test

261Mechanical EngineeringMedium

In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to________?

Acollect liquid refrigerant and prevent it from going to compressor

Bcollect vapours

Cdetect liquid in vapour

Dincrease refrigeration effect

Esuperheat the vapour

Correct answer

A. collect liquid refrigerant and prevent it from going to compressor

Explanation

The correct answer is collect liquid refrigerant and prevent it from going to compressor.

262Mechanical EngineeringMedium

The intensity of stress which causes unit strain is called________?

Amodulus of rigidity

Bbulk modulus

Cmodulus of elasticity

Dunit stress

Eprincipal stress

Correct answer

C. modulus of elasticity

Explanation

The correct answer is modulus of elasticity.

263Mechanical EngineeringMedium

In regenerator type heat exchanger, heat transfer takes place by________?

Ageneration of heat again and again

Bflow of hot and cold fluids alternately over a surface

Cdirect mixing of hot and cold fluids

Dindirect transfer

Ea complete separation between hot and cold fluids

Correct answer

B. flow of hot and cold fluids alternately over a surface

Explanation

The correct answer is flow of hot and cold fluids alternately over a surface.

264Mechanical EngineeringMedium

02 content in atmospheric air on volume basis is________?

A70%

B30%

C40%

D21%

E23%

Correct answer

D. 21%

Explanation

The correct answer is 21%.

265Mechanical EngineeringMedium

The technique for establishing and maintaining priorities among the various jobs of any project is known as________?

Aevent flow scheduling technique

Bshort interval scheduling

Cslotting technique for scheduling

Dnone of the above

Ecritical ratio scheduling

Correct answer

E. critical ratio scheduling

Explanation

The correct answer is critical ratio scheduling.

266Mechanical EngineeringMedium

Saving of work done and power by fitting an air vessel to double acting reciprocating pump is of the order of________?

A84.8%

B39.2%

C68.8%

D49.2%

E91.6%.

Correct answer

B. 39.2%

Explanation

The correct answer is 39.2%.

267Mechanical EngineeringMedium

Pitch point on a cam is________?

Athe point on cam pitch curve having the maximum pressure angle

Bnone of the above

Cany point on pitch curve

Dthe point on cam pitch curve having the minimum pressure angle

Eany point on pitch circle

Correct answer

A. the point on cam pitch curve having the maximum pressure angle

Explanation

The correct answer is the point on cam pitch curve having the maximum pressure angle.

268Mechanical EngineeringMedium

A heat exchange process in which the product of pressure and volume remains constant is known as________?

Ahyperbolic process

Bheat exchange process

Cadiabatic process

Dthrottling process

Eisentropic process

Correct answer

A. hyperbolic process

Explanation

The correct answer is hyperbolic process.

269Mechanical EngineeringMedium

The air entry velocity m a rocket as compared to aircraft is________?

Aless

Bzero

Csame

Ddependent on power and speed

Emore

Correct answer

B. zero

Explanation

The correct answer is zero.

270Mechanical EngineeringMedium

Pick up the incorrect statement from the following?

AThe C.G. of a triangle is at the intersection of its medians

BThe C.G. of a circle is at its center

CThe C-G. of an ellipse is at its center

DThe C.G. of a rectangle is at the inter-section of its diagonals

EThe C.G. of a semicircle is at a distance of r/2 from the center

Correct answer

E. The C.G. of a semicircle is at a distance of r/2 from the center

Explanation

The correct answer is The C.G. of a semicircle is at a distance of r/2 from the center.

In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to________?

Acollect liquid refrigerant and prevent it from going to compressor

Bcollect vapours

Cdetect liquid in vapour

Dincrease refrigeration effect

Esuperheat the vapour

Correct answer

A. collect liquid refrigerant and prevent it from going to compressor

Explanation

The correct answer is collect liquid refrigerant and prevent it from going to compressor.

In regenerator type heat exchanger, heat transfer takes place by________?

Ageneration of heat again and again

Bflow of hot and cold fluids alternately over a surface

Cdirect mixing of hot and cold fluids

Dindirect transfer

Ea complete separation between hot and cold fluids

Correct answer

B. flow of hot and cold fluids alternately over a surface

Explanation

The correct answer is flow of hot and cold fluids alternately over a surface.

Pitch point on a cam is________?

Athe point on cam pitch curve having the maximum pressure angle

Bnone of the above

Cany point on pitch curve

Dthe point on cam pitch curve having the minimum pressure angle

Eany point on pitch circle

Correct answer

A. the point on cam pitch curve having the maximum pressure angle

Explanation

The correct answer is the point on cam pitch curve having the maximum pressure angle.

Pick up the incorrect statement from the following?

AThe C.G. of a triangle is at the intersection of its medians

BThe C.G. of a circle is at its center

CThe C-G. of an ellipse is at its center

DThe C.G. of a rectangle is at the inter-section of its diagonals

EThe C.G. of a semicircle is at a distance of r/2 from the center

Correct answer

E. The C.G. of a semicircle is at a distance of r/2 from the center

Explanation

The correct answer is The C.G. of a semicircle is at a distance of r/2 from the center.