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Mechanical Engineering MCQs with Explanations

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301Mechanical EngineeringMedium

Inconel is an alloy of________?

Anickel, chromium and iron

Bnickel, copper

Cnickel, zinc

Dnickel, chromium

Enickel, lead

Correct answer

A. nickel, chromium and iron

Explanation

The correct answer is nickel, chromium and iron.

302Mechanical EngineeringMedium

100% efficiency of a thermal cycle cannot be achieved because of ________?

Aleakage

Bnone of the above

Cnon-availability of ideal substance

Dit is not possible to achieve 0°K temperature

Efrictional losses

Correct answer

D. it is not possible to achieve 0°K temperature

Explanation

The correct answer is it is not possible to achieve 0°K temperature.

303Mechanical EngineeringMedium

In detennining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than________?

Athree members with known forces of the frame

Bfour members with unknown forces of the frame

Cfour members with two known forces

Dtwo members with unknown forces of the frame

Ethree members with unknown forces of the frame

Correct answer

E. three members with unknown forces of the frame

Explanation

The correct answer is three members with unknown forces of the frame.

304Mechanical EngineeringMedium

If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of________?

B81

D27

Correct answer

B. 81

Explanation

The correct answer is 81.

305Mechanical EngineeringMedium

Centrifugal pump is started with its delivery valve ________?

Airrespective of any position

Bkept fully closed

Cnone of the above

Dkept 50% open

Ekept fully open

Correct answer

B. kept fully closed

Explanation

The correct answer is kept fully closed.

306Mechanical EngineeringMedium

The property of a material by virtue of which a body returns to its original, shape after removal of the load is called________?

Aelasticity

Bmalleability

Cresilience

Dplasticity

Eductility

Correct answer

A. elasticity

Explanation

The correct answer is elasticity.

307Mechanical EngineeringMedium

If a material fails below its yield point, failure would be due to________?

Astraining

Bfatigue

Ccreep

Dimpact loading

Esudden loading

Correct answer

B. fatigue

Explanation

The correct answer is fatigue.

308Mechanical EngineeringMedium

Clapeyron equation is applicable for registration at________?

Asaturation point of vapor

Btriple point

Csublimation temperature

Dcritical point

Esaturation point of liquid

Correct answer

A. saturation point of vapor

Explanation

The correct answer is saturation point of vapor.

309Mechanical EngineeringMedium

Emergency rush order can be pushed more effectively in________?

Anone of the above

Bautomatic production

Cjob production

Dcontinuous production

Eintermittent production

Correct answer

E. intermittent production

Explanation

The correct answer is intermittent production.

310Mechanical EngineeringMedium

Ductile cast iron________?

Ais produced by annealing process. It is soft, tough and easily machined metal

Bis also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

Ccontains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron

Dnone of the above

Eis produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

Correct answer

E. is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

Explanation

The correct answer is is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material.

In detennining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than________?

Athree members with known forces of the frame

Bfour members with unknown forces of the frame

Cfour members with two known forces

Dtwo members with unknown forces of the frame

Ethree members with unknown forces of the frame

Correct answer

E. three members with unknown forces of the frame

Explanation

The correct answer is three members with unknown forces of the frame.

Ductile cast iron________?

Ais produced by annealing process. It is soft, tough and easily machined metal

Bis also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

Ccontains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron

Dnone of the above

Eis produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

Correct answer

E. is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

Explanation

The correct answer is is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material.