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Mechanical Engineering MCQs with Explanations

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2101Mechanical EngineeringMedium

The air-fuel ratio in petrol engines-is controlled by________?

Acarburettion

Binjection

Cscavenging and supercharging

Dcontrolling valve opening/closing

Egoverning

Correct answer

A. carburettion

Explanation

The correct answer is carburettion.

2102Mechanical EngineeringMedium

A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is________?

Anone of the above

Bless

Csame

Dthere is no such criterion

Emore

Correct answer

E. more

Explanation

The correct answer is more.

2103Mechanical EngineeringMedium

In a mechanism, usually one link is fixed. If the fixed link is changed in a kinematic chain, then relative motion of other links________?

Awill change

Bnone of the above

Ccould change or remain unaltered depending oh which link is fixed

Dwill not occur

Ewill remain same

Correct answer

E. will remain same

Explanation

The correct answer is will remain same.

2104Mechanical EngineeringMedium

The total energy released in fission of U is________?

A168 MeV

B5 MeV

C199 MeV

D10 MeV

E11 MeV

Correct answer

C. 199 MeV

Explanation

The correct answer is 199 MeV.

2105Mechanical EngineeringMedium

The value of the product of molecular weight and the gas characteristic constant for all the gases in M.K.S. unit is________?

A848kgfm/mol°K

B29.27 kgfm/mol°K

C427kgfm/mol°K

D8314kgfm/mol°K

E735 kgfm/mol°K

Correct answer

A. 848kgfm/mol°K

Explanation

The correct answer is 848kgfm/mol°K.

2106Mechanical EngineeringMedium

Which of the following is the heaviest________?

Anucleus

Belectron

Cneutron

Dproton

Eatom

Correct answer

E. atom

Explanation

The correct answer is atom.

2107Mechanical EngineeringMedium

Rotameter is a device used to measure________?

Avelocity of air

Babsolute pressure

Cvelocity of fluid

Dflow

Erotation

Correct answer

D. flow

Explanation

The correct answer is flow.

2108Mechanical EngineeringMedium

Isothermal compression efficiency, even when running at high speed, can be approached by using A. multi-stage compression B. cold water spray C. both A. and B. above D. fully insulating the cylinder E. high stroke________?

Amulti-stage compression

Bboth A. and B. above

Ccold water spray

Dfully insulating the cylinder

Ehigh stroke

Correct answer

B. both A. and B. above

Explanation

The correct answer is both A. and B. above.

2109Mechanical EngineeringMedium

Open cycle gas turbine works on________?

ABrayton or Atkinson cycle

BJoule cycle

CErricsson cycle

DCarnot cycle

Correct answer

A. Brayton or Atkinson cycle

Explanation

The correct answer is Brayton or Atkinson cycle.

2110Mechanical EngineeringMedium

A point on a link connecting double slider crank chain traces a________?

Aparabola

Bellipse

Ccircle

Dstraight line

Ehyperbola

Correct answer

B. ellipse

Explanation

The correct answer is ellipse.

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