mechanical engineering MCQs – Page 119

Practise multiple-choice questions from mechanical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

mechanical engineering Mcqs

1. compressors gas turbines and jet engines 2. theory of machines 3. nuclear power plants 4. engineering materials 5. strength of materials mechanical engineering 6. thermodynamics 7. heat transfer 8. i c engines 9. steam boilers engines nozzles and turbines 10. engineering mechanics 11. fluid mechanics mechanical engineering 12. production technology 13. machine design 14. hydraulic machines 15. workshop technology 16. refrigeration and air conditioning

2361. Coriolis component is encountered in_________________?
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A. slider crank mechanism

B. all of the above.

C. four bar chain mechanism

D. quick return mechanism of shaper

E. A. and C. above

2362. The Kleins method of construction for reciprocating engine mechanism _______________?
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A. is based on acceleration diagram

B. utilises a quadrilateral similar to the diagram of mechanism for reciprocating engine

C. enables determination of Coriolis component

D. is a simplified form of instantaneous center method

E. none of the above

2363. The example of higher pair is_________________?
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A. belt, rope and chain drives

B. all of the above

C. none of the above

D. gears, cams

E. ball and roller bearings

2364. If D1 and D2 be the diameters of driver and driven pulleys, then belt speed is proportional to__________________?
0

A. D1+D2

B. D1

C. D1-D2.

D. D1/D2

E. D2/D1

2365. Which of the following has sliding motion________________?
0

A. cross head guide

B. crank

C. connecting rod

D. cross-head

E. crank pin

2366. Pitch point on a cam is_________________?
0

A. none of the above

B. the point on cam pitch curve having the minimum pressure angle

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

D. any point on pitch curve

E. any point on pitch circle

2367. Kleins construction can be used when_________________?
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A. crank has uniform angular acceleration

B. crank has a uniform angular velocity

C. crank has non-uniform velocity

D. crank has uniform angular velocity and angular acceleration

E. there is no such criterion

2368. A slider crank chain consists of following numbers of turning and sliding pairs_________________?
0

A. 0, 4

B. I, 3

C. 2, 2

D. 3, 1

E. 4, 0

2369. Kinematic pairs are those which have__________________?
0

A. two elements that permit relative mo-tion

B. elements of pairs not held together mechanically

C. none of the above

D. surface contact between the two ele-ments when in motion

E. point or line contact between the two elements when in motion

2370. The tendency of a body to resist change from rest or motion is known as_______________?
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A. friction

B. inertia

C. resisting torque

D. resisting force

E. mass

2371. Angle of dwell of cam is defined as the angle________________?
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A. during which the follower returns to its initial position

B. of rotation of the cam for definite displacement of the follower

C. moved by the cam from the instant the follower begins to rise, till it reaches its highest position

D. through which the cam rotates during the period in which the follower remains in the highest position

E. moved by the cam from a beginning of ascent to the termination of descent

2372. Crowning on pulleys helps__________________?
0

A. for automatic adjustment of belt posi-tion so that belt runs centrally

B. in increasing velocity ratio

C. increase belt and pulley life

D. none of the above

E. in decreasing the slip of the belt

2373. Elements of pairs held together mechanically is known as ___________________?
0

A. rolling pair

B. none of the above

C. closed pair

D. open pair

E. mechanical pair

2374. To obviate axial thrust, following gear drive is used_____________________?
0

A. double helical gears having identical teeth

B. mutter gears

C. double helical gears having opposite teeth

D. none of the above

E. single helical gear in which one of the teeth of helix angle a is more

2375. Shaft revolving in a bearing is the following type of pair________________?
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A. spherical pair,

B. lower pair

C. higher pair

D. bearing pair

E. cylindrical pair

2376. The purpose of a link is to________________?
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A. all of the above

B. transmit motion

C. guide other links

D. act as a support

E. none of the above

2377. Governor is used in automobile to_______________?
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A. all of the above

B. decrease the variation of speed

C. to control

D. to control SN

E. none of the above

2378. Cross head and guides form a _________________?
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A. lower pair

B. higher pair

C. sliding pair

D. rolling pair

E. turning pair

2379. the chain is unconstrained when_____________?
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A. L.H.S. > R.H.S

B. L.H.S. = R.H.S

C. there is no such criterion for checking above requirement

D. L.H.S. < R.H.S

E. none of the above

2380. If some links are connected such that motion between them can take place in more than one direction, it is called_______________?
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A. partially constrained motion

B. incompletely constrained motion

C. completely constrained motion

D. successfully constrained motion

E. none of the above

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