mechanical engineering MCQs – Page 117

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 Review each marked answer and report any item that may be outdated or unclear.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

2321. For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimidstroke respectively, is__________________?
0

A. maximum and minimum

B. maximum and zero

C. minimum and maximum

D. zero and minimum

E. zero and maximum

2322. The Scott-Russell mechanism consists of_________________?
0

A. sliding and rotary pairs

B. turning and rotary pairs

C. sliding pairs only

D. sliding and turning pairs

E. turning pairs only

2323. Angle of ascent of cam is defined as the angle___________________?
0

A. of rotation of the cam for a definite displacement of the follower

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

C. moved by the cam from beginning oi ascent to the termination of descent

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

E. during which the follower returns to its initial position

2324. A kinematic chain requires at least________________________?
0

A. 4 links and 4 turning pairs

B. none of the above

C. 3 links and 4 turning pairs

D. 2 links and 3 turning pairs

E. 5 links and 4 turning pairs

2325. The example of lower pair is_______________?
0

A. none of the above

B. shaft revolving in a bearing

C. all of the above

D. straight line motion mechanisms

E. automobile steering gear

2326. The velocity of any point in mechanism relative to any other point on the mechanism on velocity polygon is represented by the line________________?
0

A. joining the corresponding points

B. perpendicular to line as per A.

C. at 45 to line as per A.

D. none of the above

E. not possible to determine with these data

2327. Which of the following disciplines provides study of inertia forces arising from the combined effect of the mass and the motion of the parts_______________?
0

A. kinetics

B. mechanisms

C. kinematics

D. theory of machines

E. applied mechanics

2328. Which is the false statement about the properties of instantaneous center____________________?
0

A. the two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link

B. the two rigid links have no linear velocities relative to each other at the instantaneous centre

C. at the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered

D. the double centre can be denoted either by 02 or Ol2, but proper selection should be made

E. none of the above

2329. Peaucellier mechanism has__________________?
0

A. five links

B. four links

C. eight links

D. six links

E. twelve links

2330. T Jie horse power transmitted by a belt is dependent upon _________________?
0

A. tension on slack side of belt

B. all of the above

C. tension on tight side of belt

D. speed of pulley

E. radius of pulley

2331. Which of the following would constitute a link__________________?
0

A. piston, crank pin and crank shaft

B. piston, and piston rod

C. piston rod and cross head

D. piston, piston rings and gudgeon pin

E. piston, piston-rod and cross head

2332. The e.g. of a link in any mechanism would experience_________________?
0

A. no acceleration

B. linear acceleration

C. angular acceleration

D. both angular and linear accelerations

E. none of the above

2333. Which of the following is false statement in respect of differences between machine and structure___________________?
0

A. Machines transmit mechanical work, whereas structures transmit forces

B. Efficiency of machines as well as structures is below 100%

C. In machines, relative motion exists be-tween its members, whereas same does hot exist in case of structures

D. Machines modify movement and work, whereas structures modify forces

E. Machines are run by electric motors, but structures are not

2334. The type of coupling used to join two shafts whose axes are neither in same straight line nor parallel, but intersect is______________________?
0

A. Oldhams coupling

B. chain coupling

C. flexible coupling

D. universal coupling

E. American coupling

2335. Ackermann steering gear consists of_______________?
0

A. lower pairs

B. higher pairs

C. sliding pairs

D. rolling pairs

E. turning pairs

2336. the chain is constrained when_________________?
0

A. L.H.S. = R.H.S.

B. none of the above

C. L.H.S. R.H.S.

D. there is no such criterion for checking above requirement

2337. In elliptical trammels_________________?
0

A. one pair turning and three pairs sliding

B. two pairs turning and two pairs sliding

C. three pairs turning and one pair sliding

D. all four pairs sliding

E. all four pairs are turning

2338. The number of links in pantograph mechanism is equal to______________?
0

A. 5

B. 4

C. 6

D. 3

E. 2

2339. To transmit power from one rotating shaft to another whose axes are neither parallel nor intersecting, use__________________?
0

A. bevel gear

B. spiral gear

C. worm gear

D. crown gear

E. spur gear

2340. The magnitude of tangential acceleration is equal to____________________?
0

A. velocity x crank radius2

B. velocity2 x crank radius

C. velocityvcrankradius

D. none of the above

E. (velocity/crankradius)

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