mechanical engineering MCQs – Page 122

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 Review each marked answer and report any item that may be outdated or unclear.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

2421. A chain comprises of 5 links having 5 joints. Is it kinematic chain ?
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A. data are insufficient to determine it

B. unpredictable

C. it is a marginal case

D. no

E. yes

2422. Sense of tangential acceleration of a link_________________?
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A. none of the above

B. is opposite to that of velocity

C. could be either same or opposite to velocity

D. is same as that of velocity

E. is perpendicular to that of velocity

2423. A foot step bearing and rotor of a vertical turbine form examples of___________________?
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A. none of the above

B. partially constrained motion

C. successfully constrained motion

D. incompletely constrained motion

E. completely constrained motion

2424. Rectilinear motion of piston is converted into rotary by_______________?
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A. cross head

B. connecting rod

C. gudgeon pin

D. four bar chain mechanism

E. slider crank

2425. The number of links and instantaneous centers in a reciprocating engine mechanism are ___________________?
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A. 4, 6

B. 5, 4

C. 6, 4

D. 4, 5

E. 4, 4

2426. Cam angle is defined as the angle_________________?
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A. through which, the cam rotates during the period in which the follower remains in the highest position

B. during which the follower returns to its initial position

C. moved by the can from beginning of i ascent to the termination of descent

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

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

2427. In higher pair, the relative motion is_____________________?
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A. purely turning

B. purely sliding

C. purely rotary

D. purely surface contact

E. combination of sliding and turning

2428. The type of pair formed by two elements which are so connected that one is constrained to turn or revolve about a fixed axis of another element is known as__________________?
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A. spherical pair

B. turning pair

C. rolling pair

D. lower pair

E. sliding pair

2429. It is required to connect two parallel shafts, the distance between whose axes is small and variable. The shafts are coupled by_______________?
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A. knuckle joint

B. Oldhams coupling

C. flexible coupling

D. universal joint

E. electromagnetic coupling

2430. In automobiles the power is transmitted from gear box to differential through _________________?
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A. Hookes joint

B. universal joint

C. bevel gear

D. Knuckle joint

E. Oldhams coupling

2431. For simple harmonic motion of the of follower, a cosine curve represents___________________?
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A. velocity diagram

B. all of the above

C. displacement diagram

D. none of the above

E. acceleration diagram

2432. Lower pairs are those which have___________________?
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A. two elements that permit relative motion

B. surface contact between the two elements when in motion

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

D. none of the above

E. elements of pairs not -held together mechanically

2433. Inertia force acts___________________?
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A. along the direction of accel* force

B. none of the above

C. opposite to the direction of ace ing force

D. perpendicular to the accel< force

E. in any direction w.r.t. accel* force depending on the magnit two

2434. Cam size depends upon__________________?
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A. prime circle

B. base circle

C. none of the above

D. pitch circle

E. outer circle

2435. In S.H.M., acceleration is proportional to _________________?
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A. velocity

B. all of the above

C. displacement

D. rate of change of velocity

E. none of the above

2436. The maximum value of the pressure angle in case of cam is kept as________________?
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A. 30

B. 14

C. 20

D. 25.

E. 10

2437. The Bifilar suspension method is used to determine__________________?
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A. position of balancing weights

B. moment of inertia

C. centripetal acceleration

D. natural frequency of vibration

E. angular acceleration of a body

2438. Two systems shall be dynamically equivalent when____________________?
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A. M.I. of two about an axis through e.g. is equal

B. all of the above

C. e.g. of two coincides

D. the mass of two are same

E. none of the above

2439. Kleins construction gives a graphica construction for________________?
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A. acceleration polygon

B. angular acceleration

C. velocity polygon

D. slider-crank mechanism

E. four bar chain mechanism

2440. For the same lift and same angle of ascent, a smaller base circle will give_______________?
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A. none of the above is true

B. a small value of pressure angle

C. something else

D. there is no such relation with pressure angle

E. a large value of pressure angle

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