Discussion
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- Question
If ?/?n = 2, where co is the frequency of excitation and ?n is the natural frequency of vibrations, then the transmissibility of vibration will the
Options- A. 0.5
- B. 1
- C. 1.5
- D. 2
- Correct Answer
- 1
- 1. When the crank is at the inner dead centre, in a reciprocating steam engine, then the velocity of the piston will be
Options- A. minimum
- B. zero
- C. maximum
- D. none of these Discuss
- 2. In a coupling rod of a locomotive, each of the four pairs is a __________ pair.
Options- A. sliding
- B. turning
- C. rolling
- D. screw Discuss
- 3. The factor which affects the critical speed of a shaft is
Options- A. diameter of disc
- B. span of shaft
- C. eccentricity
- D. all of these Discuss
- 4. The Whitworth quick return motion mechanism is formed in a slider crank chain when the
Options- A. coupler link is fixed
- B. longest link is a fixed link
- C. slider is a fixed link
- D. smallest link is a fixed link Discuss
- 5. The gears are termed as medium velocity gears, if their peripheral velocity is
Options- A. 1 - 3 m/s
- B. 3 - 15 m/s
- C. 15 - 30 m/s
- D. 30 - 50 m/s Discuss
- 6. The gear train usually employed in clocks is a
Options- A. simple gear train
- B. reverted gear train
- C. sun and planet gear
- D. differential gear Discuss
- 7. When the relation between the controlling force (Fc) and radius of rotation (r) for a spring controlled governor is Fc = ar + b, then the governor will be
Options- A. stable
- B. unstable
- C. isochronous
- D. none of these Discuss
- 8. The static friction
Options- A. bears a constant ratio to the normal reaction between the two surfaces
- B. is independent of the area of contact, between the two surfaces
- C. always acts in a direction, opposite to that in which the body tends to move
- D. all of the above Discuss
- 9. The pair is known as a higher pair, when the relative motion between the elements of a pair is
Options- A. turning only
- B. sliding only
- C. rolling only
- D. partly turning and partly sliding Discuss
- 10. In a screw jack, the effort required to lower the load W is given by
Options- A. P = W tan(? - ?)
- B. P = W tan(? + ?)
- C. P = W tan(? - ?)
- D. P = W cos(? + ?) Discuss
Theory of machines problems
Search Results
Correct Answer: zero
Correct Answer: turning
Correct Answer: all of these
Correct Answer: coupler link is fixed
Correct Answer: 3 - 15 m/s
Correct Answer: reverted gear train
Correct Answer: unstable
Correct Answer: all of the above
Correct Answer: partly turning and partly sliding
Correct Answer: P = W tan(? - ?)
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