Theory of machines problems
- 1. In a vibrating system, if the actual damping coefficient is 40 N/m/s and critical damping coefficient is 420 N/m/s, then logarithmic decrement is equal to
Options- A. 0.2
- B. 0.4
- C. 0.6
- D. 0.8 Discuss
Correct Answer: 0.6
- 2. When a body moves with simple harmonic motion, the product of its periodic time and frequency is equal to
Options- A. zero
- B. one
- C. ?/2
- D. ? Discuss
Correct Answer: one
- 3. In vibration isolation system, the transmissibility will be equal to unity, for all values of damping factor, if ?/?n is
Options- A. equal to one
- B. equal to 2
- C. less than 2
- D. greater than 2 Discuss
Correct Answer: equal to 2
- 4. For high speed engines, the cam follower should move with
Options- A. uniform velocity
- B. simple harmonic motion
- C. uniform acceleration and retardation
- D. cycloidal motion Discuss
Correct Answer: cycloidal motion
- 5. The rotor of a ship rotates in clockwise direction when viewed from stern and the ship takes a right turn. The effect of gyroscopic couple acting on it will be to raise the stern and lower the bow.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Agree
- 6. For a twin cylinder V-engine, the crank positions for primary reverse cranks and secondary direct cranks are shown in the below figure. The engine is a
Options- A. 30° V-engine
- B. 60° V-engine
- C. 120° V-engine
- D. 150° V-engine Discuss
Correct Answer: 30° V-engine
- 7. The steering of a ship means
Options- A. movement of a complete ship up and down in vertical plane about transverse axis
- B. turning of a complete ship in a curve towards right or left, while it moves forward
- C. rolling of a complete ship side-ways
- D. none of the above Discuss
Correct Answer: turning of a complete ship in a curve towards right or left, while it moves forward
- 8. The radial distance of a tooth from the pitch circle to the bottom of the tooth is called
Options- A. dedendum
- B. addendum
- C. clearance
- D. working depth Discuss
Correct Answer: dedendum
- 9. When the axes of the shafts, over which the gears are mounted, move relative to a fixed axis, then the train is known as reverted gear train.
Options- A. Right
- B. Wrong Discuss
Correct Answer: Wrong
- 10. The partial balancing of reciprocating parts in locomotives produces
Options- A. hammer blow
- B. swaying couple
- C. variation in tractive force along the line of stroke
- D. all of the above Discuss
Correct Answer: all of the above
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