Engineering Mechanics problems
- 1. The velocity ratio of a simple wheel and axle with D and d as the diameters of effort wheel and load axle, is
Options- A. D + d
- B. D - d
- C. D x d
- D. D / d Discuss
Correct Answer: D / d
- 2. One kg force is equal to
Options- A. 7.8 N
- B. 8.9 N
- C. 9.8 N
- D. 12 N Discuss
Correct Answer: 9.8 N
- 3. In order to determine the effects of a force, acting on a body, we must know
Options- A. magnitude of the force
- B. line of action of the force
- C. nature of the force i,e. whether the force is push or pull
- D. all of the above Discuss
Correct Answer: all of the above
- 4. If a number of forces are acting at a point, their resultant is given by
Options- A. (?V)2 + (?H)2
- B.
- C. (?V)2 +(?H)2 +2(?V)(?H)
- D.
Discuss
Correct Answer:
- 5. A lifting machine lifts a load of 1000N through a distance of 0.2 m by means of an effort of 200N through a distance of 1m. This machine is an ideal one.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
- 6. A ladder is resting on a rough ground and leaning against a smooth vertical wall. The force of friction will act
Options- A. downward at its upper end
- B. upward at its upper end
- C. zero at its upper end
- D. perpendicular to the wall at its upper end Discuss
Correct Answer: zero at its upper end
- 7. The efficiency of a lifting machine is the ratio of
Options- A. output to the input
- B. work done by the machine to the work done on the machine
- C. mechanical advantage to the velocity ratio
- D. all of the above Discuss
Correct Answer: all of the above
- 8. The wheels of a moving car possess
Options- A. potential energy only
- B. kinetic energy of translation only
- C. kinetic energy of rotation only
- D. kinetic energy of translation and rotation both Discuss
Correct Answer: kinetic energy of translation and rotation both
- 9. Non-coplaner non-concurrent forces are those forces which
Options- A. meet at one point, but their lines of action do not lie on the same plane
- B. do not meet at one point and their lines of action do not lie on the same plane
- C. do not meet at one point but their lines of action lie on the same plane
- D. none of the above Discuss
Correct Answer: do not meet at one point and their lines of action do not lie on the same plane
- 10. If the efficiency of a lifting machine is kept constant, its velocity ratio is __________ propotional to its mechanical advantage.
Options- A. directly
- B. inversely Discuss
Correct Answer: directly
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