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- Question
The maximum mechanical advantage of a lifting machine is
Options- A. 1 + m
- B. 1 - m
- C. 1 / m
- D. m
- Correct Answer
- 1 / m
- 1. When the lift is moving upwards with some acceleration, the pressure exerted by a man is __________ proportional to its acceleration.
Options- A. directly
- B. inversely Discuss
- 2. Two forces are acting at an angle of 120°. The bigger force is 40N and the resultant is perpendicular to the smaller one. The smaller force is
Options- A. 20 N
- B. 40 N
- C. 80 N
- D. none of these Discuss
- 3. When a body falls freely under gravitational force, it possesses __________ weight.
Options- A. no
- B. minimum
- C. maximum Discuss
- 4. Which of the following statement is correct in connection with projectiles?
Options- A. A path, traced by a projectile in the space, is known as trajectory.
- B. The velocity with which a projectile is projected, is known as the velocity of projection.
- C. The angle, with the horizontal, at which a projectile is projected is known as angle of projection.
- D. all of the above Discuss
- 5. The angle of inclination of the plane at which the body begins to move down the plane, is called
Options- A. angle of friction
- B. angle of repose
- C. angle of projection
- D. none of these Discuss
- 6. If three forces acting at a point be represented in magnitude and direction by the three sides of a triangle, taken in order, the forces shall be in equilibrium.
Options- A. True
- B. False Discuss
- 7. If a body is thrown upwards, then the gravitational acceleration is taken as zero.
Options- A. Correct
- B. Incorrect Discuss
- 8. The energy possessed by a body, for doing work by virtue of its position, is called
Options- A. potential energy
- B. kinetic energy
- C. electrical energy
- D. chemical energy Discuss
- 9. If P is the force acting on the body, m is the mass of the body and a is the acceleration of the body, then according to Newton's second law of motion,
Options- A. P + m.a = 0
- B. P - m.a = 0
- C. P x m.a = 0
- D. P/m.a = 0 Discuss
- 10. Which of the following statement is incorrect?
Options- A. A force acting in the opposite direction to the motion of the body is called force of friction.
- B. The ratio of the limiting friction to the normal reaction is called coefficient of friction.
- C. A machine whose efficiency is 100% is known as an ideal machine.
- D. The velocity ratio of a machine is the ratio of load lifted to the effort applied. Discuss
Engineering Mechanics problems
Search Results
Correct Answer: directly
Correct Answer: 20 N
Correct Answer: no
Correct Answer: all of the above
Correct Answer: angle of friction
Correct Answer: True
Correct Answer: Incorrect
Correct Answer: potential energy
Correct Answer: P - m.a = 0
Correct Answer: The velocity ratio of a machine is the ratio of load lifted to the effort applied.
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