If the efficiency of a lifting machine is kept constant, its velocity ratio is _

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Question
If the efficiency of a lifting machine is kept constant, its velocity ratio is __________ propotional to its mechanical advantage.
Options
A. directly
B. inversely

Correct Answer

directly

Engineering Mechanics problems

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1. 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

2. 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

3. 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

4. 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

9. The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the opposite directions. These forces are known as
Options
A. coplaner concurrent forces
B. coplaner non-concurrent forces
C. like parallel forces
D. unlike parallel forces

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