For an ideal machine:

1. Output energy = Input energy
2. Output energy > Input energy
3. Output energy < Input energy
4. Work output >  Work input

Which of the following statements is incorrect?

1. For a machine, velocity ratio does not change.
2. Due to friction, mechanical advantage of a machine increases.
3. For an ideal machine, work output is equal to the work input.
4. For an ideal machine, mechanical advantage is numerically equal to the velocity ratio

The correct relationship between the mechanical advantage (M.A.), velocity ratio (V.R.) and efficiency (η) is:

1. M.A. = η x V.R.
2. V.R. = η x M.A.
3. η = M.A. x V.R.
4. None of these

Which of the following relations is wrong?

1. Work input = Effort x Displacement of effort
2. Work output = Load x Displacement of load
3. Efficiency = Work input / Work output
4. Mechanical advantage = Velocity ratio x Efficiency