Physics
Which of the following relations is wrong?
- Work input = Effort x Displacement of effort
- Work output = Load x Displacement of load
- Efficiency = Work input / Work output
- Mechanical advantage = Velocity ratio x Efficiency
Machines
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Answer
Efficiency = Work input / Work output
Reason — Efficiency is the ratio of useful work output to the total work input.
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Related Questions
Unit of velocity ratio is:
- Nm
- Joule
- Newton
- No unit
The correct relationship between the mechanical advantage (M.A.), velocity ratio (V.R.) and efficiency (η) is:
- M.A. = η x V.R.
- V.R. = η x M.A.
- η = M.A. x V.R.
- None of these
If the effort needed is less than the load, then mechanical advantage of the machine is:
- Greater than 1
- Less than 1
- Equal to one
- None of these
Select the incorrect statement:
- A machine always has efficiency less than 100%.
- The mechanical advantage of a machine can be less than 1.
- A machine can have mechanical advantage greater than the velocity ratio.
- A machine can be used as a speed multiplier.