Physics
Unit of velocity ratio is:
- Nm
- Joule
- Newton
- No unit
Machines
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Answer
No unit
Reason — As velocity ratio is a ratio between similar quantities (distances) so it has no unit.
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Related Questions
For an ideal machine:
- Output energy = Input energy
- Output energy > Input energy
- Output energy < Input energy
- Work output > Work input
Which of the following statements is incorrect?
- For a machine, velocity ratio does not change.
- Due to friction, mechanical advantage of a machine increases.
- For an ideal machine, work output is equal to the work input.
- 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:
- M.A. = η x V.R.
- V.R. = η x M.A.
- η = M.A. x V.R.
- None of these
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