Question

Select the incorrect statement :

(a) A machine always has the efficiency less than $100\%$.

(b) The mechanical advantage of a machine can be less than 1.

(c) A machine can be used as a speed multiplier.

(d) A machine can have the mechanical advantage greater than the velocity ratio.

Answer 1

Option (d) is incorrect. A machine can't have the mechanical advantage greater than the velocity ratio.

$\eta =\frac{M.A.}{V.R.}$ whose value is less than 1 in practical life.