Question

A motor rsceives 4 KW power and delivers

4 HP (Metric) then the efficiency of motor .​

Answer 1

Answer:

74.6% or 0.746

Explanation:

efficiency = power in HP X 746 / power in Watt

= 4 x 746/4000 = 0.746 i.e 74.6%

Answer 2

Answer:

Efficiency, $\eta=74.5\%$

Explanation:

It is given that,

Input power, P' = 4 kW

Output power, P = 4 hp = 2.98 kW

We need to find the efficiency of the motor. The ratio of output power to the input power is called the efficiency of any machine i.e.

$\eta=\dfrac{P}{P'}\times 100$

$\eta=\dfrac{2.98\ kW}{4\ kW}\times 100$

$\eta=74.5\%$

So, the efficiency of the motor is 74.5 %. Hence, this is the required solution.