Question

A motor was overheating because of low voltage at its terminals. A transformer was installed to correct the problem. What is the secondary voltage of the transformer required to supply 240 volts to the motor? (Round the FINAL answer to one decimal place.)

Answer 1

Answer:

263.3V

Explanation:

The computation of the  secondary voltage of the transformer is shown below:

Given that

Power of motor = 5Hp = 3728.5watts

Voltage across motor = 240V

Now the Current through the motor  is

I = P ÷ V

= 3728.5 ÷ 240

= 15.53A

Also, the value drop os

Vd = I(0.75+0.75)

= 15.53 × 1.5

= 23.3volts

Now

The secondary voltage of the transformer is

Es = 240 + 23.34

= 263.3V