When induction motor is at standstill, slip of the machine will be:Question 5Select one:a.0b.1c.Infinited.-1

To determine the slip of an induction motor at standstill, we can analyze the concept of slip in detail.

1. Understanding Slip in Induction Motors

Slip $S$ is defined as the difference between the synchronous speed $N_s$ and the actual rotor speed $N_r$, expressed as a fraction of the synchronous speed. It can be mathematically represented as:

$S = \frac{N_s - N_r}{N_s}$

2. Condition at Standstill

When the induction motor is at standstill, the rotor speed $N_r$ is 0. Therefore, the equation for slip becomes:

$S = \frac{N_s - 0}{N_s} = \frac{N_s}{N_s} = 1$

3. Final Answer

Thus, the slip of the machine when the induction motor is at standstill is:

$\boxed{1}$

The correct option is b. 1.