Question:
A single phase induction motor is
A single phase induction motor is
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Single phase induction motors need auxiliary starting methods because they are not inherently self-starting.
Updated On: May 27, 2026
- Inherently self-starting
- Not inherently self-starting
- Self-starting only at high voltages
- Always started by a DC motor
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The Correct Option is B
Solution and Explanation
Concept:
A single phase induction motor does not produce a rotating magnetic field at starting.
Step 1: Single phase supply produces a pulsating magnetic field.
Step 2: A pulsating magnetic field can be considered as two rotating fields in opposite directions.
Step 3: At starting, the torques produced by these fields cancel each other.
Step 4: Therefore, starting torque is zero. Hence, a single phase induction motor is: \[ \boxed{\text{Not inherently self-starting}} \]
Step 1: Single phase supply produces a pulsating magnetic field.
Step 2: A pulsating magnetic field can be considered as two rotating fields in opposite directions.
Step 3: At starting, the torques produced by these fields cancel each other.
Step 4: Therefore, starting torque is zero. Hence, a single phase induction motor is: \[ \boxed{\text{Not inherently self-starting}} \]
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