Question

A universal motor is designed to operate on

• A. DC supply only
• B. AC supply only
• C. Both AC and DC supply
• D. 3-phase supply only

Hint:

Universal motors can run on both AC and DC supply and are commonly used in portable appliances.

Answer 1

The Correct Option is C

Concept: A universal motor is a special type of motor that can operate on either AC or DC supply.

Step 1: A universal motor is similar to a series motor.

Step 2: In a series motor, armature and field currents reverse together when AC is applied.

Step 3: Since both currents reverse simultaneously, torque direction remains the same.

Step 4: Hence, a universal motor can operate on both AC and DC supply. Therefore: \[ \boxed{\text{Both AC and DC supply}} \]