An unexcited single phase synchronous motor is
A. AC series motor.
B. universal motor.
C. reluctance motor.
D. repulsion motor.
Show Answer
Answer: B
Share your understanding of this question with the correct explanation.
The answer is B. Universal motor.
A universal motor is a type of electric motor that can operate on either AC or DC power. It is a series motor, which means that the field winding and the armature winding are connected in series. This type of motor is commonly used in small appliances such as vacuum cleaners, food mixers, and power tools.
A reluctance motor is a type of synchronous motor that does not require an external DC field current. It is also called an unexcited synchronous motor. Reluctance motors are used in applications where a constant speed is required, such as clocks and timers.
A repulsion motor is a type of synchronous motor that uses the repulsion principle to create torque. Repulsion motors are not as common as reluctance motors, but they are used in some applications where a high starting torque is required.
An AC series motor is a type of electric motor that is only suitable for AC power. It is not an unexcited motor, as it requires a DC field current to operate. AC series motors are used in applications where a high starting torque is required, such as electric trains and elevators.
Therefore, the only unexcited single phase synchronous motor is a universal motor.