This is the electrical engineering questions and answers section on "Synchronous Motor" with explanation for various interview, competitive examination and entrance test. Solved examples with detailed answer description, explanation are given and it would be easy to understand.
1. A synchronous motor working on leading power factor and not driving any mechanical, is known
- A. synchronous induction motor
- B. spinning motor
- C. synchronous condenser
- D. none of the above
Answer: Option C
Explanation:
synchronous condenser
2. Which motor can conveniently operate on lagging as well as leading power factor ?
- A. squirrel cage induction motor
- B. wound rotor induction motor
- C. synchronous motor
- D. any of the above
Answer: Option C
Explanation:
synchronous motor
3. The back emf in the stator of a synchronous motor depends on
- A. speed of rotor
- B. rotor excitation
- C. number of poles
- D. flux density
Answer: Option B
Explanation:
rotor excitation
4. Which of the following motors is non-self starling ?
- A. squirrel cage induction motor
- B. wound rotor induction motor
- C. synchronous motor
- D. DC series motor
Answer: Option C
Explanation:
synchronous motor
5. In case of a synchronous motor we have
I. Load
II. Speed
III. DC excitation
The magnitude of stator back emf depends on
- A. I only
- B. I and II only
- C. III only
- D. I, II and III
Answer: Option C
Explanation:
III only
