This is the electrical engineering questions and answers section on "Single Phase 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. The capacitance of a small single phase motor will be of the order of
- A. Kilo farads
- B. Few hundred farads
- C. Farads
- D. Micro or pico farads
Answer: Option D
Explanation:
Micro or pico farads
2. In case of split phase motors the phase shift is usually limited to
- A. 3 degrees
- B. 60 degrees
- C. 90 degrees
- D. 150 degrees
Answer: Option A
Explanation:
3 degrees
3. For ceiling fans generally the single phase motor used is
- A. split phase type
- B. capacitor start type
- C. capacitor start and run type
- D. permanent capacitor type
Answer: Option D
Explanation:
permanent capacitor type
4. In portable tools the speed of the driven shaft is reduced by
- A. Gearing
- B. Belt drive
- C. Chain drive
- D. Fluid coupling
Answer: Option A
Explanation:
Gearing
5. Which of the following applications make use of a universal motor ?
- A. Floor polishing machine
- B. Oil expeller
- C. Portable tools
- D. Lathe machines
Answer: Option C
Explanation:
Portable tools
