Discussion
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- Question
The difference between resonant commutation and self commutation is
Options- A. both these methods are based on entirely different principles
- B. in resonant commutation, the commutating elements carry load current but in self commutation, the commutating elements do not carry load current
- C. resonant commutation uses L and C but self commutation uses only capacitor
- D. none of the above
- Correct Answer
- both these methods are based on entirely different principles
- 1. Which of these devices is used in relaxation oscillator?
Options- A. UJT
- B. SCR
- C. DIAC
- D. TRIAC Discuss
- 2. In auxiliary commutated chopper, the charging and discharging time of capacitor
Options- A. are constant
- B. depend on load current
- C. may be constant or may depend on load current
- D. none of the above Discuss
- 3. In a single phase semiconverter feeding a highly inductive load, the load current is
Options- A. sinusoidal
- B. nearly constant
- C. absolutely constant
- D. rectangular Discuss
- 4. In a single phase full wave ac regulator feeding R-L load, the gate pulses
Options- A. are always of short duration
- B. may be of short duration
- C. should be rectangular with width (p - a)
- D. cannot be rectangular with width (p - a) Discuss
- 5. In a semi converter feeding a resistive load,
Options- A. the waveshapes of input voltage and input current are always similar
- B. the waveshapes of input voltage and input current can never be similar
- C. the waveshapes of input voltage and input current are similar only if firing angle is zero
- D. the waveshapes of input voltage and input current are similar only if firing angle is high Discuss
- 6. A cycloconverter for single phase operation has
Options- A. one positive group and one negative group converters
- B. two positive group and two negative group converters
- C. three positive group and three negative group converters
- D. any of the above Discuss
- 7. Which of these commutation methods uses two leads?
Options- A. Class A
- B. Class B
- C. Class C
- D. Class D Discuss
- 8. In a controlled rectifier a freewheeling diode is necessary if the load is
Options- A. inductive
- B. resistive
- C. capacitive
- D. any of the above Discuss
- 9. The total number of leads in MOS controlled thyristor is
Options- A. 2
- B. 3
- C. 4
- D. 2 or 3 Discuss
- 10. A thyristor circuit is feeding an R-L load. The turn on time can be reduced by
Options- A. decreasing R
- B. decreasing L
- C. increasing L
- D. decreasing R and L together Discuss
Power Electronics problems
Search Results
Correct Answer: UJT
Correct Answer: depend on load current
Correct Answer: nearly constant
Correct Answer: should be rectangular with width (p - a)
Correct Answer: the waveshapes of input voltage and input current are similar only if firing angle is zero
Correct Answer: one positive group and one negative group converters
Correct Answer: Class D
Correct Answer: inductive
Correct Answer: 3
Correct Answer: decreasing L
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