1. An SCR is turned off when its turn-off time is
2. Which one of the following statements is NOT true?
3. The average on state current for an SCR is 20 A for a conduction angle of 120°. The average on-state current for 60° conduction angle will be
4. Match List-I with List-II and select the correct answer.
List-I (Device)
List-II (Property/item associated with it)
a. BJT
1. Pinch-off effect
b. FET
2. Controlled rectification
c. SCR
3. Negative resistance characteristics
d. Tunnel diode
4. Punch-through effect
| List-I (Device) | List-II (Property/item associated with it) |
| a. BJT | 1. Pinch-off effect |
| b. FET | 2. Controlled rectification |
| c. SCR | 3. Negative resistance characteristics |
| d. Tunnel diode | 4. Punch-through effect |
5. Which semiconductor power device out of the following is not a current triggered device?
6. The purpose of connecting a Zener diode in a UJT circuit, used for triggering thyristors, is to
7. When the pnpn diode is biased such that the p side is more positive than the n side, the junction J1 and J3 are:
8. A six pulse thyristor rectifier bridge is connected to a balanced 50 Hz, three phase AC source. Assuming that the DC output current of rectifier is constant, the lowest frequency harmonic component in the AC source line current is
9. The triac can be used only in
10. The turn-off time of thyristor is 30 µ sec at 50°C its turn-off time at 100°C will be
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