Silicon Controlled Rectifiers

11. An SCR is sometimes called __________

1. Triac
2. Diac
3. Unijunction transistor
4. Thyristor

View answer

12. An SCR is turned off by __________.

1. Reducing anode voltage to zero
2. Reducing gate voltage to zero
3. Reverse biasing the gate
4. None of the above

View answer

13. An SCR is turned off when __________

1. Anode current is reduced to zero
2. Gate voltage is reduced to zero
3. Gate is reverse biased
4. None of the above

View answer

14. If firing angle in an SCR circuit is increased, the output __________

1. Remains the same
2. Is increased
3. Is decreased
4. None of the above

View answer

15. If gate current is increased, then anode-cathode voltage at which SCR closes __________.

1. Is decreased
2. Is increased
3. Remains the same
4. None of the above

View answer

16. In an SCR circuit the supply voltage is generally __________ that of breakover voltage

1. Equal to
2. Less than
3. Greater than
4. None of the above

View answer

17. In an SCR circuit, the angle of conduction can be changed by __________

1. Changing anode voltage
2. Changing gate voltage
3. Reverse biasing the gate
4. None of the above

View answer

18. In normal operation of an SCR, gate is __________ w.r.t. cathode

1. Positive
2. Negative
3. At zero potential
4. None of the above

View answer

19. In the normal operation of an SCR, anode is __________ w.r.t. cathode

1. At zero potential
2. Negative
3. Positive
4. None of the above

View answer

20. The control element of an SCR is __________

1. Cathode
2. Anode
3. Anode supply
4. Gate

View answer