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41. Under over voltage condition impedance offered by the voltage clamping device is__________?

A. low
B. High
C. moderate
D. infinity

42. Which semiconductor device acts like a diode and two transistor?

A. UJT
B. Diac
C. Triac
D. SCR

43. Under normal operating condition voltage clamping device offers impedance of_________?

A. high value.
B. low value.
C. zero value.
D. moderate value.

44. What is used to protect the SCR from over current ________________?

A. CB and fuse.
B. Heat sink.
C. Snubber circuit.
D. Voltage clamping device.

45. Thyristor can be protected from over voltages by using____________?

A. voltage clamping device.
B. fuse.
C. heat sink.
D. snubber circuit.

46. Practical way of obtaining static voltage equalization in series connected SCRs is by the use of____________?

A. One resistor across the string
B. Resistors of the same value across each SCR
C. Resistors of different values across each SCR
D. One resistor in series with each SCR

47. Switching frequency of SITH is____________?

A. 5 KHz
B. 10 KHz
C. 60 KHz
D. 100 KHz

48. Example of a voltage clamping device______________?

A. fast acting fuse
B. snubber circuit
C. metal oxide varistor
D. aluminium block

49. The maximum di/dt in a SCR is____________?

A. Directly proportional to supply voltage
B. Directly proportional to inductance in the circuit
C. Inversely proportional to supply voltage
D. Both A and B

50. The latching current of GTO should be of the order

A. 100 mA
B. 500 mA
C. 1 A
D. 2 A