1) Triac is operated in which of the following modes
a) two modes
b) three modes
c) one mode
d) four modes
a) two modes
b) three modes
c) one mode
d) four modes
2) Which is the AC switch
a) thyristor
b) diode
c) triac
d) power diode
3) Which of the following metal to semiconductor diode
a) GTO
b) thyristor
c) schottky diode
d) IGBT
4) Which of the following is correct
a) latching current = holding current
b) latching current > holding current
c) latching current < holding current
d) none of above
5) Why SCR is called as semi controlled switch because
a) gate control only ON state
b) fabricated by silicon
c) small in size
d) none of above
6) What happened if a positive gate signal is given to the reverse biased thyristor
a) it will work normal
b) it will damaged
c) it will work but large power loss
d) none
7) What happened if the delay time is decreased in thyristor turn ON process
a) turn OFF time increased
b) turn ON time decreased
c) turn ON time increased
d) none
8) What happened if the forward voltage is increased above the break down voltage across the thyristor with out applying gate
a) damaged
b) turn ON
c) may damaged or turn ON
d) none
9) What happened gate pulse is removed before the thyristor reaching latching current
a) turn ON
b) turn OFF
c) may turn ON or OFF
d) nothing happen
10) Which condition is satisfied for commutation failure in thyristor circuit
a) device turn off time > circuit turn off time
b) device turn off time = circuit turn off time
c) device turn off time < circuit turn off time
d) none
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