Power Semiconductor Device and Integrated Circuits Questions - 1

Question: 1

An SCR triggered by a current pulse through its gate can be turned off by

(A) by reversing the polarity of anode and cathode voltage

(B) by giving pulse to the anode

(C) by giving pulse to the cathode

(D) giving another pulse of the same polarity to the gate

Question: 2

A gate turn off (GTO) thyristor has capacity to

(A) amplify the gate current

(B) turn-off when a negative current pulse is given at the gate

(C) turn-off when gate pulse is given at the gate even though it is reverse biased

(D) turn-off when positive current pulse is given at the gate

Question: 3

Static voltage equalization in series connected SCRs is obtained by the use of

(A) one resistor in series with the string

(B) one resistor across the string

(C) resistors of different values across each SCR

(D) resistors of the same value across each SCR

Question: 4

Turn-on and turn-off times of transistor depend on

(A) current gain

(B) static characteristics

(C) junction capacitances

(D) none of the above

Question: 5

In the forward blocking region of a silicon controlled rectifier, the SCR is

(A) at the point of breakdown

(B) reverse biased

(C) in the off state

(D) in the on state