A static induction thyristor is a majority carrier device is a minority carrier

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Question
A static induction thyristor
Options
A. is a majority carrier device
B. is a minority carrier device
C. either a majority carrier or minority carrier device
D. has a total number of 2 leads

Correct Answer

is a minority carrier device

Explanation

It can be turned on by positive gate pulse and turned off by negative gate pulse. It is minority carrier device. It can be manufactured in high current and high voltage ratings and its on state voltage drops is low.

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2. The rated current of a thyristor is 40 A. The holding current will be about :
Options
A. 20 A
B. 1 A
C. 100 mA
D. 10 mA

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4. A single phase semiconverter is feeding a highly inductive load. The circuit has a freewheeling diode across the load and firing angle is a. During one cycle of input voltage, the total duration of conduction of freewheeling diode is
Options
A. a
B. 2 a
C. 4 a
D. 0.5 a

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5. A single phase half wave controlled rectifier circuit has an R-L load. A freewheeling diode is also in the circuit. When freewheeling diode is conducting the SCR
Options
A. is forward biased
B. is reverse biased
C. may be forward biased or reverse biased
D. forward biased initially but reverse biased afterwards

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7. A thyristor is reverse biased. A positive gate pulse is applied. The thyristor
Options
A. will be turned on
B. may or may not turn on
C. will not turn on
D. will turn on after sometime

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