Assertion (A): Typical value of thermal resistance from source to sink of an SCR

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Question
Assertion (A): Typical value of thermal resistance from source to sink of an SCR is about 0.3� C/W
Reason (R): Heat sinks of thyristors are generally made of aluminium.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

Correct Answer

Both A and R correct but R is not correct explanation of A

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4. The gate lead, in a thyristor is welded to :
Options
A. p layer to which anode is connected
B. n layer nearest to the anode terminal
C. p layer nearest to the cathode terminal
D. outside n layer

6. In integral cycle control of ac regulators, the period of integral cycle control, i.e., (m + n) T should be
Options
A. less than mechanical or thermal time constant of the system
B. more than the mechanical or thermal time constant of the system
C. more or less than the mechanical or thermal time constant
D. very high

8. Assertion (A): A transistor has lower voltage drop during conduction as compared to thyristor
Reason (R): Transistors are manufactured in very high voltage and current ratings.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

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