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

Answers: What is used to protect the SCR from over current  CB and fuse.

(A) high value. ()
(B) low value. (X)
(C) zero value. (X)
(D) moderate value. (X)

Answers: Under normal operating condition voltage clamping device offers impedance of  high value.

(A) UJT (X)
(B) Diac (X)
(C) Triac ()
(D) SCR (X)

Answers: Triac

(A) low ()
(B) High (X)
(C) moderate (X)
(D) infinity (X)

Answers: Under over voltage condition impedance offered by the voltage clamping device is low.

(A) 100 mA (X)
(B) 500 mA  ()
(C) 1 A (X)
(D) 2 A (X)

Answers: The latching current of GTO should be of order 500 mA.

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

Answers: The maximum di/dt in a SCR is Both A and B.