A. Only at turn – on
B. Only at turn – off
C. Both at turn on and off
D. None of these
A. Can control the load voltage
B. Cannot control the load voltage
C. Cannot control the load voltage except by means of dc link voltage
D. Cannot control the load voltage except by means of dc link current
A. TRIAC
B. SCR
C. GTO
D. Only (a) and (b)
A. Sine wave
B. Square wave
C. Saw – tooth wave
D. Trapezoidal wave
A. A switching pulse generator and a shorting pulse generator
B. A shorting pulse distributor
C. A switching and shorting pulse combination
D. All of these
A. Frequencies above 20 kHz
B. Frequencies above 1000 kHz
C. Frequencies less than 10 Hz
D. 50 Hz frequency
A. Zero
B. Non zero
C. Equal to the sum of voltage when switch is open
D. Twice of the voltage when switch is open