A. Positive
B. Negative
C. Zero
D. None of these
A. AC input power to the transformer volt – amp rating required by secondary
B. AC input power to the transformer volt – amp rating required by primary
C. DC output power to the transformer volt – amp rating required by secondary
D. DC output power to the transformer volt – amp rating required by primary
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 carrier based PWM technique in CSI is composed of____________? Read More »
Power Electronics A. 60 degree
B. 90 degree
C. 120 degree
D. 150 degree
In a square – wave operation of 3 phase CSIs, the power values are on for___________? Read More »
Power Electronics A. Rms value of the ac component of load voltage to the dc voltage
B. Average value of the ac component of load voltage to the peak value of voltage
C. Average value of the dc component of load voltage to the ac voltage
D. Peak value of the dc component of load voltage to the ac voltage
Ripple factor is the ratio of______________________? Read More »
Power Electronics A. Root mean square value of voltage and current to its peak value
B. Root mean square value of voltage and current to its average value
C. Average value of current and voltage to its root mean square value
D. Peak value of current and voltage to its root mean square value
Form factor of a rectifier is the ratio of ______________? Read More »
Power Electronics A. By applying a gate pulse and turned off only when current becomes zero
B. And turned off by applying gate pulse
C. By applying a gate pulse and turned off by removing the gate pulse
D. By making current non zero and turned off by making current zero
Silicon controlled rectifier can be turned on____________? Read More »
Power Electronics A. Two SCR’s connected in reverse parallel
B. Two SCR’s connected in parallel
C. Two SCR’s connected in series
D. Two BJT’s connected in series
TRIAC is a semiconductor power electronic device which contains____________? Read More »
Power Electronics A. both as forward characteristics
B. both as reverse characteristics
C. former as forward characteristics and later as reverse characteristics
D. former as reverse characteristics and later as forward characteristics
A. as static conductor
B. for power control
C. for speed control of dc shunt motor
D. All of these
An SCR can be used___________? Read More »
Power Electronics