The input current waveform of a bridge controlled rectifier when the load is perfectly filtered is___________?
(A) Sine wave
(B) Square wave
(C) Saw – tooth wave
(D) Trapezoidal wave
The IGBT resulted in higher switching speed and lower energy losses. It can be used for___________?
(A) Uninterruptible power supplies
(B) Induction heating system
(C) Constant voltage and frequency power supplies
(D) All of these
In constant frequency PWM, at perturbation the amplitude of the sinusoidal component is a___________?
(A) Linear function
(B) Non linear function
(C) Constant function
(D) None of these
If the firing angle becomes negative, then the rectifier begins to work as_______________?
(A) A rectifier
(B) An inverter
(C) A chopper
(D) A regulator
In variable frequency, PWM gain
(A) Phase lead helps to increase the phase margin of the control loop
(B) Phase lag helps to increase the phase margin of the control loop
(C) Phase lead helps to decrease the phase margin of the control loop
(D) Phase lag helps to decrease the phase margin of the control loop
In a 3 phase half wave rectifier, when firing angle is less than 90 degree, then the average dc output voltage becomes__________________?
(A) Positive
(B) Negative
(C) Zero
(D) None of these
Transformer utilization factor is a measure of the merit of a rectifier circuit. It is the ratio of_______________?
(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 carrier based PWM technique in CSI is composed of____________?
(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
In a square – wave operation of 3 phase CSIs, the power values are on for___________?
(A) 60 degree
(B) 90 degree
(C) 120 degree
(D) 150 degree
Ripple factor is the ratio of______________________?
(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