Power Electronics Questions

• In a single phase full wave regulator, the rms current in each thyristors is Ir The run load current is equal to
• A class A chopper has an input voltage of 200 V. Ton = 1.5 ms and Toff = 4.5 ms. The duty cycle, average output voltage and ripple factor respectively are
• The symbol in figure is for
• The commutation method in an inverter, is
• The output wave of a cycloconverter consists of a number of segments derived from the input wave.
• An SCR is triggered at 80° in the positive half cycle, only. The rms anode current is 25 A. If the firing angle is changed to 160°, the rms current is likely to be
• Which chopper circuit operates in quadrants 1 and 4?
• Assertion (A): A fully controlled bridge converter can operate in first and fourth quadrant. Reason (R): A semi converter is cheaper than a full converter.
• In auxiliary commutated chopper, the peak value of thyristor current is
• In a single phase full converter fed by a source having inductance, the number of thyristors conducting during overlap is
• A load commutated chopper circuit has
• In a single phase full wave controlled rectifier using centre tap transformer, the voltage across each half of secondary is Vm sin ωt. The peak inverse voltage is
• If peak value of input voltage is Vm and firing angle is a, the average output voltage for single phase half wave and single phase full wave regulators are
• Lead mounting for SCR is used for
• A TRIAC can be turned on :
• In a three phase series inverter, the firing frequency is
• A 3 phase fully controlled converter is a
• When a thyristor is conducting, the voltage drop across it is about
• The use of free wheeling diode in controlled rectifier improves the waveshape of load current.
• In a half bridge inverter, the freewheeling diodes are needed