Power Electronics Questions

• A class D chopper
• In sinusoidal PWM for inverters the width of different pulses are not the same.
• When an SCR is in forward blocking mode, the applied voltage
• In figure, thyristor Th is in off state. When thyristor is turned on, the peak thyristor current can be
• A 3 phase bridge inverter is fed by 400 V battery. The load is star connected and has a resistance of 10 Ω per phase. The peak value of thyristor current is
• The specified maximum junction temperature of thyristors is about
• In a 3 phase full wave regulator feeding a star connected resistance load, firing angle is 75°. Then the number of thyristors conducting at one time is
• The output frequency of a cycloconverter can be changed by changing the firing angle.
• The minimum gate current which can turn on SCR is called :
• In a parallel inverter
• When a power diode is conducting, the voltage drop across it is about
• In a single phase full wave converter (M-2 connection) feeding on R-L load the input voltage is v = Vm sin ωt. The expression for rms output voltage is
• In thermal ohm's law, temperature and power loss are analogous to
• The symbol in figure is for
• In a 3 phase full converter, the instantaneous output voltage can have negative part if
• Which inverter circuit uses coupled inductors?
• In a series inverter
• If the frequency is less than the damped frequency in a series- inverter
• The circuit in figure is for
• A 3 phase dual converter consists of