Power Electronics Questions

• In the basic series inverter circuit, the source current has
• Assertion (A): Chopper always requires forced commutation Reason (R): Morgan chopper uses a saturable reactor.
• Which of these devices have four layers?
• A single phase half wave converter is feeding-a resistor load. The input voltage is v = Vm sin ωt. If firing angle is zero, the output dc voltage Vdc and output rms voltage Vrms respectively
• A capacitor C farads is charged to a voltage V. It discharges through a thyristor, a diode and an inductance L. The peak current in the circuit is
• A single phase converter is fed by a source having an inductance L. If load current is I0, the decrease in output voltage due to overlap is
• In a power diode the reverse recovery time is the time from the instant the forward current is zero to the instant when reverse recovery current has decayed to
• In a semi converter feeding a resistive load,
• In a single phase full wave ac regulator feeding R-L load, the gate pulses
• In a single phase semiconverter feeding a highly inductive load, the load current is
• In auxiliary commutated chopper, the charging and discharging time of capacitor
• Which of these devices is used in relaxation oscillator?
• The difference between resonant commutation and self commutation is
• A cycloconverter for single phase operation has
• Which of these commutation methods uses two leads?
• In a controlled rectifier a freewheeling diode is necessary if the load is
• The total number of leads in MOS controlled thyristor is
• A thyristor circuit is feeding an R-L load. The turn on time can be reduced by
• The stud in a stud mounted SCR acts as
• Assertion (A): An ac regulator uses natural commutation Reason (R): An ac regulator can be used for static on load tap changing of transformer.