Power Electronics Questions

• In the circuit of figure, the load current when thyristor is off
• Thyristors connected in series need :
• A single phase bridge type cycloconverter uses eight thyristors.
• A single phase full converter can operate in
• In a thyristor, the forward breakover voltage
• A single phase half wave converter is feeding a resistive load. Output dc power is Pdc and total power delivered to load is Pac then
• A relaxation oscillator uses
• In a 3 phase semiconverter, the freewheeling diode comes into operation only if firing angle
• A current source inverter has simple commutation circuit.
• In a full bridge inverter, the waveshape of load current depends on
• In the basic series inverter circuit, the source supplies load
• A 3 phase fully controlled bridge converter is fed by a 3 phase system having phase voltage v = Vm sin ωt. The firing angle is a. The dc output voltage is
• In an ordinary thyristor
• A voltage VBB is applied across the terminals of a UJT. The emitter voltage at peak point is
• A single phase half wave rectifier circuit has a free wheeling diode. The free wheeling diode will conduct only if
• In a 3 phase bridge inverter with 180° mode of operation the numbers of thyristors conducting at one time are
• In a thyristors are i = kva. The value of a is
• A single phase cycloconverter feeds a resistance heating load. The heating power is provided by
• A full bridge inverter is fed by a battery of 30 V. The rms value of output voltage is
• Which of the following devices exhibit negative resistance characteristics?