Power Electronics Questions

• A high frequency series inverter consists of
• When thyristors are connected in series and parallel, it may be necessary to have :
• In the below figure, the average value of load current is 15 A. The load is highly inductive. The peak value of thyristor current is
• In a multiphase chopper, the different choppers operate in
• In dielectric heating, the thyristor circuits consist of
• In a 3 phase semiconverter, the firing frequency is
• A single phase fully controlled bridge rectifier is fed by a source having inductance. The output voltage during overlap period is
• A thyristor has its gate current zero. To start conduction the forward voltage must exceed
• In the below figure the rms voltage across each half of secondary is 200 V. The peak inverse voltage across each of thyristor is
• In a dual converter both converters work as rectifiers.
• The waveshape of output voltage of half bridge inverter is
• In an SCR, the anode current consists of
• In a single phase full wave ac regulator, the firing angles in the two half cycles
• In a single phase dual converter, a1, and a2 are firing angles of the two converters. Then
• A dc chopper V = 500 V feeds an electric fraction dc series motor. The chopping frequency is 400 Hz. The series inductance required to limit the maximum current swing to 10 A is
• Between which points does UJT exhibit negative resistance characteristics
• The gate current required to turn on an SCR is
• In a semi converter feeding a resistive load, the firing angle is a. Each thyristor conducts for
• An SCR has a turn on time of 4 μs. The gate pulse should have a duration of about
• A 3 phase semiconverter when supplying a certain load has a rectification efficiency of 0.6 and transformer utilisation factor of 0.35. When a 3 phase full converter is supplying the same load