Test: Power Electronics & Drives- 1 - Electrical Engineering (EE) MCQ

A single phase ac voltage controller  feeding a pure resistance  load has a load voltage of 200 V(rms) when fed from a source  of 250 V(rms). The input power factor of the controller is  

In a thyristor-controlled rectifier, the firing  angle of thyristor  is to be controlled in the range of  

A 3-phase wound rotor induction motor is controlled by a  chopper-controlled resistance in its rotor circuit. A resistance  of 2Ω is connected in the rotor circuit and a resistance of 4Ω is additionally  connected during OFF periods of the chopper.  The OFF period of the chopper is 4 ms. The average  resistance in the rotor  circuit for the chopper frequency of   200 Hz is  

The most suitable device for high frequency inversion in  SMPS is  

In a self-controlled synchronous motor fed from a variable frequency inverter

in case of voltage source inverter, freewheeling diode can be avoided for the load of

A single-phase full-bridge converter with a free-wheeling  diode feeds an inductive load. The load resistance is 15.53Ω and it has a large inductance providing constant and ripple  free d.c. current. Input to converter is from an ideal 230V,  50Hz single phase source. For a firing delay  angle of 60°, the  average value of diode current is