AC power in a load can be controlled by using____________?

Related Mcqs:

1. Thyristor can be protected from over voltages by using____________?

   A. voltage clamping device.
   B. fuse.
   C. heat sink.
   D. snubber circuit.

2. A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is _____?

   A. 30° to 150°.
   B. 30° to 180°.
   C. 60° to 120°.
   D. 60° to 180°.

3. AC power in a load can be controlled by using_____________?

   A. two SCR’s in parallel opposition
   B. two SCR’s in series
   C. three SCR’s in series
   D. four SCR’s in series

4. In a silicon controlled rectifier, the load is connected___________?

   A. Across anode
   B. In series with anode
   C. Across cathode
   D. In series with cathode

5. The input current waveform of a bridge controlled rectifier when the load is perfectly filtered is___________?

   A. Sine wave
   B. Square wave
   C. Saw – tooth wave
   D. Trapezoidal wave

6. A single phase full bridge inverter can operated in load commutation mode in case load consist of______?

   A. RL.
   B. RLC underdamped.
   C. RLC overdamped.
   D. RLC critically damped

7. A single phase full bridge inverter can operate in load commutation mode in case load consists of____________?

   A. RL.
   B. RLC underdamped.
   C. RLC overdamped.
   D. RLC critically damped.

8. In a lossless inverter, the average power absorbed in one period by the load must be__________?

   A. Equal to the average power supplied by the dc source
   B. Greater than the average power supplied by the dc source
   C. Lesser than the average power supplied by the dc source
   D. Equal to the average power supplied by the ac source

9. Power electronics essentially deals with control of a.c. power at____________?

   A. Frequencies above 20 kHz
   B. Frequencies above 1000 kHz
   C. Frequencies less than 10 Hz
   D. 50 Hz frequency

10. The maximum firing angle in the half wave controlled regulator is_____________?

    A. 180 degree
    B. 190 degree
    C. 200 degree
    D. 210 degree