If the firing angle becomes negative, then the rectifier begins to work as_______________?

Related Mcqs:

1. In a 3 phase half wave rectifier, when firing angle is less than 90 degree, then the average dc output voltage becomes__________________?

   A. Positive
   B. Negative
   C. Zero
   D. None of these

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. With increase in firing angle,

   A. Both harmonic distortion and quality of input current increases
   B. Harmonic distortion increases and quality of input current decreases
   C. Harmonic distortion decreases and quality of input current increases
   D. Both harmonic distortion and quality of input current decreases

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

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

5. 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

6. In a single phase full wave rectifier, during blocking state the pea inverse voltage of diode is______________?

   A. V m
   B. 2 V m
   C. V m / 2
   D. 4 V m

7. In a full wave rectifier, the rectification ratio is approximately equal to____________?

   A. 61%
   B. 71%
   C. 81%
   D. 91%

8. In a 3 phase bridge rectifier the ripple frequency is _____________?

   A. Equal to the input frequency
   B. Twice the input frequency
   C. Three times the input frequency
   D. Six times the input frequency

9. 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

10. Silicon controlled rectifier can be turned on____________?

    A. By applying a gate pulse and turned off only when current becomes zero
    B. And turned off by applying gate pulse
    C. By applying a gate pulse and turned off by removing the gate pulse
    D. By making current non zero and turned off by making current zero