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

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

   A. A rectifier
   B. An inverter
   C. A chopper
   D. A regulator

5. The advantage of using free – wheeling diode in half controlled bridge converter is that

   A. There is always a path for the dc current independent of the ac line
   B. There is always a path for the ac current independent of the ac line
   C. There is always a path for the dc current dependent of the ac line
   D. There is always a path for the ac current independent of the ac line

6. The most suited gate pulses given to the AC regulator with R – L load can be in the form of____________?

   A. Continuous signal
   B. Large isolating pulse transformer
   C. A train of pulses
   D. None of these

7. Regulator sampling PWM is usually used in___________?

   A. High power inverters
   B. Rectifiers
   C. Low power inverters
   D. Only A. and B.

8. The square wave operation of 3 phase VSI lines contains the harmonics. The amplitudes are____________?

   A. Directly proportional to their harmonic order
   B. Inversely proportional to their harmonic order
   C. Not related to their harmonic order
   D. None of these

9. A full wave rectifier with resistive load produces___________?

   A. Second harmonic
   B. Third harmonic
   C. Fifth harmonic
   D. Do not produce harmonics

10. In square wave operation mode of 3 phase VSI, the VSI

    A. Can control the load voltage
    B. Cannot control the load voltage
    C. Cannot control the load voltage except by means of dc link voltage
    D. Cannot control the load voltage except by means of dc link current