Dynamic equalising circuit is useful____________?

Related Mcqs:

1. For series connected SCR’s dynamic equalising circuit consists of___________?

   A. R and C in series but with diode across C
   B. R and C in series but with diode across R
   C. Series R and diode with C across R
   D. Series R and diode with C across R

2. Dynamic equalizing circuit is used for________________?

   A. equal division of voltage across each thyristor
   B. equal division of current through each thyristor in parallel
   C. equal division of voltage across each thyristor in parallel
   D. equal division of current through each thyristor in series

3. Gate circuit or triggering circuit of a thyristor is

   A. lower power circuit.
   B. high power circuit.
   C. magnetic circuit.
   D. may be low power or high power circuit

4. 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°.

5. The function of snubber circuit connected across the SCR is to___________?

   A. Suppress dV / dt.
   B. Increase dV / dt.
   C. Decrease dV / dt.
   D. Decrease di / dt.

6. Voltage commutation circuit can be converted into a current commutation by interchanging the positions of____________?

   A. Diode and capacitor
   B. Capacitor and SCR
   C. Inductor and capacitor
   D. Capacitor and load

7. Any electrical signal present in a circuit other than the desired signal is known as______________?

   A. Noise
   B. Distortion
   C. Interference
   D. All of these

8. A crowbar is a circuit which is used to protect a_____________?

   A. voltage sensitive load from excessive dc power supply output voltages
   B. current sensitive load from excessive dc power supply output voltages
   C. voltage sensitive load from excessive ac power supply output voltages
   D. current sensitive load from excessive ac power supply output voltages

9. Transformer utilization factor is a measure of the merit of a rectifier circuit. It is the ratio of_______________?

   A. AC input power to the transformer volt – amp rating required by secondary
   B. AC input power to the transformer volt – amp rating required by primary
   C. DC output power to the transformer volt – amp rating required by secondary
   D. DC output power to the transformer volt – amp rating required by primary

10. In a full bridge VSI, in order to avoid the short circuit across the DC bus and the undefined AC output voltage condition, the modulating technique should ensure that___________?

    A. Top switch of each leg is on at any instant
    B. Bottom switch of each leg is on at any instant
    C. Either A. or B.
    D. None of these