Rectifiers and Converters Bank PO MCQ Questions With Answers Quiz Questions

1. What will be the output voltage of a buck converter with an input voltage of 25V, 40% duty cycle?

A 20 V B 10 V C 25 V D 50 V

2. Identify the Converter type?

A 1Φ Dual Converter B 3Φ Single Converter C 3Φ Dual Converter D 1Φ Single Converter

3. In the full bridge inverter, the diodes D1 to D4 are used to

A reduce the switching losses B send current back to the dc source when SCRs are off C send current back to the load when SCRs are off D send current back to the dc source when SCRs are conducting

4. What is the most suitable method to turn on the SCR device among the following?

A Forward Voltage Triggering Method B Temperature Triggering Method C Gate Triggering Method D dv/dt triggering Method

5. A single phase half wave controlled rectifier circuit has an R-L load. A freewheeling diode is also in the circuit. When freewheeling diode is conducting the SCR

A is forward biased B .is reverse biased C may be forward biased or reverse biased D forward biased initially but reverse biased afterwards

6. In current source inverters (CSIs)

A the amplitude of the output current is independent of the load B the amplitude of the output current dependents on the load C the amplitude of the output voltage is independent of the load D none of the mentioned

7. In a dual converter both converters work as rectifiers.

A True B False

8. A chopper

A converts constant voltage dc into ac B converts constant voltage dc into variable voltage dc C converts ac of one frequency into ac of another frequency D converts ac to dc

9. Inverter converts

A DC to AC B AC to DC C DC to DC D AC to AC

10. The number of diodes used to build a bridge rectifier

A 1 B 2 C 3 D 4

11. A single phase full-converter using R load is a _________ quadrant converter and that using an RL load without FD is a __________ quadrant converter

A one, one B two, one C one, two D two, two

12. In a series inverter.

A the commutating elements L and C are in parallel B the commutating elements L and C are in series with load C the commutating L and C may be in series or parallel with the load

13. A freewheeling diode is connected across an inductive load is

A To restore conduction angle on phase B To avoid negative reversal voltage drop C To reduce the PRV

14. A step up chopper can give an output voltage

A higher than input voltage B lower than input voltage C both higher and lower input voltage

15. A fully controlled converter uses

A diodes only B thyristors only C both diodes and thyristors D Noe of them

16. A single-phase Asymmetrical semi-converter employs

A one SCR and one diode in each leg B two SCRs and two diodes in each leg C two SCRs in each leg D two diodes in each leg

17. In case of controlled rectifiers, the nature of the load current (continues or discontinuous) depends upon the

A type of load and firing angle B only on the type of load C only on the firing angle D it is independent of all the parameters

18. A cycloconverter is

A ac-dc converter B dc-ac converter C dc-dc converter D ac-ac converter