Quiz  /  Rectifiers and Converters Bank PO MCQ Questions With Answers

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

  • 20 V
  • 10 V
  • 25 V
  • 50 V

  • 2. 
    Identify the Converter type?

  • 1Φ Dual Converter
  • 3Φ Single Converter
  • 3Φ Dual Converter
  • 1Φ Single Converter

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

  • reduce the switching losses
  • send current back to the dc source when SCRs are off
  • send current back to the load when SCRs are off
  • 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?

  • Forward Voltage Triggering Method
  • Temperature Triggering Method
  • Gate Triggering Method
  • 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

  • is forward biased
  • .is reverse biased
  • may be forward biased or reverse biased
  • forward biased initially but reverse biased afterwards

  • 6. 
    In current source inverters (CSIs)

  • the amplitude of the output current is independent of the load
  • the amplitude of the output current dependents on the load
  • the amplitude of the output voltage is independent of the load
  • none of the mentioned

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

  • True
  • False

  • 8. 
    A chopper

  • converts constant voltage dc into ac
  • converts constant voltage dc into variable voltage dc
  • converts ac of one frequency into ac of another frequency
  • converts ac to dc

  • 9. 
    Inverter converts

  • DC to AC
  • AC to DC
  • DC to DC
  • AC to AC

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

  • 1
  • 2
  • 3
  • 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

  • one, one
  • two, one
  • one, two
  • two, two

  • 12. 
    In a series inverter.

  • the commutating elements L and C are in parallel
  • the commutating elements L and C are in series with load
  • 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

  • To restore conduction angle on phase
  • To avoid negative reversal voltage drop
  • To reduce the PRV

  • 14. 
    A step up chopper can give an output voltage

  • higher than input voltage
  • lower than input voltage
  • both higher and lower input voltage

  • 15. 
    A fully controlled converter uses

  • diodes only
  • thyristors only
  • both diodes and thyristors
  • Noe of them

  • 16. 
    A single-phase Asymmetrical semi-converter employs

  • one SCR and one diode in each leg
  • two SCRs and two diodes in each leg
  • two SCRs in each leg
  • two diodes in each leg

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

  • type of load and firing angle
  • only on the type of load
  • only on the firing angle
  • it is independent of all the parameters

  • 18. 
    A cycloconverter is

  • ac-dc converter
  • dc-ac converter
  • dc-dc converter
  • ac-ac converter
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