Quiz  /  Rectifiers and Converters Gate & PSU MCQ Questions With Answers

  • 1. 
    The ripple factor of a bridge rectifier is

  • 0.482
  • 0.8l2
  • l.ll
  • 1.21

  • 2. 
    A triac can pass a portion of …………… half-cycle through the load

  • Only positive
  • Only negative
  • Both positive and negative
  • None of the above

  • 3. 
    If input frequency is 50Hz for a full wave rectifier, the ripple frequency of it would be _________

  • 100Hz
  • 50Hz
  • 25Hz
  • 500Hz

  • 4. 
    A semi-converter circuit gives the following voltage waveform. Find the expression for the average output voltage with Vs = Vm sinωt and firing angle α

  • (Vm/π) cosα
  • (Vm/π) (1+cosα)
  • (2Vm/π) cosα
  • (2Vm/π) (1+cosα)

  • 5. 
    A simple diode rectifier has ‘ripples’ in the output wave which makes it unsuitable as a DC source. To overcome this one can use

  • A capacitor in series with a the load resistance
  • A capacitor in parallel to the load resistance
  • Both of the mentioned situations will work
  • None of the mentioned situations will work

  • 6. 
    Apakah fungsi satu diod beroda bebas?

  • Diod ini membekalkan voltan keluaran DC yang tetap
  • Diod ini menghalang penyongsangan voltan pada beban semasa separuh kitar negatif bekalan masukan
  • Diod ini membenarkan pelarasan voltan keluaran denganpengawalan sudut picuan
  • Diod ini mendapatkan voltan keluaran yang sama nilainya

  • 7. 
    With respect to the below given circuit, from ωt = 0 to α, ____ thyristor(s) block the forward voltage

  • T1 and T2
  • T2
  • T3 and T4
  • T4

  • 8. 
    In a LC filter, the ripple factor,

  • Increases with the load current
  • increases with the load resistance
  • remains constant with the load current
  • has the lowest value

  • 9. 
    Litar penukar AC – DC yang menggunakan kombinasi Diode dan Thyristor dikenali sebagai :-

  • Litar penerus terkawal sepenuhnya
  • Litar penerus berinduktif
  • Litar penerus separuh terkawal
  • Litar penerus tak terkawal

  • 10. 
    For the given circuit, when the devices T1 and T2 are conducting from ωt = α till they are naturally commutated at π voltage across the other two pair of devices is

  • zero
  • positive( forward voltage)
  • negative (reverse voltage)
  • None of the above

  • 11. 
    Di antara kebaikan peranti semikonduktor dalam litar penerus ialah:-

  • Mempunyai bahagian bergerak
  • Lebih getaran
  • Kos rendah
  • Mudah dibaiki

  • 12. 
    What electrical component is used to smooth half wave current signals?

  • Resistor
  • Diode
  • Capacitor
  • Voltage regulator

  • 13. 
    In a rectifier, larger the value of shunt capacitor filter,

  • larger the peak-to-peak value of ripple voltage
  • larger the peak current in the rectifying diode
  • longer the time that current pulse flows through the diode
  • smaller the dc voltage across the load

  • 14. 
    In the below shown circuit, considering the load to be purely R load, the thyristor T2 would conduct from ωt =

  • 0 to π
  • α to π
  • π+α to 2π
  • π to 2π+α

  • 15. 
    Q1. A Triac has three terminals viz ……………… None of the above

  • Drain, source, gate
  • Two main terminal and a gate terminal
  • Cathode, anode, gate
  • Cathode, anode, emitter

  • 16. 
    Apakah kelebihan litar penerus terkawal sepenuhnya?

  • Hasilkan keluaran yg bolehubah
  • Hasilkan gelombang yang baik
  • Hasilkan voltan keluaran yang sama nilainya
  • Hasilkan kawalan stabil

  • 17. 
    A single-phase full converter bridge type connection has a RLE type of motor load connected. The minimum requirement to turn-on the device is

  • α > 30°
  • Vm sinα > E
  • Vm sinα < E
  • α < 30°

  • 18. 
    For the above shown circuit with continuous load current.Each thyristor pair conducts for

  • π radians
  • 2π radians
  • < π radians
  • > π radians
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