Menu
Home / ECE / Power Electronics :: Section 7

ECE :: Power Electronics

Power Electronics - Section 1
Power Electronics - Section 2
Power Electronics - Section 3
Power Electronics - Section 4
Power Electronics - Section 5
Power Electronics - Section 6
Power Electronics - Section 7
Power Electronics - Section 8
Power Electronics - Section 9

  1. Which of the following devices has two gates?

    2. A.
    SCR
    B.
    SCS
    C.
    SUS
    D.
    SBS

    View Answer

    Workspace

    Discuss Discuss in Forum

  2. In auxiliary commutated chopper, the peak value of thyristor current is

    3. A.
    equal to peak value of load current
    B.
    equal to peak value of capacitor current
    C.
    sum of peak value of load current and capacitor current
    D.
    none of the above

    View Answer

    Workspace

    Discuss Discuss in Forum

  3. The symbol in figure is for

    4. A.
    SUS
    B.
    SBS
    C.
    SCS
    D.
    Shockley diode

    View Answer

    Workspace

    Discuss Discuss in Forum

  4. If peak value of input voltage is Vm and firing angle is a, the average output voltage for single phase half wave and single phase full wave regulators are

    5. View Answer

    Workspace

    Discuss Discuss in Forum

  5. The static equalisation circuit for thyristors connected in series is

    6. A.
    one resistor in series with each thyristor
    B.
    one resistor in parallel with each thyristor
    C.
    one resistor and one capacitor in parallel with each thyristor
    D.
    none of the above

    View Answer

    Workspace

    Discuss Discuss in Forum

  6. A cycloconverter is a group of controlled rectifiers.

    7. A.
    True
    B.
    False

    View Answer

    Workspace

    Discuss Discuss in Forum

  7. A single phase full wave regulator feeds a resistive load. The firing angle of thyristors is 90°. The input power factor is

    8. A.
    1
    B.
    0.707 lagging
    C.
    0.5 lagging
    D.
    0.2 lagging

    View Answer

    Workspace

    Discuss Discuss in Forum

  8. The leads in a TRIAC are denoted by

    9. A.
    anode cathode, gate
    B.
    T1 T2, gate
    C.
    T1, T2, anode
    D.
    T1, T2, T3

    View Answer

    Workspace

    Discuss Discuss in Forum

  9. A step down cycloconverter has an input frequency f. If it uses natural commutation, the output frequency

    10. A.
    must be a sub-multiple of input frequency
    B.
    can be any frequency
    C.
    must be an even sub-multiple of input frequency
    D.
    must be an odd sub-multiple of input frequency

    View Answer

    Workspace

    Discuss Discuss in Forum

  10. In a single phase full wave regulator, the rms current in each thyristors is Ir The run load current is equal to

    11. A.
    2Ir
    B.
    2 Ir
    C.
    Ir
    D.

    View Answer

    Workspace

    Discuss Discuss in Forum

Java Programming Questions and Answers Interview Questions and Answers