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ECE :: Electronic Devices and Circuits

  1. No load d.c. output will be least in case of

  2. A.
    half wave rectifier
    B.
    full wave rectifier
    C.
    bridge rectifier
    D.
    three phase full wave rectifier

  3. When an electron breaks a covalent bond and moves away,

  4. A.
    a hole is created
    B.
    a proton is also lost
    C.
    atom becomes an ion
    D.
    rest of the electron move at a faster rate

  5. A photo diode is

  6. A.
    forward biased
    B.
    reverse biased
    C.
    either forward or reverse biased
    D.
    unbiased

  7. Germanium and Si phosphorus have their maximum spectral response in the

  8. A.
    infrared region
    B.
    ultraviolet region
    C.
    visible region
    D.
    X-ray region

  9. In which condition does BJT behave like a closed switch?

  10. A.
    Cut off
    B.
    Saturation
    C.
    Forward active
    D.
    Reverse active

  11. High purity copper is obtained by

  12. A.
    rolling casting
    B.
    casting
    C.
    electrolytic refining
    D.
    induction heating

  13. Photo electric emission can occur only if the frequency of light is more than threshold frequency.

  14. A.
    True
    B.
    False

  15. In a JFET the width of channel is controlled by

  16. A.
    gate voltage
    B.
    drain current
    C.
    source current
    D.
    all of the above

  17. The unit of thermal resistance of a semi-conductor device is

  18. A.
    Ohms
    B.
    Ohms/°C
    C.
    °C/ohm
    D.
    °C/watt

  19. Figure represents a

  20. A.
    Varactor
    B.
    LED
    C.
    Zener diode
    D.
    Temperature dependent diode