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ECE :: Electronic Devices and Circuits

  1. The threshold voltage of an n-channel enhancement mode MOSFET is 0.5 when the device is biased at a gate voltage of 3V. Pinch off would occur at a drain voltage of

  2. A.
    1.5 V
    B.
    2.5 V
    C.
    3.5 V
    D.
    4.5 V

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  3. Which of these has degenerate p and n materials?

  4. A.
    Zener diode
    B.
    PIN diode
    C.
    Tunnel diode
    D.
    Photo diode

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  5. A Schottky diode clamp is used along with switching BJT for

  6. A.
    reducing the power dissipation
    B.
    reducing the switching time
    C.
    increasing the value of β
    D.
    reducing the base current

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  7. From the given circuit below, we can conclude that.

  8. A.
    BJT is pnp
    B.
    BJT is npn
    C.
    transistor is faulty
    D.
    not possible to determined

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  9. In a piezoelectric crystal, applications of a mechanical stress would produce

  10. A.
    plastic deformation of the crystal
    B.
    magnetic dipoles in the crystal
    C.
    electrical polarization in the crystal
    D.
    shift in the Fermi level

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  11. In which of the following is the width of junction barrier very small?

  12. A.
    Tunnel diode
    B.
    Photo diode
    C.
    PIN diode
    D.
    Schottky diode

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  13. If the reverse voltage across a p-n junction is increased three times, the junction capacitance

  14. A.
    will decrease
    B.
    will increase
    C.
    will decrease by an approximate factor of about 2
    D.
    will increase by an approximate factor of about 2

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  15. Which of these has highly doped p and n region?

  16. A.
    PIN diode
    B.
    Tunnel diode
    C.
    Schottky diode
    D.
    Photodiode

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  17. Measurement of Hall coefficient enables the determination of

  18. A.
    recovery time of stored carrier
    B.
    type of conductivity and concentration of charge carriers
    C.
    temperature coefficient and thermal conductivity
    D.
    Fermi level and forbidden energy gap

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  19. The units for transconductance are

  20. A.
    ohms
    B.
    amperes
    C.
    volts
    D.
    siemens

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