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ECE :: Electronic Devices and Circuits

  1. The I/P impedance (Zi) and the O/P impedance (Zo) of an ideal trans conductance (Voltage controlled current source) amplifier are

  2. A.
    Zi = 0, Zo = 0
    B.
    Zi = 0, Zo = ∞
    C.
    Zi = ∞, Zo = 0
    D.
    Zi = ∞, Zo = ∞

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  3. The relation between thermionic emission current and temperature is known as

  4. A.
    Richardson Dushman equation
    B.
    Langmuir child law
    C.
    Ohm's law
    D.
    Boltzmann's law

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  5. Assertion (A): When forward biased a p-n junction has low resistance.

    Reason (R): The ratio is called dynamic resistance.

  6. A.
    Both A and R are true and R is correct explanation of A
    B.
    Both A and R are true but R is not a correct explanation of A
    C.
    A is true but R is false
    D.
    A is false but R is true

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  7. Assertion (A): JFET is a voltage controlled device.

    Reason (R): The drain current can be controlled by controlling VGS.

  8. A.
    Both A and R are true and R is correct explanation of A
    B.
    Both A and R are true but R is not a correct explanation of A
    C.
    A is true but R is false
    D.
    A is false but R is true

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  9. For a P-N junction diode, the current in reverse bias may be

  10. A.
    few amperes
    B.
    between 0.5 A and 1 A
    C.
    few milliamperes
    D.
    few micro or nanoamperes

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  11. Greatest mobility can be expected in case of

  12. A.
    holes
    B.
    protons
    C.
    electrons
    D.
    negative ions

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  13. An enhancement mode MOSFET is off when the gate voltage is

  14. A.
    zero
    B.
    negative
    C.
    less than threshold value
    D.
    none of the above

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  15. When atoms are held together by the sharing of valence electrons

  16. A.
    each atom becomes free to move
    B.
    neutrons start shifting
    C.
    they form a covalent bond
    D.
    some of the electrons are lost

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  17. Thermal runaway is not possible in FET, because as the temperature of FET increases.

  18. A.
    the mobility decreases
    B.
    the transconductance increases
    C.
    impedance of the source
    D.
    power dissipation in the chip

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  19. Which of the following pairs of semiconductors and current carriers is correctly matched?

  20. A.
    Intrinsic : number of electrons = number of holes
    B.
    P type : number of electrons > number of holes
    C.
    N type : number of electrons < number of holes
    D.
    Bulk : neither electrons nor holes

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