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ECE :: Electronic Devices and Circuits

Electronic Devices and Circuits - Section 1
Electronic Devices and Circuits - Section 2
Electronic Devices and Circuits - Section 3
Electronic Devices and Circuits - Section 4
Electronic Devices and Circuits - Section 5
Electronic Devices and Circuits - Section 6
Electronic Devices and Circuits - Section 7
Electronic Devices and Circuits - Section 8
Electronic Devices and Circuits - Section 9
Electronic Devices and Circuits - Section 10
Electronic Devices and Circuits - Section 11
Electronic Devices and Circuits - Section 12
Electronic Devices and Circuits - Section 13
Electronic Devices and Circuits - Section 14
Electronic Devices and Circuits - Section 15
Electronic Devices and Circuits - Section 16
Electronic Devices and Circuits - section-17
Electronic Devices and Circuits - Section-18

  1. The product kT (where k is Boltzmann's constant and T is absolute temperature) at room temperature is about

    2. A.
    0.051 eV
    B.
    0.026 eV
    C.
    0.01 eV
    D.
    0.001 eV

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  2. If E is energy level of electron and EF is fermi level, and T = 0 and E > EF, then

    3. A.
    the probability of finding an occupied quantum state of energy higher than EF is zero
    B.
    all quantum states with energies greater than EF are occupied
    C.
    some quantum states with energies greater than EF are occupied
    D.
    majority of quantum states with energies greater than EF are occupied

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  3. Which variety of copper has the best conductivity?

    4. A.
    Pure annealed copper
    B.
    Hard drawn copper
    C.
    Induction hardened copper
    D.
    Copper containing traces of silicon

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  4. In a JFET VDS exceeds the rated value. Then it operates in

    5. A.
    active region
    B.
    ohmic region
    C.
    cut off region
    D.
    either cut off or active region

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  5. Figure represents a

    6. A.
    Diode rectifier
    B.
    Schottky diode
    C.
    Varistor
    D.
    None of the above

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  6. The output, V-I characteristics of an Enhancement type MOSFET has

    7. A.
    only an ohmic region
    B.
    only a saturation region
    C.
    an ohmic region at low voltage value followed by a saturation region at higher voltages
    D.
    an ohmic region at large voltage values preceded by a saturation region at lower voltages

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  7. Piezoelectric quartz crystal resonators find application where

    8. A.
    signal amplification is required
    B.
    rectification of the signal is required
    C.
    signal frequency control is required
    D.
    modulation of signal is required

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  8. The forbidden energy gap between the valence band and conduction band will be least in case of

    9. A.
    metals
    B.
    semiconductors
    C.
    insulators
    D.
    all of the above

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  9. If too large current passes through the diode

    10. A.
    all electrons will leave
    B.
    all holes will freeze
    C.
    excessive heat may damage the diode
    D.
    diode will emit light

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  10. Figure shows the terminals of a transistor in plastic package TO 18. Then

    11. A.
    terminals 1, 2, 3 are emitter, collector, base respectively
    B.
    terminals 1, 2, 3 are emitter, base, collector respectively
    C.
    terminals 1, 2, 3 are base, emitter collector, respectively
    D.
    terminals 1, 2, 3 are collector, emitter, base respectively

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