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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. Assertion (A): In a BJT, adc is about 0.98.

    Reason (R): In a BJT, recombination in base region is high.

    2. 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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  2. Wienbridge oscillator uses

    3. A.
    -ve feedback
    B.
    +ve feedback
    C.
    both +ve, -ve feedback
    D.
    feedback is not required

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  3. Which of the following material is preferred for transformer cores operating in micro wave frequency range?

    4. A.
    Ferrites
    B.
    Silicon steel
    C.
    Superalloy
    D.
    Copper

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  4. Photoelectric emitters in photo tubes are generally made of

    5. A.
    alkali metals
    B.
    metals
    C.
    semiconductors
    D.
    metal and semiconductors

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  5. Assertion (A): Power transistors are more commonly of silicon npn type.

    Reason (R): The fabrication of silicon npn transistors is easy.

    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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  6. In N-type semiconductor

    7. A.
    electrons are majority carriers while holes are minority carriers
    B.
    electrons are majority carriers while holes are majority carriers
    C.
    both electrons as well as holes are majority carriers
    D.
    both electrons as well as holes are minority carriers

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  7. The addition of n type impurity to intrinsic material creates allowable energy levels.

    8. A.
    slightly below conduction band
    B.
    slightly above conduction band
    C.
    slightly below valence band
    D.
    slightly above valence band

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  8. Which of the following elements act as donor impurities?

    1. Gold
    2. Phosphorus
    3. Boron
    4. Antimony
    5. Arsenic
    6. Indium
    Select the correct answer using the codes given below:

    9. A.
    1, 2, 3
    B.
    1, 2, 4, 6
    C.
    3, 4, 5, 6
    D.
    2, 4, 5

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