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ECE :: Materials and Components

Materials and Components - Section 1
Materials and Components - Section 2
Materials and Components - Section 3
Materials and Components - Section 4
Materials and Components - Section 5
Materials and Components - Section 6
Materials and Components - Section 7
Materials and Components - Section 8
Materials and Components - Section 9

  1. At a very low temperature, a semiconductor

    2. A.
    becomes a conductor
    B.
    becomes an insulator
    C.
    may become a conductor or an insulator
    D.
    will remain a semiconductor becomes a conductor or an insulator

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  2. The colour code on a carbon resistor is red-red-black-silver. The value of resistor is

    3. A.
    22000 Ω
    B.
    2200 Ω
    C.
    22 ± 5% Ω
    D.
    22 ± 10% Ω

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  3. Some typical examples of macroscopic quantities are

    4. A.
    conductivity
    B.
    µr
    C.
    dielectric constant
    D.
    all of the above

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  4. The temperature coefficient of a thermistor

    5. A.
    is positive
    B.
    is negative
    C.
    zero
    D.
    may be positive or negative depending on its composition

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  5. Assertion (A): Helium, Argon and Neon are gaseous at room temperature.

    Reason (R): The atoms in Helium, Argon and Neon are chemically extremely inactive.

    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 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. Resistivity of rubber is about

    7. A.
    102 Ω-m
    B.
    10-2 Ω-m
    C.
    5 x 108 Ω m
    D.
    5 x 1012 Ω-m

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  7. An iron specimen has µr = 1000 when B = 0.3 T. If B = 0.35 T, µr

    8. A.
    will be 1000
    B.
    will be less than 1000
    C.
    will be more than 1000
    D.
    may be more or less than 1000

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  8. Which solid dielectric has highest temperature limit?

    9. A.
    E
    B.
    H
    C.
    C
    D.
    F

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  9. Permeability is analogous to

    10. A.
    resistivity
    B.
    retentivity
    C.
    conductivity
    D.
    coercivity

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  10. The colour code on a carbon resistor is green-blue-yellow. The tolerance is

    11. A.
    ± 5%
    B.
    ± 10%
    C.
    ± 20%
    D.
    ± 30%

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