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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. Which element exhibits the property of inertia?

    2. A.
    Resistance
    B.
    Capacitance
    C.
    Inductance
    D.
    Both resistance and inductance

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  2. For a permanent magnetic material

    3. A.
    the residual induction and coercive field should be large
    B.
    the residual induction and coercive field should be small
    C.
    area of hysteresis loop should be small
    D.
    initial relative permeability should be high

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  3. In a coaxial cable, braided copper is used for

    4. A.
    conductor
    B.
    shield
    C.
    dielectric
    D.
    jacket

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  4. The hysteresis phenomenon in ferromagnetic materials exists at all temperatures.

    5. A.
    True
    B.
    False

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  5. Assertion (A): Magnetic susceptibility of diamagnetic materials is much less than that of paramagnetic materials.

    Reason (R): For diamagnetic as well as paramagnetic materials, μr is nearly equal to 1.

    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. The attraction between the nucleus and valence electron of copper atom is

    7. A.
    zero
    B.
    weak
    C.
    strong
    D.
    either zero or strong

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  7. If the temperature of an extrinsic semiconductor is increased so that the intrinsic carrier concentration is doubled, then

    8. A.
    the majority carrier density is doubled
    B.
    the minority carrier density is doubled
    C.
    the minority carrier density becomes 4 times the original value
    D.
    both the majority and minority carrier densities double

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  8. There is no hysteresis phenomenon is any dielectric material.

    9. A.
    True
    B.
    False

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  9. The units of μ0 and μr are

    10. A.
    H/m for both
    B.
    H/m for μr and no units for μ0
    C.
    H/m for μ0 and no units for μr
    D.
    Wb/m for μ0 and no units for μr

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  10. In metals the valence electron wave functions are strongly perturbed by the presence of neighbouring atoms.

    11. A.
    True
    B.
    False

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