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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. The magnetic quantum number determines the component of angular momentum along a prescribed direction.

    2. A.
    True
    B.
    False

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  2. An electron is moving around a proton, in a circle of radius R. If flux density in the region is increased from zero to B, the force on the electron is

    3. A.
    B.
    eR (dB / dt)
    C.
    eRB
    D.

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  3. Wood is a diamagnetic material.

    4. A.
    True
    B.
    False

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  4. Curie Weiss law is .

    5. A.
    True
    B.
    False

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  5. Consider the following materials

    1. Nickel
    2. Silver
    3. Oxygen
    4. Aluminium
    The correct sequence in the order of decreasing permeability is

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

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  6. The unit for mmf is

    7. A.
    A
    B.
    Wb
    C.
    T
    D.
    V

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  7. A magnetic field exists around

    8. A.
    moving charges
    B.
    static charges
    C.
    iron
    D.
    copper

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  8. A conductor carries 10 A current in + x direction and is lying in a field having a flux density 0.2 T directed along + z direction. The magnitude of force per metre length and direction are

    9. A.
    2 N, + y direction
    B.
    2 N, - y direction
    C.
    0.02 N, + y direction
    D.
    0.02 N, - y direction

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  9. The residual resistivity of a binary alloy at 0 K is

    10. A.
    sum of residual resistivities of component metals
    B.
    difference of residual resistivities of component metals
    C.
    product of residual resistivities of component metals
    D.
    dependent on the concentration of minor component in the alloy

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  10. The resistance of a photoconductor

    11. A.
    increases with increase in light intensity
    B.
    decreases with increase in light intensity
    C.
    may increase or decrease with increase in light intensity
    D.
    remains constant

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