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ECE :: Materials and Components

  1. A vacuum parallel plate capacitor is charged. The field between the plates is 2 x 104 V/m. If the space between the plates is filled with a material having ∈r = 10, then the value of field in the dielectric will be

  2. A.
    2 x 103 V/m
    B.
    x 104 V/m
    C.
    210 x 104 V/m
    D.
    2 x 105 V/m

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  3. Which inductor is linear?

  4. A.
    Air cored
    B.
    Cast iron cored
    C.
    Sheet steel cored
    D.
    Iron alloy cored

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  5. The two conductors of a transmission line carry equal current I in opposite direction. The force on each conductor is

  6. A.
    proportional to I
    B.
    proportional to I2
    C.
    proportional to distance between the lines
    D.
    proportional to I3

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  7. Which inductor is used at high frequencies?

  8. A.
    Cast iron cored
    B.
    Sheet steel cored
    C.
    Iron alloy cored
    D.
    Ceramic cored

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  9. Magnetisation of a material is the magnetic dipole moment per m3.

  10. A.
    True
    B.
    False

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  11. On the basis of the type of chemical bonds, solids may be classified into

  12. A.
    ionic crystals
    B.
    ionic and valence crystals
    C.
    ionic crystal, valence crystals and metals
    D.
    ionic crystals, valence crystals, metal and vander wall crystals

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  13. The units for intrinsic strength of dielectric are

  14. A.
    kV
    B.
    kV/m
    C.
    A
    D.
    A/m

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  15. Specific resistance of silver is about

  16. A.
    0.16 x 10-8 Ω-m
    B.
    1.64 x 10-8 Ω-m
    C.
    16 x 10-8 Ω-m
    D.
    164 x 10-8 Ω-m

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  17. The v-i relation for an arc is v = 44 + . If v = 50 V, i =

  18. A.
    10 A
    B.
    5 A
    C.
    2 A
    D.
    0.5 A

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  19. Assertion (A): If an electron having charge e is revolving in an orbit of radius R and with angular velocity ω, the magnetic dipole moment of orbit is 0.5 eωR2.

    Reason (R): Orbital angular momentum and magnetic dipole moment are always equal.

  20. 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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