1. The curve between frequency and current is known as
(A) voltage curve.
(B) power curve.
(C) resonance curve.
(D) load curve.
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2. Which of the following circuit element stores energy in the electromagnetic field ?
(A) Inductance.
(B) Condenser.
(C) Variable resistor.
(D) Resistance.
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3. The principle of dynamically induced emf is utilised in a
(A) choke.
(B) transformer.
(C) generator.
(D) therno-couple.
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4. A crack in the magnetic path of an inductor will result in
(A) unchanged inductance.
(B) increased inductance.
(C) zero inductance.
(D) reduced inductance.
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5. The principle of statically induced emf is utilised in a
(A) motor.
(B) transformer.
(C) generator.
(D) battery.
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6. When the current through an inductor decreases, the amount of energy stored in the electromagnetic field
(A) increases.
(B) decreases.
(C) remains the same.
(D) doubles.
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7. The permeability of a ferromagnetic material as compared with free space is
(A) greater.
(B) lesser.
(C) same.
(D) negligible.
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8. If the magnetic susceptibility of a material is positive then the material is
(A) para-magnetic.
(B) ferromagnetic.
(C) anti-ferromagnetic.
(D) any of the above.
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9. If the magnetic susceptibility of a material is negative then that material is
(A) para-magnetic.
(B) dielectric.
(C) ferromagnetic.
(D) anti-ferromagnetic.
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10. The total number of magnetic lines of force in a magnetic field is called
(A) magnetic flux density.
(B) magnetic flux intensity.
(C) magnetic potential.
(D) magnetic flux.
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11. The property of a material which opposes the magnetic flux in it is called
(A) resistance.
(B) impedance.
(C) reluctance.
(D) inductance.
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12. Cobalt is a
(A) paramagnetic material.
(B) diamagnetic material.
(C) ferromagnetic material.
(D) none magnetic material.
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13. The emission of electrons from hot bodies is called
(A) radiation effect.
(B) edison effect.
(C) skin effect.
(D) hall effect.
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14. Which of the following is a vector quantity?
(A) magnetic field.
(B) electric charge.
(C) energy.
(D) potential difference.
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15. The magnitude of statically induced emf depends on the
(A) coil resistance.
(B) flux magnitude.
(C) rate of change of flux.
(D) none of the above.
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