Magnetism and Electromagnetism Multiple Choice Practices - Set 10 - ObjectiveBooks

Magnetism and Electromagnetism Multiple Choice Practices - Set 10

Practice Test: Question Set - 10


1. Which of the following type of materials are not very important for engineering applications?
    (A) Ferromagnetic
    (B) Paramagnetic
    (C) Diamagnetic
    (D) None of the above

2. The direction of magnetic lines of force is
    (A) From South Pole to North Pole
    (B) From North Pole to South Pole
    (C) From one end of the magnet to another
    (D) None of the above

3. The use of permanent magnets is not made in
    (A) Magnetos
    (B) Energy meters
    (C) Transformers
    (D) Loudspeakers

4. The Biot Savart's law is a general modification of
    (A) Kirchhoff’s law
    (B) Lenz's law
    (C) Ampere's law
    (D) Faraday's laws

5. Lenz's law defines the polarity of the induced voltage.
    (A) True
    (B) False

6. In a simple magnetic field the strength of magnet flux
    (A) Is constant and has same value in energy part of the magnetic field
    (B) Increases continuously from initial value to final value
    (C) Decreases continuously from initial value to final value
    (D) First increases and then decreases till it becomes zero

7. The attraction capacity of electromagnet will increase if the
    (A) Core length increases
    (B) Core area increases
    (C) Flux density decreases
    (D) Flux density increases

8. The materials having low retentivity are suitable for making
    (A) Weak magnets
    (B) Temporary magnets
    (C) Permanent magnets
    (D) None of the above

9. The main constituent of Permalloy is
    (A) Cobalt
    (B) Chromium
    (C) Nickel
    (D) Tungsten

10. Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be
    (A) 100 N
    (B) 10 N
    (C) 1 N
    (D) 0.1 N

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