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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