Practice Test: Question Set - 02
1. The direction of a magnetic field within a magnet is
- (A) From south
to north
- (B) From north
to south
- (C) Back to
front
- (D) Front to
back
2. A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T; The force on the conductor will be
- (A) 240 N
- (B) 24 N
- (C) 2.4 N
- (D) 0.24 N
3. Electromagnetic induction is the force that produces a magnetic field.
- (A) True
- (B) False
4. A square cross-sectional magnet has a pole strength of 1 × 10 Wb and cross sectional area of 20 mm × 20 mm. What is the strength at a distance of 100 mm from the unit pole in air?
- (A) 63.38 N/Wb
- (B) 633.8 N/Wb
- (C) 6338 N/Wb
- (D) 63380 N/Wb
5. The commonly used material for shielding or screening magnetism is
- (A) Copper
- (B) Aluminium
- (C) Soft iron
- (D) Brass
6. The unit for reluctance is
- (A) Tesla
- (B) At/Wb
- (C) At/m
- (D) Wb
7. Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials.
- (A) Circular
- (B) Triangular
- (C) Rectangular
- (D) None of the above
8. An electromagnetic field exists only when there is
- (A) An
increasing current
- (B) Decreasing
current
- (C) Voltage
- (D) Current
9. What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200?
- (A) 2
- (B) 4
- (C) 6
- (D) 8
10. The susceptibility of paramagnetic materials generally lies between
- (A) KT3 and 1CT6
- (B) 1CT3 and 1CT7
- (C) KT4 and KT8
- (D) 10"2 and KT5
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