Practice Test: Question Set - 05
1. The voltage induced across a certain coil is 200 mV. A 120 Ω resistor is connected to the coil terminals. The induced current is
- (A) 1.7 mA
- (B) 16 mA
- (C) 12 mA
- (D) 120 mA
2. Ferrites are materials.
- (A) Paramagnetic
- (B) Diamagnetic
- (C) Ferromagnetic
- (D) None of the above
3. A material which is slightly repelled by a magnetic field is known as
- (A) Ferromagnetic material
- (B) Diamagnetic material
- (C) Paramagnetic material
- (D) Conducting material
4. What is the flux density when the flux is 5.5 μWb and the cross-sectional area is 6 × 10–3 m2?
- (A) 91.7 μT
- (B) 917 μT
- (C) 91 T
- (D) 9.7 T
5. Materials subjected to rapid reversal of magnetism should have
- (A) High coercivity and low density
- (B) High permeability and low hysteresis loss
- (C) High coercivity and high retentivity
- (D) None of these
6. Reluctance in a magnetic circuit is analogous to current in an electrical circuit.
- (A) True
- (B) False
7. Which of the following is a ferromagnetic material?
- (A) Tungsten
- (B) Aluminium
- (C) Copper
- (D) Nickel
8. The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is
- (A) 1000 V
- (B) 2000 V
- (C) 31.25 V
- (D) 3125 V
9. A magnetic field is made up of flux lines.
- (A) True
- (B) False
10. The ability of a material to remain magnetized after removal of the magnetizing force is known as
- (A) Permeability
- (B) Reluctance
- (C) Hysteresis
- (D) Retentivity
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