Online Quiz Questions Magnetism & Electromagnetism - Set 05 - ObjectiveBooks

Online Quiz Questions Magnetism & Electromagnetism - Set 05

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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