Magnetism Electrical Objective Questions - Set 07 - ObjectiveBooks

Magnetism Electrical Objective Questions - Set 07

Practice Test: Question Set - 07


1. What is the flux density in a magnetic field in which the flux in 0.1 m2 is 600 μWb?
    (A) 6,000 μT
    (B) 600 μT
    (C) 600 T
    (D) 6 T

2. For which of the following materials the net magnetic moment should be zero?
    (A) Diamagnetic materials
    (B) Ferrimagnetic materials
    (C) Antiferromagnetic materials
    (D) Anti-Ferrimagnetic materials

3. Core of an electromagnet should have
    (A) Low coercivity
    (B) High susceptibility
    (C) Both of the above
    (D) None of the above

4. Hysteresis is the number of lines of force per unit area in a magnetic field.
    (A) True
    (B) False

5. The initial permeability of an iron rod is
    (A) The highest permeability of the iron rod
    (B) The lowest permeability of the iron rod
    (C) The permeability at the end of the iron rod
    (D) The permeability almost in non-magnetized state

6. A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be
    (A) M
    (B) M/2
    (C) 2 M
    (D) M/4

7. The unit of flux is the same as that of
    (A) Reluctance
    (B) Resistance
    (C) Permeance
    (D) Pole strength

8. One tesla is equal to
    (A) 1 Wb/mm2
    (B) 1 Wb/m
    (C) 1 Wb/m2
    (D) 1 mWb/m2

9. In the left hand rule, forefinger always represents
    (A) Voltage
    (B) Current
    (C) Magnetic field
    (D) Direction of force on the conductor

10. The left hand rule correlates to
    (A) Current, induced e.m.f. and direction of force on a conductor
    (B) Magnetic field, electric field and direction of force on a conductor
    (C) Self induction, mutual induction and direction of force on a conductor
    (D) Current, magnetic field and direction of force on a conductor

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