Practice Test: Question Set - 06
1. The working of a meter is based on the use of a permanent magnet. In order to protect the meter functioning from stray magnetic fields
- (A) Meter is surrounded by strong magnetic
fields
- (B) A soft iron shielding is used
- (C) A plastic shielding is provided
- (D) A shielding of anon-magnetic material is
used
2. If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density
- (A) Increases
- (B) Decreases
- (C) Remains the same
- (D) Doubles
3. Out of the following statements, concerning an electric field, which statement is not true?
- (A) The electric intensity is a vector quantity
- (B) The electric field intensity at a point is
numerically equal to the force exerted upon a charge placed at that point
- (C) An electric field is defined as a point in
space at which an electric charge would experience a force
- (D) Unit field intensity in the exertion of a
force of one Newton on a charge of one coulomb
4. The induced voltage across a stationary conductor in a stationary magnetic field is
- (A) Zero
- (B) Reversed in
polarity
- (C) Increased
- (D) Decreased
5. The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength?
- (A) 2500 AT/m
- (B) 250 AT/m
- (C) 25 AT/m
- (D) 2.5 AT/m
6. The relative permeability of materials is not constant.
- (A) Diamagnetic
- (B) Paramagnetic
- (C) Ferromagnetic
- (D) Insulating
7. The tesla is the unit of magnetic flux.
- (A) True
- (B) False
8. What is the reluctance of a material that has a length of 0.07 m, a cross-sectional area of 0.014 m2, and a permeability of 4,500 μWb/At × m?
- (A) 1111 At/Wb
- (B) 111 At/Wb
- (C) 11 At/Wb
- (D) 1 At/Wb
9. The bar magnet has
- (A) The dipole moment
- (B) Monopole moment
- (C) Both (A) and (B)
- (D) None of the above
10. The magneto-motive force is
- (A) The voltage across the two ends of exciting
coil
- (B) The flow of an electric current
- (C) The sum of all currents embraced by one line
of magnetic field
- (D) The passage of magnetic field through an
exciting coil
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