Online MCQ on Electrical Inductors - Set 02 - ObjectiveBooks

Practice Test: Question Set - 02

1. When the current through an inductor is cut in half, the amount of energy stored in the electromagnetic field
(A) Is quartered
(C) Doubles
(D) Does not change

2. A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current
(A) Is increased
(B) Is decreased
(C) Does not change
(D) Momentarily goes to zero

3. An induced voltage is produced as a result of a dc voltage.
(A) True
(B) False

4. An inductor and a resistor are in series with a sine wave voltage source. The frequency is set so that the inductive reactance is equal to the resistance. If the frequency is increased, then
(A) VR ≥ VL
(B) VL VR
(C) VL = VR
(D) VL > VR

5. Inductance is indirectly proportional to the square of the number of turns, the permeability, and the cross-sectional area of the core.
(A) True
(B) False

6. A switch, a 220 Î© resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?
(A) 91 mA
(B) 78 mA
(C) 57 mA
(D) 400 mA

7. The term ‘choke’ is more commonly used in connection with an inductor used to block off high frequencies.
(A) True
(B) False

8. An inductance of 0.08 Î¼H is larger than
(A) 0.0000008 H
(B) 0.000000008 H
(C) 0.000008 H
(D) 0.00008 mH

9. The permeability of a core material is an indication of the ability of the material to establish a magnetic field.
(A) True
(B) False

10. An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is
(A) Good
(B) Open
(C) Shorted
(D) Partly shorted

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