Electrical Inductors MCQ Test - Set 01 - ObjectiveBooks

# Practice Test: Question Set - 01

1. When the current through an inductor decreases, the amount of energy stored in the electromagnetic field
(A) Increases
(B) Decreases
(C) Remains the same
(D) Doubles

2. An inductor, a 1 kΩ resistor, and a switch are connected in series across a 6 V battery. At the instant the switch is closed, the inductor voltage is
(A) 0 V
(B) 6 V
(C) 12 V
(D) 4 V

3. The inductance of an iron-core coil decreases if
(A) The number of turns is decreased
(B) The iron core is removed
(C) The length of the coil decreases
(D) None of the above

4. Inductance is the property of an inductor that produces an opposition to any change in current.
(A) True
(B) False

5. The voltage across a coil when di/dt = 20 mA/μs and L = 8 μH is
(A) 16 mV
(B) 160 mV
(C) 1.6 mV
(D) 2.5 mV

6. Energy is stored by an inductor in an electrostatic field.
(A) True
(B) False

7. A 240 μH inductor is equivalent to a
(A) 0.240 mH inductor
(B) 0.000240 mH inductor
(C) 240 mH inductor
(D) 240 H inductor

8. Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals?
(A) 219 kΩ
(B) 66 kΩ
(C) 660 kΩ
(D) 1.3 MΩ

9. An inductance of 0.43 mH is smaller than
(A) 43 μH
(B) 430 μH
(C) 0.05 H
(D) 0.00043 H

10. Five inductors are connected in series. The lowest value is 8 μH. If the value of each inductor is twice that of the preceding one, and if the inductors are connected in order of ascending values, the total inductance is
(A) 8 H
(B) 32 μH
(C) 64 μH
(D) 248 μH

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