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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