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
- (B) Quadruples
- (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 Ω 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 μH 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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