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Electrical Engineering
Electrical Inductors
Quiz 1
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Q.1
An induced voltage is produced as a result of a dc voltage.
True
False
Q.2
Inductance is the property of an inductor that produces an opposition to any change in current.
True
False
Q.3
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
VR = VL
VL < VR
VL = VR
VL > VR
Q.4
A 320 µH coil is in series with a 3.3 kΩ resistor. How long does it take for current to build up to its full value?
0.48 s
0.48 ms
0.48 µs
48 s
Q.5
A 240 µH inductor is equivalent to a
0.240 mH inductor
0.000240 mH inductor
240 mH inductor
240 H inductor
Q.6
An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is
Good
Open
Shorted
Partly shorted
Q.7
The inductance of an iron-core coil decreases if
The number of turns is decreased
The iron core is removed
The length of the coil decreases
None of the above
Q.8
The permeability of a core material is an indication of the ability of the material to establish a magnetic field.
True
False
Q.9
Two inductors, L1 and L2, are in parallel. L1 has a value of 25 µH and L2 a value of 50 µH. The parallel combination is in series with L3, a 20 µH coil. The entire combination is across an ac source of 60 Vrms at 300 kHz. The total rms current is
87 mA
870 mA
87 A
337 mA
Q.10
When the current through an inductor decreases, the amount of energy stored in the electromagnetic field
Increases
Decreases
Remains the same
Doubles
Q.11
When the current through an inductor is cut in half, the amount of energy stored in the electromagnetic field
Is quartered
Quadruples
Doubles
Does not change
Q.12
The following coils are in parallel: 75 µH, 40 µH, 25 µH, and 15 µH. The total inductance is approximately
6.9 µH
14 µH
2.2 µH
155 µH
Q.13
Energy is stored by an inductor in an electrostatic field.
True
False
Q.14
XL is directly proportional to frequency and inductance.
True
False
Q.15
Faraday's law states that relative motion between a magnetic field and a coil induces a voltage across the coil.
True
False
Q.16
Inductance is indirectly proportional to the square of the number of turns, the permeability, and the cross-sectional area of the core.
True
False
Q.17
Inductors add in parallel.
True
False
Q.18
All coil cores are made of iron.
True
False
Q.19
The term 'choke' is more commonly used in connection with an inductor used to block off high frequencies.
True
False
Q.20
A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current
Is increased
Is decreased
Does not change
Momentarily goes to zero
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