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Inductors

Inductors
An 18 V power supply is connected across a coil with a winding resistance of 180 . Current flow in the coil is

100 mA
1 A
1 mA
10 mA

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Inductors
A 320 H coil is in series with a 3.3 k resistor. How long does it take for current to build up to its full value?

0.48 ms
0.48 s
0.48 μs
48 s

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Inductors
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

VL > VR
VR ≥ VL
VL < VR
VL = VR

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Inductors
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

248 μH
32 μH
64 μH
8 H

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Inductors
The following coils are in parallel: 75 H, 40 H, 25 H, and 15 H. The total inductance is approximately

6.9 μH
155 μH
2.2 μH
14 μH

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Inductors
Two inductors, L1 and L2, are in parallel. L1 has a value of 25 H and L2 a value of 50 H. The parallel combination is in series with L3, a 20 H coil. The entire combination is across an ac source of 60 Vrms at 300 kHz. The total rms current is

87 A
870 mA
87 mA
337 mA

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