INDUCTORS QUIZ

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

14 μH

155 μH

6.9 μH

2.2 μH

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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

VL = VR

VL > VR

VR ≥ VL

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The winding resistance of a coil can be increased by

increasing the number of turns or using thinner wire

using a thinner wire

increasing the number of turns

changing the core material

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An inductance of 0.08 μH is larger than

0.00008 mH

0.0000008 H

0.000008 H

0.000000008 H

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The inductance of an iron-core coil decreases if

the number of turns is decreased

the length of the coil decreases

the iron core is removed

None of these

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A 240 H inductor is equivalent to a

0.240 mH inductor

240 mH inductor

0.000240 mH inductor

240 H inductor

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The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is

1.25 mV

1.8 mV

18 mV

180 mV

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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

64 μH

8 H

32 μH

248 μH

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A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current

is decreased

momentarily goes to zero

does not change

is increased

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Three 15 mH inductors are in series. The total inductance is

45 mH

30 mH

5 mH

15 mH

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