INDUCTORS QUIZ

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

64 μH

8 H

32 μH

TRUE ANSWER : ?
YOUR ANSWER : ?

An inductance of 0.08 μH is larger than

0.0000008 H

0.00008 mH

0.000000008 H

0.000008 H

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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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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

VR ≥ VL

VL = VR

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An inductance of 0.43 mH is smaller than

43 μH

430 μH

0.05 H

0.00043 H

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

10 mA

1 A

1 mA

100 mA

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The winding resistance of a coil can be increased by

using a thinner wire

increasing the number of turns

changing the core material

increasing the number of turns or using thinner wire

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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

180 mV

1.8 mV

18 mV

1.25 mV

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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

48 s

0.48 μs

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

45 mH

30 mH

15 mH

5 mH

TRUE ANSWER : ?
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