INDUCTORS QUIZ

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

30 mH

5 mH

15 mH

45 mH

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YOUR ANSWER : ?

The inductance of an iron-core coil decreases if

the number of turns is decreased

the length of the coil decreases

None of these

the iron core is removed

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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

8 H

32 μH

64 μH

248 μH

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A 5 mH, a 4.3 mH, and a 0.6 mH inductor are connected in parallel. The total inductance is

greater than 5 mH

9.9 mH

less than 0.6 mH

9.9 mH or greater than 5 mH

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The voltage across a coil when di/dt = 20 mA/s and L = 8 H is

1.6 mV

2.5 mV

16 mV

160 mV

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

14 μH

2.2 μH

155 μH

6.9 μH

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

is decreased

does not change

momentarily goes to zero

is increased

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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

100 mA

1 mA

10 mA

1 A

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A 240 H inductor is equivalent to a

240 H inductor

0.000240 mH inductor

240 mH inductor

0.240 mH inductor

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