ANTONYMS QUIZ

The inductance of an iron-core coil decreases if

the iron core is removed

the number of turns is decreased

the length of the coil decreases

None of these

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

16 mV

2.5 mV

1.6 mV

160 mV

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An inductance of 0.08 μH is larger than

0.000008 H

0.000000008 H

0.0000008 H

0.00008 mH

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When the current through an inductor decreases, the amount of energy stored in the electromagnetic field

increases

doubles

remains the same

decreases

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A 240 H inductor is equivalent to a

240 mH inductor

0.240 mH inductor

0.000240 mH inductor

240 H inductor

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An inductor, a 1 k resistor, and a switch are connected in series across a 6 V battery. At the instant the switch is closed, the inductor voltage is

4 V

6 V

12 V

0 V

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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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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

6.9 μH

155 μH

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

5 mH

45 mH

15 mH

30 mH

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