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# Electrical Engineering - Inductors

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### Exercise

"Everyone is wise until he speaks."
- (Proverb)
11.

The winding resistance of a coil can be increased by

 A. increasing the number of turns B. using a thinner wire C. changing the core material D. increasing the number of turns or using thinner wire

12.

An inductance of 0.43 mH is smaller than

 A. 43 H B. 430 H C. 0.05 mH D. 0.00043 H

13.

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

 A. VR ≥ VL B. VL < VR C. VL = VR D. VL > VR

14.

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

 A. 1.8 mV B. 18 mV C. 180 mV D. 1.25 mV

15.

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

 A. increases B. decreases C. remains the same D. doubles