Electrical Engineering - Inductors
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
Answer: D
Explanation:
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12.
An inductance of 0.43 mH is smaller than
Answer: D
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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
Answer: D
Explanation:
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14.
The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil is
Answer: A
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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
Answer: B
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