Electrical Engineering - Inductors

Exercise :: Inductors - General Questions

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: Option D

Explanation:

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12. 

An inductance of 0.43 mH is smaller than

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

Answer: Option C

Explanation:

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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. VRVL
B. VL < VR
C. VL = VR
D. VL > VR

Answer: Option 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

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

Answer: Option B

Explanation:

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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: Option B

Explanation:

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