# Electrical Engineering - Inductors

### Exercise :: Inductors - General Questions

16.

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

 A. 15 mH B. 30 mH C. 45 mH D. 5 mH

Explanation:

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17.

An 18 V power supply is connected across a coil with a winding resistance of 180 . Current flow in the coil is

 A. 1 mA B. 10 mA C. 100 mA D. 1 A

Explanation:

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18.

A switch, a 220 resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?

 A. 91 mA B. 78 mA C. 57 mA D. 400 mA

Explanation:

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19.

A 320 H coil is in series with a 3.3 k resistor. How long does it take for current to build up to its full value?

 A. 0.48 s B. 0.48 ms C. 0.48 s D. 48 s

Explanation:

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20.

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

 A. 8 H B. 32 μH C. 64 μH D. 248 μH