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

Answer: Option C

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

Answer: Option C

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

Answer: Option B

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

Answer: Option C

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

Answer: Option D

Explanation:

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