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# Electronics - Inductors

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### Exercise

"Everyone is wise until he speaks."
- (Proverb)
8.

In a purely inductive circuit,

 A. current leads voltage by 90° B. voltage lags current by 90° C. voltage leads current by 90° D. voltage and current are in phase (0°)

9.

A series RL filter circuit with an output across the inductor will result in what type of filtering?

 A. passing of the higher frequencies B. passing of the lower frequencies C. blocking of the higher frequencies D. blocking of a certain range of frequencies

10.

What is the total inductance in the given circuit?

 A. 160 mH B. 300 mH C. 900 mH D. 1700 mH

11.

On a schematic, dashed lines between two vertical coils usually mean the transformer has:

 A. an air core B. an iron core C. a nonmetallic core D. a ferrite core

12.

 A. direction of the induced voltage produces an opposition B. direction of an induced current produces an aiding effect C. emf depends on the rate of cutting flux D. emf is related to the direction of the current

13.

A henry value divided by a circuit resistive value provides the:

 A. counter emf value B. induced voltage amplitude C. rise or decay time constant D. quality factor of the coil

14.