# Electronics - Inductors

### Exercise :: Inductors - General Questions

43.

A practical inductor

 A. has inductance B. has winding resistance C. has winding capacitance D. all of the above

Explanation:

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44.

When current in an inductor starts to change, it cannot react instantly due to:

 A. fixed coil resistance B. eddy current generation C. applied emf of the circuit D. the counter emf of the coil

Explanation:

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45.

What is the approximate time for a complete decay of 400 mA of inductor current, when R = 10 ohms and L = 20 H?

 A. 10 seconds B. 8 seconds C. 4 seconds D. 2 seconds

Explanation:

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46.

A utility pole transformer used to supply a residential customer with two phases uses:

 A. two phases on the primary B. a center tap on the secondary C. a separate ground for each phase D. a small coefficient of coupling

Explanation:

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47.

What is the inductive reactance?

 A. 5.2 B. 7.5 C. 1.3 k D. 7.5 k

Explanation:

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48.

When a coil collapses the induced circuit current will:

 A. be in the same direction B. go to zero C. aid counter emf buildup D. be in the opposite direction

Explanation:

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49.

When a rate of one ampere per second causes an induced voltage of one volt, the unit of measure is

 A. a lenz B. an ohm C. a farad D. a henry