Electrical Engineering - Inductors

Exercise :: Inductors - General Questions

6. 

A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the current

A. is increased
B. is decreased
C. does not change
D. momentarily goes to zero

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

7. 

Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals?

A. 219 k
B. 66 k
C. 660 k
D. 1.3 M

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

8. 

An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor is

A. good
B. open
C. shorted
D. partly shorted

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

9. 

Two inductors, L1 and L2, are in parallel. L1 has a value of 25 H and L2 a value of 50 H. The parallel combination is in series with L3, a 20 H coil. The entire combination is across an ac source of 60 Vrms at 300 kHz. The total rms current is

A. 87 mA
B. 870 mA
C. 87 A
D. 337 mA

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.

10. 

An inductor, a 1 k resistor, and a switch are connected in series across a 6 V battery. At the instant the switch is closed, the inductor voltage is

A. 0 V
B. 6 V
C. 12 V
D. 4 V

Answer: Option B

Explanation:

No answer description available for this question. Let us discuss.