Inductors - General Questions

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Inductors - General Questions

1.

When the current through an inductor is cut in half, the amount of energy stored in the electromagnetic field

A.	is quartered
B.	quadruples
C.	doubles
D.	does not change

Answer: Option A

Explanation:

No answer description available for this question.

2.

The following coils are in parallel: 75 H, 40 H, 25 H, and 15 H. The total inductance is approximately

A.	6.9 μH
B.	14 μH
C.	2.2 μH
D.	155 μH

Answer: Option A

Explanation:

No answer description available for this question.

3.

The inductance of an iron-core coil decreases if

A.	the number of turns is decreased
B.	the iron core is removed
C.	the length of the coil decreases
D.	none of the above

Answer: Option A

Explanation:

No answer description available for this question.

4.

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:

No answer description available for this question.

5.

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 μs
D.	48 s

Answer: Option C

Explanation:

No answer description available for this question.

6.

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:

No answer description available for this question.

7.

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:

No answer description available for this question.

8.

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:

No answer description available for this question.

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