Electrical Inductors - Study Mode

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[#1] 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

Correct Answer

(C) Shorted

[#2] When the current through an inductor decreases, the amount of energy stored in the electromagnetic field

(A) Increases

(B) Decreases

(C) Remains the same

(D) Doubles

Correct Answer

(B) Decreases

[#3] 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

Correct Answer

(A) Is quartered

[#4] The following coils are in parallel: 75 µH, 40 µH, 25 µH, and 15 µH. The total inductance is approximately

(A) 6.9 µH

(B) 14 µH

(C) 2.2 µH

(D) 155 µH

Correct Answer

(A) 6.9 µH

[#5] Inductors add in parallel.

(A) True

(B) False

Correct Answer

(B) False