Deck 3: Inductance in Alternating-Current Circuits

Question 1

____ is an induced voltage and is, therefore, proportional to the three factors that determine induced voltage.

A) Reactive conductance
B) Conductive reactance
C) Reactive inductance
D) Inductive reactance

Answer 1

D

Question 2

Three inductors are connected in series. Inductor 1 has an inductance of 0.6 H, inductor 2 has an inductance of 0.4 H, and inductor 3 has an inductance of 0.5 H. The total inductance of the circuit is ____ H.

A) 0.5
B) 1.5
C) 3.0
D) 4.5

Answer 2

B

Question 3

A total current-limiting effect is called impedance and is symbolized by the letter Z.

Answer 3

True

Question 4

Three inductors are connected in parallel. Inductor 1 has an inductance of 2.5 H, inductor 2 has an inductance of 1.8 H, and inductor 3 has an inductance of 1.2 H. The total inductance of this circuit is ____H.

A) 0.186
B) 0.559
C) 1.789
D) 5.5

Question 5

The current-limiting property of the inductor is called reactance and is symbolized by the letter ____.

A) A
B) C
C) R
D) X

Question 6

Assume an inductor with a negligible resistance is connected to a 36-V, 400-Hz line. If the circuit has a current flow of 0.2 A, the inductance of the inductor is 0.0716 H.

Question 7

In a pure inductive circuit, the current lags the voltage by ____.

A) 45°
B) 90°
C) 135°
D) 180°

Question 8

An inductor has an inductance of 0.8 H and is connected to a 120-V, 60-Hz line. How much current will flow in this circuit if the wire resistance of the inductor is negligible?

A) 0.398 A
B) 0.796 A
C) 1.25 A
D) 2.51 A

Question 9

In a pure inductive circuit, the true power, or wattage, is equal to the product of the voltage and current. In a pure resistive circuit, however, no true power is produced.

Question 10

The amount of ____ voltage in an inductor can be computed if the resistance of the wire in the coil and the amount of circuit current are known.

A) conducted
B) induced
C) reduced
D) initiated

Question 11

The amount of induced voltage in an inductor can be computed if the resistance of the wire in the coil and the amount of circuit current are known.

Question 12

If the values of all the inductors are the same, total inductance can be found by using the following formula: LT = N / L.

Question 13

A formula that can be used to find the total inductance of parallel inductors is LT = ____.

A) (L1 x L2) / (L1 + L2)
B) (L1 + L2) / (L1 x L2)
C) L1 x L2
D) L1 + L2

Question 14

The formula for Ohm's Law is ____.

A) R = E x I
B) E = I / R
C) E = I x R
D) I = R / E

Question 15

Some amount of inductance is present in all alternating-current circuits because the magnetic field does not change.

Question 16

The schematic symbol used to represent an inductor depicts a coil of wire.

Question 17

Reactance is caused by inductance, so it is called reactive inductance.

Question 18

Since induced voltage is always in opposition to applied voltage, the applied voltage must overcome the induced voltage before current can flow through the circuit.

Question 19

An electrical measurement called ____ is used to measure the reactive power in a pure inductive circuit.

A) RAVs
B) AVRs
C) VRAs
D) VARs

Question 20

When inductors are connected in series, the total inductance of the circuit (LT) equals the sum of the inductances of all the inductors divided by the number of inductors.