Deck 17: Inductance in Alternating Current Circuits

Question 1

Volt-amperes-reactive is used to measure the in a pure inductive circuit.

A) watts
B) reactive power
C) volt amperes
D) joules

Answer 1

B

Question 2

An inductor is connected to a 240-V, 60-Hz supply. The current in the circuit is 5 A. What is the inductance of the inductor?

A) .0048 H
B) .0075 H
C) .1185 H
D) .127 H

Answer 2

D

Question 3

In a pure inductive circuit, current .

A) lags voltage by 90°
B) leads voltage by 90°
C) is in phase with voltage
D) lags voltage by 180°

Answer 3

A

Question 4

Two inductors are connected in parallel to a 120-V, 60-Hz supply. The values of the inductors are 0.15 H and 0.225 H. The total inductive reactance is .

A) 3.54 A
B) 4.84 A
C) 5.41 A
D) 6.12 A

Question 5

The symbol XL stands for _.

A) resistance
B) inductive resistance
C) inductive reactance
D) resistive reactance

Question 6

Two inductors are connected in series to a 120-V, 60-Hz supply. The values of the inductors are 0.175 H and 0.255 H. The total circuit current is .

A) 0.74 A
B) 1.02 A
C) 1.85 A
D) 3.067 A

Question 7

The current-limiting property of an inductor is called .

A) resistance
B) inductance
C) reactance
D) henrys

Question 8

Circuits are generally considered to contain when any type of load that contains a coil is used.

A) inductance
B) reactance
C) resistance
D) volt-amperes

Question 9

The amount of resistance compared with the inductive reactance determines the of the coil.

A) power factor (PF)
B) quality (Q)
C) phase angle (θ)
D) reactance (X)

Question 10

Two inductors are connected in parallel to a 120-V, 60-Hz supply. The values of the inductors are 1.5 H and 2.5 H. The total inductive reactance is .

A) 525.5 Ω
B) 533.49 Ω
C) 942.5 Ω
D) 1508 Ω

Question 11

The symbol for reactive power of an inductor is .

A) W
B) VA
C) VARs
D) P

Question 12

An inductor is connected to a 120-V, 60-Hz supply. The current in the circuit is 2.4 A. What is the inductive reactance?

A) 57.08 Ω
B) 104.8 Ω
C) 288 Ω
D) 904.8 Ω

Question 13

The symbol for reactance is .

A) RL
B) XL
C) L
D) H

Question 14

An inductor with an inductance of three henrys (H) is to be connected to a 60 Hz circuit. What will the inductive reactance be?

A) 180 Ω
B) 360 Ω
C) 565 Ω
D) 1131 Ω

Question 15

An inductor is connected to a 60 Hz circuit. The inductive reactance is 75.4 Ω. What is the inductance of the inductor?

A) 0.2 H
B) 5 H
C) 284 H
D) 4524 H

Question 16

The unit of inductance is the .

A) reactance
B) henry
C) ohm
D) hertz

Question 17

An inductor has an inductive reactance of 64 Ω, and a wire resistance of 36 Ω. What is the impedance of the inductor?

A) 10 Ω
B) 28 Ω
C) 73.4 Ω
D) 82.92 Ω

Question 18

The total current-limiting effect is called .

A) reluctance
B) impedance
C) resistive reactance
D) inductive resistance

Question 19

When a magnetic field continually changes magnitude and direction, a voltage is continually being induced in the coil. This voltage is called voltage.

A) conducted
B) induced
C) applied
D) inductive

Question 20

Two inductors are connected in series to a 120-V, 60-Hz supply. The values of the inductors are 1.5 H and 2.5 H. The total inductive reactance is .

A) 42.5 Ω
B) 365.5 Ω
C) 553.44 Ω
D) 1508 Ω

Question 21

An inductor has an inductive reactance of 12 Ω, and a wire resistance of 16 Ω. What is the impedance of the inductor?

A) 4 Ω
B) 20 Ω
C) 28 Ω
D) 400 Ω