Question 1

In a pure inductive circuit, current _____.

Accepted Answer

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

Question 2

The current-limiting property of an inductor is called _____.

Accepted Answer

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

Question 3

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?

Accepted Answer

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

Question 4

The symbol for reactance is _____.

Accepted Answer

A)  R L 
B)  X L 
C)  L 
D)  H 
A)  R L 
B)  X L 
C)  L 
D)  H

Question 5

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

Accepted Answer

A)  180 Ω 
B)  360 Ω 
C)  565 Ω 
D)  1131 Ω 
A)  180 Ω 
B)  360 Ω 
C)  565 Ω 
D)  1131 Ω

Question 6

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

Accepted Answer

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

Question 7

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?

Accepted Answer

A)  57.08 Ω 
B)  104.8 Ω 
C)  288 Ω 
D)  50  Ω 
A)  57.08 Ω 
B)  104.8 Ω 
C)  288 Ω 
D)  50  Ω

Question 8

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 _____.

Accepted Answer

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

Question 9

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

Accepted Answer

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

Question 10

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 _____.

Accepted Answer

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

Question 11

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

Accepted Answer

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

Question 12

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 _____.

Accepted Answer

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

Question 13

The symbol for reactive power of an inductor is _____.

Accepted Answer

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

Question 14

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

Accepted Answer

A)  10 Ω 
B)  28 Ω 
C)  73.4 Ω 
D)  82.92 Ω 
A)  10 Ω 
B)  28 Ω 
C)  73.4 Ω 
D)  82.92 Ω

Question 15

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 _____.

Accepted Answer

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

Question 16

The unit of inductance is the _____.

Accepted Answer

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

Question 17

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

Accepted Answer

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

Question 18

The total current-limiting effect is called _____.

Accepted Answer

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

Question 19

The symbol XL stands for _____.

Accepted Answer

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

Question 20

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

Accepted Answer

A)  4 Ω 
B)  20 Ω 
C)  28 Ω 
D)  400 Ω 
A)  4 Ω 
B)  20 Ω 
C)  28 Ω 
D)  400 Ω

Exam 17: Inductance in Alternating Current Circuits

In a pure inductive circuit, current _____.

The current-limiting property of an inductor is called _____.

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?

The symbol for reactance is _____.

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

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

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?

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 _____.

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

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 _____.

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

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 _____.

The symbol for reactive power of an inductor is _____.

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

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 _____.

The unit of inductance is the _____.

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

The total current-limiting effect is called _____.

The symbol XL stands for _____.

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

Atomic Structure

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Kirchhoffs Law, Thevenins and Nortons Theorems

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The symbol X_L stands for _____.