Deck 10: Alternating Current Loads

Question 1

The greatest rate of current change occurs when the current passes from negative through zero and begins to increase in the positive direction.

Answer 1

True

Question 2

Inductive reactance is proportional to ____.

A) the number of turns of wire
B) voltage induced in other conductors
C) the source of the magnetic field
D) the source of the cutting action

Answer 2

A

Question 3

Resistive loads produce heat.

Answer 3

True

Question 4

Inductance (____) is one of the primary types of loads in alternating current circuits.

A) I
B) J
C) L
D) R

Question 5

VARs is an abbreviation for ____.

A) volt-amps-reactive
B) volt-amps-resistive
C) volt-alternating-reactive
D) volt-alternating-resistive

Question 6

An induced voltage ____ the applied voltage.

A) is always the same polarity as
B) is always opposite in polarity to
C) has no connection to
D) does not have polarity, like

Question 7

In a pure inductive circuit the current ____.

A) lags the voltage by 45 degrees
B) lags the voltage by 90 degrees
C) leads the voltage by 45 degrees
D) leads the voltage by 90 degrees

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) 0.366 A
B) 0.379 A
C) 0.398 A
D) 0.413 A

Question 9

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

A) AMPs
B) VARs
C) watts
D) RMSs

Question 10

Sometimes the current will rise and fall at the same rate as the voltage and will reverse the direction of flow when the voltage reverses polarity. In this condition, the current is said to be ____ with the voltage.

A) in phase
B) out of phase
C) resistive
D) inductive

Question 11

When magnetic lines of flux cut through a coil, a voltage is induced in the coil.

Question 12

How much voltage is necessary to push 0.8 A of current through 6 ohms of resistance?

A) 2.4 V
B) 3.6 V
C) 4.8 V
D) 5.0 V

Question 13

In a pure inductive circuit, ____.

A) the true power, or watts, is equal to the product of the voltage and reactance
B) the true power, or watts, is equal to the sum of the voltage and current
C) the true power, or watts, is equal to the product of the voltage and current
D) no true power or watts is produced

Question 14

The amount of induced voltage is proportional to the ____.

A) rate of change of charge
B) mass of the conductor
C) rate of change of current
D) resistance of the material

Question 15

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

A) resistance, R
B) reactance, R
C) resistance, X
D) reactance, X

Question 16

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

Question 17

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

A) the amount of circuit current
B) the length of the circuit
C) any alternating current sources
D) its capacitance

Question 18

True power, or watts, can be produced only when ____.

A) both current and voltage are either positive or negative
B) current is negative and voltage is positive
C) voltage is negative and current is positive
D) both current and voltage are zero

Question 19

A great amount of true power is produced in a pure inductive circuit.