Question 1

____ are caused by voltages induced into the conductors and other surrounding metal parts.&#10;A) Hysteresis currents&#10;B) Skin currents&#10;C) Dielectric currents&#10;D) Eddy currents

Accepted Answer

Eddy currents are caused by changing magnetic fields inducing voltages into conductors and surrounding metal parts, leading to circular currents in those materials.

Question 2

Most circuits contain more than pure resistance, pure inductance, or pure capacitance; therefore, each path of a parallel circuit must be treated as a separate ____ circuit.&#10;A) series&#10;B) parallel&#10;C) RC&#10;D) RL

Accepted Answer

Each path of a parallel circuit must be treated as a separate series circuit because each path can have its own combination of resistance, inductance, and capacitance, which need to be analyzed in series within that path.

Question 3

In resonant circuits, at a certain frequency, the reactance of the coil is equal to the reactance of the capacitor, and the combined reactance is zero.

Accepted Answer

At resonance in a series resonant circuit, the inductive reactance (XL) is equal to the capacitive reactance (XC), and their effects cancel each other out, making the total reactance (XL - XC) equal to zero.

Question 4

____ is a factor affecting the amount of current flowing in a pure resistive circuit.&#10;A) DC resistance&#10;B) Inductance effect&#10;C) Skin stress&#10;D) Applied voltage

Accepted Answer

The answer of ____ is a factor affecting the amount...

Question 5

Resistive heating units and incandescent lighting are considered to be pure resistive loads.

Accepted Answer

Both resistive heating units and incandescent lighting convert electrical energy directly into heat (and light, in the case of incandescent bulbs), without any reactive power component, making them pure resistive loads.

Question 6

A resonant circuit contains resistance, inductance, and ____.&#10;A) stress&#10;B) hysteresis&#10;C) capacitance&#10;D) reactance

Accepted Answer

A resonant circuit, specifically an RLC circuit, contains resistance (R), inductance (L), and capacitance (C) as its fundamental components.

Question 7

The nameplate information on a piece of electrical equipment includes the rating in kilovolt-amperes or kilowatts, voltage, amperes, and ____.&#10;A) static charge&#10;B) place of manufacture&#10;C) frequency&#10;D) resistance

Accepted Answer

The nameplate information on electrical equipment typically includes the rating in kilovolt-amperes or kilowatts, voltage, amperes, and frequency, as these are essential for understanding the electrical characteristics and requirements of the equipment.

Question 8

Maintaining a(n) ____ power factor provides a more efficient operation.&#10;A) low&#10;B) high&#10;C) zero&#10;D) negative

Accepted Answer

Maintaining a high power factor is crucial for efficient operation because it means that the electrical power is being used effectively, with less power wasted in the form of reactive power.

Question 9

____ are often more practical for power factor improvement than capacitors are because they can drive a mechanical load as well as develop a leading power factor.&#10;A) Synchronous motors&#10;B) Induction motors&#10;C) Feeder conductors&#10;D) Transformers

Accepted Answer

Synchronous motors can be operated in a way that they develop a leading power factor, making them useful for power factor improvement. Additionally, they can drive a mechanical load, which makes them more versatile and practical for certain applications compared to capacitors, which only serve to adjust power factor without providing mechanical work.

Question 10

The true power is also called effective power because it has a direct effect on the load.

Accepted Answer

True power, measured in watts (W), is called effective power because it represents the actual power that performs work or generates heat in a load, distinguishing it from reactive and apparent power in AC circuits.

Question 11

For parallel AC circuits, at any instant, the current is the same value across all branches of a parallel AC circuit, and is equal to the supply current at that instant.

Accepted Answer

The answer of For parallel AC circuits, at any instant,...

Question 12

The combined resistance of an AC series circuit is equal to the ____ of the individual resistances of the circuit.&#10;A) sum&#10;B) difference&#10;C) product&#10;D) ratio

Accepted Answer

The answer of The combined resistance of an AC series...

Question 13

When a circuit contains inductive components, these components contain both resistance and inductive ____.&#10;A) resistance&#10;B) reactance&#10;C) stress&#10;D) frequency

Accepted Answer

The answer of When a circuit contains inductive components, these...

Question 14

An RL parallel circuit is a circuit with branches containing resistance and ____.&#10;A) capacitance&#10;B) hysteresis&#10;C) voltage&#10;D) inductance

Accepted Answer

The answer of An RL parallel circuit is a circuit...

Question 15

To solve RLC parallel circuits, the RL portion is usually solved first, and then the LC or RC portion is considered.

Accepted Answer

The answer of To solve RLC parallel circuits, the RL...

Deck 8: Ac Circuits