# NSCA - AC Circuits 1

40 Questions | Total Attempts: 250  Settings  NSCA - AC Circuits 1

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• 1.
What is the frequency of a waveform that repeats 10 times in a half second ?
• A.

10 Hz

• B.

5 Hz

• C.

500 hz

• D.

.5 Hz

• E.

.1 Hz

• 2.
Inductive reactance is measured in what ?
• A.

Impedance

• B.

Z

• C.

Series

• D.

Parallel

• E.

Ohms

• 3.
RMS power is ?
• A.

Average power

• B.

True power

• C.

Apparent power

• D.

Distributed power

• E.

Peak to Peak power

• 4.
How does DC react to a capacitor ?
• A.

• B.

Capacitance rises

• C.

It is blocked

• D.

Phase shift

• E.

Leakage

• 5.
How many alternations form a cycle ?
• A.

1

• B.

2

• C.

3

• D.

4

• E.

6

• 6.
Inductors in series are the same as ?
• A.

Resistors parallel

• B.

Capacitors is series

• C.

Overall impedance

• D.

Resistors in series

• E.

Lambda

• 7.
What is the wavelength of a waveform ?(Multiple)
• A.

The times per second a waveform repeats

• B.

Time for a waveform to complete one cycle

• C.

Used to average a waveform

• D.

The distance traveled by a waveform during one second

• E.

The Lambda of a waveform

• 8.
The portion of the apparent power caused by inductors and capacitors ?
• A.

Average power

• B.

Apparent power

• C.

Reactive power

• D.

True power

• E.

The power factor

• 9.
In a capacitance circuit what is the relationship of voltage and current ?
• A.

• B.

There is a phase shift

• C.

• D.

They are in phase

• E.

Reactance is created

• 10.
In an AC circuit with only resistance the current is ?
• A.

Always in phase with the voltage

• B.

180 out of phase with voltage

• C.

Leads the voltage by 180 degrees

• D.

Lags behind the voltage by 180 degrees

• E.

Peaked out

• 11.
In a capacitive circuit the charge and discharge current must ?
• A.

Be simultaneous

• B.

Be in one direction

• C.

Always be in different directions

• D.

Always be out of phase

• E.

Be in phase

• 12.
A Farad is a measurement of what ?
• A.

Inductance

• B.

Capacitance

• C.

Reactance

• D.

Resistance

• E.

Impedance

• 13.
The characteristic of an electrical circuit to oppose the change of current flow.
• A.

Resistance

• B.

Capacitance

• C.

Inductance

• D.

Impedance

• E.

Reactance

• 14.
Unlike a resistor there is no power dissipation in an ideal ?
• A.

Inductor

• B.

Circuit

• C.

Capacitor

• D.

Capacitance circuit

• E.

Dielectric

• 15.
A Henry is a measurement of what ?
• A.

Resitance

• B.

Capacitance

• C.

Impedance

• D.

Reactance

• E.

Impedance

• 16.
What is the formula for capacitance reactance ?
• A.

XC = f x c

• B.

XC = 6.28 x f x t

• C.

XC = 1 / 6.28 x f x c

• D.

XC = 6.28 x f x c

• E.

XC = Square root (XC squared + X squared)

• 17.
What is the period of a waveform with a frequency of 60hz ?
• A.

17 milliseconds

• B.

1.7 milliseconds

• C.

170 milliseconds

• D.

.17 seconds

• E.

1.7 seconds

• 18.
Capacitors in series are the same as ?
• A.

Inductors in parallel

• B.

Resistors in series

• C.

Total impedance

• D.

Reactance

• E.

Capacitance reactance

• 19.
Commercial power is always given in ?
• A.

Peak to Peak

• B.

Peak

• C.

Average

• D.

RMS

• E.

Periodic

• 20.
The power factor is relationship between what to figures ?
• A.

Average and true power

• B.

Reactance and average power

• C.

True and apparent power

• D.

Apparent and reactance power

• E.

Resistance and reactance

• 21.
In an inductive circuit what happens when frequency increases ?
• A.

No change

• B.

There is a reduction in inductance

• C.

There is an increase in inductance

• D.

There is an increase in inductive reactance

• E.

There is a decrease in inductive reactance

• 22.
What is the formula to find RMS voltage ?
• A.

RMS = Peak / .707

• B.

RMS = .707 x Peak

• C.

RMS = .637 x Peak

• D.

RMS = .077 x Peak

• E.

RMS = .7 X Peak

• 23.
On a current transformer which set of windings always has more turns ?
• A.

They are the same

• B.

The primary

• C.

The like-wound side

• D.

The secondary

• E.

The unlike-wound side

• 24.
How is a current transformer connected ?
• A.

In series

• B.

In parallel

• C.

In proximity

• D.

Across the differing phases

• E.

Wrapped

• 25.
The product of the source voltage and total current ?
• A.

Average power

• B.

Apparent power

• C.

Reactive power

• D.

True power

• E.

The power factor