A.C. Circuits Study Guide

What is the instantaneous voltage at 42 degrees on a 230Vp sine wave?

• 115V

• 154V

• 76.1V

• 149V

Which one of the following represents the value at point G in figure 8-1

• the peak voltage

• the RMS voltage

• the frequency

• the period

The square wave is made up of:

• The fundamental frequency and all the even harmonics.

• The fundamental frequency and all the odd harmonics.

• Just the fundamental frequency.

• The fundamental frequency and both the odd and even harmonics.

Troubleshooting an AC circuit can be performed with which of the following tools?

• Oscilloscope

• Digital Multimeter

• Analog voltmeter

• All of the above

Superimposed DC and AC voltages mean the two voltages are combined:

• in series-parallel aiding or opposing.

• in parallel aiding or opposing.

• in series aiding or opposing.

• All of these

Which point in figure 8-1 is 180 degrees away from point E?

• A

• B

• C

• D

If R1 shorts in Figure 8-2, VR2...

• increases

• remains the same

• decreases

Calculate current total in figure 8-2.

• 6.44mApp

• 9.12mApp

• 4.55mApp

• 3.22mApp

If a 10 K Ohm resistor carries 5 mARMS of current, its voltage drop equals...

• 7.07 VRMS

• 50 VRMS

• 70.7 VRMS

• 5 VRMS

The time required by a 10V square wave to change from 1V to 9V is known as the...

• fall time

• pulse width

• period

• rise time