Question 1

The phase difference between sine waves of different frequencies is:

Accepted Answer

A)  the same throughout time 
B)  constantly changing. 
C)  the difference in their fixed time displacement 
D)  equal to their frequency differences. 
A)  the same throughout time 
B)  constantly changing. 
C)  the difference in their fixed time displacement 
D)  equal to their frequency differences.

Question 2

-Refer to Figure 11-3. The phase shift between Waveform A and Waveform B expressed in Radians is:

Accepted Answer

A)  n/4 rad 
B)  2n/6 rad 
C)  2n rad 
D)  n/2 rad 
A)  n/4 rad 
B)  2n/6 rad 
C)  2n rad 
D)  n/2 rad

Question 3

If a sine wave signal measured 100 mV peak-to-peak, how many volts would be read by a voltmeter?

Accepted Answer

A)  63.7 mV 
B)  14.14 mV 
C)  70.7 mV 
D)  35.4 mV 
A)  63.7 mV 
B)  14.14 mV 
C)  70.7 mV 
D)  35.4 mV

Question 4

The angular position of a phasor represents the amplitude of a sine wave.

Accepted Answer

A) True 
 B)False

Question 5

-For Waveform A, you count 4 divisions on the Vertical axis on the scope. The Volts-per-division knob is set to 50 mV/Div. Given the drawing in Figure 11-2, what is the Peak-to-peak amplitude of Waveform A?

Accepted Answer

A)  500 mV 
B)  250 mV 
C)  0.2 V 
D)  50 mV 
A)  500 mV 
B)  250 mV 
C)  0.2 V 
D)  50 mV

Question 6

Which of the following expresses angular velocity?

Accepted Answer

A)  2n/T 
B)  f/T 
C)  n/T 
D)  2n × T 
A)  2n/T 
B)  f/T 
C)  n/T 
D)  2n × T

Question 7

The Period of the waveform in Figure 11-4 is:

Accepted Answer

A)  0.5 mS 
B)  1 kHz 
C)  1.0 mS 
D)  100 Hz 
A)  0.5 mS 
B)  1 kHz 
C)  1.0 mS 
D)  100 Hz

Question 8

The average value of a sine wave is zero.

Accepted Answer

A) True 
 B)False

Question 9

The length of a phasor is called the magnitude.

Accepted Answer

A) True 
 B)False

Question 10

If the rms value of the waveform in Figure 11-4 is 100 V rms, what is the peak voltage?

Accepted Answer

A)  70.07 V 
B)  288.28 V 
C)  200 V 
D)  141.4 V 
A)  70.07 V 
B)  288.28 V 
C)  200 V 
D)  141.4 V

Question 11

The equivalent negative angle for a positive angle of 30 degrees is:

Accepted Answer

A)  330 degrees 
B)  -330 degrees 
C)  -60 degrees 
D)  -150 degrees 
A)  330 degrees 
B)  -330 degrees 
C)  -60 degrees 
D)  -150 degrees

Question 12

A harmonic frequency is always an integral odd or even) multiple of the fundamental frequency.

Accepted Answer

A) True 
 B)False

Question 13

Determine the instantaneous value of a sine wave whose rms is 20 V, and phase angle is -297 degrees.

Accepted Answer

A)  -17.8 V 
B)  -25.2 V 
C)  +17.8 V 
D)  +25.2 V 
A)  -17.8 V 
B)  -25.2 V 
C)  +17.8 V 
D)  +25.2 V

Question 14

The velocity of rotation is called:

Accepted Answer

A)  the frequency 
B)  the angular velocity 
C)  the wavelength 
D)  the speed 
A)  the frequency 
B)  the angular velocity 
C)  the wavelength 
D)  the speed

Question 15

The equation for finding the Period, when the frequency is known is:

Accepted Answer

A)  T = 1/f 
B)  T = n/2f) 
C)  T = 0.707f 
D)  f = 1/T 
A)  T = 1/f 
B)  T = n/2f) 
C)  T = 0.707f 
D)  f = 1/T

Question 16

-Refer to Figure 11-3. Waveforms A and B have the same frequency, but appear to have different amplitudes. Is this possible?

Accepted Answer

A)  No 
B)  Yes 
A)  No 
B)  Yes

Question 17

Frequency is the reciprocal of the period.

Accepted Answer

A) True 
 B)False

Question 18

The length of a phasor is represented by the formula v = Vpsin 0.

Accepted Answer

A) True 
 B)False

Question 19

If the effective voltage of an ac receptacle is 120 V, what is the peak-to-peak voltage?

Accepted Answer

A)  84.8 V 
B)  169.7 V 
C)  339.4 V 
D)  240 V 
A)  84.8 V 
B)  169.7 V 
C)  339.4 V 
D)  240 V

Question 20

A sawtooth voltage waveform has a linear ramp changing voltage level with respect to time.

Accepted Answer

A) True 
 B)False

Exam 11: Introduction to Alternating Current and Voltage

The phase difference between sine waves of different frequencies is:

-Refer to Figure 11-3. The phase shift between Waveform A and Waveform B expressed in Radians is:

If a sine wave signal measured 100 mV peak-to-peak, how many volts would be read by a voltmeter?

The angular position of a phasor represents the amplitude of a sine wave.

-For Waveform A, you count 4 divisions on the Vertical axis on the scope. The Volts-per-division knob is set to 50 mV/Div. Given the drawing in Figure 11-2, what is the Peak-to-peak amplitude of Waveform A?

Which of the following expresses angular velocity?

The Period of the waveform in Figure 11-4 is:

The average value of a sine wave is zero.

The length of a phasor is called the magnitude.

If the rms value of the waveform in Figure 11-4 is 100 V rms, what is the peak voltage?

The equivalent negative angle for a positive angle of 30 degrees is:

A harmonic frequency is always an integral odd or even) multiple of the fundamental frequency.

Determine the instantaneous value of a sine wave whose rms is 20 V, and phase angle is -297 degrees.

The velocity of rotation is called:

The equation for finding the Period, when the frequency is known is:

-Refer to Figure 11-3. Waveforms A and B have the same frequency, but appear to have different amplitudes. Is this possible?

Frequency is the reciprocal of the period.

The length of a phasor is represented by the formula v = Vpsin 0.

If the effective voltage of an ac receptacle is 120 V, what is the peak-to-peak voltage?

A sawtooth voltage waveform has a linear ramp changing voltage level with respect to time.

Quantities and Units

Voltage, Current, and Resistance

Ohms Law

Energy and Power

Series Circuits

Parallel Circuits

Series-Parallel Circuits

Circuit Theorems and Conversions

Branch, Loop, and Node Analyses

Magnetism and Electromagnetism

Capacitors

Inductors

Transformers

Rc Circuits

Rl Circuits

Rlc Circuits and Resonance

Passive Filters

Circuit Theorems in Ac Analysis

Time Response of Reactive Circuits

Three-Phase Systems in Power Applications

Filters