Question 1

What is the period of a 50 kHz sine wave?

Accepted Answer

A)  5 × 104 s 
B)  5 µs 
C)  20 µs 
D)  50 µs 
A)  5 × 104 s 
B)  5 µs 
C)  20 µs 
D)  50 µs

Question 2

A sine wave reaches its rms value of 70.7% of the peak voltage at an angle of how many radians?

Accepted Answer

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

Question 3

The coordinate system consists of:

Accepted Answer

A)  four quadrants 
B)  two perpendicular lines. 
C)  two axes, x and y 
D)  all of the above. 
A)  four quadrants 
B)  two perpendicular lines. 
C)  two axes, x and y 
D)  all of the above.

Question 4

A sine wave is the only waveform that contains no harmonics. All other waveforms are composed of a fundamental sine wave and harmonically related sine waves.

Accepted Answer

A) True 
 B)False

Question 5

A sine wave reaches half of its peak value at:

Accepted Answer

A)  90° 
B)  30° 
C)  60° 
D)  45° 
A)  90° 
B)  30° 
C)  60° 
D)  45°

Question 6

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

Accepted Answer

A)  1 Hz 
B)  1 kHz 
C)  1000 cycles per second 
D)  Both B and C are correct. 
A)  1 Hz 
B)  1 kHz 
C)  1000 cycles per second 
D)  Both B and C are correct.

Question 7

Increasing positive angles of a phasor move clockwise from the reference point.

Accepted Answer

A) True 
 B)False

Question 8

One radian equals:

Accepted Answer

A)  90° 
B)  57.3° 
C)  45° 
D)  114.6° 
A)  90° 
B)  57.3° 
C)  45° 
D)  114.6°

Question 9

When the phasor moves in the clockwise direction, the various angle positions are labeled as negative values.

Accepted Answer

A) True 
 B)False

Question 10

If the rms value of the waveform in Figure 11-4 is 12 V rms, what is the peak voltage?

Accepted Answer

A)  16.97 V 
B)  8.48 V 
C)  33.94 V 
D)  15.3 V 
A)  16.97 V 
B)  8.48 V 
C)  33.94 V 
D)  15.3 V

Question 11

The length of a phasor represents the amplitude.

Accepted Answer

A) True 
 B)False

Question 12

-Given the drawing in Figure 11-3, the phase shift between Waveform A and Waveform B is:

Accepted Answer

A)  180° 
B)  60° 
C)  90° 
D)  45° 
A)  180° 
B)  60° 
C)  90° 
D)  45°

Question 13

Phasor algebra for sinusoidal quantities is applicable only for waveforms which have different frequencies.

Accepted Answer

A) True 
 B)False

Question 14

The length of the phasor "arrow" represents the of a quantity.

Accepted Answer

A)  amplitude 
B)  frequency 
C)  angle 
D)  direction 
A)  amplitude 
B)  frequency 
C)  angle 
D)  direction

Question 15

On an oscilloscope display:

Accepted Answer

A)  a flat horizontal trace means voltage is constant. 
B)  a straight diagonal trace means voltage is changing at a steady rate. 
C)  all the above 
D)  voltage is on the vertical axis and time is on the horizontal axis. 
A)  a flat horizontal trace means voltage is constant. 
B)  a straight diagonal trace means voltage is changing at a steady rate. 
C)  all the above 
D)  voltage is on the vertical axis and time is on the horizontal axis.

Question 16

The instantaneous value of a sine wave voltage, at any point, is equal to the vertical distance from the tip of the phasor to the:

Accepted Answer

A)  horizontal axis 
B)  negative peak 
C)  positive peak 
D)  vertical axis 
A)  horizontal axis 
B)  negative peak 
C)  positive peak 
D)  vertical axis

Question 17

If the rms value of the waveform in Figure 11-4 is 10 V rms, what is the peak voltage?

Accepted Answer

A)  7.07 V 
B)  20 V 
C)  28.28 V 
D)  14.14 V 
A)  7.07 V 
B)  20 V 
C)  28.28 V 
D)  14.14 V

Question 18

A given rms value of a sine wave is equal to the same value of DC voltage with respect to the heat produced in a resistor.

Accepted Answer

A) True 
 B)False

What is the period of a 50 kHz sine wave?

A sine wave reaches its rms value of 70.7% of the peak voltage at an angle of how many radians?

The coordinate system consists of:

A sine wave is the only waveform that contains no harmonics. All other waveforms are composed of a fundamental sine wave and harmonically related sine waves.

A sine wave reaches half of its peak value at:

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

Increasing positive angles of a phasor move clockwise from the reference point.

One radian equals:

When the phasor moves in the clockwise direction, the various angle positions are labeled as negative values.

If the rms value of the waveform in Figure 11-4 is 12 V rms, what is the peak voltage?

The length of a phasor represents the amplitude.

-Given the drawing in Figure 11-3, the phase shift between Waveform A and Waveform B is:

Phasor algebra for sinusoidal quantities is applicable only for waveforms which have different frequencies.

The length of the phasor "arrow" represents the of a quantity.

On an oscilloscope display:

The instantaneous value of a sine wave voltage, at any point, is equal to the vertical distance from the tip of the phasor to the:

If the rms value of the waveform in Figure 11-4 is 10 V rms, what is the peak voltage?

A given rms value of a sine wave is equal to the same value of DC voltage with respect to the heat produced in a resistor.

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

Exam 11: Introduction to Alternating Current and Voltage

What is the period of a 50 kHz sine wave?

A sine wave reaches its rms value of 70.7% of the peak voltage at an angle of how many radians?

The coordinate system consists of:

A sine wave is the only waveform that contains no harmonics. All other waveforms are composed of a fundamental sine wave and harmonically related sine waves.

A sine wave reaches half of its peak value at:

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

Increasing positive angles of a phasor move clockwise from the reference point.

One radian equals:

When the phasor moves in the clockwise direction, the various angle positions are labeled as negative values.

If the rms value of the waveform in Figure 11-4 is 12 V rms, what is the peak voltage?

The length of a phasor represents the amplitude.

-Given the drawing in Figure 11-3, the phase shift between Waveform A and Waveform B is:

Phasor algebra for sinusoidal quantities is applicable only for waveforms which have different frequencies.

The length of the phasor "arrow" represents the of a quantity.

On an oscilloscope display:

The instantaneous value of a sine wave voltage, at any point, is equal to the vertical distance from the tip of the phasor to the:

If the rms value of the waveform in Figure 11-4 is 10 V rms, what is the peak voltage?

A given rms value of a sine wave is equal to the same value of DC voltage with respect to the heat produced in a resistor.

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