Question 1

-In Figure 8 -1, if the time from point A to H is 60 µs the frequency is .

Accepted Answer

A) 16.7 kHz 
B) 50 kHz 
C) 25 kHz 
D) More information is required to calculate the frequency. 
A) 16.7 kHz 
B) 50 kHz 
C) 25 kHz 
D) More information is required to calculate the frequency.

Question 2

The value of a AC sine wave at any instant can be represented by:

Accepted Answer

A) a graph of the voltage or current vs. the angular measurement. 
B) the formula Vi = Vp × sin 0. 
C) a phasor whose angle and magnitude are representative of the AC signal. 
D) all of these. 
A) a graph of the voltage or current vs. the angular measurement. 
B) the formula Vi = Vp × sin 0. 
C) a phasor whose angle and magnitude are representative of the AC signal. 
D) all of these.

Question 3

An oscilloscope's volts/division switch is set on 50 mV/div. If the vertical deflection of the oscilloscope's trace is 1.6 division, what voltage is being measured?

Accepted Answer

A) 1.6 mV 
B) 80 mV 
C) 0.008 V 
D) 50 mV 
A) 1.6 mV 
B) 80 mV 
C) 0.008 V 
D) 50 mV

Question 4

One complete sine wave contains 360°.

Accepted Answer

A) True 
 B)False

Question 5

What type of sensor is used by a clamp meter to measure dc current?

Accepted Answer

A) transformer action 
B) Hall -effect 
C) inductive 
D) inverter 
A) transformer action 
B) Hall -effect 
C) inductive 
D) inverter

Question 6

-Calculate VR1 in Figure 8 -2.

Accepted Answer

A) 21.4 VP 
B) 6.84 VP 
C) 13.7 VP 
D) 13.2 VP 
A) 21.4 VP 
B) 6.84 VP 
C) 13.7 VP 
D) 13.2 VP

Question 7

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

Accepted Answer

A) in series -parallel aiding or opposing. 
B) in series aiding or opposing. 
C) in parallel aiding or opposing. 
D) all of these 
A) in series -parallel aiding or opposing. 
B) in series aiding or opposing. 
C) in parallel aiding or opposing. 
D) all of these

Question 8

The AC sine wave varies from zero to its maximum value in accordance with:

Accepted Answer

A) an algebraic function. 
B) a geometric progression. 
C) a trigonometric relationship. 
D) a mathematical formula. 
A) an algebraic function. 
B) a geometric progression. 
C) a trigonometric relationship. 
D) a mathematical formula.

Question 9

Iif you want to test a system for its frequency response you would probably employ a(n)

Accepted Answer

A) arbitrary function generator 
B) swept -frequency oscillator 
C) multifunction singal generator 
D) custom -pattern generator 
A) arbitrary function generator 
B) swept -frequency oscillator 
C) multifunction singal generator 
D) custom -pattern generator

Question 10

An ac current is inversely proportional to an ac voltage.

Accepted Answer

A) True 
 B)False

Question 11

20 Vrms of alternating current will illuminate a given lamp at the same intensity as 20 V of direct current.

Accepted Answer

A) True 
 B)False

Question 12

The period of a 5 Hz wave form is 200 ms.

Accepted Answer

A) True 
 B)False

Question 13

-What is the approximate peak input voltage to the circuit in Figure 8 -2?

Accepted Answer

A) 20 VP 
B) 14.1 VP 
C) 28.3 VP 
D) 10 VP 
A) 20 VP 
B) 14.1 VP 
C) 28.3 VP 
D) 10 VP

Question 14

What is the instantaneous voltage at 42° on a 230 VP sine wave?

Accepted Answer

A) 149 V 
B) 154 V 
C) 115 V 
D) 76.1 V 
A) 149 V 
B) 154 V 
C) 115 V 
D) 76.1 V

Question 15

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

Accepted Answer

A) rise time 
B) pulse width 
C) period 
D) fall time 
A) rise time 
B) pulse width 
C) period 
D) fall time

Question 16

The average value of a rectangular pulse wave is calculated as:

Accepted Answer

A) Vavg = Vbaseline + (duty cycle)× Vp. 
B) Vavg = Vbaseline + Vp. 
C) Vavg = 1.57 Vp. 
D) Vavg = 0.637 Vp. 
A) Vavg = Vbaseline + (duty cycle)× Vp. 
B) Vavg = Vbaseline + Vp. 
C) Vavg = 1.57 Vp. 
D) Vavg = 0.637 Vp.

Question 17

7.07 VPP is approximately equal to 2.5 VRMS.

Accepted Answer

A) True 
 B)False

Question 18

A square wave is a unique form of the rectangular pulse wave in that:

Accepted Answer

A) the duty cycle is 50%. 
B) the positive and negative halves are equal. 
C) the wave is symmetrical. 
D) all of these 
A) the duty cycle is 50%. 
B) the positive and negative halves are equal. 
C) the wave is symmetrical. 
D) all of these

Question 19

A 12 VP sine wave equals _ _.

Accepted Answer

A) 8.48 VRMS 
B) 7.64 VAVG 
C) 24 VPP 
D) all of these 
A) 8.48 VRMS 
B) 7.64 VAVG 
C) 24 VPP 
D) all of these

Question 20

In a two -resistor series circuit VR1 = 6.5 VRMS and VR2 = 3.2 VRMS. The source voltage is .

Accepted Answer

A) 9.19 VP 
B) 13.7 VP 
C) 9.7 VP 
D) 4.53 VP 
A) 9.19 VP 
B) 13.7 VP 
C) 9.7 VP 
D) 4.53 VP

-In Figure 8 -1, if the time from point A to H is 60 µs the frequency is .

The value of a AC sine wave at any instant can be represented by:

An oscilloscope's volts/division switch is set on 50 mV/div. If the vertical deflection of the oscilloscope's trace is 1.6 division, what voltage is being measured?

One complete sine wave contains 360°.

What type of sensor is used by a clamp meter to measure dc current?

-Calculate VR1 in Figure 8 -2.

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

The AC sine wave varies from zero to its maximum value in accordance with:

Iif you want to test a system for its frequency response you would probably employ a(n)

An ac current is inversely proportional to an ac voltage.

20 Vrms of alternating current will illuminate a given lamp at the same intensity as 20 V of direct current.

The period of a 5 Hz wave form is 200 ms.

-What is the approximate peak input voltage to the circuit in Figure 8 -2?

What is the instantaneous voltage at 42° on a 230 VP sine wave?

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

The average value of a rectangular pulse wave is calculated as:

7.07 VPP is approximately equal to 2.5 VRMS.

A square wave is a unique form of the rectangular pulse wave in that:

A 12 VP sine wave equals _ _.

In a two -resistor series circuit VR1 = 6.5 VRMS and VR2 = 3.2 VRMS. The source voltage is .

Systems, Quantities, and Units

Voltage, Current, and Resistance

Ohms Law, Energy, and Power

Series Circuits

Parallel Circuits

Series-Parallel Circuits

Magnetism and Electromagnetism

Capacitors

Rccircuits

Inductors

Rlcircuits

Rlccircuits and Resonance

Transformers

Time Response of Reactive Circuits

Filters

Exam 8: Introduction to Alternating Current and Voltage

-In Figure 8 -1, if the time from point A to H is 60 µs the frequency is .

The value of a AC sine wave at any instant can be represented by:

An oscilloscope's volts/division switch is set on 50 mV/div. If the vertical deflection of the oscilloscope's trace is 1.6 division, what voltage is being measured?

One complete sine wave contains 360°.

What type of sensor is used by a clamp meter to measure dc current?

-Calculate VR1 in Figure 8 -2.

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

The AC sine wave varies from zero to its maximum value in accordance with:

Iif you want to test a system for its frequency response you would probably employ a(n)

An ac current is inversely proportional to an ac voltage.

20 Vrms of alternating current will illuminate a given lamp at the same intensity as 20 V of direct current.

The period of a 5 Hz wave form is 200 ms.

-What is the approximate peak input voltage to the circuit in Figure 8 -2?

What is the instantaneous voltage at 42° on a 230 VP sine wave?

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

The average value of a rectangular pulse wave is calculated as:

7.07 VPP is approximately equal to 2.5 VRMS.

A square wave is a unique form of the rectangular pulse wave in that:

A 12 VP sine wave equals _ _.

In a two -resistor series circuit VR1 = 6.5 VRMS and VR2 = 3.2 VRMS. The source voltage is .

Systems, Quantities, and Units

Voltage, Current, and Resistance

Ohms Law, Energy, and Power

Series Circuits

Parallel Circuits

Series-Parallel Circuits

Magnetism and Electromagnetism

Capacitors

Rccircuits

Inductors

Rlcircuits

Rlccircuits and Resonance

Transformers

Time Response of Reactive Circuits

Filters