Question 1

-The circuit in Figure 19-4 is known as the ________ and it rolls off at a rate of ________.

Accepted Answer

A) Butterworth high-pass filter, -40 dB/decade 
B) Butterworth low-pass filter, -40 dB/decade 
C) Butterworth low-pass filter, -20 dB/decade 
D) Butterworth high-pass filter, -20 dB/decade 
A) Butterworth high-pass filter, -40 dB/decade 
B) Butterworth low-pass filter, -40 dB/decade 
C) Butterworth low-pass filter, -20 dB/decade 
D) Butterworth high-pass filter, -20 dB/decade A

Question 2

-If   in Figure 19-3, the fCO equals ________.

Accepted Answer

A) 65 Hz 
B) 650 Hz 
C) 26.5 kHz 
D) 2.65 kHz 
A) 65 Hz 
B) 650 Hz 
C) 26.5 kHz 
D) 2.65 kHz C

Question 3

In a Wein-bridge op-amp oscillator, the output is a repetitive:

Accepted Answer

A) square wave. 
B) sine wave. 
C) triangular wave. 
D) all of these. 
A) square wave. 
B) sine wave. 
C) triangular wave. 
D) all of these. B

Question 4

Hartley and Colpitts oscillators can use op-amps.

Accepted Answer

A) True 
 B)False

Question 5

-In Figure 19-3, what will change the circuit into a high-pass filter?

Accepted Answer

A) increasing the value of the resistor 
B) switching the positions of the resistor and capacitor 
C) decreasing the value of the capacitor 
D) placing the capacitor in the feedback loop 
A) increasing the value of the resistor 
B) switching the positions of the resistor and capacitor 
C) decreasing the value of the capacitor 
D) placing the capacitor in the feedback loop

Question 6

If all four input resistors to a summing amplifier are   , the feedback resistor is   and all four input voltages are -2 V, the output voltage equals ________.

Accepted Answer

A) 2 V 
B) 2.2 V 
C) 8 V 
D) 10 V 
A) 2 V 
B) 2.2 V 
C) 8 V 
D) 10 V

Question 7

The output of an op-amp differentiator depends on the values of ________ and ________.

Accepted Answer

A) CIN, CF 
B) RIN, RF 
C) RIN, CF 
D) CIN, RF 
A) CIN, CF 
B) RIN, RF 
C) RIN, CF 
D) CIN, RF

Question 8

In a voltage-controlled oscillator (VCO), the output signal frequency is dependent on:

Accepted Answer

A) the value of a resistor-capacitor combination. 
B) the value of a resistor. 
C) the value of an applied voltage. 
D) the value of a capacitor. 
A) the value of a resistor-capacitor combination. 
B) the value of a resistor. 
C) the value of an applied voltage. 
D) the value of a capacitor.

Question 9

A Wien-bridge oscillator produces an excellent quality square wave.

Accepted Answer

A) True 
 B)False

Question 10

-If 22 V in the pass-band is input to the circuit in Figure 19-4, what is the output voltage at a frequency that is 1 decade higher?

Accepted Answer

A) 31.1 V 
B) 22 V 
C) 7.75 V 
D) 15.5 V 
A) 31.1 V 
B) 22 V 
C) 7.75 V 
D) 15.5 V

Question 11

The terminals on a three-terminal regulator are input voltage, output voltage and ground.

Accepted Answer

A) True 
 B)False

Question 12

-If   equals ________.

Accepted Answer

A) 13 V 
B) -3 V 
C) 3 V 
D) -13 V 
A) 13 V 
B) -3 V 
C) 3 V 
D) -13 V

Question 13

-If the inputs are 8. , the output voltage equals ________.

Accepted Answer

A) 9.6 V 
B) -9.6 V 
C) 10.08 V 
D) 7.2 V 
A) 9.6 V 
B) -9.6 V 
C) 10.08 V 
D) 7.2 V

Question 14

In an inverting input op-amp, differentiator supplied with a ramp or triangular wave, the output is a:

Accepted Answer

A) opposite phase ramp. 
B) same phase square wave. 
C) sine wave. 
D) opposite phase square wave. 
A) opposite phase ramp. 
B) same phase square wave. 
C) sine wave. 
D) opposite phase square wave.

Question 15

An op-amp comparator can be used to determine when an input voltage crosses a certain
reference voltage.

Accepted Answer

A) True 
 B)False

Question 16

-If   in Figure 19-3, the fCO equals ________.

Accepted Answer

A) 41.4 kHz 
B) 25.7 Hz 
C) 257 Hz 
D) 414 kHz 
A) 41.4 kHz 
B) 25.7 Hz 
C) 257 Hz 
D) 414 kHz

Question 17

In a filter circuit, the terminology single pole means:

Accepted Answer

A) one fixed contact. 
B) one single RC circuit. 
C) one movable contact. 
D) two cascaded RC circuits. 
A) one fixed contact. 
B) one single RC circuit. 
C) one movable contact. 
D) two cascaded RC circuits.

Question 18

-If   equals ________.

Accepted Answer

A) -0.8 V 
B) 0.8 V 
C) 13 V 
D) -13 V 
A) -0.8 V 
B) 0.8 V 
C) 13 V 
D) -13 V

Question 19

-If the inputs are 1. , what is the output voltage?

Accepted Answer

A) 13 V 
B) -6.2 V 
C) 6.2 V 
D) -4.1 V 
A) 13 V 
B) -6.2 V 
C) 6.2 V 
D) -4.1 V

Question 20

-If   Figure 19-3, fCO equals ________.

Accepted Answer

A) 568 Mz 
B) 56.8 Hz 
C) 3.0 Hz 
D) 300 Hz 
A) 568 Mz 
B) 56.8 Hz 
C) 3.0 Hz 
D) 300 Hz

Exam 19: Circuit Theorems in Ac Analysis

-The circuit in Figure 19-4 is known as the ________ and it rolls off at a rate of ________.

-If in Figure 19-3, the fCO equals ________.

In a Wein-bridge op-amp oscillator, the output is a repetitive:

Hartley and Colpitts oscillators can use op-amps.

-In Figure 19-3, what will change the circuit into a high-pass filter?

If all four input resistors to a summing amplifier are , the feedback resistor is and all four input voltages are -2 V, the output voltage equals ________.

The output of an op-amp differentiator depends on the values of ________ and ________.

In a voltage-controlled oscillator (VCO), the output signal frequency is dependent on:

A Wien-bridge oscillator produces an excellent quality square wave.

-If 22 V in the pass-band is input to the circuit in Figure 19-4, what is the output voltage at a frequency that is 1 decade higher?

The terminals on a three-terminal regulator are input voltage, output voltage and ground.

-If equals ________.

-If the inputs are 8. , the output voltage equals ________.

In an inverting input op-amp, differentiator supplied with a ramp or triangular wave, the output is a:

An op-amp comparator can be used to determine when an input voltage crosses a certain reference voltage.

-If in Figure 19-3, the fCO equals ________.

In a filter circuit, the terminology single pole means:

-If equals ________.

-If the inputs are 1. , what is the output voltage?

-If Figure 19-3, fCO equals ________.

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

Introduction to Alternating Current and Voltage

Capacitors

Inductors

Transformers

RC Circuits

RL Circuits

RlC Circuits and Resonance

Passive Filters

Time Response of Reactive Circuits

Three-Phase Systems in Power Applications

Filters

-The circuit in Figure 19-4 is known as the and it rolls off at a rate of .

The output of an op-amp differentiator depends on the values of and .