Question 1

Figure 18-8
-Identify the filter circuit in Figure 18-8 above.

Accepted Answer

A)  Low Pass 
B)  Band Pass 
C)  High Pass 
D)  Band Stop 
A)  Low Pass 
B)  Band Pass 
C)  High Pass 
D)  Band Stop

Question 2

-A low-pass filter and a high-pass filter in parallel with each other, would form a _ filter.

Accepted Answer

A)  band-stop 
B)  band-pass 
C)  all-pass 
D)  both A and B 
E)  none of the above 
A)  band-stop 
B)  band-pass 
C)  all-pass 
D)  both A and B 
E)  none of the above

Question 3

Figure 18-5
-The filter in Figure 18-5 has a Roll-off of:

Accepted Answer

A)  -40 dB per decade 
B)  -3 dB per decade 
C)  -6 dB per decade 
D)  -20 dB per decade 
A)  -40 dB per decade 
B)  -3 dB per decade 
C)  -6 dB per decade 
D)  -20 dB per decade

Question 4

The phase shift of the circuit in Figure 18-1, at the critical frequency is:

Accepted Answer

A)  45° 
B)  90° 
C)  0° 
D)  60.254° 
A)  45° 
B)  90° 
C)  0° 
D)  60.254°

Question 5

The circuit in Figure 18-1 is:

Accepted Answer

A)  a low-pass filter 
B)  a band-stop filter 
C)  a high-pass filter 
D)  a band-pass filter 
A)  a low-pass filter 
B)  a band-stop filter 
C)  a high-pass filter 
D)  a band-pass filter

Question 6

At the cutoff frequency, the voltage gain is 63.6% of the maximum.

Accepted Answer

A) True 
 B)False

Question 7

What is the output voltage, in Figure 18-3 at a frequency of 20 kHz?

Accepted Answer

A)  5 V 
B)  1.21 V 
C)  0.5 V 
D)  4.77 V 
A)  5 V 
B)  1.21 V 
C)  0.5 V 
D)  4.77 V

Question 8

-Decibels are used to provide a _ between voltage levels.

Accepted Answer

A)  comparison 
B)  common level 
C)  value 
D)  reference 
A)  comparison 
B)  common level 
C)  value 
D)  reference

Question 9

What is the output voltage, in Figure 18-1 at a frequency of 50 kHz?

Accepted Answer

A)  3.17 V 
B)  1.76 V 
C)  4.22 V 
D)  3.45 V 
A)  3.17 V 
B)  1.76 V 
C)  4.22 V 
D)  3.45 V

Question 10

-The bandwidth of a resonant circuit is determined by two points on the curve known as .

Accepted Answer

A)  the half power points 
B)  fcutoff 
C)  Q Point 
D)  both A and B 
A)  the half power points 
B)  fcutoff 
C)  Q Point 
D)  both A and B

Question 11

Figure 18-1
   Figure 18-2
-Which of the two response curves in Figure 18-2 A or B) represents the response of the circuit in Figure 18-1?

Accepted Answer

A)  Curve A 
B)  Curve B 
A)  Curve A 
B)  Curve B

Question 12

What is the output voltage, in Figure 18-1 at a frequency of 10 kHz?

Accepted Answer

A)  4.23 V 
B)  5 V 
C)  4.77 V 
D)  1.50 V 
A)  4.23 V 
B)  5 V 
C)  4.77 V 
D)  1.50 V

Question 13

Figure 18-6
-Identify the filter circuit in Figure 18-6 above.

Accepted Answer

A)  Band Stop 
B)  Low Pass 
C)  Band Pass 
D)  High Pass 
A)  Band Stop 
B)  Low Pass 
C)  Band Pass 
D)  High Pass

Question 14

Figure 18-1
-The capacitive reactance in Figure 18-1 is equal to the resistance at the critical frequency.

Accepted Answer

A) True 
 B)False

Question 15

Figure 18-3
-The circuit in Figure 18-3 has a critical frequency of:

Accepted Answer

A)  318.3 kHz 
B)  13.18 kHz 
C)  5.0 kHz 
D)  50.0 kHz 
A)  318.3 kHz 
B)  13.18 kHz 
C)  5.0 kHz 
D)  50.0 kHz

Question 16

Figure 18-1
-Given a frequency of 440 Hz, one Decade higher would be a frequency of:

Accepted Answer

A)  4 kHz 
B)  220 Hz 
C)  880 Hz 
D)  4,400 Hz 
A)  4 kHz 
B)  220 Hz 
C)  880 Hz 
D)  4,400 Hz

Question 17

Figure 18-5
-The circuit in Figure 18-5 is:

Accepted Answer

A)  a low-pass filter 
B)  a high-pass filter 
C)  a band-pass filter 
D)  a notch filter 
A)  a low-pass filter 
B)  a high-pass filter 
C)  a band-pass filter 
D)  a notch filter

Question 18

The effectiveness of a filter in rejecting signals beyond cutoff frequency is a function of the filter roll-off rating.

Accepted Answer

A) True 
 B)False

Question 19

Figure 18-3
   Figure 18-4
-The frequency at which the output voltage of a filter is 70.7% of the input voltage is called the:

Accepted Answer

A)  half-power point 
B)  critical frequency 
C)  break frequency 
D)  all of the above 
A)  half-power point 
B)  critical frequency 
C)  break frequency 
D)  all of the above

Question 20

The phase shift of the circuit in Figure 18-3, at the critical frequency is:

Accepted Answer

A)  -90° 
B)  0° 
C)  60.254° 
D)  -45° 
A)  -90° 
B)  0° 
C)  60.254° 
D)  -45°

Exam 18: Passive Filters

Figure 18-8 -Identify the filter circuit in Figure 18-8 above.

-A low-pass filter and a high-pass filter in parallel with each other, would form a _ filter.

Figure 18-5 -The filter in Figure 18-5 has a Roll-off of:

The phase shift of the circuit in Figure 18-1, at the critical frequency is:

The circuit in Figure 18-1 is:

At the cutoff frequency, the voltage gain is 63.6% of the maximum.

What is the output voltage, in Figure 18-3 at a frequency of 20 kHz?

-Decibels are used to provide a _ between voltage levels.

What is the output voltage, in Figure 18-1 at a frequency of 50 kHz?

-The bandwidth of a resonant circuit is determined by two points on the curve known as .

Figure 18-1 Figure 18-2 -Which of the two response curves in Figure 18-2 A or B) represents the response of the circuit in Figure 18-1?

What is the output voltage, in Figure 18-1 at a frequency of 10 kHz?

Figure 18-6 -Identify the filter circuit in Figure 18-6 above.

Figure 18-1 -The capacitive reactance in Figure 18-1 is equal to the resistance at the critical frequency.

Figure 18-3 -The circuit in Figure 18-3 has a critical frequency of:

Figure 18-1 -Given a frequency of 440 Hz, one Decade higher would be a frequency of:

Figure 18-5 -The circuit in Figure 18-5 is:

The effectiveness of a filter in rejecting signals beyond cutoff frequency is a function of the filter roll-off rating.

Figure 18-3 Figure 18-4 -The frequency at which the output voltage of a filter is 70.7% of the input voltage is called the:

The phase shift of the circuit in Figure 18-3, at the critical frequency is:

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

Circuit Theorems in Ac Analysis

Time Response of Reactive Circuits

Three-Phase Systems in Power Applications

Filters