Question 1

Figure 18-3
  Figure 18-4
-Which of the two response curves in Figure 18-4 A or B)  represents the response of the circuit in Figure 18-3?

Accepted Answer

A)   Curve A
B)   Curve BC) A) and B)
D) undefined

Question 2

The output voltage, in Figure 18-1 is how many dB down from the input voltage, at the critical frequency?

Accepted Answer

A)   -0.707 dB 
B)   -20 dB
C)   -3 dB
D)   0 dBE) A) and B)
F) B) and D)

Question 3

Which of the following equations is correct for calculating the critical or cut-off frequency for the circuit in Figure 18-5?

Accepted Answer

A)   Fc = 1/2n LR) 
B)   Fc = 1/[2n L/R) ]
C)   Fc = 1/[2n LR) ]
D)   Fc = 2nL/R) E) B) and D)
F) A) and D)

Question 4

-In a low-pass RC filter, having a cutoff frequency of 2 kHz, C = 80nF. Determine R.

Accepted Answer

A)   98.0 Ω
B)   44.7 Ω
C)   995 Ω
D)   22.7 ΩE) A) and B)
F) B) and C) C

Question 5

The filter in Figure 18-1 has a Roll-off of:

Accepted Answer

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

Question 6

The is defined as the difference between the high and low cut-off frequencies.

Accepted Answer

A)   Q frequency range
B)   bandwidth
C)   roll-off
D)   filter widthE) A) and D)
F) B) and C)

Question 7

The output voltage, in Figure 18-3 is how many dB down from the input voltage, at the critical frequency?

Accepted Answer

A)   -20 dB 
B)   -0.707 dB
C)   0 dB
D)   -3 dBE) All of the above
F) None of the above

Question 8

Figure 18-3
-The circuit in Figure 18-3 is:

Accepted Answer

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

Question 9

Figure 18-7
-Identify the filter circuit in Figure 18-7 above.

Accepted Answer

A)   Band Stop
B)   Low Pass
C)   High Pass
D)   Band PassE) A) and B)
F) A) and C)

Question 10

The critical frequency of the circuit in Figure 18-5 is:

Accepted Answer

A)   1.59 kHz
B)   135 Hz
C)   159 Hz
D)   60 HzE) A) and C)
F) A) and B)

Question 11

The term "attenuation" refers to a:

Accepted Answer

A)   phase shift
B)   loss or reduction of signal strength
C)   signal gain
D)   unity gainE) None of the above
F) All of the above

Question 12

Frequency response is a graph of voltage gain versus frequency.

Accepted Answer

A) True 
 B)False

Question 13

The circuit in Figure 18-1 has a critical frequency of:

Accepted Answer

A)   3.18 kHz
B)   31.8 kHz
C)   3.18 MHz
D)   318 kHzE) A) and C)
F) None of the above

Question 14

What is the output voltage, in Figure 18-3 at a frequency of 1.0 kHz?

Accepted Answer

A)   0.269 V
B)   4.90 V
C)   1.76 V
D)   3.45 VE) C) and D)
F) None of the above

Question 15

The range of low frequencies passed by a low-pass filter within a specified limit is called the stopband.

Accepted Answer

A) True 
 B)False  False

Question 16

The output voltage of the circuit in Figure 18-5, at the cut-off critical)  frequency is:

Accepted Answer

A)   7.07 V
B)   0.707 V
C)   4.9 V
D)   1.59 VE) A) and B)
F) A) and D)

Question 17

Figure 18-9
-Identify the filter circuit in Figure 18-9 above.

Accepted Answer

A)   High Pass
B)   Band Pass
C)   Band Stop
D)   Low PassE) A) and D)
F) None of the above

Question 18

Figure 18-3
-The filter in Figure 18-3 has a Roll-off of:

Accepted Answer

A)   -3 dB per decade
B)   -20 dB per decade
C)   -40 dB per decade
D)   -6 dB per decadeE) A) and D)
F) None of the above

Question 19

Figure 18-3
-The capacitive reactance in Figure 18-3 is equal to the resistance at the critical frequency.

Accepted Answer

A) True 
 B)False

Question 20

-A high-pass RC filter can be changed to a low-pass RC filter by _ .

Accepted Answer

A)   adding another capacitor
B)   reversing the position of the resistor and capacitor
C)   adding another resistor
D)   adding both another resistor and capacitorE) All of the above
F) B) and C) B

Exam 18: Passive Filters

Figure 18-3 Figure 18-4 -Which of the two response curves in Figure 18-4 A or B) represents the response of the circuit in Figure 18-3?

Correct AnswerverifiedShow Answer

The output voltage, in Figure 18-1 is how many dB down from the input voltage, at the critical frequency?

Correct AnswerverifiedShow Answer

Which of the following equations is correct for calculating the critical or cut-off frequency for the circuit in Figure 18-5?

Correct AnswerverifiedShow Answer

-In a low-pass RC filter, having a cutoff frequency of 2 kHz, C = 80nF. Determine R.

Correct AnswerverifiedC

The filter in Figure 18-1 has a Roll-off of:

Correct AnswerverifiedShow Answer

The is defined as the difference between the high and low cut-off frequencies.

Correct AnswerverifiedShow Answer

The output voltage, in Figure 18-3 is how many dB down from the input voltage, at the critical frequency?

Correct AnswerverifiedShow Answer

Figure 18-3 -The circuit in Figure 18-3 is:

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Figure 18-7 -Identify the filter circuit in Figure 18-7 above.

Correct AnswerverifiedShow Answer

The critical frequency of the circuit in Figure 18-5 is:

Correct AnswerverifiedShow Answer

The term "attenuation" refers to a:

Correct AnswerverifiedShow Answer

Frequency response is a graph of voltage gain versus frequency.

Correct AnswerverifiedShow Answer

The circuit in Figure 18-1 has a critical frequency of:

Correct AnswerverifiedShow Answer

What is the output voltage, in Figure 18-3 at a frequency of 1.0 kHz?

Correct AnswerverifiedShow Answer

The range of low frequencies passed by a low-pass filter within a specified limit is called the stopband.

Correct AnswerverifiedFalse

The output voltage of the circuit in Figure 18-5, at the cut-off critical) frequency is:

Correct AnswerverifiedShow Answer

Figure 18-9 -Identify the filter circuit in Figure 18-9 above.

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Figure 18-3 -The filter in Figure 18-3 has a Roll-off of:

Correct AnswerverifiedShow Answer

Figure 18-3 -The capacitive reactance in Figure 18-3 is equal to the resistance at the critical frequency.

Correct AnswerverifiedShow Answer

-A high-pass RC filter can be changed to a low-pass RC filter by _ .

Correct AnswerverifiedB

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C

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False

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B