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WorksheetsHam Radio Extra Questions Till 2020 Set E7G
Total questions: 24
Worksheet time: 24mins
Name
Class
Date
1.
E7G01 What is the typical output impedance of an integrated circuit op-amp?
a)
A. Very low
b)
B. Very high
c)
C. 100 ohms
d)
D. 1000 ohms
2.
E7G02 What is the effect of ringing in a filter?
a)
A. An echo caused by a long time delay
b)
B. A reduction in high frequency response
c)
C. Partial cancellation of the signal over a range of frequencies
d)
D. Undesired oscillations added to the desired signal
3.
E7G03 What is the typical input impedance of an integrated circuit op-amp?
a)
A. 100 ohms
b)
B. 1000 ohms
c)
C. Very low
d)
D. Very high
4.
E7G04 What is meant by the term op-amp input offset voltage?
a)
A. The output voltage of the op-amp minus its input voltage
b)
B. The difference between the output voltage of the op-amp and the input voltage required in the immediately following stage
c)
C. The differential input voltage needed to bring the open loop output voltage to zero
d)
D. The potential between the amplifier input terminals of the op-amp in an open loop condition
5.
E7G05 How can unwanted ringing and audio instability be prevented in a multi-section op-amp RC audio filter circuit?
a)
A. Restrict both gain and Q
b)
B. Restrict gain but increase Q
c)
C. Restrict Q but increase gain
d)
D. Increase both gain and Q
6.
E7G06 Which of the following is the most appropriate use of an op-amp active filter?
a)
A. As a high-pass filter used to block RFI at the input to receivers
b)
B. As a low-pass filter used between a transmitter and a transmission line
c)
C. For smoothing power supply output
d)
D. As an audio filter in a receiver
7.
E7G07 What magnitude of voltage gain can be expected from the circuit in Figure E7-4 when R1 is 10 ohms and RF is 470 ohms?
a)
A. 0.21
b)
B. 94
c)
C. 47
d)
D. 24
8.
E7G08 How does the gain of an ideal operational amplifier vary with frequency?
a)
A. It increases linearly with increasing frequency
b)
B. It decreases linearly with increasing frequency
c)
C. It decreases logarithmically with increasing frequency
d)
D. It does not vary with frequency
9.
E7G09 What will be the output voltage of the circuit shown in Figure E7-4 if R1 is 1000 ohms, RF is 10,000 ohms, and 0.23 volts DC is applied to the input?
a)
A. 0.23 volts
b)
B. 2.3 volts
c)
C. -0.23 volts
d)
D. -2.3 volts
10.
E7G10 What absolute voltage gain can be expected from the circuit in Figure E7-4 when R1 is 1800 ohms and RF is 68 kilohms?
a)
A. 1
b)
B. 0.03
c)
C. 38
d)
D. 76
11.
E7G11 What absolute voltage gain can be expected from the circuit in Figure E7-4 when R1 is 3300 ohms and RF is 47 kilohms?
a)
A. 28
b)
B. 14
c)
C. 7
d)
D. 0.07
12.
E7G12 What is an integrated circuit operational amplifier?
a)
A. A high-gain, direct-coupled differential amplifier with very high input impedance and very low output impedance
b)
B. A digital audio amplifier whose characteristics are determined by components external to the amplifier
c)
C. An amplifier used to increase the average output of frequency modulated amateur signals to the legal limit
d)
D. A RF amplifier used in the UHF and microwave regions
13.
E7G01 What is the typical output impedance of an integrated circuit op-amp?
a)
A. Very low
b)
B. Very high
c)
C. 100 ohms
d)
D. 1000 ohms
14.
E7G02 What is the effect of ringing in a filter?
a)
A. An echo caused by a long time delay
b)
B. A reduction in high frequency response
c)
C. Partial cancellation of the signal over a range of frequencies
d)
D. Undesired oscillations added to the desired signal
15.
E7G03 What is the typical input impedance of an integrated circuit op-amp?
a)
A. 100 ohms
b)
B. 1000 ohms
c)
C. Very low
d)
D. Very high
16.
E7G04 What is meant by the term op-amp input offset voltage?
a)
A. The output voltage of the op-amp minus its input voltage
b)
B. The difference between the output voltage of the op-amp and the input voltage required in the immediately following stage
c)
C. The differential input voltage needed to bring the open loop output voltage to zero
d)
D. The potential between the amplifier input terminals of the op-amp in an open loop condition
17.
E7G05 How can unwanted ringing and audio instability be prevented in a multi-section op-amp RC audio filter circuit?
a)
A. Restrict both gain and Q
b)
B. Restrict gain but increase Q
c)
C. Restrict Q but increase gain
d)
D. Increase both gain and Q
18.
E7G06 Which of the following is the most appropriate use of an op-amp active filter?
a)
A. As a high-pass filter used to block RFI at the input to receivers
b)
B. As a low-pass filter used between a transmitter and a transmission line
c)
C. For smoothing power supply output
d)
D. As an audio filter in a receiver
19.
E7G07 What magnitude of voltage gain can be expected from the circuit in Figure E7-4 when R1 is 10 ohms and RF is 470 ohms?
a)
A. 0.21
b)
B. 94
c)
C. 47
d)
D. 24
20.
E7G08 How does the gain of an ideal operational amplifier vary with frequency?
a)
A. It increases linearly with increasing frequency
b)
B. It decreases linearly with increasing frequency
c)
C. It decreases logarithmically with increasing frequency
d)
D. It does not vary with frequency
21.
E7G09 What will be the output voltage of the circuit shown in Figure E7-4 if R1 is 1000 ohms, RF is 10,000 ohms, and 0.23 volts DC is applied to the input?
a)
A. 0.23 volts
b)
B. 2.3 volts
c)
C. -0.23 volts
d)
D. -2.3 volts
22.
E7G10 What absolute voltage gain can be expected from the circuit in Figure E7-4 when R1 is 1800 ohms and RF is 68 kilohms?
a)
A. 1
b)
B. 0.03
c)
C. 38
d)
D. 76
23.
E7G11 What absolute voltage gain can be expected from the circuit in Figure E7-4 when R1 is 3300 ohms and RF is 47 kilohms?
a)
A. 28
b)
B. 14
c)
C. 7
d)
D. 0.07
24.
E7G12 What is an integrated circuit operational amplifier?
a)
A. A high-gain, direct-coupled differential amplifier with very high input impedance and very low output impedance
b)
B. A digital audio amplifier whose characteristics are determined by components external to the amplifier
c)
C. An amplifier used to increase the average output of frequency modulated amateur signals to the legal limit
d)
D. A RF amplifier used in the UHF and microwave regions
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