Canadian Advanced pool, section 2-08

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Subelement 2

Advanced Components and Circuits

Section 2-08

operational amplifiers, properties and applications

2-08-01

What is an operational amplifier (opamp)?

A.
A high-gain, direct-coupled audio amplifier whose characteristics are determined by components mounted externally
B.
An amplifier used to increase the average output of frequency modulated amateur signals to the legal limit
C.
A program subroutine that calculates the gain of an RF amplifier
Correct Answer
D.
A high-gain, direct-coupled differential amplifier whose characteristics are determined by components mounted externally

2-08-01

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2-08-02

What would be the characteristics of the ideal op-amp?

A.
Zero input impedance, zero output impedance, infinite gain, and flat frequency response
Correct Answer
B.
Infinite input impedance, zero output impedance, infinite gain, and flat frequency response
C.
Infinite input impedance, infinite output impedance, infinite gain and flat frequency response
D.
Zero input impedance, infinite output impedance, infinite gain, and flat frequency response

2-08-02

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2-08-03

What determines the gain of a closedloop op-amp circuit?

A.
The PNP collector load
B.
The power supply voltage
Correct Answer
C.
The external feedback network
D.
The collector-to-base capacitance of the PNP stage

2-08-03

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2-08-04

What is meant by the term op-amp offset voltage?

A.
The difference between the output voltage of the op-amp and the input voltage required for the next stage
Correct Answer
B.
The potential between the amplifier input terminals of the op-amp in a closed-loop condition
C.
The potential between the amplifier input terminals of the op-amp in an open-loop condition
D.
The output voltage of the op-amp minus its input voltage

2-08-04

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2-08-05

What is the input impedance of a theoretically ideal op-amp?

A.
Very low
B.
Exactly 100 ohms
C.
Exactly 1000 ohms
Correct Answer
D.
Very high

2-08-05

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2-08-06

What is the output impedance of a theoretically ideal op-amp?

A.
Very high
B.
Exactly 100 ohms
C.
Exactly 1000 ohms
Correct Answer
D.
Very low

2-08-06

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2-08-07

What are the advantages of using an opamp instead of LC elements in an audio filter?

A.
Op-amps are more rugged and can withstand more abuse than can LC elements
B.
Op-amps are available in more styles and types than are LC elements
C.
Op-amps are fixed at one frequency
Correct Answer
D.
Op-amps exhibit gain rather than insertion loss

2-08-07

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2-08-08

What are the principal uses of an op-amp RC active filter in amateur circuitry?

A.
Op-amp circuits are used as low-pass filters at the output of transmitters
Correct Answer
B.
Op-amp circuits are used as audio filters for receivers
C.
Op-amp circuits are used as filters for smoothing power supply output
D.
Op-amp circuits are used as high-pass filters to block RFI at the input of receivers

2-08-08

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2-08-09

What is an inverting op-amp circuit?

Correct Answer
A.
An operational amplifier circuit connected such that the input and output signals are 180 degrees out of phase
B.
An operational amplifier circuit connected such that the input and output signals are in phase
C.
An operational amplifier circuit connected such that the input and output signals are 90 degrees out of phase
D.
An operational amplifier circuit connected such that the input impedance is held to zero, while the output impedance is high

2-08-09

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2-08-10

What is a non-inverting op-amp circuit?

A.
An operational amplifier circuit connected such that the input and output signals are 90 degrees out of phase
Correct Answer
B.
An operational amplifier circuit connected such that the input and output signals are in phase
C.
An operational amplifier circuit connected such that the input impedance is held low, and the output impedance is high
D.
An operational amplifier circuit connected such that the input and output signals are 180 degrees out of phase

2-08-10

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2-08-11

What term is most appropriate for a high gain, direct-coupled differential amplifier whose characteristics are determined by components mounted externally?

A.
Difference amplifier
Correct Answer
B.
Operational amplifier
C.
High gain audio amplifier
D.
Summing amplifier

2-08-11

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