A-002-08: Operational amplifiers, properties and applications
A-002-08-01:
What is an operational amplifier (op-amp)?
A high-gain, direct-coupled differential amplifier whose characteristics are determined by components mounted externally
A high-gain, direct-coupled audio amplifier whose characteristics are determined by components mounted externally
An amplifier used to increase the average output of frequency modulated amateur signals to the legal limit
A program subroutine that calculates the gain of an RF amplifier
A-002-08-02:
What would be the characteristics of the ideal op-amp?
Infinite input impedance, zero output impedance, infinite gain, and flat frequency response
Zero input impedance, zero output impedance, infinite gain, and flat frequency response
Infinite input impedance, infinite output impedance, infinite gain and flat frequency response
Zero input impedance, infinite output impedance, infinite gain, and flat frequency response
A-002-08-03:
What determines the gain of a closed-loop op-amp circuit?
The external feedback network
The PNP collector load
The power supply voltage
The collector-to-base capacitance of the PNP stage
A-002-08-04:
What is meant by the term op-amp offset voltage?
The potential between the amplifier input terminals of the op-amp in a closed-loop condition
The difference between the output voltage of the op-amp and the input voltage required for the next stage
The potential between the amplifier input terminals of the op-amp in an open-loop condition
The output voltage of the op-amp minus its input voltage
A-002-08-05:
What is the input impedance of a theoretically ideal op-amp?
Very high
Very low
Exactly 100 ohms
Exactly 1000 ohms
A-002-08-06:
What is the output impedance of a theoretically ideal op-amp?
Very low
Very high
Exactly 100 ohms
Exactly 1000 ohms
A-002-08-07:
What are the advantages of using an op-amp instead of LC elements in an audio filter?
Op-amps exhibit gain rather than insertion loss
Op-amps are more rugged and can withstand more abuse than can LC elements
Op-amps are available in more styles and types than are LC elements
Op-amps are fixed at one frequency
A-002-08-08:
What are the principal uses of an op-amp RC active filter in amateur circuitry?
Op-amp circuits are used as audio filters for receivers
Op-amp circuits are used as low-pass filters at the output of transmitters
Op-amp circuits are used as filters for smoothing power supply output
Op-amp circuits are used as high-pass filters to block RFI at the input of receivers
A-002-08-09:
What is an inverting op-amp circuit?
An operational amplifier circuit connected such that the input and output signals are 180 degrees out of phase
An operational amplifier circuit connected such that the input and output signals are in phase
An operational amplifier circuit connected such that the input and output signals are 90 degrees out of phase
An operational amplifier circuit connected such that the input impedance is held to zero, while the output impedance is high
A-002-08-10:
What is a non-inverting op-amp circuit?
An operational amplifier circuit connected such that the input and output signals are in phase
An operational amplifier circuit connected such that the input and output signals are 90 degrees out of phase
An operational amplifier circuit connected such that the input impedance is held low, and the output impedance is high
An operational amplifier circuit connected such that the input and output signals are 180 degrees out of phase
A-002-08-11:
What term is most appropriate for a high gain, direct-coupled differential amplifier whose characteristics are determined by components mounted externally?
Operational amplifier
Difference amplifier
High gain audio amplifier
Summing amplifier
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