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Introduction to Amplifiers


Quiz Questions

1.Amplitude is a term that describes the size of a signal.
True
False
2. SIGNAL is a general term used to refer to a.c.or d.c. of interest in a circuit; e.g., input signal and output signal.
True
False
3.What determines the class of operation of an amplifier?
Amount of time in which current flows in the output circuit
None
4.What are the four classes of operation of a transistor amplifier?
A, AB, B, C
A, B, C, D
A, AB,
5.Figure1-8 represents
Adding stages of amplification
Direct-coupled transistor amplifiers
6.In direct coupling the output of one stage is connected directly to the input of the following stage.
True
False
7.What is the most common form of coupling?
RC coupling
Transformer coupling
8.There are two types of feedback in amplifiers. They are
Positive Feedback \ Regenerative Feedback
Negative Feedback \ Degenerative Feedback
Both
9.What is one use for a splitter?
A phase splitter is used to provide the input signals to a push-pull amplifier.
Not the above
10.Figure 1-23 represents
Transistor audio amplifier
FET audio amplifier
11.What is the bandwidth of an amplifier?
Difference between the upper and lower frequency limits of an amplifier
Bandwidth of a transformer
12.What are the upper and lower frequency limits of an amplifier?
Half-power points of a frequency-response curve
Full-power points of a frequency-response curve
13.What is the purpose of R4?
A part of the low-frequency compensation network for Q1
A decoupling capacitor for the effects of R2
14.Figure 2-21 represents _______________.
Typical RF amplifier
Typical AM radio RF amplifier
None
15.A frequency response curve will enable to determine the bandwidth and the upper and lower frequency limits of an amplifier.
True
False
16.How many inputs and outputs are possible with a differential amplifier as in chapter3?
Two inputs, two outputs
One input, two outputs
17.Figure 3-8. represents ______________.
Single-input, differential-output differential amplifier
Single-input, single-output differential amplifier
18.Operational amplifiers are usually high-gain amplifiers with the amount of gain determined by feedback.
True
False
19.Figure 3-11 represents ____________.
Block diagram of an Op-amp
Schematics of an Op-amp
20.A magnetic amplifier uses a changing inductance to control the power delivered to a load.
True
False