WorksheetsQ1. Mixed Signals and Sensors
Total questions: 20
Worksheet time: 10mins
Which of the following is (are) power amplifiers?
Class A
Class B
Class C
All of the above
By how much does the output signal vary for a class AB power amplifier?
360°
180°
Between 180° and 360°
Less than 180°
Which type of power amplifier is biased for operation at less than 180º of the cycle?
Class A
Class B or AB
Class C
Class D
Which type of amplifier uses pulse (digital) signals in its operation?
Class A
Class B or AB
Class C
Class D
Which of the power amplifiers has the lowest overall efficiency?
Class A
Class B or AB
Class C
Class D
Which of the following describe(s) a power amplifier?
It can handle large power.
It can handle large current.
It does not provide much voltage gain.
All of the above
_______ amplifiers primarily provide sufficient power to an output load to drive a speaker from a few watts to tens of watts.
Small-signal
Power
Large-signal
None of the above
The main features of a large-signal amplifier is the circuit’s ________.
power efficiency
maximum power limitations
impedance matching to the output device
All of the above
Class AB operation is ________ operation.
similar to class A
similar to class B
similar to class C
None of the above
Which operation class is generally used in radio or communications?
A
B
C
D
Categorize the power efficiency of each class of amplifier, from worst to best.
A, B, AB, D
A, AB, D, B
A, AB, B, D
Any of the mentioned
What is the maximum efficiency of a class A circuit with a direct or series-fed load connection?
90%
78.5%
50%
25%
What is the ratio of the secondary voltage to the primary voltage with the turn ratio in the winding?
N2/N1
(N1/N2)2
(N1/N2)1/3
N1 × N2
The maximum efficiency of a transformer-coupled class A amplifier is _______
25%
50%
78.5%
63.6%
What is the maximum efficiency of a class B circuit?
90%
78.5%
50%
25%
Class B operation is provided when the dc bias leaves the transistor biased just off, the transistor turning on when the ac signal is applied.
True
False
Which of the following is (are) the disadvantage(s) of a class B complementary-symmetry circuit?
It needs two separate voltage sources.
There is crossover distortion in the output signal.
It does not provide exact switching of one transistor off and the other on at the zero-voltage condition.
All of the above
Which of the push-pull amplifiers is presently the most popular form of the class B power amplifier?
Quasi-complementary
Complementary-symmetry
Transformer-coupled
None of the above
nMOS and pMOS transistors can be used for class B.
True
False
Which of the following instruments displays the harmonics of a distorted signal?
Digital multimeter
Spectrum analyzer
Oscilloscope
Wave analyzer
