Q. In modulation, what does the term 'carrier signal' refer to?
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A.
The original message signal
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B.
The signal used to carry the information
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C.
The noise in the system
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D.
The output signal after modulation
Solution
The carrier signal is the signal used to carry the information in modulation processes.
Correct Answer:
B
— The signal used to carry the information
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Q. In semiconductor physics, what is the significance of the bandgap?
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A.
It determines the conductivity of the material
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B.
It defines the frequency of operation
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C.
It indicates the modulation depth
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D.
It affects the gain of the transistor
Solution
The bandgap determines the conductivity of the semiconductor material, influencing its electronic properties.
Correct Answer:
A
— It determines the conductivity of the material
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Q. What is a small-signal model used for in communication systems?
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A.
To analyze large signal behavior
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B.
To simplify the analysis of linear circuits
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C.
To design power amplifiers
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D.
To measure frequency response
Solution
Small-signal models simplify the analysis of linear circuits by approximating the behavior around a bias point.
Correct Answer:
B
— To simplify the analysis of linear circuits
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Q. What is the function of a mixer in communication systems?
-
A.
To amplify signals
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B.
To convert signals to different frequencies
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C.
To filter unwanted signals
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D.
To rectify signals
Solution
Mixers are used to convert signals from one frequency to another, essential in modulation and demodulation processes.
Correct Answer:
B
— To convert signals to different frequencies
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Q. What is the main advantage of using FETs in modulation circuits?
-
A.
Higher power handling
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B.
Lower noise levels
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C.
Higher gain
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D.
Better thermal stability
Solution
FETs generally have lower noise levels compared to BJTs, making them suitable for modulation.
Correct Answer:
B
— Lower noise levels
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Q. What is the primary function of a diode in communication systems?
-
A.
Amplification of signals
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B.
Rectification of signals
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C.
Modulation of signals
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D.
Filtering of signals
Solution
Diodes are primarily used for rectification, converting AC signals to DC.
Correct Answer:
B
— Rectification of signals
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Q. What is the primary role of a rectifier in communication systems?
-
A.
To amplify signals
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B.
To convert AC to DC
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C.
To modulate signals
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D.
To filter noise
Solution
Rectifiers convert alternating current (AC) signals into direct current (DC) for further processing.
Correct Answer:
B
— To convert AC to DC
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Q. What is the purpose of small-signal models in communication systems?
-
A.
To analyze large signal behavior
-
B.
To simplify the analysis of linear circuits
-
C.
To design power amplifiers
-
D.
To measure frequency response
Solution
Small-signal models simplify the analysis of linear circuits by allowing the use of linear approximations.
Correct Answer:
B
— To simplify the analysis of linear circuits
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Q. Which configuration of an OP-AMP is commonly used for modulation?
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A.
Inverting amplifier
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B.
Non-inverting amplifier
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C.
Differential amplifier
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D.
Voltage follower
Solution
The non-inverting amplifier configuration is often used for modulation due to its high input impedance.
Correct Answer:
B
— Non-inverting amplifier
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Q. Which type of modulation is most commonly used in analog communication systems?
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A.
Amplitude Modulation (AM)
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B.
Frequency Modulation (FM)
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C.
Phase Modulation (PM)
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D.
Pulse Width Modulation (PWM)
Solution
Amplitude Modulation (AM) is widely used in analog communication systems for broadcasting.
Correct Answer:
A
— Amplitude Modulation (AM)
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Q. Which type of modulation is most commonly used in digital communication systems?
-
A.
Amplitude Modulation (AM)
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B.
Frequency Modulation (FM)
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C.
Phase Shift Keying (PSK)
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D.
Pulse Width Modulation (PWM)
Solution
Phase Shift Keying (PSK) is widely used in digital communication systems for its robustness against noise.
Correct Answer:
C
— Phase Shift Keying (PSK)
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