QUIZ NO.
3 ON ANALOG COMMUNICATION UNIT-3
STUDENT NAME STUDENT ROLL YEAR Date
NO.
1. What is the purpose of sampling in signal 6. What is the primary drawback of Delta
processing? Modulation (DM)?
A) To amplify the signal B) To digitize the signal A) High complexityB) Limited dynamic range
C) To filter out noise D) To modulate the signal C) High power consumptionD) High susceptibility to
Answer: noise
Answer:
2. Which modulation technique is characterized
by varying the amplitude of discrete pulses 7. What is the key consideration in Pulse Code
according to the amplitude of the analog signal? Modulation (PCM) to minimize the impact of
A) Pulse Code Modulation (PCM) noise?
B) Frequency Modulation (FM) A) Increasing the sampling rate
C) Amplitude Modulation (AM) B) Using adaptive quantization
D) Pulse Amplitude Modulation (PAM) C) Employing error detection codes
Answer: D) Using differential encoding
3. In Pulse Code Modulation (PCM), how is the Answer:
analog signal converted into a digital signal?
A) By varying the amplitude of pulses 8. In Time Division Multiplexing (TDM), how are
B) By varying the frequency of pulses multiple signals transmitted over a single channel?
C) By assigning binary codes to sample amplitudes A) By modulating the signals onto carrier frequencies
D) By adding noise to the signal B) By interleaving samples of different signals in
Answer: time slots
C) By converting analog signals to digital form
4. Which modulation technique quantizes the D) By using amplitude modulation techniques
difference between the current sample and the Answer:
previous sample?
A) Pulse Amplitude Modulation (PAM) 9. What is the function of a digital multiplexer?
B) Differential Pulse Code Modulation (DPCM) A) To combine multiple analog signals into a single
C) Delta Modulation (DM) digital signal
D) Pulse Code Modulation (PCM) B) To amplify digital signals
Answer: C) To convert digital signals to analog form
D) To select one of several digital input signals for
5 In Delta Modulation (DM), what is the major transmission over a single channel
advantage of using adaptive delta modulation? Answer:
A) Reduced quantization noise
B) Faster transmission rates 10. In Pulse Amplitude Modulation (PAM), what
C) Lower power consumption does the amplitude of the pulse represent?
D) Greater simplicity in implementation A) Phase of the signalB) Frequency of the signal
Answer: C) Digital informationD) Analog information
Answer:
11 Which of the following is true about noise in 16. What is the purpose of quantization in PCM?
PCM systems? A) To reduce the sampling rate
A) Noise is always eliminated completely through B) To convert analog signals to digital form
encoding. C) To select one of several digital input signals
B) Noise affects the accuracy of the signal D) To approximate analog signal values with discrete
reconstruction. values
C) Noise has no impact on PCM systems. Answer:
D) Noise only affects the transmission speed.
Answer: 17. Which modulation technique converts an
analog signal into a stream of binary numbers by
12. What is the primary function of a digital sampling the amplitude of the signal at uniform
multiplexer in a communication system? intervals?
A) To convert analog signals to digital form A) Pulse Amplitude Modulation (PAM)
B) To amplify digital signals B) Pulse Code Modulation (PCM)
C) To combine multiple digital signals into a single C) Frequency Modulation (FM)
digital signal D) Amplitude Modulation (AM)
D) To select one of several digital input signals for Answer:
transmission over a single channel
Answer 18. What is the primary disadvantage of Delta
Modulation (DM)?
13. Which technique is used to minimize the bit A) High complexity
rate required for PCM by exploiting the B) Limited dynamic range
redundancy in speech signals? C) High susceptibility to noise
A) Delta modulationB) Differential pulse code D) High power consumption
modulation Answer:
C) Adaptive delta modulation D) Companding
19. Which modulation technique is used in digital
14. Which modulation technique quantizes the audio and video broadcasting systems?
difference between the analog input and a linear A) Pulse Amplitude Modulation (PAM)
approximation of the previous output? B) Pulse Code Modulation (PCM)
A) Delta modulation C) Delta Modulation (DM)
B) Adaptive delta modulation D) Differential Pulse Code Modulation (DPCM)
C) Differential pulse code modulation Answer:
D) Pulse code modulation
Answer: 20. How does increasing the number of
quantization levels in PCM affect the quality of the
15. What is the primary advantage of time- reconstructed signal?
division multiplexing (TDM) over frequency- A) It improves the quality.
division multiplexing (FDM)? B) It degrades the quality.
A) TDM provides better signal quality. C) It has no effect on the quality.
B) TDM requires less bandwidth. D) It depends on the sampling rate.
C) TDM is less susceptible to noise. Answer:
D) TDM is easier to implement.
Answer:
Faculty
Mukul Kumar
