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- 1. Multiple Choice
In PCM the quantization noise depends on
sampling rate
signal strength
number of quantization levels
none of the above
- 2. Multiple Choice
Quantization noise occurs in
FSK
PCM
QPSK
None of above
- 3. Fill in the Blank
The modulation method that represents bits as different phase shifts of a carrier is known as
- 4. Fill in the Blank
The number of different phase shifts used in QPSK are
- 5. Multiple Choice
16QAM technique is based on .......... and ............parameters of carrier signal
amplitude
phase
frequency
- 6. Multiple Choice
In FSK the frequency of sinusoidal carrier is shifted between .......... discrete values, in response to value of digital signal
1
2
3
4
- 7. Fill in the Blank
In FSK demodulator, envelope detector are simple ............ which rectify and filter their inputs to generate a dc voltage proportional to ac input.
- 8. Multiple Choice
The baud rate and bit rate for these systems are same
ASK
BFSK
BPSK
QPSK
64QAM
- 9. Multiple Choice
Let us assume using QAM we want to transmit a symbol consisting of 4 bits . So how many different possible symbol can we have
4
8
16
32
64
- 10. Multiple Choice
32QAM technique is based on .......... and ............parameters of carrier signal
amplitude
frequency
phase
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