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- 1. Multiple Choice
Non linear digital modulation technique in which carrier frequency and phase is continuous is
FSK
BPSK
QPSK
ASK
- 2. Multiple Choice
Digital modulation technique in which phase changes between 0° and 180° is called as
QPSK
BPSK
ASK
BFSK
- 3. Multiple Choice
The filter used in reconstruction of original message signal from the modulated signal
Band stop filter
low pass filter
HPF
BPF
- 4. Multiple Choice
The modulation technique in which the FSK signal gently shifts from one frequency level to another is known as
Differential FSK
Continuous PSK
Differential PSK
Continuous FSK
- 5. Multiple Choice
For transmission from GSM mobile terminals, the modulation scheme used is
Gaussian Minimum Shift Keying
16-PSK
QAM
QPSK
- 6. Multiple Choice
For an BASK modulated signal with a bit rate of 5000 bps,the minimum bandwidth is
l000Hz
5000Hz
2000Hz
2500Hz
- 7. Multiple Choice
Which modulation technique is called as On-Off keying
PSK
BFSK
QPSK
ASK
- 8. Multiple Choice
The mod-2 addition in binary codes refers to
XOR
AND
OR
XNOR
- 9. Multiple Choice
Amplitude Shift Keying (ASK) is very rarely used in Modulators and Demodulators (Modems) because
It is highly susceptible to noise
It takes
care of amplitude only
It shifts
only between ON and OFF states
None of
the above
- 10. Multiple Choice
In which of the following the frequency of the carrier signal varies based on information in a digital signal?
ASK
PSK
FSK
QPSK
- 11. Multiple Choice
An Amplitude Shift Keying (ASK) modulated signal has a bit rate of 2000 bps, then what is the baud rate?
1000
2000
3000
4000
- 12. Multiple Choice
In which of the digital modulation technique amplitude of the RF carrier is varries in accordance with baseband digital input signal?
FSK
BPSK
QPSK
ASK
- 13. Multiple Choice
In which of the following digital modulation technique uses dibits encoding scheme?
QPSK
BPSK
ASK
FSK
- 14. Multiple Choice
What is the minimum bandwidth for 8-QAM digital modulation?
fb
fb/2
fb/3
fb/4
- 15. Multiple Choice
The other name of BPSK is ----
Amplitude
Reversal Keying
Phase
Reversal Keying
frequency Reversal Keying
Phase
Repeated Keying
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