1. Which of the following statement is correct ?

The frequency of carrier signal is very high compare to that of modulating signal

The frequency of carrier signal and modulating signal are equal

The frequency of carrier signal is lower than that of modulating signal

The frequency of carrier signal depends on frequency of modulating signal

Answer: The frequency of carrier signal is very high compare to that of modulating signal

Explanation:


2. Which of the following statement is true ?

Bandwidth of FM signal is lower than AM signal

Bandwidth of FM signal is equal to AM signal

Bandwidth of FM signal can be less or more than AM signal

Bandwidth of FM signal is more than AM signal

Answer: Bandwidth of FM signal is more than AM signal

Explanation:


3. Theoretical bandwidth requirement for FM system is ?

Same as that of the modulating signal bandwidth

Twice of modulating signal bandwidth

infinite

Thrice as of modulating signal bandwidth

Answer: infinite

Explanation:


4. FM broadcast lies in ?

HF Band

VHF Band

UHF Band

SHF Band

Answer: VHF Band

Explanation:


5. The disadvantage of FM over AM is ?

High modulating power is required

High transmitter power is required

Large bandwidth is needed

Noise is high for high frequency signals

Answer: Large bandwidth is needed

Explanation:


6. Indicate which one of the following is NOT and advantage of FM over AM ?

Better noise immunity is provided

Lower bandwidth is required

The transmitted power is more useful

Less modulating power is required

Answer: Lower bandwidth is required

Explanation:


7. When a carrier is phase modulated, with an integrated modulating signal, the resultant is ?

Phase modulated signal

Frequency modulated signal

Amplitude modulated signal

QPSK modulated signal

Answer: Frequency modulated signal

Explanation:


8. Sampling theorem finds application in ?

Amplitude modulation

Frequency modulation

Pulse code modulation

None of these

Answer: Pulse code modulation

Explanation:


9. An FM signal at 10.7 MHz IF needs to be digitized for demodulation in a digital domain. If the bandwidth of this signal is 200 kHz, the maximum usable sampling frequency is ?

200 kHz

600 kHz

400 kHz

800 kHz

Answer: 400 kHz

Explanation:


10. A circuit is said to be free from phase distortion if its phase response shows ?

Quadrature variation with frequency

Independent of frequency

Linear variation with frequency

Proportional to frequency

Answer: Proportional to frequency

Explanation: