Q1. The disadvantage of FM over AM is that
(A) High modulating power is required
(B) Lager bandwidth is required
(C) Noise is very high for high frequency signals
(D) None

Q2. Which system is less affected by noise?
(A) AM
(B) FM
(C) Both FM and AM
(D) None of these

Q3. Which of the following analog modulation scheme requires the minimum transmitted power and minimum channel bandwidth?
(A) VSB
(B) AM
(C) DSB-SC
(D) SSB

Q4. The filter required to obtain SSB from DSB signal is
(A) LPF
(B) HPF
(C) BPF
(D) Notch filter

Q5. The AM broadcast band is given by
(A) 5 MHz to 50 MHz
(B) 550KHz to 1650 KHz
(C) 10 KHz to 30 KHz
(D) None of these

Q6. Which of the folloing is not a purpose of modulation
(A) narrowbanding
(B) effective radiation
(C) increase in signal power
(D) multiplexing

Q7. which of the following instruction has more preference than others
(A) RST 7.5
(B) RST 6.5
(C) RST 5.5
(D) RST 4.5

Q8. serial data transfer takes place by how many mode.
(A) 1mode
(B) 2 mode
(C) 3 Mode
(D) 4 mode

Q9. The bandwidth required for base-band signals in telephony is ?
(A) 0.3 to 3.4 kHz
(B) 3.5 to 7.7 kHz
(C) upto 15 kHz
(D) upto 20 kHz

Q10. In which of the following frequency bands are the standard AM radio broadcast stations ?
(A) MF
(B) HF
(C) VHF
(D) UHF

Q11. Static noise has maximum effect on radio transmission during
(A) day time
(B) night time
(C) early morning
(D) afternoon

Q12. FM broadcast is done using ?
(A) medium waves
(B) short waves
(C) VHF and UHF waves
(D) microwaves

Q13. FM broadcast lies in which band ?
(A) HF
(B) SHF
(C) UHF
(D) VHF

Q14. Bandwidth of colour TV transmission is of the order of ?
(A) 100 kHz
(B) 1 MHz
(C) 6 MHz
(D) 10 MHz

Q15. Bandwidth of fiber optic communication is ?
(A) 10^4 - 10^8 Hz
(B) 10^12 - 10^16 Hz
(C) 10^16 - 10^20 Hz
(D) 10^8 - 10^12 Hz

Q16. Frequency band for mobile communication is ?
(A) 8 - 16 GHz
(B) 2 - 4 GHz
(C) 8 - 16 MHz
(D) 2 - 4 MHz

Q17. The Ultra high frequency ( UHF ) range extends from ?
(A) 3 - 30 MHz
(B) 30 - 300 MHz
(C) 300 - 3000 MHz
(D) 3000 - 30000 MHz

Q18. The very high frequency ( VHF ) range extends from ?
(A) 3 - 30 MHz
(B) 30 - 300 MHz
(C) 300 - 3000 MHz
(D) 3000 - 30000 MHz

Q19. The high frequency range extends from ?
(A) 300 - 3000 kHz
(B) 3 - 30 MHz
(C) 30 -300 MHz
(D) 300 - 3000 MHz

Q20. The bandwidth requirement of telephone channel is ?
(A) 3 kHz
(B) 5 kHz
(C) 15 kHz
(D) 25 kHz

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