Q1. The channel bandwidth of television broadcast is ?
(A) 4.25 MHz
(B) 5 MHz
(C) 7 MHz
(D) 10 MHz

Q2. The highest modulation frequency typically used in AM broadcast is ?
(A) 5 kHz
(B) 10 kHz
(C) 15 kHz
(D) 1 MHz

Q3. The most common modulation system used for telegraphy is
(A) PWM
(B) PSK
(C) FSK
(D) AM

Q4. The frequency of a signal is inversely proportional to
(A) amplitude
(B) period
(C) width
(D) none of the above

Q5. The modulation normally used with the digital data is:
(A) FM
(B) AM
(C) SSB
(D) QPSK

Q6. The Modulation System inherently is most Noise Resistant in
(A) SSB Suppressed carrier
(B) FM
(C) PPM
(D) PCM

Q7. FM Broadcast band lies in
(A) VHF
(B) UHF
(C) SHF
(D) HF

Q8. In AM transmission the Frequency, Which is not transmitted is
(A) Carrier Frequency
(B) Audio Frequency
(C) Upper Side Frequency
(D) Lower Side Frequency

Q9. In high power AM transmission, Modulation is done at
(A) Buffer Stage
(B) Oscillator Stage
(C) RF Stage
(D) IF Stage

Q10. The FM Signal with a Modulation index mf is passed through a Frequency Tripler. The Wave is the Out Put of the Tripler will have a modulation Index of
(A) Mf 9
(B) Mf 3
(C) Mf
(D) 3 Mf

Q11. The Hartely Law State that
(A) The Maximum Rate of Information transmission depends on the Depth of Modulation
(B) The Maximum Rate of Information Depends on the channel Bandwidth
(C) Only Binary Codes may be used
(D) Redundancy is Essential

Q12. VSB is an Abbreviation if vestigial Sideband, is derived by Filtering
(A) DSB
(B) AM
(C) Either (a) or (b)
(D) PM

Q13. The Most Common Modulation System Used for telegraphy is
(A) FSK
(B) PSK
(C) PCM
(D) Single tone Modulation

Q14. FSK stands for
(A) frequency shift keying
(B) fake shift keying
(C) frequency single keying
(D) frequency shift key

Q15. ASK stands for
(A) amplitude shift keying
(B) angle shift keying
(C) angular shift keying
(D) amplitude single keying

Q16. QAM stands for
(A) Quardrature amplitude modulation
(B) Quardrature amplitude multiplexing
(C) Quardrature amplitude modem
(D) Quick amplitude modulation

Q17. Noise figure is used as a figure of merit of
(A) modulator
(B) oscillator
(C) amplifier
(D) isolator

Q18. TDMA stands for
(A) Time Division Multiple Access
(B) Target Domain Modulation Antenna
(C) Transit Delay Manipulation aerial
(D) Transistorised Detector Muting Antenna

Q19. The frequency band used by most satellite is
(A) SHF
(B) UHF
(C) VHF
(D) EHF

Q20. A modulation system most noise immune is
(A) PAM
(B) FM
(C) AM
(D) PCM

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