Q1. which of the following is different from others
(A) PAM
(B) PPM
(C) PDM
(D) PCM
Answer: PCM
Explanation:
Q2. As compared to FM transmitters, AM transmitters are
(A) more effective
(B) less effective
(C) equally efficient
(D) more costly
Answer: Less effective
Explanation:
Q3. Fidelity in a communication receiver is provided by
(A) detector stage
(B) mixture stage
(C) audio stage
(D) none of these
Answer: audio stage
Explanation:
Q4. The bandwidth needed for telephone channel is
(A) 5 kHz
(B) 3 kHz
(C) 10 kHz
(D) 12 kHz
Answer: 3 kHz
Explanation:
Q5. Which modulation system is most noice resistant
(A) FM
(B) DSB-SC
(C) PCM
(D) PPM
Answer: PCM
Explanation:
Q6. Sky wave propagation is used for
(A) medium distance transmission of signals
(B) Long distance transmission of signal
(C) short distance transmission of signals
(D) mobile transmission
Answer: Long distance transmission of signal
Explanation:
Q7. The highest modulation frequency used in AM broadcasting is
(A) 2 kHz
(B) 25 kHz
(C) 5 kHz
(D) 15 kHz
Answer: 5 kHz
Explanation:
Q8. The doppler effect is used in
(A) CW RADAR
(B) MTI
(C) PULSED RADAR
(D) Both (a) and (b)
Answer: Both (a) and (b)
Explanation:
Q9. In high power AM transmitter,modulation is done at
(A) buffer stage
(B) RF power stage
(C) oscillator stage
(D) IF stage
Answer: oscillator stage
Explanation:
Q10. one-to-one communication involves__________ addressing
(A) multicast
(B) broadcast
(C) unicast
(D) none of the above
Answer: unicast
Explanation:
Q11. MAN stands for
(A) mass area network
(B) man area network
(C) main area network
(D) metropolitan area network
Answer: metropolitan area network
Explanation:
Q12. FM broadcast band lies in
(A) VHF band
(B) UHF band
(C) SHF band
(D) HF band
Answer: VHF band
Explanation:
Q13. the principal merit of PCM system is its
(A) lower bandwidth
(B) lower noise
(C) lower cost
(D) lower power requirment
Answer: lower noise
Explanation:
Q14. To demodulate PCM, it is first converted in to
(A) PWM
(B) PPM
(C) PAM
(D) PDM
Answer: PAM
Explanation:
Q15. which system is free from noise?
(A) AM
(B) both FM and AM
(C) FM
(D) none
Answer: FM
Explanation:
Q16. Ultrasonic waves are produced by
(A) pettiro effect
(B) Doppler effect
(C) Columb law
(D) piezoelectric effect
Answer: piezoelectric effect
Explanation:
Q17. pre- emphasis is used to boost up
(A) high modulation frequencies
(B) both low & high
(C) low modulation frequencies
(D) none of these
Answer: low modulation frequencies
Explanation:
Q18. a PLL can be used to demodulate
(A) PAM
(B) PCM
(C) AM
(D) FM
Answer: FM
Explanation:
Q19. What is the IM Frequency of Amplitude Modulation?
(A) 400 KHz
(B) 455 KHz
(C) 500 KHz
(D) all the above
Answer: 455 KHz
Explanation:
Q20. in fdm system used for telephone, which modulation scheme is adopted?
(A) dsb
(B) fm
(C) vsb
(D) ssb sc
Answer: ssb sc
Explanation:
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