Q. In the case of a 70-MHz if carrier for a transponder bandwidth of 36 MHz, energy 36 MHz between MHz ?
  • (A) 34 and 106
  • (B) 52 and 88
  • (C) 106 and 142
  • (D) 34 and 142
💬 Discuss
✅ Correct Answer: (B) 52 and 88
Q. We wish to transmit a digital voice at 32 Kbps through a communication channel having bandwidth of 3000 Hz. The received signal to noise power ratio is 30 dB. State which of the following statement is true ?
  • (A) To transmit data error-free through this channel. Channel equalizer circuit should be used at the receiver
  • (B) To transmit data error-free through this channel, the voice signal should be compressed by 2
  • (C) To transmit data error-free through this channel, a channel code with coding gain of 3 dB should be used
  • (D) It is not possible to transmit data error-free through this channel
💬 Discuss
✅ Correct Answer: (D) It is not possible to transmit data error-free through this channel
Q. Standard AM broadcast stations usually use what type of transmitting antenna ?
  • (A) Log periodic
  • (B) Driven collinear array
  • (C) Marconi array
  • (D) Yagi - Uda
💬 Discuss
✅ Correct Answer: (C) Marconi array
Q. A communication channel disturbed by additive white Gaussian noise has a bandwidth of 4 kHz and SNR of 15. The highest transmission rate that such a channel can support (in k-bits/sec) is ?
  • (A) 16
  • (B) 1.6
  • (C) 3.2
  • (D) 60
💬 Discuss
✅ Correct Answer: (A) 16
Q. The fidelity of a radio receiver relates to ?
  • (A) Reproduction of AF waves
  • (B) Detection of carrier waves
  • (C) Tuning of radio waves
  • (D) None of these
💬 Discuss
✅ Correct Answer: (A) Reproduction of AF waves
Q. In amplifying systems the output impedance of mixer is ?
  • (A) Low
  • (B) High
  • (C) Moderate
  • (D) Very high
💬 Discuss
✅ Correct Answer: (A) Low
Q. The IF amplifier in a supper heterodyne receiver is ?
  • (A) Single-stage single tuned amplifier
  • (B) Two stages of single tuned amplifier
  • (C) Double-tuned amplifier
  • (D) Class-C amplifier
💬 Discuss
✅ Correct Answer: (C) Double-tuned amplifier
Q. If the radiated power of AM transmitter is 10 KW, the power in the carrier for modulation index of 0.6 is nearly ?
  • (A) 8.24kW
  • (B) 8.47kW
  • (C) 9.26kW
  • (D) 9.6kW
💬 Discuss
✅ Correct Answer: (B) 8.47kW
Q. A communication channel is having a bandwidth of 300 Hz. The transmitted power is such that the received signal-to-noise ratio is 102. The maximum data rate that can be transmitted t error- free through the channel is ?
  • (A) 3 Kbps
  • (B) 30 Kbps
  • (C) 3 Mbps
  • (D) 300 Kbps
💬 Discuss
✅ Correct Answer: (B) 30 Kbps
Q. Use of pre-emphasis ?
  • (A) For amplify low frequency
  • (B) For amplify high frequency
  • (C) For amplify both high and low frequency
  • (D) For attenuate both high and low frequency
💬 Discuss
✅ Correct Answer: (B) For amplify high frequency

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