Q. In a super heterodyne receiver, if the intermediate frequency is 10.7 MHz and the carrier frequency is 89.6 MHz, the image frequency is ?
  • (A) 78.9 MHz
  • (B) 100.3 MHz
  • (C) 111 MHz
  • (D) 121 MHz
💬 Discuss
✅ Correct Answer: (C) 111 MHz
Q. Which type of capacitor is used in radio receiver for tuning purpose ?
  • (A) Mica gang
  • (B) Trimmer
  • (C) Miniature PVC gang
  • (D) Ceramic Capacitor
💬 Discuss
✅ Correct Answer: (C) Miniature PVC gang
Q. A squelch circuit in a TV receiver is used to ?
  • (A) Cut off IF when AGC is maximum
  • (B) Cut off audio amplifier when carrier is absent
  • (C) Cut off IF when AGC is inoperative
  • (D) Cut off brightness circuit when AGC is inoperative
💬 Discuss
✅ Correct Answer: (B) Cut off audio amplifier when carrier is absent
Q. For direct reception of TV signals from a communication satellite the type of antenna required is ?
  • (A) Horn
  • (B) Parabolic
  • (C) Chicken mesh
  • (D) loop
💬 Discuss
✅ Correct Answer: (C) Chicken mesh
Q. Maximum value of signal to noise ratio of an 8- bit ADC with an input range of 10 V will be ?
  • (A) 50 dB
  • (B) 43.8 dB
  • (C) 48.9 dB
  • (D) 49.8 dB
💬 Discuss
✅ Correct Answer: (D) 49.8 dB
Q. Noise figure of an amplifier depends on ?
  • (A) Bandwidth
  • (B) Output power
  • (C) Power input
  • (D) None of these
💬 Discuss
✅ Correct Answer: (D) None of these
Q. The term "white noise" refers to the following ?
  • (A) A random signal with flat power spectral density
  • (B) A random signal generated by beat signal
  • (C) A random signal with long range correlation
  • (D) All of the above are true
💬 Discuss
✅ Correct Answer: (A) A random signal with flat power spectral density
Q. The purpose of a Cass grain feed in a parabolic reflector antenna is to ?
  • (A) Achieve higher antenna gain
  • (B) Reduce the antenna size
  • (C) Reduce the beam width
  • (D) Ease of locating the feed at convenient point
💬 Discuss
✅ Correct Answer: (D) Ease of locating the feed at convenient point
Q. In a super heterodyne receiver, rejection of the image signal can be achieved by using a ?
  • (A) Higher local oscillator frequency
  • (B) Crystal oscillator
  • (C) Narrow band pass filter
  • (D) Narrow band pass filter at RF stage
💬 Discuss
✅ Correct Answer: (D) Narrow band pass filter at RF stage
Q. For an ideal 3000 Hz channel, S/N ratio is ?
  • (A) 3
  • (B) 1.5
  • (C) 4
  • (D) 2
💬 Discuss
✅ Correct Answer: (A) 3

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