advance-communication-system-mcqs - Set (5)

Correct Answer: Orange && Worng Answer: Red

1. A passive Satellite :

  • (A). Amplifies the signal
  • (B). Reflects the signal
  • (C). Absorbs the signal
  • (D). None of the above
    • View Answer

    Explanation: Not Avilable

    2. It the critical frequency of 30 MHz is departing at an angle of 60°, then MuF is :

  • (A). 15 MHz
  • (B). 30 MHz
  • (C). 60 MHz
  • (D). 10 MHz
    • View Answer

    Explanation: Not Avilable

    3. In a RADAR system which of the following is used for transmitter output tubes?

  • (A). Magnetron
  • (B). Klystron
  • (C). TWT
  • (D). Any of the above
    • View Answer

    Explanation: Not Avilable

    4. Cellular telephone services are also known as :

  • (A). AMPS
  • (B). MPS
  • (C). UPS
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    5. Free space intrinsic impedance is :

  • (A). 120πΩ
  • (B). 377Ω
  • (C). Both (a) and (b)
  • (D). None of these
    • View Answer

    Explanation: Not Avilable

    6. Which of the following expression is correct ?

  • (A). Vg.Vp=C2
  • (B). Vg.Vp=1
  • (C). Vg.Vp=C
  • (D). Vg.Vp=√2C
    • View Answer

    Explanation: Not Avilable

    7. The signal at the output of an AM modulator is given by eAM(t)=5.3[1+0.64Sin6280t] Sin106tV. The amplitude of carrier signal is :

  • (A). 5.3 V
  • (B). 3.39 V
  • (C). 6 V
  • (D). 10 V
    • View Answer

    Explanation: Not Avilable

    8. A carrier is simultaneously modulated by two Sine waves with modulation index 0.3 and 0.4 the total modulation index is :

  • (A). 0.1
  • (B). 0.5
  • (C). 0.3
  • (D). 0.4
    • View Answer

    Explanation: Not Avilable

    9. The distance of synchronous satellite from earth surface is :

  • (A). 3600 Km
  • (B). 50,000 Km
  • (C). 36,000 Km
  • (D). 40,000 Km
    • View Answer

    Explanation: Not Avilable

    10. A magnetron is a :

  • (A). High power oscillator
  • (B). Low power oscillator
  • (C). Low power amplifier
  • (D). High power amplifier
    • View Answer

    Explanation: Not Avilable

    11. A cavity can be considered as :

  • (A). B.P.F
  • (B). L.P.F
  • (C). H.P.F
  • (D). B.S.F
    • View Answer

    Explanation: Not Avilable

    12. In a RADAR System PRF stands for :

  • (A). Power return factor
  • (B). Pulse return factor
  • (C). Pulse repetation frequency
  • (D). Pulse response frequency
    • View Answer

    Explanation: Not Avilable

    13. Energy can be propagated in waveguide by :

  • (A). Varying voltage
  • (B). Varying current
  • (C). Varying electric and magnetic field
  • (D). None of the above
    • View Answer

    Explanation: Not Avilable

    14. Which of the following exibits negative resistance :

  • (A). Tunnel diode
  • (B). Gunn diode
  • (C). Varactor diode
  • (D). Both (a) and (b)
    • View Answer

    Explanation: Not Avilable

    15. Gauss’s laws of eletro statics is represented by the following expression :

  • (A). ∇.D=ρ
  • (B). ∇.B=O
  • (C). ∇x B= …B/…t
  • (D). ∇x H=Jε+(…D/…t)
    • View Answer

    Explanation: Not Avilable

    16. What is the frequency range of C-band?

  • (A). 8.5 to 12.5 GHz
  • (B). 3.4 to 6.425 GHz
  • (C). 12.95 to 14.95 GHz
  • (D). 27.5 to 31 GHz
    • View Answer

    Explanation: Not Avilable

    17. What is the reason for carrying multiple transponders in a satellite?

  • (A). More number of operating channel
  • (B). Better reception
  • (C). More gain
  • (D). Redundancy
    • View Answer

    Explanation: Not Avilable

    18. Which technique uses two different antennas to reduce traffic on the same frequency?

  • (A). Spatial isolation
  • (B). Frequency reuse
  • (C). Multiplexing
  • (D). Modulation
    • View Answer

    Explanation: Not Avilable

    19. What provides the sufficient drive to the final power amplifier?

  • (A). Intermediate-power amplifier
  • (B). Operational amplifier
  • (C). Power driver circuit
  • (D). Up converter
    • View Answer

    Explanation: Not Avilable

    20. The lowest frequency used in satellite communications is ______ GHz.

  • (A). 0.8
  • (B). 3
  • (C). 18
  • (D). 30
    • View Answer

    Explanation: Not Avilable

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