This Portion of Electrical and Electronic Instrumentation contains Data Transmission and Telemetry MCQs (Multiple Choice Questions and Answers) / Objective Type Questions and Answers.
This Section covers below lists of topics.
- Methods of data transmission
- General Telemetry System
- Land line Telemetry System
- Radio Frequency (R.F) Telemetry
- Modulation Methods
- Pulse Modulation
- Pulse Modulation Methods
- Pulse Amplitude Modulation (PAM) Telemetry
- Pulse Code Modulation (PCM) Telemetry
- Transmission Channels and media
- Radio Link
- Telemetry Services
- Bandwidth and noise Restrictions
1. In frequency multiplexing systems, if the subcarrier frequency deviations are proportional to the center frequency , the scheme is referred to having:
- A proportional bandwidth format
- A constant bandwidth format
- A variable bandwidth format
- A consistent bandwidth format.
2. Time division multiplexing requires
- Constant data transmission
- Transmission of data transmission
- Transmission of data at random
- Transmission of data of only one measurand.
3. Time division multiplexing is used when
- The data to be transmitted is slow changing
- The data to be transmitted has a small bandwidth
- The data to be transmitted is slow changing and has a low bandwidth
- The data to be transmitted is fast changing and has a high bandwidth.
4. Modem is an acronym of
- Modulation
- Demodulation
- Modulation and demodulation
- All the above.
5. The tuned circuit of the oscillator in a simple A.M. transmitter uses a 100 µH inductor and 0.5 nF capacitor. If the oscillator output is modulated by audio frequencies upto 20 kHz, what is the range occupied by side frequencies?
- 702 to 722 kHz
- 702 to 732 kHz
- 692 to 732 kHz
- 682 to 722 kHz
6. An A.M. broadcast radio transmitter radiates 10 kW when the modulation percentage is 60. What is the power of carrier?
- 7.69 kW
- 8.47 kW
- 9.17 kW
- 5 kW
7. In an amplitude modulated system, the total power radiated 600 W. the power of the carrier is 400 W. what is modulation index?
- 1
- 0.5
- 0.75
- None of the above.
8. In an A.M. system, the modulated output voltage has Emin = 15 V, the modulation index is :
- 2
- 1.5
- 1
- 0.5
9. For an F.M wave represented by the voltage equationE = 8 sin (6× 108t + 5 sin 4× 104t) VThe carrier and modulating frequencies are:
- 127.3 MHz, 9.5 kHz
- 95.5 MHz, 6.37 kHz
- 190 MHz, 6.37 kHz
- 95.5 MHz, 12.74 kHz
10. For an F.M wave represented by the voltage equationE = 8 sin (6× 108t + 5 sin 4× 104t) VThe modulation index and the maximum deviation are:
- 5, 31.85 kHz
- 40, 31.85 kHz
- 5, 95.5 MHz
- 5, 12.74 kHz
11. The F.M telemetry as compared with A.M telemetry requires a channel that is
- Equal to that of A.M telemetry
- Smaller than what is required for A.M telemetry
- 100 times of that required for A.M telemetry
- 10 times of that required for A.M telemetry
12. In F.M systems operate at
- VHF and UHF
- Only VHF
- Only MF
- MF and HF
13. F.M systems as compared to A.M systems
- Are equally affected by noise
- Are less affected by noise
- Are more affected by noise
- Are highly affected by noise sense they operate at VHF and UHF.
14. A typical telemetry carrier frequency 230 MHz may be used with a bandwidth of ±320kHz using A.M. a data with a bandwidth of 4 kHz has to be transmitted. Subcarrier having a frequency 32 kHz and 44 kHz are modulated. The frequency bands utilized are
- 28 kHz to 40 kHZ.
- 28 kHz to 36 kHZ, 40 kHz to 48 kHZ.
- 28 kHz to 48 kHZ
- 230 kHz ± 324kHz
15. Twenty –one data channels, with subcarrier center frequencies ranging from 400Hz to 165 kHz have been designed for telemetry use. All have a frequency deviation of ± 7.5%. if the index of modulation is 5, the intelligence bandwidth of channel 1 for a center frequency of 3000 Hz is____________Assume the frequency multiplexing has been used.
- 6 Hz
- 20 Hz
- 60 Hz
- 45 Hz