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
PRACTICE IT NOW TO SHARPEN YOUR CONCEPT AND KNOWLEDGE
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.
A. A proportional 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.
B. Transmission of data transmission
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.
C. The data to be transmitted is slow changing and has a low bandwidth
4. Modem is an acronym of
- Modulation
- Demodulation
- Modulation and demodulation
- All the above.
C. Modulation and demodulation
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
C. 692 to 732 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
A. 7.69 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.
A. 1
8. In an A.M. system, the modulated output voltage has Emin = 15 V, the modulation index is :
- 2
- 1.5
- 1
- 0.5
D. 0.5
9. For an F.M wave represented by the voltage equation E = 8 sin (6× 108t + 5 sin 4× 104t) V The 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
B. 95.5 MHz, 6.37 kHz
10. For an F.M wave represented by the voltage equation E = 8 sin (6× 108t + 5 sin 4× 104t) V The modulation index and the maximum deviation are:
- 5, 31.85 kHz
- 40, 31.85 kHz
- 5, 95.5 MHz
- 5, 12.74 kHz
A. 5, 31.85 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
D. 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
A. VHF and UHF
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.
B. Are less affected by noise
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
B. 28 kHz to 36 kHZ, 40 kHz to 48 kHZ.
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
D. 45 Hz
