MCQs in Radio Engineering (Electronics and Communication Engineering) Test Paper
Choose the correct answer
1. Output power of 10 kW FM transmitter modulated with 1 Khz sinusoidal tone with deviation of + 75 kHz shall be
- 10 kW
- 15 kW
- 7.5 kW
2. Adaptive pre-emphasis in FM limiter is
- Independent of frequency.
- Dependent on frequency.
- Independent of level.
- Dependent on level.
3. The feeder used to connect the FM Transmitter to the antenna is
- Co-axial cable.
- 2-wire shielded cable.
- Twin flat cable.
- None of the above.
4. The maximum permissible frequency shift in mW transmitter is
- + 10 Hz
- + 12 Hz
- + 5 Hz
- None of the above.
5. Second harmonic trap in MW Transmitter is connected in
- Output of modulator
- Output of final power amplifier
- Input of final power amplifier
- Output of A.T.U.
6. The power supply is required for one of the following microphone
- Dynamic
- Cardioid
- Ribon
- Condenser
7. The polar diagram of a cardiod microphone is
- Omni-directional
- Bi-directional
- Heart-shaped
- None of the above.
8. Pre-emphasis employed in FM transmitter in AIR is
- 50 m Sec.
- 75 m Sec.
- 100 m Sec.
- None of the above.
9.-70 dBu output of microphone equals
- 245.08 mV
- 0.0775 mV
- 0.775 mV
- None of the above.
10. The voltage level for 0 dBm in 50 ohms equals
- 0.224 Volt
- 0.775 Volt
- 7.75 Volt
- None of the above.
Answers
1 (a) 2 (b) 3 (a) 4 (a) 5 (b)
6 (d) 7 (c) 8 (a) 9 (a) 10 (a).