| 1. | In a radio transmitter, the frequency of the crystal oscillator will be stable for a long time if the quality factor of the crystal resonator is ? | |
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> 100
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> 500
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>1000
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> 20000
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Report Question| 2. | In an IF amplifier, the IF transformer is provided with tapping to ? | |
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Increase the voltage gain
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Increase the bandwidth of the resonance circuit
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Increase the impedance offered by the resonance circuit to the following cascaded amplifier
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Increase the quality factor of the resonance circuit
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| 3. | Standard AM broadcast stations usually use what type of transmitting antennas ? | |
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Log periodic
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Driven collinear array
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Marconi array
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Yagi - Uda
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| 4. | In the case of a 70-MHz if carrier for a transponder bandwidth of 36 MHz, energy 36 MHz between MHz ? | |
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34 and 106
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52 and 88
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106 and 142
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34 and 142
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| 5. | We wish to transmit a digital voice at 32 Kbps through a communication channel having bandwidth of 3000 Hz. The received signal to noise power ratio is 30 dB. State which of the following statement is true ? | |
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To transmit data error-free through this channel. Channel equalizer circuit should be used at the receiver
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To transmit data error-free through this channel, the voice signal should be compressed by 2
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To transmit data error-free through this channel, a channel code with coding gain of 3 dB should be used
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It is not possible to transmit data error-free through this channel
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| 6. | Standard AM broadcast stations usually use what type of transmitting antenna ? | |
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Log periodic
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Driven collinear array
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Marconi array
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Yagi - Uda
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| 7. | A communication channel disturbed by additive white Gaussian noise has a bandwidth of 4 kHz and SNR of 15. The highest transmission rate that such a channel can support (in k-bits/sec) is ? | |
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16
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1.6
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3.2
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60
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| 8. | The fidelity of a radio receiver relates to ? | |
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Reproduction of AF waves
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Detection of carrier waves
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Tuning of radio waves
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None of these
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| 9. | In amplifying systems the output impedance of mixer is ? | |
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Low
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High
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Moderate
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Very high
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| 10. | The IF amplifier in a supper heterodyne receiver is ? | |
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Single-stage single tuned amplifier
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Two stages of single tuned amplifier
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Double-tuned amplifier
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Class-C amplifier
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