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पर उत्पन्न रव शक्ति एवं रव वोल्टता परिकलित करें ।
Calculate the noise power and noise voltage generated by a 1MΩ resistor at 37°C over a 1 MHz bandwidth.
State with reasons whether the following statements are True or False.
i) Rise time of a pulse is the time required for the amplitude to reach from 0% to 100% of the peak amplitude value.
ii) Standing wave ratio of a matched transmission line is zero.
iii) Amplitude modulation index for dc modulating signal is 100%.
iv) Multipoint communication system in telephony is more efficient than point-to-point communication.
v) Though audio frequency range is 20 Hz to 20 kHz, the telephone uses only 4 kHz bandwidth per channel, still the communication is audible.
vi) In superheterodyne receiver the local oscillator always operates at a fixed frequency.
vii) Bandwidth of video amplifier of the monochrome receiver is narrower than that in the case of colour video amplifier.
viii) Polarization discrimination technique doubles the bandwidth of the channel.
ix) Token ring protocol suffers with the data collision problem.
x) The compact structure of OSI model makes data transfer efficient as compared to TCP/IP model.
A dipole antenna of carries
peak current at
frequency. Calculate the radiation intensity in the side-on direction at a distance of
.
नेटवर्क सुरक्षा क्या होती है? इसके प्रकार विस्तार से समझाएं ।
व्यवहार में किसी संचार तंत्र के लिये माध्यम का चयन किस प्रकार किया जाता है ? रेखीय माध्यम को वरीयता क्यों दी जाती है ?
मोबाइल टेलीफोनी में आधार स्टेशन तथा मोबाइल स्विचन केंद्र के कार्य विस्तार से बताएं।