Explain the procedure of stub matching in transmission lines.
Stub matching is a widely used impedance matching technique in transmission lines to ensure maximum power transfer and to minimize reflections caused by load mismatch. The basic idea of stub matching is to add a short section of transmission line, known as a stub, at a specific location along the main transmission line so that the combined _________ __________ __________ ______ ________ _______ ________ ___ __________ _________ _____ ____.
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Calculate the noise power and noise voltage generated by a 1MΩ resistor at 37°C over a 1 MHz bandwidth.
Explain the procedure of stub matching in transmission lines.
What approach is followed in practice for the choice of a propagation medium for any communication system ? Why is a linear medium of propagation preferred?
A dipole antenna of carries
peak current at
frequency. Calculate the radiation intensity in the side-on direction at a distance of
.
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.
उचित चित्र की सहायता से क्रमिक अपवर्तनांक बहु-विधा तंतु की संरचना समझाएं । यह मॉडल परिक्षेपण को कैसे कम कर देता है ?
Compare the four types of network topologies on the basis of their configuration, reliability, cost and ruggedness.