Answer to Question #110650 in Electric Circuits for ROHIT SHARMA

Question

State with reasons whether the following statements are True or False.
i) Optical fibre is an ideal medium for microwave transmission.
ii) Adding redundant bit in a transmitted signal ensures error free communication.
iii) A transmission line with infinite VSWR is ideal for signal transmission.
iv) Bandwidth of frequency modulated (FM) signal is narrower than that of amplitude modulated (AM) signal.
v) Amplitude shift keying is modulation of digital carrier by analog signal.
vi) GSM is a spread spectrum technology.
vii) TRF receivers are preferred over super-heterodyne receivers in audio communication.
viii) Schottky diode can handle higher frequency signals than p-n junction diode.
ix) Assembly language programmes are portable.
x) Same web browser can be used to access Internet as well as Intranet network.

Answer 1

i) Optical fibre is an ideal medium for microwave transmission. True because optical fible provides lossless transmission of microwaves, low attenuation, it withstands electromagnetic interference and has higher bandwidth compared to customary mediums.

ii) Adding redundant bit in a transmitted signal ensures error free communication. True because error-free communication implies detecting and correcting errors. To do this, we ned excessive information, which is provided by the redundant bits.

iii) A transmission line with infinite VSWR is ideal for signal transmission. False because it creates echo.

iv) Bandwidth of frequency modulated (FM) signal is narrower than that of amplitude modulated (AM) signal. False because AM was developed to have access to more stations available in any frequency range.

v) Amplitude shift keying is modulation of digital carrier by analog signal. False because amplitude shift keying is amplitude modulation of analog carrier signal is modified to carry digital signal.

vi) GSM is a spread spectrum technology. False because GSM uses TDMA and FDMA. Spread-spectrum technologies do not work with TDMA and FDMA

vii) TRF receivers are preferred over super-heterodyne receivers in audio communication. False because a TRF receiver has very simple construction and cannot amplify a specific signal, it amplifies a raw signal and then removes the carries signal, while superheterodyne receiver amplifies the raw signal and mixes it with an internal signal, which among other benefits improves selectivity and sensitivity.

viii) Schottky diode can handle higher frequency signals than p-n junction diode. True since the Schottky diodes operate at higher frequencies.

ix) Assembly language programmes are portable. False because such programs are written for specific processors and can be run on that processor only. They use registry of that processor. Different processors have different registry.

x) Same web browser can be used to access Internet as well as Intranet network. True because a web browser is just a tool for accessing pages located at different IP addresses. Both internet and intranet use IPs.