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Electric Circuits
Calculate (a) the value of the resistor Rx, such that the total power dissipated in the circuit is 2.5KW, and (b) the current flowing in each of the four resistors . R1=15ohms, R2=10ohms, R3=38ohms and R4=Rx.
Electric Circuits
Calculate the power in a circuit where the same source of 100V produces 4A in a 25Ω resistance.
Electric Circuits
Divide 0001010001001001 (BCD) by 10012 and express the result in octal equivalent.
Electric Circuits
Calculate (a) the value of the resistor Rx, such that the total power dissipated in the circuit is 2.5KW, and (b) the current flowing in each of the four resistors . R1=15ohms, R2=10ohms, R3=38ohms and R4=Rx.
Note that R1 and R2 are connected parallel and R3 and Rx are also separately connected in parallel. The resistors are connected to 250 V power supply. (Draw the circuit diagram)
Note that R1 and R2 are connected parallel and R3 and Rx are also separately connected in parallel. The resistors are connected to 250 V power supply. (Draw the circuit diagram)
Electric Circuits
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.
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.
Electric Circuits
In case of a receiver explain the following terms with the help of graphs: (i) sensitivity, (ii) half power point, (iii) linearity and (iv) fidelity. What should be their ideal behaviour/value?
Electric Circuits
Why do we prefer repeating waveforms for characterizing any communication system?
Electric Circuits
Draw the circuit representing a practical transmission line in terms of lumped components. What are the values of R and G in case of ideal transmission line? Why?
Electric Circuits
A computer key board has 108 keys. Assuming equal probability of any key pressing calculate the information content, I, carried by each key. Prove that this information is more than the information carried by a key on the number pad of a touch tone telephone. [Hint: Touch phone has 16 keys on its pad]
Electric Circuits
Depict the digital signal 1001101110 in (i) unipolar RZ, (ii) bipolar NRZ, and (iii) Manchester code.
