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Electric Circuits
20 kHz audio signal is amplitude modulated over a 100 kHz carrier frequency. The peak amplitude of carrier wave is 10 V. If the modulation index is 0.8, find out the frequencies present in the modulated output. Also calculate the ratio of maximum and the minimum amplitude of the envelope of modulated signal
Electric Circuits
Explain the time division switching used in telephony.
Electric Circuits
Explain the special features of stereo receiver circuit as compared to normal FM receiver.
Electric Circuits
Explain the functions of blanking and synchronizing pulses in a television receiver. How are these functions accomplished by using a sync separator circuit?
Electric Circuits
Three identical resistors of 4 ohms are connected to give a combined resistance of 6 ohms. Which of the diagrams illustrates how this was done?
Electric Circuits
Calculate the rate at which energy is supplied by a 160 Volts battery to a circuit if the current in the circuit is 6 Amperes.
Electric Circuits
Calculate the force of attraction between a star of mass 20.00*10^30kg and the earth assuming the star is located 1.50*10^8km from the earth
Electric Circuits
17.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
17.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
In a lightning strike, a charge (q) of 18 C is transferred between a cloud and the ground in a time of 2.0x10^-2 at a potential difference of 1.5x10^6 volts. What is the average current produced by the strike?
