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Q. In an AM transmitter that transmits a total power of 1 kW, the unmodulated carrier power is 850 W. Compute the required value of (Si /Ni )AM at a receiver, if (S0/N0)AM = 2ηAM(Si /Ni )AM must be 103 for good performance.
Q. Wire-line and Fiber-optic channel? Wire-line channels are used extensively by the telephone network for voice, data, and video transmission. Twisted-pair wire lines (with
Q. A 10-kVA transformer is known to have an iron loss of 150 W and a full-load copper loss of 250 W. If the transformer has the following load cycle, compute its all-day efficiency
Q. What do you mean by Output Voltage Swing? Ideally this is equal to the difference between the two supply rail voltages, although in practice it is a few volts less.
Q. It is desired to have a sag or tilt of no more than 10% when a 50Hz square wave is impressed on an amplifier stage. The output circuit resistance is Rv=1K. What minimum value of
The increase in the current is building up the magnetic field surrounding the coil. Energy is stored in that field. Consider the energy supplied by the voltage source during the
Q. Determine the synchronous speed in revolutions per minute and the useful torque in newton- meters of a 200-hp, 60-Hz, six-pole synchronous motor operating at its rated full load
Q. The following data were obtained on a 25- kVA, 2400:240-V, 60-Hz, single-phase distribution transformer: • Open-circuit test with meters on LV side: 240 V, 3.2 A, 165 W •
Consider the network shown in Figure (a). (a) Find the voltage drops across the resistors and mark them with their polarities on the circuit diagram. (b) Check whether the KV
Q A high-pass filter circuit is shown in Figure. Using a PSpice program and PROBE, obtain the Bode magnitude plot for the transfer function ¯H(f) = ¯V out / ¯V in for frequency ra
Types of Power Diode According to their reverse recovery characteristics of power diodes it can be classified as follows: a. General purpose diodes b. Fas
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