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a) What is the key difference between coherent and non-coherent demodulation?b) Explain the concept of differential encoding for BPSK modulation.
A consumer protection agency conducts opinion polls to determine the quality (excellent, good, fair, bad) of products imported. if the agency conducted a poll in wich 1000 randomly selected individuals were contacted..
The two input terminals of an op-amp are connected to two wires leading from the output terminals of a transducer, which carries a sinusoidal output signal of 20 mV amplitude and 500Hz frequency.
1-phase 2-winding transformer is rated 30 kVA, 360/90 V, 60 Hz. A source connected to the 360-V winding supplies an impedance load connected to the 120-V winding. The load absorbs 15 kVA at 0.8 p.f. lagging
A coaxial cable connects a 50W transmitter to an antenna with a feed impedance of 200W. The operating frequency is 900MHz and the cable has a velocity factor of 0.66. Determine the characteristic impedance and length of the cable.
An electric bass amp is advertised as being able to deliver 200 Watts toan 8 Ohm speaker and 300 Watts to an 4 Ohm speaker. If the amp is a voltage source with an internal resistance, what is the value of the internal resistance
The inductance of an air core coil is 0.08H, and the effective resistance is 4 ohms when a 60V, 50Hz source is connected across the coil. Find the current passing through the coil and the reading of a watt meter across the coil.
Impulse Responses of LTI systems can be physically found by inputting \(x[n] = \delta[n]\)to the system and measuring the output. Assume that during the process, we inadvertently input\(x[n] = \delta[n] + \delta[n-1]\)
1.2MW wind turbine has rotor diameter 64 m. Turbine operates in area with average wind veocity=7.5m/s with air density = 1.18kg / m^3. Turbine power coeff. including unit efficiency = 42.8 % Determine power output and the annual energy produced
a. Convert all the per unit values to a common kVA of 100 and transmission side voltage base of 2500V b. To maintain one per unit voltage at rated load, find the per unit generator voltage needed.
The signal x(t) = 2 - sin(4.5t - pi / 4) + 3 cos (24t + pi / 2) is input into a system with frequency response H(omega). Find the output signal y(t) if: H(omega) = rect(omega/80) H(omega) = 2 - 2rect(omega/8) H(omega) = sin c(omega/20)
Using counters and state machines, use one slide switch to either read the switches that would set the duty cycle (count up to value) or cause the PWM to be running. If the slide switch is a ‘0' then the design allows the user to set the PWM valu..
Implement switching function of 4 variables H(A,B,C,D)= AB'+BC+A'CD using a 4 to 1 Multiplexer and any number of 2 to 1 multiplexer. One can select any 2 variables (for example, AB or CD) as select inputs of one 4 to 1 multiplexer.
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