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Let X(e^jw) denote the DTFT of a real sequence x[n]. Define Y(e^jw)=1/2{X(e^jw/2)+X(-e^jw/2)} Determine the inverse DTFT y[n] of Y(e^jw).
Consider the discrete-time sinusoid given by x[n] = A cos(ω n+ φ), where x[n] may or may not be periodic. For it tobe periodic with a period of N, it must satisfy x[n] = x[n + N] forall integers n.
Which is the best alternative to buying a machine assuming an interest rate of 4% and a time span of 6 years. Compare using Present Values. A: Buy new machines for $25k. They earn $5k per year and their maintenance costs are $125 per year.
The signal x(t) = sin(2pi(100)t),was sampling with sampling period T=1/400 second, 1- obtain a discrete time signal x(n) 2-what is the maximum sampling period which allows perfect reconstruction
In an op amp circuit, how is it possible that the power delivered to the circuit by two voltage sources is smaller than the power absorved by a load such as a resistor. How can the resistor absorve more power
The population mean is a random variable.
A synchronous generator rated 1350 MVA at 0.9 pf, 22.5-kV, Xs=11.6% is connected to a power system through a 1500 MVA, 7.9% 24-kV/230-kV generator step up transformer. The power is generated into a 230-kV system.
Suppose a resistor whose value is equal to the motor resistance is connected across the motor terminals and the motor is spun at 200 RPMs. What will be the voltage measured across the motor terminals
a series parallel circuit with a 3V dc power source connected to 3 resistors. R1 and R2 are in series with the voltage source and R3 is in parallel with R2. It is given that 4amps is flowing through R1 and 2amps is flowing through R2.
The motor details are as follows: 1 hp, 10V, 2500 rpm, 78.5 % efficiency, Ra=.01 O, La=.002 H, Kb= .03819 V/rad/sec. The chopper is one quadrant, and the on-state voltage drop across the device is assumed to be 1V regardless of the current variati..
a) At what time t1/2 have half the atoms decayed b) How many atoms have decayed at t = 40 ns c) Draw a graph of Nexc as a function of time. Show in the graph the lifetime, 1t1/2, 2t1/2, 3t1/2 and 4t1/2.
design the logic circuit for starting an emergency diesel generator. For the generator to start, the generator must be disconnected from the bus, there must be sufficient starting air pressure, and the fuel tank must indicate there is oil.
Consider a random variable that obeys a uniform desist and varies from 2 to 5. a). Determine the mean and variance of the random variable. b). what is probability that the random variable is between 2 and 3
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