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The function f(t)=3cos(500πt) + 5cos(800πt) issampled digitally at a sampling rate of 400 Hz, starting attime t = 0.00025 s.
(a)Calculate the frequencies that you would expect to see on a frequency spectrum of the sampled data.
(b)If you did Part (a) properly, one of your answers should be 0 Hz, which means that aliasing leads to an effective DC offsetin the perceived signal. Calculate this effective DC offset in volts.
Phase 'A' of a three-phasee 4.16 kV ungrounded system is solidly grounded. For this fault, calculate the magnitude of the positive, negative, and zero sequence voltages at the fault.
An LVDT Is used to measure the axial deformation a simple bar.The uncertainty in this measurement is ± 0.025mm. A steelbar is to be used to measure a force of 1100N with an uncertaintyof 1 percent.
Four point charges of 1 C are located at the corners of a square with a side a =1 m. Find the magnitude of the force experienced by each charge.
Convert the first-order Butterworth low-pass prototype, H(z) = 1 / s+1 to a digital IIR filter using impulse invariant method when sampling frequency is 1 Hz.
A cylindrical metal wire of radius r1 and conductivity of o1 has a core region of radius r2 replaced along the whole length with a metal conductivity of o2. Calculate the resistance of the wire, R, between the ends.
A unit for a telecommunications system is to be designed so as to have a minimum availability of 0.9994. The MTTR (mean time to repair) for the unit is estimated to be 24 hours.
Find the heat energy generated by this amplifier. Assuming the BJT power transistor has a maximum junction temperature of 155 0C, if the ambient temperature is 25 0C, find the maximum allowable thermal resistance from the junction to ambient.
A sequential circuit has one flip-flop, two inputs X and Y, and one output S. The circuit consists of a D flip-flop with S as its output and the logic implementing the function X xor Y xor S as the input to the flip-flop.
Design the base-emitter area of NPN BJT so that its transconductance gain is gm=2 A/V at VBE=0.70 V. The technological parameters are as folows: the emitter is heavily doped, the base doping is 5*1017cm-3,the base width is W=0.5μm
A resistor on a Wheatstone bridge is replaced with a strain gage which has a nominal resistance of 120 Ohms and a gage factor of 2.06. The remaining resistors on this quarter-bridge Wheatstone bridge circuit are 120 Ohm fixed resistors.
If there are 500 atoms in the sample and assuming that from any state all possible downward transitions are equally probably, what is the total number of photons that will be emitted when all atoms return to the ground state
How the cell potential has been affected in the NH3 or Na2S had been added to the 1M CuSO4 solution instead of the 0.001M CuSO4 solution of the cell? Explain.
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