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Two star-connected generators are connected in parallel and supply a balanced load of 1500 kVA at 11 kV line voltage and 0.8 lagging power factor. The synchronous reactances of the two machines respectively are: 35 Ω and 40 Ω. The primemover governors of the two machines are adjusted so as to equally share the power load. The phase current in one machine is 43 A, at a lagging power factor. Calculate:
(a) the phase current in the second machine,
(b) the induced emf of each machine, and
(c) the power factor at which each machine operates.
In an amplifier circuit, why do we need to bias the MOSFET atan operating point What would happen if the signal peak amplitudewas smaller than 1 V, the transistor had Vto=1 V and we biased the transistor at Vgsq=0
A lamp of 100 candela is placed 1 m below a plane mirror which reflects 90% of light falling on it. The lamp is hung 4 m above ground. Find the illumination.
Find the voltage v0 and current i0 of the diode circuit shown in the figure below. You may assume a diode cut-in voltage of vy = 0.7V - difference in forward-bias voltages between the two diodes is 0.3V. Determine the reverse-saturation current of t..
Discuss how new detectors that allow us to see more of the electromagnetic spectrum (outside of visible light) have opened up new astronomical knowledge. NOTE AGAIN: this answer should discuss electromagnetic radiation that is NOT visible light.
A synchronous motor is drawing 90 amps from 240V, 3 phase line at 0.8 pf leading with field current adjusted to 1.2 amps. The synchronous machine Xd is 1.3 ohms. Find a). The power angle delta
(a) The ideal delay system. y[n] = x[n-nd] (b) The accumulator system. y[n] = sum (xk) , k from -inf to n (c) Forward difference system. y[n] = x[n + 1]- x[n] (d) Backward difference system. y[n] = x[n]- x[n - 1]
A starting torque of 80 Nm is developed in an induction motor by an auto-transformer starter with a tapping of 30%. If the tapping of auto-transformer starter is 60% then the starting torque
A solar panel consists of four parallel columns of PV cells. Each column has 10PV cells in series. Each cell produces 2W at 0.5V. Compute the voltage and current of the panel.
For a modified 2-stage cascade in which one of the resistors is decreased to kR (k51), find a process to calculate what the frequency becomes. For what value of k does f y dB of the modified 2-stage 0.95 cascade have a value 2aR ?
Design a circuit that will take two clocks with different pulses as an input, determine within one second the faster clock and lights an led to denote the faster clock. The led should stay on until it is reset by a control signal.
Consider a plane wave normally incident on a half-space of copper. If f=1GHz, compute the propagation constant, intrinsic impedance, and skin depth for the conductor. Also compute the reflection and transmission coefficients
A 3-D cubic unit cell contains four atoms whose centers are positional halfway up along each of the vertical cell edges and one atom each centered in the middle of the top and bottom faces. Make a sketch of the unit cell.
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