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1. At a location in Europe, it is necessary to supply 300 kW of 60-Hz power. The only power sources available operate at 50 Hz. It is decided to generate the power by means of a motor-generator set consisting of a synchronous motor driving a synchronous generator. How many poles should each of the two machines have in order to convert 50-Hz power to 60-Hz power?
2. A 480-V 200-kVA 0.8-power-factor-lagging 60-Hz two-pole Y-connected synchronous generator has a synchronous reactance of 0.25 W and an armature resistance of 0.03 W. At 60 Hz, its friction and windage losses are 6 kW, and its core losses are 4 kW. The field circuit has a dc voltage of 200 V, and the maximum IF is 10 A. The resistance of the field circuit is adjustable over the range from 20 to 200 W. The OCC of this generator is shown in Figure P5-1.
(a) How much field current is required to make VT equal to 480 V when the generator is running at no load?
(b) What is the internal generated voltage of this machine at rated conditions?
(c) How much field current is required to make VT equal to 480 V when the generator is running at rated conditions?
(d) How much power and torque must the generator's prime mover be capable of supplying?
How to design the logic circuit for a room has three doors, with aswitch next to each door, and one over head light. A person shouldbe able to enter or exit from any door and turn the room light onor off by toggling the switch.
Design an 8-bit register with 2 control inputs s1 and s0, 8 data inputs I7..I0, and 8 data outputs Q7..Q0. s1s0=00 means maintain the present value, s1s0=01 means load, and s1s0=10 means clear. s1s0=11 means to swap
Design a sequential circuit with input x and output Z. The circuit outputs 1 whenever the input "1100" arrives. For example, the following sequence Z is generated as a result of the following input x
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1. materials are deep-seated in human culture. do you agree with this statement? why or why not? give examples of
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.
What is the maximum data rate possible for a standard telephone circuit with an SNR of 1023 and BW of 3 KHz using 8 bits per symbol
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Determine the minimun number of 20 Acircuits required to supply the general lighting load in a residence of 1750 sq ft. in terms of good design practice, what is the max of receptacles allowed on a dedicated small appliance branch circuit
A unit of power often used for electric motors is the horse power (hp), which equals 746W. A small electric car is equipped with a 40-hp electric motor. How much energy does the motor deliver in one hour
Careful measurements in a certain non-magnetic (µ = µ0) medium reveal that the penetration depth of a 100 MHz uniform plane wave is 4 meters and the wavelength is p / 6 meters.
given as E= 100 a -200 af +300 az V/m. Determine the incremental work required to move a 20µC charge a distance of 6µm: (a) in the direction of a ; (b) in the direction of af ; (c) in the direction of az ; (d) in the direction of E ; (e) in the di..
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