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A certain 25-hp three-phase induction motor operates from a 440-V-rms (line-to-line) three-phase source and draws a line current of 35 A rms at a power factor of 83 percent lagging under rated full-load conditions. The full-load speed is 1750 rpm. Under no-load conditions, the speed is 1797 rpm, and the line current is 6.5A rms at a power factor of 30 percent lagging. Find the power loss and efficiency with full load, the input power with no load, and the speed regulation.
Desing a combinational circuit that accept a 3-bit numbuer and generates a 6-bit binary number output equal to the squre of the i/p number.
determine the current drawn from a 3 phase 220 V line by a 3 phase 15kW motor operating at half load, 85% efficiency and .8 pf lagging. Find the values of real and reactive power drawn from the line.
The building has 49 stories and there are up to 600 devices on each floor. To alleviate traffic on the fiber backbone, you want each floor to be its own subnet. Just list the first three and last two valid network ID's & address ranges
What is the lowest positive frequency at which the CTFT could be non-zero and what is the next-lowest positive frequency at which the CTFT could be non-zero?
plane polarized light is sent through two consecutive polarizers, the first having its plane of polarization in the same direction as the incident light and the second having its palne at 90 degrees to the original plane of polarization.
A point source of light is 12 cm below the surface of a large body of water (n=1.33 for water). What is the radius of the largest circle on the water surface through which the light can emerge
The wave function of a certain standing wave on a string fixed at both ends is y(x,t) = 0.30 sin(0.0025x)cos(300t) where y and x are in centimetres and t is in seconds. If the string is vibrating in its fifth harmonic, how long is it
Calculate the inductive reactance per meter of a single-phase, 50-Hz, two-wire transmission line. Assume each conductor's radius is 6cm and the distance between the two conductors is 3m.
The command in AutoCAD can be a time-saver, particularly when you're working in an application where you want to move a door or windows within walls on a drawing and don't want to redraw the walls.
Design a network realization of the transfer function below. Show the location of Ii and where the outputVo is taken. Also label all of the network element values. Vo / Ii = H s /(s+2)(s+4)
an office with several work stations has an effective area of 527 sqft (49 meters). it has decorative incandescent lighting. The lamps are 40 watt yielding an out put of 18 lm/W. An illumination of 645 lux is required for the work stations.
Two lenses of focal length f1 and f2, made from the same glass, are spaced by distance L. The effective focal length of the pair is related to refractive index n by f^(-1) = (n-1)a + (n-1)b - L((n-1)^2)ab
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