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1.) A three phase, D0 HP, 1765 rpm, BA0 V induction motor operating at three quarter load has an efficiency of 91% and a power factor of 87%. Determine active power, apparent power, reactive power and line current.
2.) Determine the rated primary and secondary currents and the approximate short circuit currents for a three phase A3,000-B80 V, 250 kVA transformer with a D% impedance. What is the ohmic impedance on the secondary side of the transformer?
3.) A 240 V center-tap transformer serves the following loads:
a. 2 - A500 W at 240Vb. 1 - C200 W at 120 Vc. 1 - D000 W at 240 Vd. 4 - 1500 W at 120What are the two line currents and neutral current when balanced as closely as possible? What is the maximum neutral current?
4.) A three phase 480 V source supplies a B00 kW load and B00 kVAR capacitor at unity power factor. What is the power factor of the load without the capacitor?
Revenue Protection and Technology Interventions in Metering The power supply industry has reached an impasse where urgent steps are needed to improve the financial health of t
Q. What is Autotransformers? In contrast to a two-winding transformer, the autotransformer is a single-winding transformer having a tap brought out at an intermediate point. Th
#i have an error at in the Matlab power system model..thus i couldn''t run it...
Q. How do you modify the direction of rotation of a D.C. motor? Ans: The direction of rotation of DC motor will be changed either by changing the field winding connections o
Field-Effect Transistor: The field-effect transistor that is abbreviated as FET relies on an electric field to control the shape and therefore the conductivity of a channel of
You have to look up the data sheets for the LM317 (Not LT317), LT1006. V1 is a standard 9 volt battery, and the resistors are “through hole”. Label the test points in, V+, gnd, and
reading type of cro probe
Explain the Synchronous Compensators These are synchronous motors running without mechanical loads (or with load if required). Similar to the synchronous generators, they can a
A circular ring of magnetic material has a mean length of 1m and a cross sectional area of .001m^2.A sawcut of 5mm width is made in the ring . calculate the magnetizing current req
With the help of schematic diagram illustrate Gas Power Plant. Describe the effect of reheating, regeneration and inter cooling with the help of suitable T-S diagrams. Give the
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