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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?
Define Gray Code - bcd to decimal conversion? The Gray Code is a variation on binary code in which only 1 bit is changed from the preceding number. The bit so as to changes is
The Electrical Circuit sign convention Notice that current leaves a source at its high potential (positive) terminal but enters a load at its high potential (positive) ter
Q. For a JKFFwith JK = 11, the output changes on every clock pulse. The change will be coincident with the clock pulse trailing edge and the flip-flop is said to toggle, when T = 1
What is the function of 8254 Programmable Interval Timer? 8253 or 8254 Timer Description and Initialization PTI that is programmable Interval Timer/Counter) 8253
Consider the circuit shown in Figure in the t -domain as well as in the s-domain. Formulate the s-domain nodal equations and use MATLAB to solve for V A (s) and V B (s).
What is a microcomputer? A computer that is designed using a microprocessor as its CPU is known as microcomputer
Applications of holography 1. Holography is used in the non-destructive tests by interferometic methods. In this method called double exposure holographic interferometry,
Q. An integrator as shown in Figure is to be designed to solve dy(t) / dt + 2000y (t) = 0 with y(0) = 5. If R i is chosen to be 10 k, find C f .
define the physical significance of damping coefficient
What is the difference between the unit step function u(n+4) and the time-scaled function u(2n+8)
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