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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?
Explain the terms: valence band, conduction band, valence electrons, and energy gap with the help of suitable diagrams. Valence Electrons: The electrons in the outermost orbi
Explain the 16-bit registers DPTR and SP of 8051. DPTR: DPTR stands for data pointer. DPTR having of a high byte (DPH) and a low byte (DPL). Its function is to hold a 16-b
Common emitter configuration: even in common emitter configuration current relation is like is same like common bias configuration. For common emitter configuration output cha
Q. A toroid with a circular cross section is shown in Figure. It is made from cast steel with a relative permeability of 2500. The magnetic flux density in the core is 1.25 Tmeasur
Q. With a cross sectional view, explain the working of a depletion type MOSFET Draw a biasing amplifier circuit DEPLETION-TYPE MOSFET: Two types of FETs: JFETs and MOSFETs. MOS
y[n]=2z=1
Semiconductor Diode: the semi conductor diode is formed by simply bringing n and p tripe material together (constructed from same base ge and si), at the instant the two mater
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Q. What is a wave analyzer? Explain any one technique of wave analyzer giving its application also. OR Write short note on HETERODYNE Wave analyzer. OR Explai
in industry
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