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A three-phase, wye-connected, four-pole, 400- V, 60-Hz, 15-hp synchronous motor has a synchronous reactance of 3 Ω per phase and negligible armature resistance. The data for its no-load magnetization curve follow:
(a) When the motor operates at full load at 0.8 leading power factor, determine the power angle and the field current. Neglect all losses.
(b) Compute the minimum line current for the motor operating at full load and the corresponding field current.
(c) When the motor runs with an excitation of 10 A while taking an armature current of 25 A, calculate the power developed and the power factor.
(d) If the excitation is adjusted such that the magnitudes of the excitation voltage and the terminal voltage are equal, and if the motor is taking 20 A, find the torque developed.
A silicon diode is forward-biased with V = 0.5 V at a temperature of 293 K. If the diode current is 10 mA, calculate the saturation current of the diode.
Assuming RS = 0 and the source voltage to vary between 120 and 75 V, for a load resistance of 1000 Ω, determine the maximum value of the regulator resistor R if it is desired to maintain the load voltage at 60 V. Also find the required power ratin..
Caps are arranged on equilateral-triangle centers staggered perpendicular to direction of liquid flow, and liquid depth above caps is less than 1 in.
By a two-way analysis of variance determine whether the variance between the reactors and between the temperatures is highly significant (0.01 probability level). Even though no replicates were made at any condition,
the rate of flow to an ammonia synthesis reactor contains 25 mole ltbrgtnitrogen and the balance hydrogen. the flow
question 1a identify the components of a fire triangleb explain the condition required for combustion process to be
A waste with a concentration of 0.1 gram per liter is to be introduced to a hazardous waste reactor that is to achieve 90% destruction. A reactant
The curie (Ci) is a commonly used unit for measuring nuclear radioactivity: 1 curie of radiation is equal to decay events per second (the number of decay events from 1 g of radium in 1 s).
Determine the fraction of load for which the efficiency is a maximum, and calculate the corresponding efficiencies for the power factors of unity, 0.8, and 0.6.
What are the advantages of external recruiting?
The scale factors used are 1 cm = 0.03 T and 1 cm = 200 At/m. Find the hysteresis loss in watts.
Address Search - Air Pollution and Prepare the paper on Air Pollution
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