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A 240kW 500 Volt 1750rpm separately excited dc generator has an overall efficiency of 94%. The shunt field resistance is 60ohms, and the rated current is 5amps. The I^2R loss in the armature is 0.023pu. Calculate the armature current, total losses in the machine, and the I^2R losses in the armature. Help would be greatly appreciated as my calculations for Armature Current Ia is in my mind way too high, 480A. Then calculate the losses in the armature.
A synchronous motor exited by 5 kV source has a synchronous reactance of 5 ohm .The motor is running without any mechanical load(the output real power is zero). Ignore all losses and calculate thr equavelent field voltage Ef that delivers 3 M VAr ..
what is the perceived colour if you mix red ,green and blue dyes in equal proportion and why What about red and green frequiencies only
To maintain a freezer box at -40°C on a summer day when the ambient temperature is 27°C, heat is removed at the rate of 1.25 kW. What is the maximum possible coefficient of performance of the freezer
A simple voltmeter with a full-scale reading of 50(V) is required. Use a d'Arsonval movement with a rating of 20(mV) at 1 (mA). Calculate the value of the voltmeter resistor, Rv, required to achieve these design specifications.
Design a second-order band-pass filter for a system with sampling frequency of 18 kHz that is tuned for f=5kHZ The filter should not have any sample delay (the numerator and denominator orders are equal)
a) What is the velocity of the particle b) If this velocity is known to within 0.2% accuracy, what is fx of the position that particle? Assume that the mass of the particle is 2 x 10-26 kg.
a.) Write signals as the real part of the sum if rotating phasors. b) sum of the counter-rotating phasors c.) Plot the single sided amplitude and phase spectra for this signal d.) plot the double-sided amplitude and phase spectra for this signal.
The charge is release from rest and accelerate through a potential difference of 100000v. (a) Find the speed of the sphere after the acceleration. (b) if the sphere (which is already up to its max)is fired directly at a fixed (can't move) charge q..
A Si bar is 0.25 cm long and 500 ?m2 in cross-sectional area. It is grounded at x=0 and biased at +20V at x=0.25 cm. Find the resistance and the current at 300K (a) when the Si bar is doped with 2×1017 cm-3 arsenic
Suppose we measured a resistance of about 1.4 ? across a graphite stick, used calipers to measure the cross-section of the stick (7 mm by 5 mm) and measured the distance between the multimeter test leads (54 mm).
Write the assembly code to specify an array named src that holds values: 01, 23, 45, 67, 89, and an array of five variables named dst, then write the code to copy the values in array src to array dst.
A 100 MHz plane wave is incident from air onto a dielectric medium ( \(\epsilon=\epsilon _{o}\) ) at normal incidence. Find the below. a. \(\Gamma \) and SWR b. \(\lambda \) in air and in dielectric c. Percentage of power density that is reflected f..
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