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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.
A pair of synchronous machines, on the same shaft, may be used to generate power at 60 Hz from the given source of power at 50 Hz. Determine the minimum number of poles that the individual machines
The binary-coded-decimal (BCD) format uses 4 bits to represent 10 decimal digits. For example, 259 is represented as "0010 0101 1001" in BCD format. A BCD incrementor adds 1 to a number in BCD format. For example, after incrementing, "0010 0101 10..
a) If the excitation voltage E0 is equal to the terminla voltage ( 4kV ), what is the maximum real power which the motor can deliver without losing synchronism b) What is the rotor pole shift in electrical degrees, corresponding to the nominal loa..
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
if the energy strored in the fully charged battery is used to lift the battery with 100% efficiency, what height is attained. Assume that the acceleration due to gravity is 9.8 m/s^(2) and is constant with height.
(a) Design a circuit that provides an output voltage which indicates the amount of fuel remaining, so that 1 V=empty and 5 V=full. (b) Design a circuit to indicate the rate of fuel consumption by providing a voltage output calibrated to yeild 1V = 1..
A 345-kV, 3-phase transmission line delivers 100 MVA, 0.866 lagging, to a wye connected load. Calculate the following: a. The total real and reactive power delivered to the load. b. The real and reactive power per phase.
Will the electric field inside change (how much if yes)? Will the stored energy in the capacitor change (how much if yes)?
A 277/480V three phase wye system has the following load: M1- Induction Motor, 50hp, n=0.91, PF= 0.89 at full load. M2- Induction motor, 25hp, n=0.9, PF= 0.9 at full load. R- Heater Load, PF=1 M- A synchronous motor to drive a second 25hp load.
steam flows through a turbine one inlet and two exits with know condition at the steady state ( hints: h1=3231KJ/kg, h2=2812 KJ/kg , specific volume (v)= 0.0994 m^3/kg , at p= 30 bars,v=0.4045m^3/kg, at p=5 bars, no potential and kinetic energy ch..
Evaluate the size of the solar PV system and Sizing a Solar PV System - What is their monthly average energy use?
What is the system reliability for a light panel containing 12 light bulbs, and only requires 9 bulbs to be working for success (only 3 failures allowed). The reliability performance of the bulbs is based on the exponential reliability distributio..
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