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A 20 MVA, 11 kV, 3-phase, delta-connected synchronous motor has a synchro nous impedance of 15 W/phase. Windage, friction and iron losses amount to 1200 kW.
(a) Find the value of the unity power factor current drawn by the motor at a shaft load of 15 MW. What is the excitation emf under this condition?
(b) If the excitation emf is adjusted to 15.5 kV (line) and the shaft load is adjusted so that the motor draws upf current, find the motor output (net).
The flat circular disk rotates about a vertical axis through O with a slowly increasing angular velocity ?. Prior to rotation, each of the 0.44-kg sliding blocks has the position x = 22 mm with no force in its attached spring.
A lottery winner got $350,000 that invested as follows: part of it in a money market account, part in municipal bonds, and part in a mutual fund. After one year, he recieved a total of $24,200 in simple intersest from the three investments.
BJT Amplifiers Sketch an emitter-follower circuit with R1 = R2 = 50kohm ; RE = 2kohm. The collector of the npn transistor is connected to VCC = 5V and the input signal has an internal resistance, RS = 0.5kohm
Industry standards suggest that 10% of new vehicles require warranty service within the 1st year. Jackson Chevy in Detroit, MI, sold 12 cars yesterday. a. What is the probability that none of these cars requires warranty service
Find the capacitor voltage in the network shown in Figure if the switch doses at t= 0. Assume zero initial conditions. Also find the time constant, rise time, and settling time for the capacitor voltage.
A bandlimited signal with maximum frequency of 3.3 kHz, what is the minimum sampling frequency to sample this signal If a sinusoidal signal of 7 kHz is sampled by this sampling frequency, what is the frequency of the alias.
Overflow occurs when a result is too large to be represented accurately given a word size. Underflow occurs when a result is too small to be represented correctly (for example, a negative result while doing unsigned arithmetic.).
Find the mathematical expressions for the voltage vC and current iC if the switch is thrown into position 2 at a time equal to five time constants of the charging circuit.
1-mH inductor carries a current: i(t)=50*t^2*exp(-2*t) inunit of mA. Determine the voltage, power, and energy of the inductor as a function of time.
Develop an AM generator by means of the module "formula interpreter" which implements the AM formula given on page 236 and with which the degree of modulation m, fLF and fcarrier can be set. Select ÛLF = 1 V
A 400 V, 3-phase star connected alternator supplies a delta-connected load, each phase of which has a resistance of 30 and inductive reactance 40. Calculate the current supplied by the alternator
Bode plots were introduced in my second circuit analysis class, but I really didn't think it was important because it looked like an outdated tool no longer in use.
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