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A 480-V, 60Hz, 500-hp 0.85-PF-leading eight-pole delta-connected synchronous motor has a synchronous reactance of 0.6 ohms and neglible armature resistance. Ignore its friction, windage and core losses for the purposes of this problem. |Ea| = 480 V when Field Current = 4 A (Assume that |Ea| is directly proportional to the field current).
a.) What is the speed of this motor?
b.) If this motor is initially supplying 500 hp at 0.85 PF lagging, what are Ea and Ia?
c.) How much torque is this motor producing? What is the torque angle? How near is this value to the maximum possible induced torque of the motor for this field current setting?
d.) If field current is increased by 20 percent, what is the new magnitude of the armature current? What is the motor's new power factor
A microcontroller manufacturer, Agduino, offers a single product which is produced at two different plants. The first plant located in college station produces 2/3 of the microcontrollers. The remaining microcontrollers come from Austin.
The Hamming distance between two bit strings of the same length is the number of positions in which the strings have different bit values. For example, the Hamming distance between 1110 and 0101 is 3.
Low doped silicon is used in partide detectors, in order to obtain a wide depletio region. Consider a pn junction with p-side doping Na = 5 X 1012 cm-3 and n side doping Nd = 1017 cm ".
Determine the HV-side fuses needed to protect a 3x140kVA, 12470/208 YNyn0 distribution transformer bank. Show and explain step by step the procedure you employ to solve this question. Use the type K and type T fuse curves
Calculate the energy required to change the arrival time of a near earth object of mass 10,000 MT by a distance equal to the diameter of Earth using laser ablation. Assume an ejection velocity of the material at 10,000 m/sec.
when the line was open-circuited, the measurement yielded an input impedance equivalent to a capacitor with capacitance of 40 pF. Find Zo of line, the phase velocity, and the relative permittivity of the insulating material.
Design a 4 input, 1 output combinational circuit. the input represents a 4-bit number, N = X3X2X1X0, which ranges from 0 to 15. The output, PN is 1 when N represents a Prime Number,PN, otherwise PN is 0
A container with a plunger compresses one pound mole of an ideal gas from 1 atmospheres pressure to 10 atmospheres. Calculate the amount of work done if the process is considered to be polytropic.
A portion of the wave will reflect from the load and propagate back down the line to arrive at the input once again. Find the power that returns to the input and express this as a loss in decibels when compared to the original 10W input.
What value of emitter resistor would you choose, if: a) You have to amplify the signal of a microphone that has an internal resistance of 100K using a Common Emitter bias configuration b) you have to drive a load of 50 with an Emitter Follower cir..
For each of the following functions find the values of S & Wn (omega n) and characterize nature of response (overdamped,underdamped,critical damped,etc) a) G(s)= 225/ s^2 +30s+225 b) G(s)= 625/ s^2 +625
1. Calculate the total (composite) load power factor, true power, reactive power and apparent power. 2. Also calculate the full-load current and the amount of capacitive KVAR needed to bring the overall power factor to .95 lagging.
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