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A 100-hp 440-V 0.8-PF-leading D-connected synchronous motor has an armature resistance of 0.3 W and a synchronous reactance of 4.0 W. Its efficiency at full load is 96 percent.
(a) What is the input power to the motor at rated conditions?
(b) What is the line current of the motor at rated conditions? What is the phase current of the motor at rated conditions?
(c) What is the reactive power consumed by or supplied by the motor at rated conditions?
(d) What is the internal generated voltage EA of this motor at rated conditions?
(e) What are the stator copper losses in the motor at rated conditions?
(f) What is Pconv at rated conditions?
(g) If EA is decreased by 10 percent, how much reactive power will be consumed by or supplied by the motor?
write a program to compute the power loss in a transmission line with a resistance of .05ohms/mile. compute the power loss if 500kw of power is transmitted from a power generating station to cities at distances of 20, 30, 40, 50,...100 miles at 10..
Show the PS1 line before and after the frame, assuming the channel is idle before and after the frame.
Draw the shear and bending-moment diagrams for the beam and loading shown, and determine the maximum absolute value
A 50 kVA, 6360V/230V transformer is tested on open and short-circuit to obtain its efficiency. The results of the tests are as follows. Open circuit: primary voltage, 6360V; primary current, 1A; power input, 2 kW. Short circuit: voltage across pri..
If someone presses the 1 or First floor button, the elevator should go to the 1st floor, open the door and remain in this state for a small amount of time, then close the door. Assume the elevator takes one clock cycle to travel.
an adiabatic throttling process for R-134a takes saturated liquid at 800 kPa entering, and drops the pressure to 280 kPa (constant specific enthalpy). Determine the quality exiting and the specific entropy change for the throttling process.
a) By applying Kirchoff's voltage law to the output (DC) circuit loop determine the DC Load Line, i.e. an expression relating Id to Vds. Comment briefly on the significance on the result, with respect to the slope and x-axis intercept.
For best precision, he wants to condition the signal such that it utilizes the full range of the A/D converter. Calculate the required DC offset and gain of the signal conditioner such that the signal will utilize the full range of the A/D converte..
Apply Coulomb's law to obtain an expression for the electric field at any point P (r, 0) on the x-y plane. Show that your result reduces to the expression given by Eq. (4.33) as the length L is extended to infinity.
In a bridge rectifier the transformer is connected to 220V, 60Hz mains and the turns ratio of the step down transformer is 11:1. Assuming the diode to be ideal, find: i) Idc
A given cable has characteristic impedance Z0 = 100 Ohms. At a given position on the line, the voltage amplitude is 1 V. Draw a sketch (a snapshot at a fixed time) of the forward-traveling voltage and current waves on the line, showing their amplit..
If a resistance of 50 Ω is inserted in series with the shunt field, calculate the armature current required to maintain half full-load torque. Calculate also the speed of the motor when supplying this torque.
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