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Thespeed of a 20-hp, 300-V, 1800-rpm separately excited DC motor iscontrolled by a three-phase full converter drive. The field currentis also controlled by a three-phase full converter and is set tomaximum possible value. The AC input is a three-phase, Y-connected,208-V., 60 Hz supply. The armature resistance is 0.25 Ω, thefield resistance is 245 Ω, and the motor voltage constantKv is 1.2 V/A rad/s. The armature and field currents canbe assumed to be continuous and ripple free. The viscous frictionis negligible. Determine:
The delay angle of the armature converter if the motor supplies therated power at the rated speed.
The no-load speed if the delay angles are the same as in (a) andthe armature current at no load is 10% of the rated value.
The speed regulation.
Assuming the resistance versus temperature function to be linear, determine the expected resistance of the material at 0 degrees celcius( the freezing point of water) and at 100 degrees celcius (the boiling point of water)
A GaAs device is dopeed with a donor concentration of 3*10^15 cm^-3, For the device to operate properly, the intrinsic carrier cconcentration must remain less than 5 percent of the total electron concentration.
If the accoustic impedance of water is 1.49 and for steel is 42.1, what precentage of sound energy is reflected at a water-to-steel interface? 12.5%,86.8%,43.9% or 43.59%.
1) A 1.5H inductor has a constant current of 2.5A. a) find the energy that it holds b) what is its voltage c) what is its energy after its current drops to zero and stays zero What power is dissipated when a 20 olhm resistor is connected to it
Measuring the resistances of the resistors with lengths L1 = 10 µm and L2 = 30 µm, the following values are obtained: R1 = 365-ohm and R2 = 1085-ohm, respectively. If the width of the resistors is 5 µm, determine the sheet resistance and the contac..
What is the major difference between a bipolar and a unipolar device Which of the transistor currents is always the largest Which is always the smallest? Which two currents are relatively close in magnitude
a solid cylindrical conductor of raduis a and charge Q is coaxial with a cylindrical shell of negligible thickness,radius b,and charge -Q. FIND THE CAPACITANCE OF THIS CYLINDRICAL capacitor if its length is l.
Describe the how the Hall Effect it is used to measure whether a semiconductor material is n-type or p-type. Sketch a diagram and show the critical measurements.
An OFDM system with a passband bandwidth of 10 MHz and carrier frequency of 1 GHz is used in an outdoor environment with a maximum delay spread of 15 microseconds.
Identify the beginning point by an X and (q=0) label,and the ending point by an x with a (q= ∞) label. showthe q locus as a solid line, with arrow heads on it which indicatethe direction for the increasing values of positive q.
1-why placement of grounds is significant to obtaining accurate measurements when using instruments that can be grounded, such as scopes and 2) why should we never connect a DMM that is set up to measure current across a voltage supply
Given the surface charge density,ρs =2μ c/m2 , exsisting in region ρ=0.2m, z=0, find E at (a) PA(ρ=0, z=0.5); (b) PB(ρ=0, z=-0.5). Show that (c) the field along the z axis reduces to that of an infinite sheet charge at small values of z
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