AC MACHINERY
FUNDAMENETALS
04/11/17
Electrical Machines
Aamir Hasan Khan
1
The Rotating Magnetic Field
If two magnetic fields are present in a machine, then a torque will be created
which will tend to line up the two magnetic fields. If one magnetic field
Chapter 1
Transmission Lines and S-Parameters
1.1 Review of Transmission Lines
In our study of microwave circuits, we will be extensively using our knowledge of transmission lines. We
therefore need to review a few concepts from transmission line theory.
REFLECTIONS AND STANDING WAVE RATIO
Page 1 of 5
REFLECTIONS AND STANDING WAVE
RATIO (SWR)
For a moment, let us consider an infinitely long transmission line whose characteristic impedance is Z0.
If we apply RF to the transmission line, current will flow d
Lecture 12
Group Velocity and Phase Velocity
Many modern ideas on wave propagation originated in the famous works of Lord
Raleigh, and the problems we intend to discuss are no exception to this rule. The
distinction between phase velocity and group veloci
VSWR, or Voltage Standing Wave Ratio.
When a transmission line (cable) is terminated by an impedance that does not match the characteristic
impedance of the transmission line, not all of the power is absorbed by the termination. Part of the power
is refle
SYNCHRONOUS
GENERATOR
E N G. C. K I T U R
Introduction
Alternating-current (ac) generators are commonly referred to as
synchronous generators or alternators. A synchronous machine,
whether it is a generator or a motor, operates at synchronous
speed, that
Group velocity
Roger Grimshaw
July 2, 2002
Abstract
A short and largely traditional review of the concept of group velocity, prepared for the forthcoming Encyclopedia of Nonlinear Science
Waves often propagate as a packet, or group, within which there
are
Lecture 16: Group and Phase Velocity
Up to now we have just talked about the speed (or velocity) v of a wave. Actually there are two
velocities: the Group Velocity vg and the Phase Velocity vp . They are given by the memorable formul:
vp =
k
vg =
d
dk
1.
Position Angle Scales for 1.25" Eyepieces
Print this Page on Cardboard: Print this PDF-File on a sheet of cardboard 1:1 without any
page scaling.
Select the Scale for Your Instrument: If you are using an astronomical telescope with an
even number of ref
Lecture 7: Transmission Lines
Outline
1.
2.
3.
4.
Ladder Network Approximation
Inductance
Superconducting Transmission Line
Comparison with normal transmission line
September 25, 2003
Massachusetts Institute of Technology
6.763 2003 Lecture 7
Transmission
Group velocity and phase velocity
Lecture notes (Feb, 2009) : M. S. Santhanam
IISER, Pune / PRL, Ahmedabad.
This notes is meant to be a supplement and not a substitute for standard text books.
1
Phase and group velocity of waves
To understand the differen
Derive the relationship between the group velocity and the
phase velocity v g = v +
c dn
and indicate in what conditions a
n 2 d
light pulse can travel through a medium of index of refraction n
faster than the speed of light in vacuum?
Defintion:
vg =
d
Application
Note
An Introduction to Digital and Vector
Modulation
The transmission of data or digitally encoded speech
has resulted in the adoption of a variety of methods to
transmit the information. This Technical Information
explains basic techniques u
Sampling Theory 101
Oliver Kreylos
[email protected]
Center for Image Processing and Integrated Computing (CIPIC)
Department of Computer Science
University of California, Davis
CIPIC Seminar 11/06/02 p.1
Outline
Things that typically go wrong
Mathema
453.701 Linear Systems, S.M. Tan, The University of Auckland
8-1
Chapter 8 Energy and Power, Random Signals and
Noise
8.1
Energy and Power in Deterministic Signals
Consider a deterministic signal f (t). If we think of f (t) as a voltage, the instantaneous
AMS 5
CORRELATION
Correlation
The correlation gives a measure of the linear association
between two variables. It is a coefficient that does not depend
on the units that are used to measure the data and is bounded
between -1 and 1. In this class we will c
294
IJCSNS International Journal of Computer Science and Network Security, VOL.9 No.6, June 2009
A Review on Multiplexing Schemes for MIMO Channel Sounding
M. Habib Ullah, A. Unggul Priantoro
International Islamic University Malaysia
estimation [3, 6]. Ac
CORRELATION
There is a close relationship between the salaries of Presbyterian
ministers in Massachusetts and the price of rum in Havana.
D. Huff, How to Lie with Statistics
The correlation coefficient is a statistical measure of the relationship between
Weiss and Seibel Scoliosis 2012, 7(Suppl 1):P20
http:/www.scoliosisjournal.com/content/7/S1/P20
POSTER PRESENTATION
Open Access
Autocorrection how to measure the skills
acquired during physical therapy sessions
HR Weiss*, S Seibel
From 8th International C
Classification of Smart Card Operating Systems
Reza Asgari, Reza Ebrahimi Atani
Department of Computer Engineering, Faculty of Engineering, University of Guilan
[email protected], [email protected]
ABSTRACT
Today, smart cards are widely used in
Chapter 19
Input/Output Organization
191 There are two main reasons for using an I/O controller. First, different I/O devices exhibit different
characteristics and, if these devices were connected directly, the CPU would have to understand
and respond app
Chapter 20
Interupts
201 Interrupts provide a mechanism similar to that of a procedure call. One of the main differences is
that interrupts can be initiated by both software and hardware. In contrast, procedures are purely
software-initiated. The fact tha
Chapter 9
Overview of Assembly Language
91 Assembler directives provide information to the assembler that is useful during the assembly process. These are not the processor instructions.
92 Both statements allocate two bytes of uninitialized contiguous st
CONTINUOUS ASSESSMENT TEST
ETI2409: MICROPROCESSORS
1. Draw a typical architecture of a dual-interface card and briefly explain what is meant by pulse
width modulation .
2. What is meant by little endian and big endian byte ordering schemes. (page 24).
In
mike
Signals communication II.
Communication Circuit
A communication system consist of:
Transmitter.
Receiver.
Channel
as shown a side:
Transmitter- takes the information to be communicated in electrical form and convert it into an
electronic signal co
2.
Given,
X Y XY ' X ' Y
Now,
X Y Z X Y Z ' X Y ' Z
X Y Z ' X Y ' Z
XY ' X ' Y Z ' X Y ' Z
XY ' X ' Y Z ' XY ' X ' Y ' Z
By DeMorgans theory,
XY ' X 'Y ' XY ' X 'Y X ' Y X Y ' X 'Y ' XY
Hence,
X Y Z XY ' X 'Y Z ' X 'Y ' XY Z
XY ' Z ' X ' YZ ' X ' Y
CHAPTER 3: PHASORS & POLARITY
HOMEWORK #4
Problem
Solution
In order to achieve the desired conditions such that the corresponding output phase voltages for
the two transformers, as stipulated in the problem statement, are in phase, the transformer bank 2
CHAPTER 3: PHASORS & POLARITY
HOMEWORK #3
Problem
Solution
Since the components are in parallel arrangement, the same voltage, VXY; both in phase and
magnitude, is detected across them thus set as the common origin and reference as shown on the
phasor dia