This paper is an overview of the sources and nature of various transient over voltages and the problems that may result in a low voltage ac distribution system. Voltage transients may be repeatable transients or random impulses and they have got remarkable effects on semiconductors, electrochemical contacts, insulation etc. Switching parallel loads on the same branch of distribution system as well as lighting are responsible for these transient overvoltages. Low voltage ac mains system should be protected from these transient overvoltages. For ....etc

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1.Zero voltage regulation in a transformer occurs at :
(A)zero p.f. lead 
(B)unity p.f.
(C )leading p.f.
(D)lagging p.f.

2.A parallel plate capacitor has 15 p.F capacitance. If the linear dimensions of the plate are doubled and the distance between the plates are also doubled, then new value of capacitance would be :
(A)15uF
(B)30 uF
(C )60 uF
(D)7.5 u.F

3.Resistance of a 230 V 100 W bulb is R1 and that of a 230 V 75 W is R2. Then,
(A)R1= R2
(B)R1 > R2
(C )R1 < R2
(D)R1 - 2R2

4.The current in a series ....etc

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Electrical impedance tomography (EIT) is a medical imaging technique in which an image of the conductivity or permittivity of part of the body is inferred from surface electrical measurements. Typically, conducting electrodes are attached to the skin of the subject and small alternating currents are applied to some or all of the electrodes. The resulting electrical potentials are measured, and the process may be repeated for numerous different configurations of applied current.

Proposed applications include monitoring of lung function, dete ....etc

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ABSTRACT



Because of high requirements in power, efficiency, installation space and weight, the design of electrical machines for hybrid electrical vehicles is a particular challenge. This seminar describes a comparative study allowing the selection of the most appropriate electric-propulsion system for a parallel hybrid electric vehicle (HEV). This seminar is based on an exhaustive review of the state of the art and on an effective comparison of the performances of the four main electric propulsion systems, namely the d ....etc

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Axial-field electrical machines offer an alternative to the conventional machines. In the axial-field machine, the air gap flux is axial in direction and the active current carrying conductors are radially positioned. This paper presents the design characteristics, special features, manufacturing aspects and potential applications for axial-field electrical machines. The experimental from several prototypes, including d.c. machines, synchronous machines and single-phase machines are given. The special features of the axial-field machine, such a ....etc

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Economical Alternative, For CTS And PTS(46)
Artificial intelligence in power station
Written-Pole technology
Axial-Field Electrical Machines(47)
In-Memory Database
Input Output Completion Ports
Brushless Servomotor(48)
AC Cable Versus DC Cable Transmission for Offshore Wind Farms
Electromagnetic Compatibility
Contactless Energy Transfer System(49)
Imode: inception, presence and impact
Microwave Applications
Super Co ....etc

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Power System Contingencies (19)
HVAC system
Process Automation Techniques
Adaptive Piezoelectric energy harvesting circuit (20)
Lightning Protection Zones
Modern Surge Arresters
BiCMOS Technology (21)
Electric Utility Industry .
End-Use Energy Efficiency Potential
Lightning Protection Using LFA-M (22)
Aluminium Alloy Conductors
HalBach array
Surge current protection using superconductors (23)
Magnetic Levitation
....etc

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To begin with, the word tomography can be explained with reference to ?tomo? and
?graphy?; ?tomo? originates from the Greek word ?tomos? which means section or slice,
and ?graphy? refers to representation. Hence tomography refers to any method which
involves reconstruction of the internal structural information within an object mathematically from a series of projections.

The projection here is the visual information probed using an emanation which are physical processes involved. These include physical processes such as radiation, wa ....etc

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Nanocomputers



History

Since Feynam’s “There is Plenty of Room at the Bottom”, nanotechnology has become a hot topic.
With computers being an integral part in today’s society, nanocomputers are the easiest and most likely route in which computer development may continue.

Moore’s Law

According to Moore’s Law, the number of transistors that will fit on a silicon chip doubles every eighteen months.
Presently, microprocessors have more than forty million transistors; by 2010 they cou ....etc

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Smart Marketing
Market Micro structure
Corporate Governanace
Forensic Accounting
Financial Reporting
Corporate Disclosure Practices
Quality Control
Benchmarking
Chi Square Test
Kaizen
Six Sigma
Knowledge Management
Enterprise Resource Planning
User profiling
Artificial Neural Networks Based Power System Restoration(28)
Brushless Motors
Magnetic Launching
MOCT technology (29)
Trends in appliance Motors
Parasiti ....etc

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