Transformer Basics
An electrical device that transfers energy from one circuit to another purely by magnetic inductive coupling.

Review of transformer losses
No load Loss (Excitation Loss) includes the hysteresis loss and eddy current loss.
excitation loss: energy lost by reversing the magnetic field in the core by the alternating AC.
mechanical loss: bearing friction,brush friction and windage loss

Load Loss (Impedance Loss)
Stray loss: It includes distortion of air-gap flux and also due to the due to non uniform ....etc

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METAL FOAM
BY cloud2511

Metal foam is a cellular structure consisting of a solid metal, frequently aluminium, containing a large volume fraction of gas-filled pores. The pores can be sealed (closed-cell foam), or they can form an interconnected network (open-cell foam). The defining characteristic of metal foams is a very high porosity: typically 75-95% of the volume consists of void spaces. The strength of foamed metal possesses a power law relationship to its density; i.e., a 20% dense material is more than twice as strong as a 10% dense ....etc

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36/2014
Maximum : 100 marks
Time : 1 hour and 15 minutes

1.For cutting a solid brass rod the most suitable pitch of the hacksaw blade is :
(A)1.4mm
(B) 1 mm
(C )1.8 mm
(D) 0.8 mm

2.The correct proportion for servo cut ‘S' in water for preparing soluble oil is with a concentration of:
(A)20 %
(B)50 %
(C ) 0.5 %
(D)5 %

3.The helical angle of twist drill determines the : 
(A) Lip angle 
(B) Rake angle
(C ) Chew angle
(D) Cutting angle

4.The term surface finish refers to the :
(A) Heat treatment g ....etc

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METAL FOAM

PRESENTED BY :cloud2511


abstractor
A metal foam is a cellular structure consisting of a solid metal, For ex. aluminium, containing a large volume fraction of gas-filled pores.
The pores can be sealed (closed-cell foam), or they can form an interconnected network (open-cell foam).
The defining characteristic of metal foams is a very high porosity: typically 75-95% of the volume consists of void spaces.
The strength of foamed metal possesses a power law relationship to it ....etc

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Dusa Sindhoori
B.Tech
Sree Chaitanya College Of Engineering
LMD colony
Karimnagar

I want the abstract,ppt,documentation and details about the topic Future evolution of microprocessor from single core to multi core
please send these details to [email protected]
please send the details which i requested ....etc

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about foam concrete applications ppt in to the right box for getting free material and support from us/dedicated premium members.. ....etc

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hi i am Muhammad Uzair, i would like to get details on QUANTUM FOAM ppt.
i personally visited this site but did not find this article now i am living in Pakistan and i studied this article on wikipedia and now i need help on this.
kindly provide me ppt on this topic i shall be very thankful to you. ....etc

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1.Which one of the following is called as valence electron in an atom ?
(A)No. of electrons in inner orbit
(B)No. of electrons in N shell
(C )No. of electrons in outermost orbit
(D)No. of electrons in M shell

2.One mega ohm is equal to_____________ohm.
(A)1 x 10*
(B)1x106
(C )lxlO3
(D)1 x 10-3

3.Which factor docs not depend on resistance of tire conductor among the following factors ?
(A)Length
(B)Material
(C )Voltage
(D)Temperature

4.Which material has the negative temperature co - efficient among the ....etc

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94/2014
Maximum : 100 marks
Time : 1 hour and 15 minutes

1. According to Census 2011, the taluk in Kerala having the highest birth rate is :
(A) Thiruvalla
(B)Tirurangadi
(C ) Cherthala
(D)Adoor

2.India’s first spacecraft for Mars is named :
(A) Chandrayaan
(B)Agni
(C ) Indra
(D)Mangalyan

3.Srinagar is located on the banks of:
(A) Jhelum
(B)Beas
(C ) Tapti.
(D)Son

4.Indian Viceroy who abolished sati in 1829 :
(A) Lord Wellesley
(B)Lord Linlithgow
(C )Lord William Bentick
(D)Lord Macaulay

5 ....etc

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INTRODUCTION


Metal foam is a dispersion of gas bubbles in a metallic bulk material
These are extremely lightweight materials
It contains 50% or more holes
They have some very promising properties

Structure o f metal foam
In metal foams cells are divided into distinct cells. the boundaries of these materials are made of solid material, the interior are voids.


Light weight Al foam
The best quality metal foams presently available
It has a density of from 300 to 1,000 kg/m³, th ....etc

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