Babbitt metal, also called white metal, is an alloy used to provide the bearing surface in a plain bearing. It was invented in 1839 by Isaac Babbitt in Taunton, Massachusetts, USA. The term is used today to describe a series of alloys used as a bearing metal. Babbit metal is characterized by its resistance to gall.

Common compositions for Babbitt alloys:
90% tin 10% copper
89% tin 7% antimony 4% copper
80% lead 15% antimony 5% tin

Originally used as a cast in place bulk bearing material, it is now more commonly used as a thin surface l ....etc

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Novel shape memory effect (SME) and pseudoelastic behavior are discovered in single-crystalline Au, Cu, and Ni nanowires with lateral dimensions of 1.5-10 nm. Under tensile loading and unloading, these wires can recover elongations of up to 50%, well beyond the recoverable strains of 5-8% typical for most bulk shape memory alloys (SMAs). Results of atomistic simulations and evidences from experiments show that this phenomenon only exists at the nanometer scale and is associated with a reversible crystallographic lattice reorientation driven byt ....etc

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Novel shape memory effect (SME) and pseudoelastic behavior are discovered in single-crystalline Au, Cu, and Ni nanowires with lateral dimensions of 1.5-10 nm. Under tensile loading and unloading, these wires can recover elongations of up to 50%, well beyond the recoverable strains of 5-8% typical for most bulk shape memory alloys (SMAs). Results of atomistic simulations and evidences from experiments show that this phenomenon only exists at the nanometer scale and is associated with a reversible crystallographic lattice reorientation driven byt ....etc

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202/2014
Maximum : 100 marks
Time : 1 hour and 15 minutes

1. The thickness of the SWG No : 10 is :
(A) 2.6 mm
(B)3.2 mm
(C ) 2 mm
(D)1.6 mm

2.Maximum SWG number is :
(A) 50
(B)1
(C ) 1/0
(D)7/0

3.Mass/unit area for 1 mm thick steel is :
(A) 8.65 Kg/m2
(B)7.73 Kg/m2
(C ) 5.3 Kg/m2
(D)6.66 Kg/m2

4.Unit of force in S.I system :
(A) Kg
(B)Kgf
(C ) N
(D)N-m

5.What is Young’s modulus of elasticity?
(A) force/area
(B)load/area
(C ) stress/strain- 
(D)strain/stress

6.Unit of stress in S.I ....etc

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Aluminium(Al) ,Copper(Cu) and Magnesium(Mg) alloys can be combined with Silicon carbide(SiC),alumina(Al2O3),boron carbide(B4C),graphite(Gr)and other particulate fiber or whiskers reinforcements to significantly increase stiffness or improve the thermophysical properties of components.The application arena for for metal matrix composites is continually expanding as the cost effectiveness mature.Using various properties of metal matrix composites,they can be widely applied in the following fields.
1.Space
2.Commercial
3.Marine
4. ....etc

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Aluminium(Al) ,Copper(Cu) and Magnesium(Mg) alloys can be combined with Silicon carbide(SiC),alumina(Al2O3),boron carbide(B4C),graphite(Gr)and other particulate fiber or whiskers reinforcements to significantly increase stiffness or improve the thermophysical properties of components.The application arena for for metal matrix composites is continually expanding as the cost effectiveness mature.Using various properties of metal matrix composites,they can be widely applied in the following fields. 1.Space 2.Commercial 3.Marine 4.Medical. Composit ....etc

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The aim of this study is to propose simple and reliable techniques to assess the condition of metal oxide arrester based on the dielectric response techniques. A number of modern electrical diagnostics for Metal Oxide Surge Arrester (MOSA) are discussed in this paper. The techniques included return voltage, decay voltage and polarisation/depolarisation current measurement. The single and multipulse current (8/20micros) was used to artificially degrade the MOSA. The before and after diagnostic ....etc

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Metal matrix composite

A metal matrix composite (MMC) is composite material with at least two constituent parts, one being a metal. The other material may be a different metal or another material, such as a ceramic or organic compound. When at least three materials are present, it is called a hybrid composite. An MMC is complementary to a cermet.Contents
1 Composition
1.1 Matrix
1.2 Reinforcement
2 Manufacturing and forming methods
3 Applications
4 See also
5 References
6 External links



Composition

MMCs are made by ....etc

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Babbitt metal,
also called white metal, is an alloy used to provide the bearing surface in a plain bearing. It was invented in 1839 by Isaac Babbitt in Taunton, Massachusetts, USA. The term is used today to describe a series of alloys used as a bearing metal. Babbit metal is characterized by its resistance to gall.

Common compositions for Babbitt alloys:

* 90% tin 10% copper
* 89% tin 7% antimony 4% copper
* 80% lead 15% antimony 5% tin

Originally used as a cast in place bulk ....etc

[:=Read Full Message Here=:]

202/2014
Maximum : 100 marks
Time : 1 hour and 15 minutes

1. The thickness of the SWG No : 10 is :
(A) 2.6 mm
(B)3.2 mm
(C ) 2 mm
(D)1.6 mm

2.Maximum SWG number is :
(A) 50
(B)1
(C ) 1/0
(D)7/0

3.Mass/unit area for 1 mm thick steel is :
(A) 8.65 Kg/m2
(B)7.73 Kg/m2
(C ) 5.3 Kg/m2
(D)6.66 Kg/m2

4.Unit of force in S.I system :
(A) Kg
(B)Kgf
(C ) N
(D)N-m

5.What is Young’s modulus of elasticity?
(A) force/area
(B)load/area
(C ) stress/strain- 
(D)strain/stress

6.Unit of stress in S.I ....etc

[:=Read Full Message Here=:]