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1. In submerged arc welding, an arc is produced between a





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MCQ->In submerged arc welding, an arc is produced between a....
MCQ->The simplest method of welding two pieces of metal together is known as pressure welding.The ends of a metal are heated to a white heat-for iron,the welding temperature should be about 1300C-in a flame.At this temperature the metal becomes plastic.The ends are pressed or hammered together,and the joint is smoothed off.Care must be taken to ensure that surfaces are thoroughly clean first,for dirt will weaken the weld.Moreover,the heating of iron or steel to a high temperature cause oxidation,and a film of oxide is added to the heated surfaces.For this reason,flux is applied to the heated metal.At welding heat,flux melts and the oxide particles are dissolved in it together with any other impurities which may be present.The metal surfaces are pressed together,and the flux is squeezed out from the center of the weld.A number of different types of weld may be used,but for fairly thick bars of metals,a vee-shaped belt should be normally employed.It is rather stronger than ordinary butt weld. The simplest way of welding two pieces of metal together is....
MCQ->Consider the following statements relating to the stability of floating as well as submerged bodies : 1. A submerged body is stable when the centre of gravity is below the centre of buoyancy. 2. A floating body is stable when the centre of gravity is above the centre of buoyancy. 3. A floating body is stable when the centre of gravity is below the metacentre. 4. A submerged body is in stable equilibrium when the centre of gravity coincides with the centre of buoyancy. Of these statements :....
MCQ->The following statements relate to the pressure exerted by a fluid on a Submerged curved surface : 1. The vertical component of hydrostatic force acting on a submerged curved surface acts through the centre of volume of the fluid directly above the submerged area. 2. The horizontal component of the force acting on a curved surface is the hydrostatic force acting on the vertical projection of the curved surface. 3. The resultant force on a curved surface acts on the bottom of th6 curved surface. Of these statements :....
MCQ->In arc welding, the electric arc is produced between the work and the electrode by....
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