illumination

Short Notes on Welding and Heating

1. Arc having Negative volt-ampere characteristics . 2. In AC arc welding ( 80 to 1oo volt of 0.35 lagging Power factor ) a high leakage transfor…

1. Lumen efficiency of carbon arc lamp 9 lumen /watt. 2. lumen efficiency of vaccum filament lamp 10 lumen /watt to 14 lumen /watt. 3. M eltin…

1. Which of the following statement id correct? A. Light is a form of heat energy B. Light is a f…