69) Oranges were purchased at the rate of 100 for Rs. 150/- and sold at Rs.2/- per orange. If a profit of Rs.200/- was made, number of oranges sold is

200

400

800

600

Answer is:

400

120

180

Answer is:

The process uses amplified light energy as a source of welding

The power density of laser beam is much higher compared to an arc welding process

The process essentially requires a vacuum

Focusing of laser beam towards the joint is possible

Answer is:

Conduct the heat transfer

Increase the strength of the joint

to avoid rusting of the mild steel filler rod during long storage

To give good appearance to the wire

Answer is: