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The cutting speed for drilling aluminium, brass and bronze with carbon steel drills is _________ cutting speed for drilling mild steel with high speed steel drills.
The machanism involved in the removal of metal in drilling operation is by
In lapping operation, the amount of metal removed is
The cutting speed for counter-boring should be _________ that of drilling operation.
The main purpose of a boring operation, as compared to drilling, is to
The operation of producing cup shaped parts from flat sheet metal blanks by bending and plastic flow of metal, is known as
If 1/2 of the air in a tank is removed with each stroke of a vacuum pump, what fraction of the original amount of air has been removed after four strokes ?
The average of five numbers is 25. After one if the numbers is removed, the average of the remaining is 31. What number has been removed?
If 1/2 of the air in a tank is removed with each stroke of a vacuum pump,what fraction of the original amount of air has been removed after 4 strokes?
The average of six numbers is 7 . If two of the six numbers are removed , the average of the remaining numbers is 8. What is the sum of the two numbers which were removed?