25) The grades of tolerances are represented by number symbols in BIS system of limits. How many grades of tolerance are there in this system of limits?

Answer is:

18

1:20

1:10

1:50

1:15

Answer is:

thread plug gauge

centre gauge

angle gauge

screw pitch gauge

Answer is:

slowly in the furnace itself by switching off the heat supply

by removing from the furnace and allowing it to cool in open air

by removing from the furnace and placing it under blast of air

by removing from the furnace and dipping it in a tank containing water

Answer is:

V-thread

Knuckle thread

Square thread

Acme thread

Answer is: