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Which angle is determined by the helix angle in drill bit ?

• chisel angle

• clearance angle

• point angle

• rake angle

Fire is the combination of heat, fuel & ............................. .

Which angle is determined by the helix angle in drill bit ?

• chisel angle

• clearance angle

• point angle

• rake angle

Which metal is resistance to many types of acids ?

• chromium

• lead

• nickel

• tin

what is the defect if pores of the grinding wheel get clogged ?

• dressing

• drilling

• glazing

• loading

Explain various types of drilling machine.