MD MachShopTheo. 5 Pt.2

Low helix angle drills are preferred for drilling holes in ___.

• plastics

• cast steel

• bronze

• carbon steel

The pinch effect in welding is the result of what?

• expansion of gases in the arch

• residual stress caused by molten metal

• electromagnetic forces

• electrostatic field

Which of the following is used to reduce friction, remove heat, remove chips and protect against corrosion.

• water vapor

• carbon

• air

• cutting fluid

Which of the following is a good heat remove, but it promote rust?

• air

• kerosene

• carbon dioxide

• water

Addition of ___ to water produces an efficient, inexpensive cutting fluid that does not promote rusting.

• sal soda

• kerosene lubricants

• straight cutting oils

• air

It reduces friction and do not cause rust but are less efficient of heat removal than water ___.

• sal soda

• kerosene lubricants

• straight cutting oils

• air

• flank wear

• nose failure

• crater wear

• tool life

After any cutting or standard grinding operation, the surface of a workplace will consist of ___.

• smear metal

• ultrafinishing

• superfinishing

• centerless grinding

A method that does not require clamping, chucking, or holding round workpieces.

• centerless grinding

• laser machining

• chemical milling

• ultrafinishing

Which of the following used high-energy electrical discharges to shape electrically conducting workpiece?

• electrochemical machining

• electrochemical grinding

• electrical discharge machining

• ultrasonic grinding