NCM Unit-2 Test

In Ultrasonic machining, the material is removed by

• anodic dissolution

• thermal melting

• abrasive action

• electrochemical oxidation

In Ultrasonic machining, the tool

• moves in transverse direction

• moves in longitudinal direction

• vibrates in transverse direction

• vibrates in longitudinal direction

Increase in abrasive grain size in USM results in

• Lower MRR, Higher surface finish

• Higher MRR, Lower surface finish

• Higher MRR, Higher surface finish

• Lower MRR, Lower surface finish

In USM process, which type of material can be easily machined

• Glass

• Stainless steel

• Brass

• Mild steel

What type of tool should be used to reduce power requirement during large dimeter hole drilling in USM

• Trepanning tool

• Annular cutters

• Drilling tool

• Hypodermic needle

AWJM can be used to cut

• Metals

• Non-metals

• Both a and b

• None of the above

For longer life of nozzle in AWJM, what type of material is used

• Tungsten carbide

• Sapphire

• Boron carbide

• Stainless steel

In abrasive water jet machining, the abrasive particles are added to the water stream

• After it exits the nozzle

• Before it enters the pumping unit

• Just before it enters the nozzle

• While it is in the nozzle

The material removal mechanism in AWJM is

• Melting and vaporisation

• Erosion or localised stress fields

• Ion displacement

• Spark erosion

In which process Catcher is used

• USM

• MAF

• AWJM

• AJM