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461.

The power consumption in laser beam machining is of the order of

462.

Vacuum is the medium of machining in cases of

A.	Ultrasonic machining	B.	Plasma arc machining
C.	Laser beam machining	D.	Electron beam machining
E.	Electro discharge machining

463.

While machining copper alloys by electro chemical machining the electrolyte used is

464.

The advantage of electro chemical machining is

A.	There is virtually no wear of the tool	B.	No burrs are produced
C.	The rate of metal removal does not depend on the physical properties of the metal	D.	The surface produced is free from mechanical stresses
E.	All of the above

465.

The advantage of laser beam machining is

A.	High production rates	B.	Minimum heat affected zone
C.	Dissimilar metals can be welded	D.	Precise operation
E.	All of the above

466.

Which of the following source for laser beam can give the highest power density (W/mm2)?

A.	Plasma arc	B.	Electron beam
C.	Laser continuous	D.	Laser pulsed
E.	All have the same power density

467.

Which of the following process has the highest metal removal rate (mm33/min)

468.

Which of the following process has the lowest rate of metal removal?

A.	Electro discharge machining	B.	Electro chemical machining
C.	Abrasive jet machining	D.	Chemical machining
E.	Electron beam machining

469.

Which of the following metal is best suited for electro forming?

470.

For making complicated contours on carbide tools, which of the following process is preferred?

A.	Laser machining	B.	Diamond tool machining
C.	Electro discharge machining	D.	Electro chemical milling
E.	Plasma arc machining