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661.

On a die accurate holes are to be drilled. Which machine would you prefer for this operation?

A.	Radial drilling machine	B.	Portable drilling machine
C.	Multi-pindle drilling machine	D.	Jig boring machine

662.

The efficiency of abrasive particles depends up

A.	purity	B.	uniformity in composition
C.	hardness	D.	All of the above

663.

Which of the following plate can be used for milling the sides of a hexagon nut?

A.	24 hole circle plate	B.	3 hole circle plate
C.	45 hole circle plate	D.	55 hole circle plate

664.

A gear is to have 14 teeth. Which of the following indexing movement can be used?

A.	3 complete turns on a 42 hole circle	B.	2 complete turns and 6 holes in 18 hole circle
C.	2 complete turns and 18 holes in 21 hole circle	D.	2 complete turns and 36 holes in 49 hole circle

665.

Broaching is primarily done for

A.	better finish	B.	mass production
C.	cylindrical jobs	D.	hard materials

666.

Which of the following drilling machine is used for mass production?

A.	Bench drilling machine	B.	Radial drilling machine
C.	Pistol drilling machine	D.	Gang drilling machine

667.

While using high speed steel tools, the cutting speed will be highest for which of the following steel?

A.	Mild steel	B.	Medium carbon steel
C.	Alloy	D.	Stainless steel

668.

While machining copper alloys with HSS tools, the cutting speed is

A.	20 to 30 m/min	B.	50 to 100 m/min
C.	100 to 150 m/min	D.	200 to 300 m/min

669.

The depth of cut depends on the

A.	curring speed	B.	rigidity of machine tool
C.	tool material	D.	all of the above

670.

Depth of cut is normally

A.	less for roughing operation and more for finishing operation	B.	more for roughing operation and less for finishing operation
C.	same for roughing as well as finishing operations