The effective number of lattice points in the unit cell of simple cubic, body centred cubic, and face centred cubic space lattices, respectively, are
1, 2, 2
1, 2, 4
2, 3, 4
2, 4, 4
Correct Answer :
B. 1, 2, 4
Related Questions
The angle made by the face of the tool and the plane parallel to the base of cutting tool is called
Rake angle
Cutting angle
Clearance angle
Lip angle
In which of the following machine, the work rotates and the tool is stationary?
Vertical boring machine
Horizontal boring machine
Precision boring machine
Jig boring machine
In a CNC program block, N002 GO2 G91 X40 Z40......, GO2 and G91 refer to
Circular interpolation in counter clockwise direction and incremental dimension
Circular interpolation in counter clockwise direction and absolute dimension
Circular interpolation in clockwise direction and incremental dimension
Circular interpolation in clockwise direction and absolute dimension
Allowance in limits and fits refers to
Maximum clearance between shaft and hole
Minimum clearance between shaft and hole
Difference between maximum and minimum sizes of hole
Difference between maximum and minimum sizes of shaft
A CNC vertical milling machine has to cut a straight slot of 10 mm width and 2mm depth by a cutter of 10 mm diameter between points (0,0) and (100,100) on the XY plane (dimensions in mm). The feed rate used for milling is 50 mm/min, milling time for the slot (in seconds) is
120
170
180
240
In order to prevent tool from rubbing the work _________ on tools are provided.
Rake angles
Relief angles
Face angles
None of these
With the same tool life, the maximum material per minute is removed by
Increasing the cutting speed
Decreasing the cutting speed
Increasing the depth of cut
Increasing the feed rate
The method of centre less grinding used to produce taper is
In-feed grinding
Through feed grinding
End feed grinding
Any one of these
Relief angles on high speed steel tools usually vary from
0° to 3°
3° to 10°
10° to 20°
20° to 30°
The cutting speed for counter-boring should be _________ that of drilling operation.
Equal to
Less than
Greater than
None of these
A single point thread cutting tool should ideally hav
Zero rake angle
Positive rake angle
Negative rake angle
Point angle
In drilling aluminium, a drill with
Zero helix angle is used
Low helix angle is used
High helix angle is used
Any helix angle can be used
Cutting fluids are used to
Cool the tool
Improve surface finish
Cool the workpiece
All of these
Hardness of steel greatly improves with
Annealing
Cyaniding
Normalizing
Tempering
A __________ grinding wheel is used to grind soft materials.
Course grained
Medium grained
Fine grained
None of these
In an orthogonal cutting, the depth of cut is halved and the feed rate is double. If the chip thickness ratio is unaffected with the changed cutting conditions, the actual chip thickness will be
Doubled
Halved
Quadrupled
Unchanged
The cutting speed is maximum while machining __________ with a high speed steel tool.
Cast iron
Mild steel
Brass
Aluminium
A dynamometer is a device used for the measurement of
Chip thickness ratio
Forces during metal cutting
Wear of the cutting tool
Deflection of the cutting tool
For fast removal of materials during grinding, a _________ grinding wheel is used.
Course grained
Fine grained
Medium grained
None of these
The floating position of the holding fixture in a rotary transfer device is used to
Improve the accuracy of location
Reduce the tendency to over-index
Improve upon the acceleration and deceleration characteristics
Reduce the cycle time
While cutting helical gears on a non-differential gear hobber, the feed change gear ratio is
Independent of index change gear ratio
Dependent on speed change gear ratio
Interrelated to index change gear ratio
Independent of speed and index change gear ratio
In a centre lathe, the cutting tool is fed in _________ with reference to the lathe axis.
Cross direction only
Longitudinal direction only
Both cross and longitudinal direction
Any direction
The cutting fluid mostly used for machining steel is
Water
Soluble oil
Dry
Heavy oils
Which of the following statement is correct as regard to up milling?
It cannot be used on old machines due to backlash between the feed screw of the table and the nut.
The chips are disposed off easily and do not interfere with the cutting.
The surface milled appears to be slightly wavy.
The coolant can be poured directly at the cutting zone where the cutting force is maximum.
The velocity of tool along the tool face is known as
Shear velocity
Chip velocity
Cutting velocity
Mean velocity
Threading is an operation of
Smoothing and squaring the surface around a hole
Sizing and finishing a small diameter hole
Producing a hole by removing metal along the circumference of a hollow cutting tool
Cutting helical grooves on the external cylindrical surface
The height of each tooth of a broach is
Same throughout
In progressively decreasing order
In progressively increasing order
None of these
The taper on the lathe spindle is
1 in 10
1 in 15
1 in 20
1 in 30
A dense structure of a grinding wheel is used for
Hard materials
Brittle materials
Finishing cuts
All of these
As tool and work are not in contact in EDM process
No relative motion occurs between them
No wear of tool occurs
No power is consumed during metal cutting
No force between tool and work occurs