Grinding wheels should be tested for balance
Only at the time of manufacture
Before starting the grinding operation
At the end of grinding operation
Occasionally
Correct Answer :
D. Occasionally
Related Questions
A twist drill is specified by its
Shank, material and diameter
Shank, lip angle and size of flute
Material, length of body and helix angle
Any one of these
The effect of setting a boring tool above centre height leads to
Increase in the effective rake angle and a decrease in the effective clearance angle
Increase in both effective rake angle and effective clearance angle
Decrease in the effective rake angle and an increase in the effective clearance angle
Decrease in both effective rake angle and effective clearance angle
The ratio between two consecutive spindle speeds for a six-speed drilling machine using drills of diameter 6.25 to 25 mm size and at a cutting velocity of 18 m/min is
1.02
1.32
1.66
1.82
Chip breakers are used to
Increase tool life
Remove chips from bed
Break the chips into short segments
To minimise heat generation
For generating a Coons surface we require
A set of grid points on the surface
A set of grid control points
Four bounding curves defining the surface
Two bounding curves and a set of grid control points
Gear finishing operation is called
Shaping
Milling
Hobbing
Burnishing
The grinding operation is a
Shaping operation
Forming operation
Surface finishing operation
Dressing operation
A solid cylinder of diameter 100 mm and height 50 mm is forged between two frictionless flat dies to a height of 25mm. The percentage change in diameter is
0
2.07
20.7
41.4
In hot machining, the work is heated by
Simple heating
Flame heating
Induction heating
Any one of these
Which of the following engineering materials is the most suitable candidate for hot chamber die casting?
Low carbon steel
Titanium
Copper
Tin
The ductile materials, during machining, produce
Continuous chips
Discontinuous chips
Continuous chips with built up edge
Either (A) or (C)
Fixtures are used
For holding and guiding the tool in drilling, reaming or tapping operations
For holding the work in milling, grinding, planing or turning operations
To check the accuracy of workpiece
None of the above
Trepanning is an operation of
Making a cone-shaped enlargement of the end of a hole
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
What is the type of welding defect caused due to shrinkage during solidification and by weld stresses called?
Incomplete fusion
Lamellar tearing
Mismatch
Shrinkage void
The in-feed grinding is used to
Produce tapers
Grind shoulders and formed surfaces
Grind long, slender shafts or bars
All of these
Stellite preserves hardness upto a temperature of
350°C
500°C
900°C
1100°C
When the tool moves parallel to the lathe axis, the movement is termed as
Cross feed
Angular feed
Longitudinal feed
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°
In a planer
Tool is stationary and work reciprocates
Work is stationary and tool reciprocates
Tool moves over stationary work
Tool moves over reciprocating work
A 15 mm drilling machine means that it can drill a hole
Of maximum diameter 15 mm
In 15 mm thick plates
Having cross-sectional area of 15 mm²
None of these
A process of removing metal by pushing or pulling a cutting tool is called
Up milling
Down milling
Forming
Broaching
In Oxyacetylene gas welding, temperature at the inner cone of the flame is around
3500⁰C
3200⁰C
2900⁰C
2550⁰C
A broach has
Roughing teeth
Semi-finishing teeth
Finishing teeth
All of these
Side rake angle of a single point cutting tool is the angle
By which the face of the tool is inclined towards back
By which the face of the tool is inclined sideways
Between the surface of the flank immediately below the point and a plane at right angles to the centre line of the point of the tool
Between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base
The operation of producing grooves around the periphery of a cylindrical or conical workpiece is called
Profile milling
Gang milling
Saw milling
Helical milling
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
The average cutting speed for turning brass with a high speed steel tool is
15 to 19 m/min
25 to 31 m/min
60 to 90 m/min
90 to 120 m/min
The correct sequence of tool materials in increasing order of their ability to retain their hot hardness is
Carbide, ceramic, cermet, borazon
Ceramic, carbide, borazon, cermet
Cermet, carbide, ceramic, borazon
Borazon, ceramic, carbide, cermet
Grinding wheels should be tested for balance
Only at the time of manufacture
Before starting the grinding operation
At the end of grinding operation
Occasionally
The machining of titanium is difficult due to
High thermal conductivity of titanium
Chemical reaction between tool and work
Low tool-chip contact area
None of these