In centre less grinders, the maximum angular adjustment of the regulating wheel is
5°
10°
15°
20°
Correct Answer :
B. 10°
Related Questions
In a single point tool, the angle between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base, is known as
Side relief angle
End relief angle
Back rake angle
Side rake angle
While current is shut down in the welding circuit, what kind of voltage exists between the output terminals of the welding machine?
GTAW
Open air cut voltage
Kerf
Gouging
The tool material, for faster machining, should have
Wear resistance
Red hardness
Toughness
All of these
For harder alloy steel, the point angle of the drill is kept
Equal to 118°
Less than 118°
More than 118°
Any one of these
The strength of a brazed joint
Decreases with increase in gap between the two joining surfaces
Increases with increase in gap between the two joining surfaces
Decreases up to certain gap between the two joining surfaces beyond which it increases
Increases up to certain gap between the two joining surfaces beyond which it decreases
The relation between the tool life (T) in minutes and cutting speed (V) in m/min is (where n = An exponent, which depends upon the tool and workpiece, and C = A constant)
VnT = C
VTn = C
Vn/T = C
V/Tn = C
The cutting speed is minimum while machining _________ with a high speed steel tool.
Cast iron
Mild steel
Brass
Aluminium
Which of the following operations is carried out at a minimum cutting velocity if the machines are equally rigid and the tool work materials are the same?
Turning
Grinding
Boring
Milling
A left hand tool on a lathe cuts most efficiently when it travels
From left to right end of the lathe bed
From right to left end of the lathe bed
With the help of a compound slide
Across the bed
A twist drill is a
Side cutting tool
Front cutting tool
End cutting tool
None of these
The actual feed in centerless grinders is given by (where d = Dia. of regulating wheel, n = Revolutions per minute, and α = Angle of inclination of wheel)
πd
πdn
πdn sinα
πdn cosα
Glazing in grinding wheels __________ cutting capacity.
Has no effect on
Increase
Decrease
None of these
In metal machining, the zone where the heat is generated due to friction between the moving chip and the tool face, is called
Friction zone
Work-tool contact zone
Shear zone
None of these
The thrust force will increase with the increase in
Side cutting edge angle
Tool nose radius
Rake angle
End cutting edge angle
The size of abrasive grain required in a grinding wheel depends upon the
Amount of material to be removed
Hardness of material being ground
Finish desired
All of these
The hardness of a grinding wheel is determined by the
Hardness of abrasive grains
Ability of the bond to retain abrasives
Hardness of the bond
Ability of the grinding wheel to penetrate the work piece
Which of the following statement is wrong?
The diamond is the hardest tool material and can run at cutting speeds about 50 times that of high speed steel tool.
The ceramic tools can be used at cutting speeds 40 times that of high speed steel tools.
The cemented carbide tools can be used at cutting speeds 10 times that of high speed steel tools.
The ceramic tools can withstand temperature upto 600°C only.
Which of the following parameters influence the axial feed rate in centerless grinding?
Regulating wheel diameter
Speed of the regulating wheel
Angle between the axes of grinding and regulating wheels
All of the above
The operation of making a cone-shaped enlargement of the end of a hole is known as
Counter-sinking
Counter-boring
Trepanning
Spot facing
Work speed of circular electrode of 220 mm diameter for carrying out seam welding at 4 welds per cm on 1.6 mm thick mild steel tube. Welding cycle consists of 3 cycles on and 2 cycles off Power supply is at 50 Hz. Calculate R.P.M. and energy requirement of the above circular electrodes assuming effective resistance between electrodes as 100 ohm.
2.17 rpm, 600 joules
6.8 rpm, 6 joules
5.03 rpm, 600 joules
22 rpm, 600 joules
Ceramic tools are fixed to tool body by
Soldering
Brazing
Welding
Clamping
The broaching operation in which either the work or the tool moves across the other, is known as
Pull broaching
Push broaching
Surface broaching
Continuous broaching
In the relation VTn = C, the value of n for carbide tools is
0.1 to 0.2
0.20 to 0.25
0.25 to 0.40
0.40 to 0.55
The lead screw of a lathe has _________ threads.
Single start
Double start
Multi-start
Any one of these
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
The cutting tool in a milling machine is mounted on
Spindle
Arbor
Column
Knee
The operation in which oil is permeated into the pores of a powder metallurgy product is known as
Mixing
Sintering
Impregnation
Infiltration
The material property which depends only on the basic crystal structure is
Fatigue strength
Work hardening
Fracture strength
Elastic constant
The operation performed on a shaper is
Machining horizontal surface
Machining vertical surface
Machining angular surface
All of these
The tool may fail due to
Cracking at the cutting edge due to thermal stresses
Chipping of the cutting edge
Plastic deformation of the cutting edge
All of these