The hard grade grinding wheels are denoted by the letters
A to H
I to P
Q to Z
A to P
Correct Answer :
C. Q to Z
Related Questions
Match the following metal forming processes with their associated stresses in the work piece.
| Metal forming process | Types of stress |
|---|---|
| 1. Coining | P. Tensile |
| 2. Wire Drawing | Q. Shear |
| 3. Blanking | R. Tensile and compressive |
| 4. Deep Drawing | S. Compressive |
1-S, 2-P, 3-Q, 4-R
1-S, 2-P, 3-R, 4-Q
1-P, 2-Q, 3-S, 4-R
1-P, 2-R, 3-Q, 4-S
The primary purpose of a sprue in a casting mould is to
Feed the casting at a rate consistent with the rate of solidification.
Act as a reservoir for molten metal
Feed molten metal from the pouring basin to the gate
Help feed the casting until all solidification takes place
Which of the following statement is wrong as regard to down milling?
It can not 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.
Which among the NC operations given below are continuous path operations? Arc Welding (AW), Drilling (D), Laser Cutting of Sheet Metal (LC), Milling (M), Punching in Sheet Metal (P), Spot Welding (SW)
AW, LC and M
AW, D, LC and M
D, LC, P and SW
D, LC, and SW
Which one among the following welding processes uses nonconsumable electrode?
Gas metal arc welding
Submerged arc welding
Gas tungsten arc welding
Flux coated arc welding
The purpose of jigs and fixtures is to
Increase machining accuracy
Facilitate interchangeability
Decrease expenditure on quality control
All of these
The operation of machining several surfaces of a workpiece simultaneously is called
Profile milling
Gang milling
Saw milling
Helical milling
The angle between the face and flank of the single point cutting tool is known as
Rake angle
Clearance angle
Lip angle
Point angle
Which of the following statement is incorrect with reference of lathe cutting tools?
The flank of the tool is the surface or surfaces below and adjacent to the cutting edges
The nose is the corner, arc or chamfer joining the side cutting and the end cutting edges
The heel is that part of the tool which is shaped to produce the cutting edges and face
The base is that surface of the shank which bears against the support and takes tangent pressure of the cut
The cutting force in punching and blanking operations mainly depends on
The modulus of elasticity of metal
The shear strength of metal
The bulk modulus of metal
The yield strength of metal
In centre less grinders, the maximum angular adjustment of the regulating wheel is
5°
10°
15°
20°
Hot rolling of mild steel is carried out
At recrystallization temperature
Between 100⁰C to 150⁰C
Between recrystallization temperature
Above recrystallization temperature
Low helix angle drills are preferred for drilling holes in
Plastics
Copper
Cast steel
Carbon steel
High speed steel drills can be operated at about _________ the speed of high carbon steel drills.
One-half
One-fourth
Double
Four times
Cutting fluids are used to
Cool the tool
Improve surface finish
Cool the workpiece
All of these
The different spindle speeds on a lathe form
Arithmetical progression
Geometrical progression
Harmonical progression
Any one of these
When the shear angle is small
Path of shear is short and chip is thin
Path of shear is large and chip is thick
Path of shear is short and chip is thick
Path of shear is large and chip is thin
Soft materials can not be economically ground due to
High temperature involved
Frequent wheel clogging
Rapid wheel wear
Low work piece stiffness
The swing diameter over the bed is ________ the height of the centre measured from the bed of the lathe.
Equal to
Twice
Thrice
One-half
When the tool moves parallel to the lathe axis, the movement is termed as
Cross feed
Angular feed
Longitudinal feed
Any one of these
Tool life is generally better when
Grain size of the metal is large
Grain size of the metal is small
Hard constituents are present in the microstructure of the tool material
None of the above
The method of grinding used to produce internal cylindrical holes and tapers, is
Internal cylindrical grinding
Form grinding
External cylindrical grinding
Surface grinding
During normalizing process of steel, the specimen is heated
Between the upper and lower critical temperature and cooled in still air.
Above the upper critical temperature and cooled in furnace.
Above the upper critical temperature and cooled in still air.
Between the upper and lower critical temperature and cooled in furnace.
The rake angle of a single point cutting tool corresponds to _________ of a twist drill.
Lip clearance angle
Helix angle
Point angle
Chisel edge angle
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
The tool life is said to be over if
Poor surface finish is obtained
There is sudden increase in cutting forces and power consumption
Overheating and fuming due to heat of friction starts
All of the above
The ductile materials, during machining, produce
Continuous chips
Discontinuous chips
Continuous chips with built up edge
Either (A) or (C)
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 rake angle required to machine brass by high speed steel tool is
0°
10°
20°
100°
In metal cutting operations, the shear angle is the angle made by the shear plane with the
Direction of the tool axis
Direction of tool travel
Perpendicular to the direction of the tool axis
Central plane of the workpiece