The stroke of a shaping machine is 250 mm. It makes 30 double strokes per minute. The overall average speed of operation is
3.75 m/min
5 m/min
7.5 m/min
15 m/min
Correct Answer :
C. 7.5 m/min
Related Questions
Which of the following process is used for preparing parts having large curved surfaces and thin sections?
Hot machining
Ultrasonic machining
ECM process
Chemical milling
The process of changing the shape of grinding wheel as it becomes worn due to breaking away of the abrasive and bond, is called
Truing
Dressing
Facing
Clearing
The mechanism of material removal in EDM process is
Melting and Evaporation
Melting and Corrosion
Erosion and Cavitations
Cavitations and Evaporation
A fixture is defined as a device which
Holds and locates a workpiece and guides and controls one or more cutting tools
Holds and locates a workpiece during an inspection or for a manufacturing operation
Is used to check the accuracy of workpiece
All of the above
In a plain milling cutter, the portion of the gash adjacent to the cutting edge on which the chip impinges is called
Face
Fillet
Land
Lead
Crater wear occurs mainly on the
Nose part, front relief face and side relief face of the cutting tool
Face of the cutting tool at a short distance from the cutting edge only
Cutting edge only
Front face only
The surface finish is improved by the increase in
Cutting speed
Nose radius
True rake angle
All of these
A broach has
Roughing teeth
Semi-finishing teeth
Finishing teeth
All of these
In electro discharge machining, tool is made of
Brass
Copper
Copper tungsten alloy
All of these
Segmental chips are formed during machining
Mild steel
Cast iron
High speed steel
High carbon steel
A dense structure of a grinding wheel is used for
Hard materials
Brittle materials
Finishing cuts
All of these
If the diameter of the hole is subject to considerable variation, then for locating in jigs and fixtures, the pressure type of locator used is
Conical locator
Cylindrical locator
Diamond pin locator
Vee locator
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
Down milling is also called
Conventional milling
Climb milling
End milling
Face milling
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
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
Climb milling is chosen while machining because
The chip thickness increase gradually
It enables the cutter to dig in and start the cut
The specific power consumption is reduced
Better surface finish can be obtained
The broaching operation in which the work moves past the stationary tool is called
Pull broaching
Push broaching
Surface broaching
Continuous broaching
A bottoming tap has
Its end tapered for about three or four threads
Its end tapered for about eight or ten threads
Full threads for the whole of its length
None of the above
Hard and tough materials like cast iron should be turned at
Slow speed
High speed
Any speed
Certain specific speed
In grinding irregular, curved, tapered, convex and concave surfaces, the grinder used is
Cylindrical grinder
Internal grinder
Surface grinder
Tool and cutter grinder
The tool life is affected by
Depth of cut
Cutting speed
Feed
All of these
The enlarging of an existing circular hole with a rotating single point tool is called
Boring
Drilling
Reaming
Internal turning
If a gas metal arc process uses a low arc voltage and the arc is continuously interrupted as the molten electrode metal fills up the arc gap is known as
ARC
Short ARC
ARC length
ARC blow
The grinding of long, slender shafts or bars is usually done by
In-feed grinding
Through feed grinding
End-feed grinding
Any one of these
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 a gating system, the ratio 1: 2: 4 represents
Sprue base area: runner area: ingate area
Pouring basin area: ingate area: runner area
Sprue base area: ingate area: casting area
Runner area: ingate area: casting area
In transverse grinding
The work is reciprocated as the wheel feeds to produce cylinders longer than the width of wheel face
The work rotates in a fixed position as the wheel feeds to produce cylinders equal to or shorter than the width of wheel face
The work is reciprocated as the wheel feeds to produce cylinders shorter than the width of wheel face
The work rotates in a fixed position as the wheel feeds to produce cylinders longer than the width of wheel face
In an interchangeable assembly, shafts of size 25.000 -0.010⁺⁰⁰⁴⁰ mm mate with holes of size 25.000 -0.020⁺⁰⁰³⁰, the maximum interference (in microns) in the assembly is
40
30
20
10
The common welding error that occurs due to shrinkage of weld metal, faulty clamping of parts, faulty penetration or overheating at joints is called?
Distortion
Warping
Porous weld
Poor fusion