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4

Low helix angle drills are preferred for drilling holes in

A. Plastics

B. Copper

C. Cast steel

D. Carbon steel

Correct Answer :

A. Plastics


Related Questions

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4

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

A. 120

B. 170

C. 180

D. 240

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4

In order to grind soft material

A. Coarse grained grinding wheel is used

B. Fine grained grinding wheel is used

C. Medium grained grinding wheel is used

D. Any one of these

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4

Which of the following parameters influence the axial feed rate in centerless grinding?

A. Regulating wheel diameter

B. Speed of the regulating wheel

C. Angle between the axes of grinding and regulating wheels

D. All of the above

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4

A ring gauge is used to measure

A. Outside diameter but not roundness

B. Roundness but not outside diameter

C. Both outside diameter and roundness

D. Only external threads

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4

EDM machining is applied for

A. Shaping carbide dies and punches having complicated profiles

B. Making large number of small holes in sieves and fuel nozzles

C. Embossing and engraving on harder materials

D. All of these

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4

Flank wear occurs mainly on the

A. Nose part, front relief face and side relief face of the cutting tool

B. Face of the cutting tool at a short distance from the cutting edge

C. Cutting edge only

D. Front face only

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4

A jig is defined as a device which

A. Holds and locates a workpiece and guides and controls one or more cutting tools

B. Holds and locates a workpiece during an inspection or for a manufacturing operation

C. Is used to check the accuracy of workpiece

D. All of the above

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4

In oblique cutting system, the maximum chip thickness

A. Occurs at the middle

B. May not occur at the middle

C. Depends upon the material of the tool

D. Depends upon the geometry of the tool

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4

If the tearing efficiency of a riveted joint is 50%, then ratio of rivet hole diameter to the pitch of rivets is

A. 0.20

B. 0.30

C. 0.50

D. 0.60

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4

Buffing wheels are made of

A. Softer metals

B. Cotton fabric

C. Carbon

D. Graphite

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4

The broaching operation in which the work moves past the stationary tool is called

A. Pull broaching

B. Push broaching

C. Surface broaching

D. Continuous broaching

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4

The method of grinding used to produce internal cylindrical holes and tapers, is

A. Internal cylindrical grinding

B. Form grinding

C. External cylindrical grinding

D. Surface grinding

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4

For machining a mild steel workpiece using carbide tool, the maximum material will be removed at a temperature of

A. 50°C

B. 100°C

C. 175°C

D. 275°C

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4

If the cutting speed is increased, then the built-up-edge

A. Becomes longer

B. May or may not form

C. Becomes smaller and finally does not form at all

D. Has nothing to do with speed

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4

Ceramic tools are fixed to tool body by

A. Soldering

B. Brazing

C. Welding

D. Clamping

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4

A tool used to withdraw a drill from the sleeve is called

A. Drill remover

B. Drill puller

C. Drift

D. Drill drawer

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4

A drill bit of 20 mm diameter rotating at 500 r.p.m. with a feed rate of 0.2 mm/revolution is used to drill a through hole in a mild steel plate 20 mm thickness. The depth of cut in this drilling operation is

A. 0.2 mm

B. 10 mm

C. 20 mm

D. 100 mm

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4

The cutting force in up milling __________ per tooth movement of the cutter.

A. Is zero

B. Is maximum

C. Decreases from maximum to zero

D. Increases from zero to maximum

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4

In a shaper, the length of stroke is increased by

A. Increasing the centre distance of bull gear and crank pin

B. Decreasing the centre distance of bull gear and crank pin

C. Increasing the length of the arm

D. Decreasing the length of the slot in the slotted lever

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4

It is desired to perform the operations like drilling, reaming, counter-boring etc. on a work piece. Which of the following machine will be used?

A. Sensitive drilling machine

B. Radial drilling machine

C. Gang drilling machine

D. Multiple spindle drilling machine

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4

Which of the following statement is correct about nose radius?

A. It improves tool life

B. It improves the surface finish

C. Both (A) and (B)

D. None of these

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4

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

A. 40

B. 30

C. 20

D. 10

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4

Which of the following statement is correct for oblique cutting system?

A. The cutting edge is inclined at an angle less than 90° with the normal to the velocity of the tool.

B. Frequently, more than one cutting edges are in action.

C. The chip flows on the tool face at an angle less than 90° with the normal on the cutting edge.

D. All of the above

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4

Cutting fluids are used to

A. Cool the tool

B. Improve surface finish

C. Cool the workpiece

D. All of these

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4

What is the type of shielding gas for GTAW (Gas Tungsten Arc Welding) used for carbon steels only called?

A. Argon H₂

B. Argon CO₂

C. Argon Helium

D. Helium

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4

Match the following metal forming processes with their associated stresses in the work piece.
Metal forming processTypes of stress
1. CoiningP. Tensile
2. Wire DrawingQ. Shear
3. BlankingR. Tensile and compressive
4. Deep DrawingS. Compressive

A. 1-S, 2-P, 3-Q, 4-R

B. 1-S, 2-P, 3-R, 4-Q

C. 1-P, 2-Q, 3-S, 4-R

D. 1-P, 2-R, 3-Q, 4-S

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4

The lip angle of a single point tool is usually

A. 20° to 40°

B. 40° to 60°

C. 60° to 80°

D. None of these

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4

The abrasive recommended for grinding materials of high tensile strength is

A. Silicon carbide

B. Aluminium oxide

C. Sand stone

D. Diamond

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4

The increase in depth of cut and feed rate __________ surface finish.

A. Improves

B. Deteriorates

C. Does not effect

D. None of these

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4

What is the type of welding defect caused due to poor manipulation of weld rod or a dirty joint called?

A. Porosity

B. Undercut

C. Under fill

D. Crack