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4

For machining a mild steel workpiece by a high speed steel tool, the average cutting speed is

A. 5 m/min

B. 10 m/min

C. 15 m/min

D. 30 m/min

Correct Answer :

D. 30 m/min


Related Questions

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4

A 15 mm drilling machine means that it can drill a hole

A. Of maximum diameter 15 mm

B. In 15 mm thick plates

C. Having cross-sectional area of 15 mm²

D. None of these

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4

The operation of machining several surfaces of a workpiece simultaneously is called

A. Profile milling

B. Gang milling

C. Saw milling

D. Helical milling

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4

In ECM, the material removal is due to

A. Corrosion

B. Erosion

C. Fusion

D. Ion displacement

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4

The size of a shaper is given by

A. Stroke length

B. Motor power

C. Mass of machine

D. Rate size

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4

A broach has

A. Roughing teeth

B. Semi-finishing teeth

C. Finishing teeth

D. All of these

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4

The rake angle of a single point cutting tool corresponds to _________ of a twist drill.

A. Lip clearance angle

B. Helix angle

C. Point angle

D. Chisel edge angle

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4

The chamfering is an essential operation after

A. Knurling

B. Rough turning

C. Boring

D. Thread cutting

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4

Trepanning is performed for

A. Finishing a drilled hole

B. Producing a large hole without drilling

C. Truing a hole for alignment

D. Enlarging a drilled hole

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4

Which of the following is the correct data structure for solid models?

A. Solid part - faces - edges - vertices

B. Solid part - edges - faces - vertices

C. Vertices - edges - faces - solid parts

D. Vertices - faces- edges - solid parts

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4

The addition of lead, sulphur and phosphorus to low carbon steels, help to

A. Reduce built up edge

B. Break up chips

C. Improve machinability

D. All of these

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4

The primary purpose of a sprue in a casting mould is to

A. Feed the casting at a rate consistent with the rate of solidification.

B. Act as a reservoir for molten metal

C. Feed molten metal from the pouring basin to the gate

D. Help feed the casting until all solidification takes place

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4

The cutting speed for drilling __________ with high speed steel drills is 24 to 45 m/min.

A. Mild steel

B. Copper

C. Aluminium

D. Brass

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4

The grinding of long, slender shafts or bars is usually done by

A. In-feed grinding

B. Through feed grinding

C. End-feed grinding

D. Any one of these

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4

The specific cutting energy used for establishing the machinability of the metal depends upon its

A. Coefficient of friction

B. Microstructure

C. Work hardening characteristics

D. All of these

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4

The size of abrasive grain required in a grinding wheel depends upon the

A. Amount of material to be removed

B. Hardness of material being ground

C. Finish desired

D. All of these

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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

The cutting speed for counter-boring should be _________ that of drilling operation.

A. Equal to

B. Less than

C. Greater than

D. None of these

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4

The shear velocity is the velocity of

A. Tool relative to the workpiece

B. Chip relative to the tool

C. Tool along the tool face

D. None of these

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4

The material property which depends only on the basic crystal structure is

A. Fatigue strength

B. Work hardening

C. Fracture strength

D. Elastic constant

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4

The type of tool used on lathe, shaper and planer is

A. Single point cutting tool

B. Two point cutting tool

C. Three point cutting tool

D. Multipoint cutting tool

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4

The advantage of a broaching operation is that

A. Rate of production is very high

B. High accuracy and high class of surface finish is possible

C. Roughing and finishing cuts are completed in one pass of the tool

D. All of the above

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4

The lathe centres are provided with standard taper known as

A. Morse taper

B. Seller's taper

C. Chapman taper

D. Brown and Sharpe taper

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4

The hardness of a grinding wheel is specified by

A. Brinell hardness number

B. Rockwell hardness number

C. Vickers pyramid number

D. Letter of alphabet

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4

Hardness of green sand mould increases with

A. Increase in moisture content beyond 6 percent

B. Increase in permeability

C. Decrease in permeability

D. Increase in both moisture content and permeability

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4

In which type of welding a gas shield, a consumable electrode is used and the welding can be done in all positions.

A. ARC welding

B. Submerged ARC welding

C. TIG welding

D. MIG welding

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4

The swing diameter over the bed is ________ the height of the centre measured from the bed of the lathe.

A. Equal to

B. Twice

C. Thrice

D. One-half

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4

What is the welding defect caused due to improper control and poor removal of slog between passes called?

A. Mismatch

B. Under fill

C. Crack

D. Porosity

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4

Hot rolling of mild steel is carried out

A. At recrystallization temperature

B. Between 100⁰C to 150⁰C

C. Between recrystallization temperature

D. Above recrystallization temperature

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4

The cutting speed of a drill depends upon the

A. Material of drill

B. Type of material to be drilled

C. Quality of surface finish desired

D. All of these

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4

Which of the following statement is correct in regard to centreless grinding?

A. The workpiece is supported throughout its entire length as grinding takes place.

B. It is a continuous process and adopted for production work.

C. It requires no holding device for the work.

D. All of the above