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4

It is required to cut screw threads of 2 mm pitch on a lathe. The lead screw has a pitch of 6 mm. If the spindle speed is 60 r.p.m., then the speed of lead screw will be

A. 10 r.p.m.

B. 20 r.p.m.

C. 120 r.p.m.

D. 180 r.p.m.

Correct Answer :

B. 20 r.p.m.


Related Questions

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The hole to be drilled for tapping is _________ the outside diameter of the thread on the tap.

A. Equal to

B. Smaller than

C. Greater than

D. None of these

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For harder alloy steel, the point angle of the drill is kept

A. Equal to 118°

B. Less than 118°

C. More than 118°

D. Any one of these

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As the cutting speed increases, the tool cutting forces

A. Remain constant

B. Increases

C. Decreases

D. First increases and then decreases

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Lathe bed is made of

A. Mild steel

B. Alloy steel

C. Pig iron

D. Chilled cast iron

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The angle on which the strength of the tool depends is

A. Rake angle

B. Cutting angle

C. Clearance angle

D. Lip angle

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When the metal is removed by erosion caused by rapidly recurring spark discharges between the tool and work, the process is known as

A. Electrochemical machining

B. Electro-discharge machining

C. Ultrasonic machining

D. None of these

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The lathe spindles at the nose end have

A. Internal screw threads

B. External screw threads

C. No threads

D. Tapered threads

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Which of the following statement is correct regarding grinding of high carbon steel?

A. Grinding at high speed results in the reduction of chip thickness and cutting forces per grit.

B. Aluminium oxide wheels are employed.

C. The grinding wheel has to be of open structure.

D. All of the above

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In which of the following machine, the work is usually rotated while the drill is fed into work?

A. Sensitive drilling machine

B. Radial drilling machine

C. Gang drilling machine

D. Deep hole drilling machine

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The operation in which oil is permeated into the pores of a powder metallurgy product is known as

A. Mixing

B. Sintering

C. Impregnation

D. Infiltration

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In a CNC program block, N002 GO2 G91 X40 Z40......, GO2 and G91 refer to

A. Circular interpolation in counter clockwise direction and incremental dimension

B. Circular interpolation in counter clockwise direction and absolute dimension

C. Circular interpolation in clockwise direction and incremental dimension

D. Circular interpolation in clockwise direction and absolute dimension

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The different spindle speeds on a lathe form

A. Arithmetical progression

B. Geometrical progression

C. Harmonical progression

D. Any one of these

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The average cutting speed for turning brass with a high speed steel tool is

A. 15 to 19 m/min

B. 25 to 31 m/min

C. 60 to 90 m/min

D. 90 to 120 m/min

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The example of snag grinding is

A. Trimming the surface left by sprues and risers on castings

B. Grinding the parting line left on castings

C. Removing flash on forgings

D. All of these

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The rear teeth of a broach

A. Perform burnishing operation

B. Remove minimum metal

C. Remove maximum metal

D. Remove no metal

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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.

A. 2.17 rpm, 600 joules

B. 6.8 rpm, 6 joules

C. 5.03 rpm, 600 joules

D. 22 rpm, 600 joules

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The main purpose of a boring operation, as compared to drilling, is to

A. Drill a hole

B. Finish the drilled hole

C. Correct the hole

D. Enlarge the existing hole

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Ultrasonic machining is best suited for

A. Tool steels

B. Sintered carbides

C. Glass

D. All of these

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In a centre lathe, the cutting tool is fed in _________ with reference to the lathe axis.

A. Cross direction only

B. Longitudinal direction only

C. Both cross and longitudinal direction

D. Any direction

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Two streams of liquid metal which are not hot enough to fuse properly result into a casting defect known as

A. Cold shut

B. Swell

C. Sand wash

D. Scab

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High speed steel cutting tools operate at cutting speeds _________ than carbon steel tools.

A. 2 to 3 times lower

B. 2 to 3 times higher

C. 5 to 8 times higher

D. 8 to 20 times higher

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The object of caulking in a riveted joint is to make the joint

A. Free from corrosion

B. Stronger in tension

C. Free from stresses

D. Leak-proof

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Which of the following statement is correct about EDM machining?

A. It can machine hardest materials.

B. It produces high degree of surface finish.

C. The tool and work are never in contact with each other.

D. All of these

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When the shear angle is small

A. Path of shear is short and chip is thin

B. Path of shear is large and chip is thick

C. Path of shear is short and chip is thick

D. Path of shear is large and chip is thin

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4

In drilling aluminium, a drill with

A. Zero helix angle is used

B. Low helix angle is used

C. High helix angle is used

D. Any helix angle can be used

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The common welding error that occurs due to shrinkage of weld metal, faulty clamping of parts, faulty penetration or overheating at joints is called?

A. Distortion

B. Warping

C. Porous weld

D. Poor fusion

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The process of removing metal by a cutter which is rotated against the direction of travel of workpiece, is called

A. Up milling

B. Down milling

C. Face milling

D. End milling

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Chemical milling operation is performed

A. On universal milling machine

B. On plain milling machine

C. In a tank containing an etching solution

D. Any one of these

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An open structure of a grinding wheel is used for

A. Soft materials

B. Tough materials

C. Ductile materials

D. All of these

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In a metal arc welding process, a gas metal arc welding with magnetized flux is used and can be done in all the positions i.e. flat position, vertical position or inclined position.

A. Globular transfer

B. Spray transfer

C. GMAW practice

D. Dip transfer