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Current Affairs January 2024

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4

The operation of smoothing and squaring the surface around a hole is known as

A. Counter-sinking

B. Counter-boring

C. Trepanning

D. Spot facing

Correct Answer :

D. Spot facing


Related Questions

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4

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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4

Fixtures are used

A. For holding and guiding the tool in drilling, reaming or tapping operations

B. For holding the work in milling, grinding, planing or turning operations

C. To check the accuracy of workpiece

D. None of the above

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4

Glazing in grinding wheels __________ cutting capacity.

A. Has no effect on

B. Increase

C. Decrease

D. None of these

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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

Segmental chips are formed during machining

A. Mild steel

B. Cast iron

C. High speed steel

D. High carbon steel

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4

Carbide tipped tools usually have

A. Negative rake angle

B. Positive rake angle

C. Any rake angle

D. No rake angle

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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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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

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4

The cutting speed is minimum while machining _________ with a high speed steel tool.

A. Cast iron

B. Mild steel

C. Brass

D. Aluminium

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4

The velocity of tool along the tool face is known as

A. Shear velocity

B. Chip velocity

C. Cutting velocity

D. Mean velocity

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4

Which of the following statement is wrong about ultrasonic machining?

A. It is best suited for machining hard and brittle materials

B. It cuts materials at very slow speeds

C. It removes large amount of material

D. It produces good surface finish

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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

The tap used to cut threads in a blind hole is

A. Taper tap

B. Second tap

C. Bottoming tap

D. Any one of these

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4

The main purpose of spheroidising treatment is to improve

A. Hardenability of low carbon steels

B. Machinability of low carbon steels

C. Hardenability of high carbon steels

D. Machinability of high carbon steels

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4

Which of the following operation is first performed?

A. Spot facing

B. Boring

C. Tapping

D. Drilling

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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

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

In drilling brass, 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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4

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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4

The tool may fail due to

A. Cracking at the cutting edge due to thermal stresses

B. Chipping of the cutting edge

C. Plastic deformation of the cutting edge

D. All of these

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4

The grooving is an operation of

A. Bevelling the extreme end of a workpiece

B. Embossing a diamond shaped pattern on the surface of a workpiece

C. Reducing the diameter of a workpiece over a very narrow surface

D. Enlarging the end of a hole cylindrically

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4

The factor responsible for the formation of continuous chips with built up edge is

A. Low cutting speed and large rake angle

B. Low cutting speed and small rake angle

C. High cutting speed and large rake angle

D. High cutting speed and small rake angle

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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

A fine grained grinding wheel is used to grind

A. Hard and brittle materials

B. Soft and ductile materials

C. Hard and ductile materials

D. Soft and brittle materials

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4

High speed steel drills can be operated at about _________ the speed of high carbon steel drills.

A. One-half

B. One-fourth

C. Double

D. Four times

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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

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4

The operation performed on a shaper is

A. Machining horizontal surface

B. Machining vertical surface

C. Machining angular surface

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

In an orthogonal cutting, the depth of cut is halved and the feed rate is double. If the chip thickness ratio is unaffected with the changed cutting conditions, the actual chip thickness will be

A. Doubled

B. Halved

C. Quadrupled

D. Unchanged

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4

In which of the following machine, the work rotates and the tool is stationary?

A. Vertical boring machine

B. Horizontal boring machine

C. Precision boring machine

D. Jig boring machine