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4

A grinding wheel becomes glazed (i.e. cutting edge takes a glasslike appearance) due to

A. Wear of bond

B. Breaking of abrasive grains

C. Wear of abrasive grains

D. Cracks on grinding wheel

Correct Answer :

C. Wear of abrasive grains


Related Questions

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4

In lapping operation, the amount of metal removed is

A. 0.005 to 0.01 mm

B. 0.01 to 0.1 mm

C. 0.05 to 0.1 mm

D. 0.5 to 1 mm

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4

A type of welding flows, which is the result of a perfect proportion and mixture of acetylene and oxygen and is used for fusion welding of steel and cast iron, is

A. Carburizing flame

B. Oxidizing flame

C. Oxy-acetylene flame

D. Neutral flame

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4

The capacity of a material to be welded under the imposed fabrication conditions into a specific, suitably designed structure and to perform satisfactorily in the intended service is known as?

A. Weldment

B. Weld tab

C. Weldability

D. Tack weld

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4

Internal or external threads of different pitches can be produced by

A. Pantograph milling machine

B. Profiling machine

C. Planetary milling machine

D. Piano miller

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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

A process of removing metal by pushing or pulling a cutting tool is called

A. Up milling

B. Down milling

C. Forming

D. Broaching

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4

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

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4

In determining the various forces on the chip, Merchant assumed that the

A. Cutting edge of the tool is sharp and it does not make any flank contact with the workpiece

B. Only continuous chip without built-up-edge is produced

C. Cutting velocity remains constant

D. All of the above

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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

What is the type of joining process called, where the parts to be welded are kept in contact and rotated relative to each other and axial pressure is applied when the desired temperature is obtained?

A. Ultrasonic welding

B. Forge welding

C. Electron beam welding

D. Friction welding

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4

A bottoming tap has

A. Its end tapered for about three or four threads

B. Its end tapered for about eight or ten threads

C. Full threads for the whole of its length

D. None of the above

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4

In machining metals, surface roughness is due to

A. Feed marks or ridges left by the cutting tool

B. Fragment of built-up edge on the machined surface

C. Cutting tool vibrations

D. All of these

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4

For turning small taper on long workpiece, the suitable method is

A. By a form tool

B. By setting over the tail stock

C. By a taper turning attachment

D. By swivelling the compound rest

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4

The factor responsible for the formation of discontinuous chips 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

The maximum production of small and slender parts is done by

A. Watch maker's lathe

B. Sliding head stock automatic lathe

C. Multi-spindle automatic lathe

D. Capstan lathe

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4

Allowance in limits and fits refers to

A. Maximum clearance between shaft and hole

B. Minimum clearance between shaft and hole

C. Difference between maximum and minimum sizes of hole

D. Difference between maximum and minimum sizes of shaft

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4

A drill mainly used in drilling brass, copper or softer materials, is

A. Flat drill

B. Straight fluted drill

C. Parallel shank twist drill

D. Tapered shank twist drill

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4

The factor which affects the tool life is

A. Tool geometry

B. Cutting speed

C. Feed rate

D. All of these

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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

In a shaper, the metal is removed during

A. Forward stroke

B. Return stroke

C. Both the forward and return strokes

D. Neither the forward nor the return stroke

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4

In machining metals, chips break due to __________ of work material.

A. Toughness

B. Ductility

C. Elasticity

D. Work hardening

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4

Grinding wheels should be tested for balance

A. Only at the time of manufacture

B. Before starting the grinding operation

C. At the end of grinding operation

D. Occasionally

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4

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

A. Up milling

B. Down milling

C. Face milling

D. End milling

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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

In DC arc welding, if leads are arranged in work as Negative pole of the welding arc and electrode as Positive pole of the welding arc, the arrangement is known as

A. Fusion

B. Reverse polarity

C. Forward welding

D. Direct polarity

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4

What is the type of welding defect caused due to poor deposition of weld rod is called?

A. Porosity

B. Undercut

C. Under fill

D. Crack

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4

The crystal structure of austenite is

A. Body centred cubic

B. Base centred cubic

C. Hexagonal closed packed

D. Body centred tetragonal

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4

The stroke of a shaping machine is 250 mm. It makes 30 double strokes per minute. The overall average speed of operation is

A. 3.75 m/min

B. 5 m/min

C. 7.5 m/min

D. 15 m/min

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4

The purpose of jigs and fixtures is to

A. Increase machining accuracy

B. Facilitate interchangeability

C. Decrease expenditure on quality control

D. All of these

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4

The snag grinding is done

A. To produce good surface finish and high degree of accuracy

B. To remove considerable amount of metal without regard to accuracy of the finished surface

C. To grind exterior cylindrical surfaces

D. Any one of the above