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4

If a gas metal arc process uses a low arc voltage and the arc is continuously interrupted as the molten electrode metal fills up the arc gap is known as

A. ARC

B. Short ARC

C. ARC length

D. ARC blow

Correct Answer :

B. Short ARC


Related Questions

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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

The machining of titanium is difficult due to

A. High thermal conductivity of titanium

B. Chemical reaction between tool and work

C. Low tool-chip contact area

D. None of these

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4

The width of cutting edge of a parting off tool varies from

A. 3 to 12 mm

B. 5 to 20 mm

C. 8 to 30 mm

D. 15 to 40 mm

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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

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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Continuous chips with built up edge are formed during machining of

A. Brittle metals

B. Ductile metals

C. Hard metals

D. Soft metals

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4

Misrun is a casting defect which occurs due to

A. Very high pouring temperature of the metal

B. Insufficient fluidity of the molten metal

C. Absorption of gases by the liquid metal

D. Improper alignment of the mould flasks

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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

In a gating system, the ratio 1: 2: 4 represents

A. Sprue base area: runner area: ingate area

B. Pouring basin area: ingate area: runner area

C. Sprue base area: ingate area: casting area

D. Runner area: ingate area: casting area

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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

The tool material, for faster machining, should have

A. Wear resistance

B. Red hardness

C. Toughness

D. All of these

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4

The lead screw of a lathe has _________ threads.

A. Single start

B. Double start

C. Multi-start

D. Any one of these

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4

The hardness of a grinding wheel is determined by the

A. Hardness of abrasive grains

B. Ability of the bond to retain abrasives

C. Hardness of the bond

D. Ability of the grinding wheel to penetrate the work piece

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4

In metal machining, the work-tool contact zone is a zone where heat is generated due to

A. Plastic deformation of metal

B. Burnishing friction

C. Friction between the moving chip and the tool face

D. None of the above

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4

In grinding irregular, curved, tapered, convex and concave surfaces, the grinder used is

A. Cylindrical grinder

B. Internal grinder

C. Surface grinder

D. Tool and cutter grinder

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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 tool life is affected by

A. Depth of cut

B. Cutting speed

C. Feed

D. All of these

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4

A feed gear box for a screw cutting lathe is designed on the basis of

A. Geometric progression

B. Arithmetic progression

C. Harmonic progression

D. None of these

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4

Friction at the tool-chip interface can be reduced by

A. Decreasing the rake angle

B. Increasing the depth of cut

C. Decreasing the cutting speed

D. Increasing the cutting speed

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4

Climb milling is chosen while machining because

A. The chip thickness increase gradually

B. It enables the cutter to dig in and start the cut

C. The specific power consumption is reduced

D. Better surface finish can be obtained

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4

Larger than 15° side cutting edge angle

A. Increases tool life

B. Decreases tool life

C. Produces chipping and decreases tool life

D. Results in excessive stress concentration and greater heat generation

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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

In which of the following milling machine, the table can be tilted in a vertical plane by providing a swivel arrangement at the knee?

A. Universal milling machine

B. Plain milling machine

C. Universal milling machine

D. Hand milling machine

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4

The chuck used for setting up of heavy and irregular shaped work should be

A. Four jaw independent chuck

B. Three jaw universal chuck

C. Magnetic chuck

D. Drill chuck

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4

The trade name of a nonferrous cast alloy composed of cobalt, chromium and tungsten is called

A. Ceramic

B. Stellite

C. Diamond

D. Cemented carbide

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4

The method of centre less grinding used to produce taper is

A. In-feed grinding

B. Through feed grinding

C. End feed grinding

D. Any one of these

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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

The grade of grinding wheel depends upon

A. Hardness of the material being ground

B. Speed of wheel and work

C. Condition of grinding machine

D. All of these

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4

Which type of motor is not used in axis or spindle drives of CNC machine tools?

A. Induction motor

B. DC servo motor

C. Stepper motor

D. Linear servo motor

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4

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