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4

Shrinkage allowance on pattern is provided to compensate for shrinkage when

A. The temperature of liquid metal drops from pouring to freezing temperature

B. The metal changes from liquid to solid state at freezing temperature

C. The temperature of solid phase drops from freezing to room temperature

D. The temperature of metal drops from pouring to room temperature

Correct Answer :

C. The temperature of solid phase drops from freezing to room temperature


Related Questions

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4

Cast iron during machining produces

A. Continuous chips

B. Discontinuous chips

C. Continuous chips with built-up edge

D. None of these

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4

In oblique cutting system, the maximum chip thickness

A. Occurs at the middle

B. May not occur at the middle

C. Depends upon the material of the tool

D. Depends upon the geometry of the tool

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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 tool in a milling machine is mounted on

A. Spindle

B. Arbor

C. Column

D. Knee

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The in-feed grinding is used to

A. Produce tapers

B. Grind shoulders and formed surfaces

C. Grind long, slender shafts or bars

D. All of these

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4

If the cutting speed is increased, then the built-up-edge

A. Becomes longer

B. May or may not form

C. Becomes smaller and finally does not form at all

D. Has nothing to do with speed

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4

The ratio between two consecutive spindle speeds for a six-speed drilling machine using drills of diameter 6.25 to 25 mm size and at a cutting velocity of 18 m/min is

A. 1.02

B. 1.32

C. 1.66

D. 1.82

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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 guideways are of

A. Flat type

B. V-type

C. Dovetail type

D. Any one of these

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4

When 3-2-1 principle is used to support and locate a three dimensional work-piece during machining, the number of degrees of freedom that are restricted is

A. 7

B. 8

C. 9

D. 10

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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 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 high cutting speed and large rake angle of the tool will result in the formation of

A. Continuous chips

B. Discontinuous chip

C. Continuous chips with built up edge

D. None of these

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4

Tumbler gears in lathe are used to

A. Reduce the spindle speed

B. Cut gears

C. Give desired direction of movement to the lathe carriage

D. Drill a workpiece

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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

Tool life is generally better when

A. Grain size of the metal is large

B. Grain size of the metal is small

C. Hard constituents are present in the microstructure of the tool material

D. None of the above

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4

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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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

In a single point tool, the angle between the surface of the flank immediately below the point and a line drawn from the point perpendicular to the base, is known as

A. Side relief angle

B. End relief angle

C. Back rake angle

D. Side rake angle

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4

In a plain milling cutter, the chip space between the back of one tooth and the face of the next tooth is called

A. Face

B. Fillet

C. Gash

D. Land

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4

Internal gear cutting operation can be performed by

A. Milling

B. Shaping with rack cutter

C. Shaping with pinion cutter

D. Hobbing

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4

Shrinkage allowance on pattern is provided to compensate for shrinkage when

A. The temperature of liquid metal drops from pouring to freezing temperature

B. The metal changes from liquid to solid state at freezing temperature

C. The temperature of solid phase drops from freezing to room temperature

D. The temperature of metal drops from pouring to room temperature

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4

The facing 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. Machining the ends of a workpiece to produce a flat surface square with the axis

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4

The cutting speed for drilling copper with high speed steel drills varies from

A. 10 to 20 m/min

B. 18 to 30 m/min

C. 24 to 45 m/min

D. 60 to 90 m/min

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4

In a metal arc welding process, metal transfer across the arc may take place by a method of material transfer where the metal transfers across the arc is in larger drops. This is at the rate of 100 drops / sec or less, what is this known as

A. Globular transfer

B. Spray transfer

C. GMAW practice

D. Dip transfer

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4

The negative rake is usually provided on

A. High carbon steel tools

B. High speed steel tools

C. Cemented carbide tools

D. All of these

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4

The tool life is said to be over if

A. Poor surface finish is obtained

B. There is sudden increase in cutting forces and power consumption

C. Overheating and fuming due to heat of friction starts

D. All of the above

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4

In _________ operation, the cutting force is maximum when the tooth begins its cut and reduces it to minimum when the tooth leaves the work.

A. Up milling

B. Down milling

C. Face milling

D. End milling

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4

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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4

The soft grade grinding wheels are denoted by the letters

A. A to H

B. I to P

C. Q to Z

D. A to P