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4

Hardness of green sand mould increases with

A. Increase in moisture content beyond 6 percent

B. Increase in permeability

C. Decrease in permeability

D. Increase in both moisture content and permeability

Correct Answer :

C. Decrease in permeability


Related Questions

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4

The lip angle is the angle

A. Between the tool face and the ground end surface of flank

B. Made by the face of the tool and the plane parallel to the base of the cutting tool

C. Between the face of the tool and a line tangent to the machined surface at the cutting point

D. None of the above

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4

The relief or clearance at the cutting edge of a flat drill varies from

A. 3° to 8°

B. 20° to 30°

C. 60° to 90°

D. 90° to 120°

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4

An operation of embossing a diamond shaped pattern on the surface of a workpiece, is known as

A. Counter-boring

B. Grooving

C. Knurling

D. Facing

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4

The cutting speed for drilling aluminium, brass and bronze with carbon steel drills is _________ cutting speed for drilling mild steel with high speed steel drills.

A. Equal to

B. Less than

C. More than

D. None of these

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4

The rake angle of a single point cutting tool corresponds to _________ of a twist drill.

A. Lip clearance angle

B. Helix angle

C. Point angle

D. Chisel edge angle

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4

Hardness of green sand mould increases with

A. Increase in moisture content beyond 6 percent

B. Increase in permeability

C. Decrease in permeability

D. Increase in both moisture content and permeability

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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

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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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

A coarse 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

The height of each tooth of a broach is

A. Same throughout

B. In progressively decreasing order

C. In progressively increasing order

D. None of these

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4

Which of the following statement is correct as regard to up milling?

A. It cannot be used on old machines due to backlash between the feed screw of the table and the nut.

B. The chips are disposed off easily and do not interfere with the cutting.

C. The surface milled appears to be slightly wavy.

D. The coolant can be poured directly at the cutting zone where the cutting force is maximum.

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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

A twist drill is a

A. Side cutting tool

B. Front cutting tool

C. End cutting tool

D. None of these

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4

Which one of the following is a solid state joining process?

A. Gas tungsten arc welding

B. Resistance spot welding

C. Friction welding

D. Submerged arc welding

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4

The hard grade grinding wheels are denoted by the letters

A. A to H

B. I to P

C. Q to Z

D. A to P

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4

Which of the following statement is correct about hot machining?

A. It requires less power than machining metals at room temperature.

B. The rate of tool wear is lower.

C. It is used for machining high strength and high temperature resistant materials.

D. All of the above

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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

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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

The vector sum of cutting velocity and chip velocity is __________ shear velocity.

A. Equal to

B. Less than

C. More than

D. None of these

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4

The chamfering is an essential operation after

A. Knurling

B. Rough turning

C. Boring

D. Thread cutting

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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

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

The enlarging of an existing circular hole with a rotating single point tool is called

A. Boring

B. Drilling

C. Reaming

D. Internal turning

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4

For softer materials, 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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4

A diamond locating pin is used in jigs and fixtures because

A. Diamond is very hard and wear resistant

B. It occupies very little space

C. It helps in assembly with tolerance on centre distance

D. It has a long life

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4

A solid cylinder of diameter 100 mm and height 50 mm is forged between two frictionless flat dies to a height of 25mm. The percentage change in diameter is

A. 0

B. 2.07

C. 20.7

D. 41.4

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4

The work or surface speed for cylindrical grinding varies from

A. 5 to 10 m/min

B. 10 to 20 m/min

C. 20 to 30 m/min

D. 40 to 60 m/min

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4

When the cutting edge of the tool is dull, then during machining

A. Continuous chips are formed

B. Discontinuous chips are formed

C. Continuous chips with built-up edge are formed

D. No chips are formed

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4

A tool used to withdraw a drill from the sleeve is called

A. Drill remover

B. Drill puller

C. Drift

D. Drill drawer