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157.

Assertion (A): Climb or down milling operation ensures smoother operation of the machine tool and longer tool life as compared to the conventional up milling operation.
Reason (R): In Climb or down milling operation, the rotational motion of the cutter as well as the feed motion of the work-piece are in the same direction and the depth of cut is maximum at the every point as the cutter engages the work-piece.
(a) Both A and R are individually true and R is correct explanation of A
(b) Both A and R are individually true and R is not correct explanation of A
(c) A is true but R is false
(d) A is false but R is true

asked in Mechanical Paper-2, 2010

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158.

Assertion (A): It is generally difficult to weld aluminium parts by normal arc welding process.
Reason (R): Hard and brittle aluminium-oxide film is formed at the welded joints.
(a) Both A and R are individually true and R is correct explanation of A
(b) Both A and R are individually true and R is not correct explanation of A
(c) A is true but R is false
(d) A is false but R is true

asked in Mechanical Paper-2, 2010

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159.

Assertion (A): Straight polarity is always recommended for carbon-electrode welding.
Reason (R): Carbon arc is stable in straight polarity.
(a) Both A and R are individually true and R is correct explanation of A
(b) Both A and R are individually true and R is not correct explanation of A
(c) A is true but R is false
(d) A is false but R is true

asked in Mechanical Paper-2, 2010

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160.

Assertion (A): Oxidizing flame is used in gas welding to join medium carbon steels having high melting point.
Reason (R): In gas welding, oxidizing flame produces the maximum temperature compared to neutral and reducing flame.
(a) Both A and R are individually true and R is correct explanation of A
(b) Both A and R are individually true and R is not correct explanation of A
(c) A is true but R is false
(d) A is false but R is true

asked in Mechanical Paper-2, 2010

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161.

Assertion (A): The investment casting is used for precision parts such as turbine plates, sewing machines etc.
Reason (R): The investment casting have a good surface finish and are exact reproductions of the master pattern.
(a) Both A and R are individually true and R is correct explanation of A
(b) Both A and R are individually true and R is not correct explanation of A
(c) A is true but R is false
(d) A is false but R is true

asked in Mechanical Paper-2, 2010

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162.

Assertion (A): Pickling and washing of rolled rods are carried out before wire drawing.
Reason (R): They lubricate the surface to reduce friction while drawing wires.
(a) Both A and R are individually true and R is correct explanation of A
(b) Both A and R are individually true and R is not correct explanation of A
(c) A is true but R is false
(d) A is false but R is true

asked in Mechanical Paper-2, 2010

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