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Engineering :: Foundry Technology


31.  Pattern maker's contraction rules are
A. different for different materials of patterns B. different for different materials of castings
C. same for all materials of castings

32.  The contraction allowance for pattern depends on
A. composition of the metal B. method of moulding used
C. pouring temperature D. all of the above

33.  The contraction allowance for magnesium is around
A. 1 mm/metre B. 5 mm/metre
C. 14 mm/metre D. 25 mm/metre

34.  In case of cast steel, the contraction allowance will be least for castings having dimensions
A. upto 600 mm B. 600 to 1000 mm
C. 1000 mm to 1800 mm D. above 1800 mm

35.  In case of cored aluminium castings, the contraction allowance is
A. more than the normal allowance B. less than the normal allowance
C. same as the normal allowance

36.  In case of malleable iron castings, the contraction allowance on pattern
A. increass as the section thickness of casting increases B. decreases as the section thickness of casting increases
C. is independent of section thickness

37.  The amount of machining allowance on castings depends on
A. size and shape of the casting B. casting orientation
C. characteristics of the metal D. all of the above

38.  Providing more than adequate machining allowance
A. improves the strength of the casting B. reduces the strength of the casting
C. increases machining cost D. reduces machining cost

39.  The draft allowance to be provided on a pattern depends on
A. the length of the vertical side of the pattern to be extracted B. the intricacy of the pattern
C. the method of moulding D. all of the above

40.  On the interior surfaces the draft allowance is usually
A. 10 to 20 mm/metre B. 40 to 60 mm/metre
C. 100 to 120 mm/metre D. 200 to 225 mm/metre




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