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 |
Answer: Option B
Explanation:
|
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 |
Answer: Option D
Explanation:
|
33. |
The contraction allowance for magnesium is around |
A. |
1 mm/metre |
B. |
5 mm/metre |
C. |
14 mm/metre |
D. |
25 mm/metre |
Answer: Option C
Explanation:
|
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 |
Answer: Option D
Explanation:
|
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 |
Answer: Option B
Explanation:
|
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 |
Answer: Option B
Explanation:
|
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 |
Answer: Option D
Explanation:
|
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 |
Answer: Option C
Explanation:
|
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 |
Answer: Option D
Explanation:
|
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 |
Answer: Option B
Explanation:
|
Read more:
|
|