Mechanical Engineering - Workshop Technology

26. 

The shrinkage allowance for cast iron pattern is

A. 10 mm/m
B. 16 mm/m
C. 20 mm/m
D. 26 mm/m

Answer: Option A

Explanation:

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27. 

An oxidising flame is obtained when equal volumes of oxygen and acetylene are supplied.

A. True
B. False

Answer: Option B

Explanation:

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28. 

A neutral flame is obtained by supplying

A. equal volumes of oxygen and acetylene
B. more volume of oxygen and less volume of acetylene
C. more volume of acetylene and less volume of oxygen
D. none of the above

Answer: Option A

Explanation:

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29. 

An oxidising process used for aluminium and magnesium articles is called

A. galvanising
B. anodising
C. parkerising
D. sheradising

Answer: Option B

Explanation:

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30. 

For welding plates of thickness less than 5 mm, its edges

A. do not require bevelling
B. should be bevelled to a single-V or U-groove
C. should have a double-V or U-groove on one side
D. should have a double-V or U-groove on both sides

Answer: Option A

Explanation:

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