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Comments
Question
Austenitic manganese steel used for making jaws of crushing machines contains about __________ percent manganese.
Options
A. 1.5-2
B. 3.5-4.5
C. 7-9
D. 12-14
Correct Answer
12-14
Materials and Construction problems
Search Results
1. The addition of antimony in tin-based alloys improves its
Options
A. rupture strength and hot hardness.
B. impact strength and bonding strength.
C. deformation resistance.
D. wear resistance.
Show Answer
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Discuss
Correct Answer: deformation resistance.
2. Aluminium as a material of construction suffers from the disadvantage of
Options
A. very high cost.
B. rather low tensile strength.
C. very low strength to weight ratio.
D. scarce availability.
Show Answer
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Discuss
Correct Answer: rather low tensile strength.
3. Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (l/20th of ordinary metals)?
Options
A. Invar
B. Constantan
C. Chromel
D. Alumel
Show Answer
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Discuss
Correct Answer: Invar
4. Acetylene gas holder is made of
Options
A. copper
B. cast iron
C. steel
D. monel metal
Show Answer
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Discuss
Correct Answer: steel
5. Shock resisting steels should possess high
Options
A. hardness
B. toughness
C. tensile strength
D. wear resistance
Show Answer
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Discuss
Correct Answer: toughness
6. Softness of silver can be converted into hardness by alloying it with small quantity of
Options
A. copper & nickel
B. zinc
C. aluminium
D. tin
Show Answer
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Discuss
Correct Answer: copper & nickel
7. 18/8 steel is a/an __________ stainless steel.
Options
A. austenitic
B. ferritic
C. martensitic
D. none of these
Show Answer
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Discuss
Correct Answer: austenitic
8. Liquid ammonia is shipped in __________ containers.
Options
A. steel
B. aluminium
C. glass
D. lead lined
Show Answer
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Discuss
Correct Answer: glass
9. A suitable material of construction to use with fuming sulphuric acid is
Options
A. carbon steel
B. stainless steel type 304
C. nickel
D. monel
Show Answer
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Discuss
Correct Answer: monel
10. The hardest material just prior to diamond in Mho's scale is
Options
A. topax
B. carborundum
C. corrundum
D. calcite
Show Answer
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Discuss
Correct Answer: corrundum
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