Mechanical Engineering - Engineering Materials

1. 

Chromium when added to steel __________ the tensile strength.

A. does not effect
B. decreases
C. increases

Answer: Option C

Explanation:

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2. 

Which of the following is added in low carbon steels to prevent them from becoming porous?

A. Sulphur
B. Phosphorus
C. Manganese
D. Silicon

Answer: Option D

Explanation:

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3. 

A steel with carbon __________ is known as hypo-eutectoid steel.

A. 0.8%
B. below 0.8%
C. above 0.8%

Answer: Option B

Explanation:

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4. 

Free cutting steels

A. contain carbon in free from
B. require minimum cutting force
C. is used where rapid machining is the prime requirement
D. can be cut freely

Answer: Option C

Explanation:

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5. 

The presence of hydrogen in steel causes

A. reduced neutron absorption cross-section
B. improved weldability
C. embrittlement
D. corrosion resistance

Answer: Option C

Explanation:

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