Chemical Engineering - Chemical Engineering Basics

1. 

Stainless steel is welded with difficulty because of

A. its high melting temperature.
B. chances of cracking.
C. oxide film formation.
D. chromium carbide formation.

Answer: Option C

Explanation:

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2. 

For preparation of porous bearings by powder metallurgy, preferred particle shape is

A. spherical
B. nodular
C. irregular
D. no preferred shape

Answer: Option A

Explanation:

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3. 

The maximum thickness of the metal which can be welded using ultrasonic welding is __________ mm.

A. 0.5
B. 3
C. 10
D. 25

Answer: Option B

Explanation:

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4. 

High speed steel tools retain their hardness upto a temperature of __________ °C.

A. 500
B. 750
C. 900
D. 1100

Answer: Option C

Explanation:

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5. 

Wrought iron does not have

A. uniform strength in all directions.
B. ability to hold protective coating.
C. high ductility & corrosion resistance.
D. easily weldable characteristics.

Answer: Option A

Explanation:

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