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.Management Sciences
Category: Materials and Construction
Thermoplastic resins are those polymers, which____________________?
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A. Has decreased plasticity at increasing temperature
B. Cannot be moulded
C. Easily deform under pressure at high temperature
D. None of these
The ability of a material to offer resistance to scratching or indentation is a measure of its_________________?
A. Brittleness
B. Toughness
C. Hardness
D. Resilience
_____________ moulding process cannot be used for thermoplastic plastics?
A. Compression
B. Extrusion
C. Injection
D. None of these
Spark plugs are made of______________________?
A. High alumina ceramic
B. Metallic carbides
C. Corundum
D. Carborundum
Acid proof stoneware_________________?
A. Has very low strength
B. Cannot be heated
C. Is broken by small temperature changes
D. All A., B. and C.
Wrought iron is a suitable material of construction for handling _____________ solutions?
A. Dilute acidic
B. Concentrated acidic
C. Alkalis & alkaline
D. None of these
Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid (HF) at 100°C ?
A. Monel
B. Stainless steel
C. Graphite
D. Kel-F and Teflon
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