Category: Materials and Construction

A. High co-efficient of friction between journal and bearing
B. Ability to retain lubricant on its surface
C. Low co-efficient of friction between journal and bearing
D. Both B. & C.

A. Steel
B. Aluminium
C. Glass
D. Lead lined

A. Do not increase in plasticity with rise in temperature
B. Allow slip to occur between molecules
C. Do not take on a permanent set
D. None of these

A. Vanadium
B. Niobium
C. Chromium
D. Nickel

A. Silicon
B. Phosphorus
C. Sulphur
D. None of these

A. High silicon iron, Kel-F and Teflon
B. Tin and wood
C. Silicone rubber
D. Stainless steel

A. The toughness of a material decreases, when it is heated
B. Crane hooks are normally made of wrought iron
C. Cold working of a metal decreases its fatigue strength
D. The temperature at which new grains are formed in a metal is known as the recrystallisation
temperature

A. High speed
B. Stainless
C. Heat resisting
D. None of these

A. Acid resistant, brittle and very hard
B. High silicon iron
C. Prone to breakage due to thermal expansion because of its very high co-efficient of thermal
expansion
D. All A., B. and C.

A. Bronze
B. Solder
C. Duralumin
D. Monel metal