Category: Engineering Materials

A. greater than 7
B. equal to 7
C. less than 7
D. pH value has nothing to do with basic solution
E. none of the above

A. promotes decarburisation
B. provides high hot hardness
C. forms very hard carbides and thus in-creases wear resistance
D. promotes retention of austenite
E. increases toughness

A. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
B. 92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg
C. 90% aluminium and 90% copper
D. 90% magnesium and 9% aluminium with some copper
E. 90% magnesium and 10% tin

A. stainless steel
B. gun metal
C. german silver
D. duralumin
E. cast iron

A. allotropic change
B. recrystallisation
C. heat treatment
D. precipitation
E. austempering

A. modulus of elasticity is fairly low
B. wear resistance is very good
C. fatigue strength is not high
D. creep strength limits its use to fairly low temperatures
E. corrosion resistance is good

A. decrease
B. increase
C. remain constant
D. first increase and then decrease
E. first decrease and then increase

A. body centred cubic
B. face centred cubic
C. hexagonal close packed
D. cubic structure
E. orthorhombic crystal

A. high maehinability
B. low melting point
C. high tensile strength
D. good fluidity
E. all of the above

A. white metal
B. solder admiralty
C. fusible metal
D. phosphor bronze
E. gun metal