Austenite rs a combination of_________________?

A. Ferrite and cementite
B. Cementite and gamma iron
C. Ferrite and austenite
D. Ferrite and iron graphite

Recrystallisation temperature can belowered by_________________?

A. Purification of metal
B. Grain refinement
C. Working at lower temperature
D. All of the above

Basic solution is one which has pH value___________________?

A. Greater than 7
B. Equal to 7
C. Less than 7
D. Ph value has nothing to do with basic solution

Neutral solution is one which has pH value__________________?

A. Greater than 7
B. Less than 7
C. Equal to 7
D. Ph value has nothing to do with neutral solution

The correct composition of Babbit metal is__________________?

A. 87.75% sn, 4% cu, 8% sb, 0.25% bi
B. 90% sn, 2% cu, 4% sb, 2% bi, 2% mg
C. 87% sn, 4% cu, 8% sb, 1% al
D. 82% sn, 4% cu, 8% sb, 3% al, 3% mg

Foundry crucible is made of_________________?

A. mild steel
B. german silver
C. lead
D. cast iron

Aluminium bronze contains__________________?

A. 94% aluminium, 4% copper and 0.5% mn, mg, si and fe
B. 92.5% aluminium, 4% copper, 2% nickel, and 1.5% mg
C. 10% aluminium and 90% copper
D. 90% magnesium and 9% aluminium with some copper

White metal contains__________________?

A. 63 to 67% nickel and 30% copper
B. 88% copper and 10% tin and rest zinc
C. Alloy of tin, lead and cadmium
D. Silver and chromium

Which of the following has highest specific strength of all structural materials__________________?

A. Magnesium alloys
B. Titanium alloys
C. Chromium alloys
D. Magnetic steel alloys

Addition of silicon to aluminium results in____________________?

A. Improvement of casting characteristics
B. Improvement of corrosion resistance
C. One of the best known age and precipitation-hardening systems
D. Improving machinability