A. mild steel

C. cast iron

D. lead

E. german silver

B. tin

C. aluminium

D. zinc

E. lead

A. none of the above

B. greater than 7

C. pH value has nothing to do with neutral solution

D. less than 7

A. manganese in steel induces hardness

B. nickel and chromium in steel help in raising the elastic limit and improve the resilience and ductility

C. sulphur, phosphorous and lead improve machining properties of steel

D. tungsten in steels improves magnetic properties and hardenability

A. improves wear resistance, cutting ability and toughness

B. improves cutting ability and reduces hardenability

D. refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

E. none of the above

A. orthorhombic crystal

B. face centred cubic

D. hexagonal close packed

E. cubic structure

A. 0.25%

B. 0.06%

C. 0.10%

D. 0.8%.

B. RC 48

C. RC 32

D. RC 65

E. RC 80

A. grey iron

B. spheroidal iron

C. none of the above

D. nodular iron

B. chromium

C. silicon

D. none of the above

E. nickel

B. 0.50%

C. 1.5%.

D. 0.20%

E. 0.80%

A. chromium alloys

B. none of the above

D. magnesium alloys

E. magnetic steel alloys

A. forged steel

C. cast iron

D. mild steel

E. H.S.S

B. cementite and gamma iron

C. pearlite and ferrite

D. ferrite and iron graphite

E. ferrite and austenite

A. contains l.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron

B. none of the above

C. is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

D. is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material

A. nodular form

B. flat form

C. combined form

D. free form

A. wrought iron

B. non-ferrous materials

C. mild steel

D. cast iron

B. decrease

C. first decrease and then increase

D. first increase and then decrease

E. remain constant

A. improvement of casting characteristics

B. none of the above

D. improvement of corrosion resistance

E. one of the best known age and precipitation-hardening systems

B. 1.30%

C. 6.3%.

D. 0.20%

E. 0.80%

B. 0.25 to 0.5%

C. 0.7 to 0.9%

D. 0.1 to 0.2%

E. 1.0 to 1.2%.

A. above melting point

C. between 910C and 1400C

D. room temperature

E. none of the above

A. silicon and sulphur

B. none of the above

D. sulphur, graphite and aluminium

E. phosphorous and aluminium

A. basic

C. acidic

D. none of the above

E. brittle

A. zinc

B. sulphur, phosphorus, lead

D. vanadium, aluminium

E. tungsten, molybdenum, vanadium, chromium

A. improves wear resistance, cutting ability and toughness

C. improves cutting ability and reduces hardenability

D. gives ductility, toughness, tensile strength and anticorrosion properties

E. raises its melting point

A. is produced by annealing process. It is soft, tough and easily machined metal

B. none of the above

C. contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron

E. is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

B. german silver

C. copper

D. silver

E. gold

A. cold hardness

B. toughness

C. wear resistance

E. sharp cutting edge

B. uniform in all directions

C. none of the above

D. perpendicular to lines of slag distribution

E. unpredictable

A. ferrite and iron graphite

B. pearlite and ferrite

C. ferrite and austenite

D. ferrite and cementite

A. 60:40:00

C. 50:50:00

D. 40 : 60

E. 70:30:00

B. high maehinability

C. low melting point

D. good fluidity

E. high tensile strength

A. zinc, sulphur, and chromium

C. none of the above

D. tungsten, molybdenum and phosphorous

E. lead, tin, aluminium

A. contain carbon in free form

B. require least cutting force

D. can be cut freely even under adverse conditions

E. do not exist

B. permit further cold working

C. soften material

D. relieve stresses

E. improve machining characteristic

A. tin and lead

B. tin, lead and silver

C. tin, copper and lead

E. tin and copper

B. 85-92% copper and rest zinc

C. 90% copper and 10% tin

D. 70-78% copper and rest tin

E. 70% copper and 30% zinc

A. a complex cubic structure

C. B.C.C. crystalline structure

D. H.C.P. structure

E. orthorhombic crystalline structure

B. iron scrap

C. raw material for blast furnace

D. iron in molten form in the ladles

E. iron containing huge quantities of carbon

A. is also known as chilled cast iron am is obtained by cooling rapidly. It i: almost unmachinable

B. is produced by small additions o magnesium (or cerium) in the ladle Graphite is in nodular or spheroida form and is well dispersed throughout the material

D. is produced by annealing process. I is soft, tough and easily machinec metal

E. none of the above is true

A. 70-75% copper and rest tin

B. 90% copper and 10% tin

C. 85-92% copper and rest tin with little lead and nickel

E. 70% copper and 30% tin

A. zinc, tin, lead

B. nickel, lead and tin

C. nickel, molybdenum

E. none of the above

A. steel

C. MgO

D. german silver

E. Si02

A. 85-92% copper and rest tin with little lead and nickel

C. 70-75% copper and rest tin

D. 70% copper and 30% zinc

E. 90% copper and 10% zinc

B. alpha iron and beta iron

C. alpha iron, beta iron and gamma iron

D. body centred cubic a-iron and face centred cubic a-iron

E. none of the above

A. free carbon

C. flakes

D. spheroids

E. cementite

A. reduces the grain size

B. acts as deoxidiser

C. decreases tensile strength and hardness

D. increases hardness

B. It can be easily forge welded

C. It is very soft and ductile

D. It melts at 1535C

E. It contains carbon of the order of 0 to 0.25%

A. 1% silver

B. 2.5% silver

C. 10% silver

E. 100% silver