Gun metal contains__________________?

A. 70% copper and 30% zinc
B. 90% copper and 10% tin
C. 85-92% copper and rest tin with little lead and nickel
D. 70-78% copper and rest tin
E. 85-92% copper and rest zinc

Grey cast iron_____________________?

A. contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron
B. is also known as chilled cast iron am is obtained by cooling rapidly. It i: almost unmachinable
C. is produced by annealing process. I is soft, tough and easily machinec metal
D. 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
E. none of the above is true

Malleable cast iron _________________?

A. contains l.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron
B. is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
C. is produced by annealing process. It is soft, tough, and easily machined metal
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
E. none of the above

‘Killed steels’ are those steels__________________?

A. which are destroyed by burning
B. which after their destruction are recycled to produce fresh steel
C. which are deoxidised in the ladle with silicon and aluminium
D. in which carbon is completely burnt
E. which have poor properties due to improper manufacturing

Cobalt in steel __________________?

A. improves wear resistance, cuttinability and toughness
B. refines grain size and produces les tendency to carburisation, improve corrosion and heat resistant proper ties
C. improves cutting ability and reduce hardenability
D. gives ductility, toughness, tensile strength and anti corrosion property:
E. none of the above

Chromium in steel_________________?

A. improves wear resistance, cutting ability and toughness
B. refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
C. improves cutting ability and reduces hardenability
D. gives ductility, toughness, tensile strength and anticorrosion properties
E. makes steel hard

Chilled cast iron has____________________?

A. no graphite
B. a very high percentage of graphite
C. a low percentage of graphite
D. graphite as its basic constituent of composition
E. none of the above is true

Carbon steel is_______________?

A. made by adding carbon in steel
B. refined from cast iron
C. an alloy of iron and carbon with varying quantities of phosphorus and sulphur
D. extensively used for making cutting tools
E. extremely brittle

Cast iron has_________________?

A. high tensile strength
B. its elastic limit close to the ultimate breaking strength
C. high ductility
D. all of the above
E. none of the above

DuraJomin contains___________________?

A. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe
B. 92.5% aluminium, 40% copper, 2% nickel, and 1.5% Mg
C. 10% aluminium and 90% copper
D. 90% magnesium and 9% aluminium with some copper
E. 94% aluminium and 6% tin

Ductile cast iron___________________?

A. contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron
B. is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
C. is produced by annealing process. It is soft, tough and easily machined metal
D. 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
E. none of the above

Cyaniding is the process of________________?

A. dipping steel in cyanide bath
B. reacting steel surface with cyanide salts
C. adding carbon and nitrogen by heat treatment of steel to increase its surface hardness
D. obtaining cyanide salts
E. making corrosion resistant steel

Dow metal contains____________________?

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

In the cross compounding of the gas turbine plant__________________?

A. h.p. compressor L connected to h.p. turbine and l.p. compressor ot l.p. tur-bine
B. h.p. compressor is connected to l.p. turbine and l.p. compressor is con-nected to h.p. turbine
C. both the arrangements can be employed
D. all are connected in series
E. none of the above

In the aircraft propellers __________________?

A. the propulsive matter is caused to flow around the propelled body
B. propulsive matter is ejected from within the propelled body
C. its functioning does not depend on presence of air
D. all of the above
E. none of the above

Intercooling in gas turbine results in ____________________ ?

A. increase in net output but decrease in thermal efficiency
B. increase in thermal efficiency but decrease in net output
C. increase in both thermal efficiency and net output
D. decrease in both thermal efficiency and net output
E. none of the above