mechanical engineering MCQs – Page 53

A. cast iron steel

B. tungsten steel

D. alloy steel

E. mild steel

A. none of the above

B. high ductility

C. high tensile strength

E. all of the above

A. makes steel hard

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

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

E. improves cutting ability and reduces hardenability

A. grey cast iron, wrought iron, low carbon steel

C. wrought iron,low carbon steel, grey cast iron

D. low carbon steel, grey cast iron, wrought iron

E. wrought iron, grey cast iron, low carbon steel

A. pearlite

C. ferrite and cementite

D. ferrite and pearlite

E. anstenite

A. in a haphazard way

B. in circular motion

C. do not move

D. in a random manner

A. gun metal

B. phosphor bronze

D. fusible metal

E. solder admiralty

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

C. none of the above

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

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

B. adding copper and carbon

C. adding carbon up to 6.3%

D. adding small quantities of copper

E. adding carbon up to 2.8%

A. copper, nickel and antimony

B. iron, zinc and bismuth

C. antimony, copper and zinc

E. nickel, copper and zinc

A. forged steel

B. hot rolled steel

D. carbon-chrome steel

E. cast steel

B. extremely brittle

C. made by adding carbon in steel

D. extensively used for making cutting tools

E. refined from cast iron

A. high quantities of sulphur

B. alloying elements like chromium, tungsten nickel and copper

D. 80% or more iron

E. elements like phosphorus, sulphur and silicon in varying quantities

B. equal to 7

C. pH value has nothing to do with neutral solution

D. greater than 7

E. none of the above

B. compressive strength

C. surface finish

D. hardness

E. carbon content

A. none of the above

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

D. improvement of corrosion resistance

E. improving machinability

A. high speed steel

B. none of the above

C. all of the above

D. all non-ferrous materials

A. H.C.P.

B. B.C.C.

C. Orthorhombic crystalline structure

D. none of the above

B. 0.05 to 0.20%

C. 1.0 to 1.2%.

D. 0.55 to 1.0%

E. 0.20 to 0.45%

B. copper and iron

C. copper and chromium

D. copper and zinc

E. copper and tin

A. none of the above

B. 770C

C. 1539C

D. 1440C

A. RC 48

B. RC 80

D. RC 32

E. RC 57

A. nickel, chromium

C. nickel, zinc

D. nickel, lead

E. nickel, copper

A. mild steel

B. german silver

C. H.S.S.

E. cast iron

A. 40 : 60

B. 50:50:00

D. 0.888888889

E. 80:20:00

A. improvement of casting characteristics

B. none of the above

C. improving machinability

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

B. cementite

C. free carbon

D. flakes

E. nodular aggregates of graphite

A. refine grain structure

B. reduce segregation in casting

D. relieve internal stresses

E. improve mechanical properties

A. aluminium

B. iron

C. copper

D. zinc

A. carburised structure

C. lamellar layers of carbide distributed throughout the structure

D. relieving of stresses throughout a component

E. martenistic structure

A. 250 VPN

B. 1500 VPN

C. 2000 VPN

D. 600 VPN

A. tungsten and sulfur

B. none of the above

C. nickel and molybdenum

E. aluminium and zinc

A. orthorhombic crystal

C. cubic structure

D. hexagonal close packed

E. body centred cubic

A. 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg

B. 82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg

C. 87% Sn, 4% Cu, 8% Sb, 1% Al

D. none of the above

A. it hard

B. it brittle

D. it easily machinable

E. increases the fluidity

A. silver

C. lead

D. copper

E. aluminium

B. 1601C

C. 1489C

D. 1131C

E. 1712C

A. constantan

B. delta metal

D. monel metal

E. silicon bronze

A. sulphur

B. carbon

D. phosphorous

E. manganese

A. none of the above is true

B. a low percentage of graphite

D. a very high percentage of graphite

E. graphite as its basic constituent of composition

B. none of the above.

C. substitutional solution

D. intermetallic compounds

E. all of the above

B. above 100K

C. above 1000C

D. around 0C

E. around 100C

B. hot working

C. tempering

D. normalising

E. special heat treatment

A. 90% magnesium and 9% aluminium with some copper

B. 92.5% aluminium, 40% copper, 2% nickel, and 1.5% Mg

D. 10% aluminium and 90% copper

E. 94% aluminium and 6% tin

A. ferroelectric

B. dielectric

C. paramagnetic

D. none of the above

A. no fixed relationship

C. linear

D. unpredictable behaviour

E. plastic

B. malleable cast iron and silver

C. silver and chromium

D. 88% copper and 10% tin and rest zinc

E. 63 to 67% nickel and 30% copper

B. hexagonal close-packed lattice

C. none of the above

D. all of the above

E. body-centred cubic lattice

A. silicon

B. nickel

C. none of the above

E. manganese

A. iron, lead and tin

B. iron, nickel and copper

C. iron, aluminium and magnesium

D. copper, zinc and antimony