mechanical engineering MCQs – Page 55

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

A. nickel

C. vanadium

D. iron

E. carbon

A. near melting point

B. room temperature

C. between 1400C and 1539C

D. none of the above

A. silver

B. zinc

C. brass

D. lead

A. cast iron

B. low carbon steel

D. aluminium

E. high carbon steel

A. below 1%

B. below 0.5%

D. nil

E. above 2.2%

A. increasing hardness throughout

C. heating and cooling rapidly

D. hardening core

E. inducing hardness by continuous process

A. dipping steel in cyanide bath

B. reacting steel surface with cyanide salts

D. making corrosion resistant steel

E. obtaining cyanide salts

A. ductile

B. malleable

C. hard

D. tough

A. all of the above

B. aluminium, copper etc

C. none of the above

E. nickel, copper, etc

A. a iron (below 910C and between 1400 to 1539C), W

B. all of the above

D. Mg, Zn, Ti, Zr, Br, Cd

E. none of the above

A. 15-22

B. 15-Oct

D. 10-Jul

E. 5-Mar

A. manganese

C. cobalt

D. carbon

E. copper

A. 92.5% aluminium and, 4% copper, 2% nickel and 1.5% Mg

B. 90% magnesium and 10% tin

D. 90% aluminium and 90% copper

E. 94% aluminium, 4% copper and 0.5% Mn, Mg, Si and Fe

A. 1052

B. 1010

C. TO16

E. 1040

A. 1.5 to 2.5%.

B. 0.6 to 0.8%

C. 0.1 to 0.3%

E. 0.3 to 0.6%

B. which have poor properties due to improper manufacturing

C. which after their destruction are recycled to produce fresh steel

D. in which carbon is completely burnt

E. which are destroyed by burning

A. 1% phosphorous

C. 0.5% of phosphorous

D. 2.5% phosphorous

E. 5% phosphorous

A. all of the above

B. interstitial solid solution

C. intermetallic compounds

D. none of the above

B. high ductility

C. easily weldable characteristics

D. high resistance to rusting and corrosion

E. ability of hold protective coating

B. cyaniding

C. flame hardening

D. nitriding

E. induction hardening

B. silver, copper, aluminium

C. silver, tin, nickel

D. silver, lead, zinc

E. silver, lead, tin

A. shot peening

B. nitriding of surface

C. cold working

D. under-stressing

A. in direction perpendicular to application of load

B. by crushing into thousands of pieces

D. none of the above

A. malleable iron

B. pig iron

C. wrought iron

E. white iron

A. none of the above

C. improves wear resistance, cuttinability and toughness

D. gives ductility, toughness, tensile strength and anti corrosion property:

E. refines grain size and produces les tendency to carburisation, improve corrosion and heat resistant proper ties

A. ability to undergo large permanent deformations in compression

C. none of the above

D. all of the above

E. ability to recover its original form

A. cast iron

B. aluminium

C. brass

D. non-ferrous alloys.

B. 0.30%

C. 1.2%.

D. 0.02%

E. 0.63%

A. soft

B. ductile

D. malleable

E. tough

A. none of the above

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

C. alloy of tin, lead and cadmium

D. malleable iron and zinc

A. improvement of casting characteristics

C. none of the above

D. improving machinability

E. improvement of corrosion resistance

A. at which crystals first start forming from molten metal when it is cooled

B. at which change of allotropic form takes place

D. at which crystals are destroyed on heating

E. at which crystals grow bigger in size

A. flywheel of steam engine

C. cast iron pipes

D. piston I.C. engine

E. cycle chains

A. alloy of tin, lead and cadmium

B. 63 to 67% nickel and 30% copper

C. none of the above

E. iron scrap and zinc

A. silver and gold

C. nickel and copper

D. refined silver

E. silver and some impurities

A. the quality of ore from which it is made

B. contents of alloying elements

C. method of fabrication

D. amount of carbon it contains

A. stainless steel

C. high carbon steel

D. mild steel

E. cast iron

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

C. 70% copper and 30% zinc

D. 70-75% copper and rest zinc and tin

E. 90% copper and 10% tin

A. lead and copper

C. tin and lead

D. tin, antimony, copper

E. lead and zinc

B. 1.25%

C. 0.80%

D. 0.26%

E. 0.03%

A. 50:50:00

B. 60:40:00

C. 90:10:00

D. 40 : 60

A. longitudinal stress and lateral strain

C. shear stress to shear strain

D. lateral stress and lateral strain

E. volumetric stress and volumetric strain

B. It is more sensitive to changes in both metallurgical and mechanical conditions

C. It gives, a more accurate picture of the ductility

D. It can be correlated with stress-strain values in other tests like torsion, impact, combined stress tests etc.

E. It can be used for compression tests as well.

B. be all parallel

C. meet in a point

D. none of the above

E. at least two of them must meet

A. double riveted lap joints

C. none of the above

D. lap joint

E. all types of joints