1) Foundry crucible is made of_________________? a. mild steel b. german silver c. lead d. cast iron e. graphite
|
||||
2) 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 e. 10% aluminium and 90% tin
|
||||
3) 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 e. none of the above
|
||||
4) 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 e. none of the above
|
||||
5) 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 e. none of the above
|
||||
6) Recrystallisation temperature can belowered by_________________? a. purification of metal b. grain refinement c. working at lower temperature d. all of the above e. none of the above
|
||||
7) Austenite rs a combination of_________________? a. ferrite and cementite b. cementite and gamma iron c. ferrite and austenite d. ferrite and iron graphite e. pearlite and ferrite
|
||||
8) Lead is poured into the joint between two pipes. These pipes may be made of____________________? a. cast iron b. vitrified clay c. asbestos cement d. concrete e. mild steel
|
||||
9) Pearlite is a combination of___________________? a. ferrite and cementite b. cementite and gamma iron c. ferrite and austenite d. ferrite and iron graphite e. pearlite and ferrite
|
||||
10) The transistor is made of___________________? a. silver b. gold c. copper d. germanium e. german silver
|
||||
11) Following elements have face-centred cubic structure__________________? a. gamma iron (910° to 1400°C), Cu, Ag, Au, Al, Ni, Pb, Pt b. Mg, Zn, Ti, Zr, Br, Cd c. a iron (below 910°C and between 1400 to 1539°C), W d. all of the above e. none of the above
|
||||
12) Acidic 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 e. none of the above
|
||||
13) Babbit metal is a_________________? a. lead base alloy b. tin base alloy c. copper base alloy d. all of the above e. A. and C. above
|
||||
14) Age-hardening is related with______________? a. stainless steel b. gun metal c. german silver d. duralumin e. cast iron
|
||||
15) 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
|
||||
16) German silver contains_________________? a. 1% silver b. 2.5% silver c. 5% silver d. 10% silver e. 100% silver
|
||||
17) Constantant an alloy used in thermocouples is an alloy of __________________? a. copper and tin b. copper and zinc c. copper and iron d. copper and nickel e. copper and chromium
|
||||
18) Addition of lead and bismuth 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 e. none of the above
|
||||
19) Elinvar, an alloy used in precision instruments, hair springs for watches, etc. contains the following element as principal alloying element__________________? a. iron b. copper c. aluminium d. zinc e. nickel
|
||||
20) Addition of copper 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 e. none of the above
|