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PPSC Chemistry Part VI Applied/Industrial Chemistry Online Test
| Sr. # | Questions | Answers Choice |
|---|---|---|
| 1 | The alpha iron will become paramagnetic at
temperature above |
770 C 550 C 660 C 440 C |
| 2 | What is the equilibrium temperature of transformation of austenite to pearlite | 1000 F 1333 F 166 6 F 1222 F |
| 3 | What refer by the ability of steel to be hardened
through to its centre in large section? |
<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Malleability<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Hardenability<b><o:p></o:p></b></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Ductility<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Rigidity<o:p></o:p></p> |
| 4 | What refers to the application of any process whereby
the surface of steel is altered so that it will become hard. |
<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Caburizing<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Case harden zing<b><o:p></o:p></b></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Ammealing<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Surface hardening<o:p></o:p></p> |
| 5 | The special chrome steels of the stainless variety
contain how many percent of chromium. |
<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">4 to 8<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">11 to 17<b><o:p></o:p></b></p> 9 tp 10 12 to 15 |
| 6 | The wear-resistance of the material is attributed to
its ability on ________ that is the hardness is increased greatly when the steel
is cold worked. |
<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Cold harden<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Stress harden<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Strain harden<b><o:p></o:p></b></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Cool temperature<o:p></o:p></p> |
| 7 | What cast iron has modular or spheroidal graphite? |
<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Ductile iron<b><o:p></o:p></b></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Gray iron<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">White iron<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Raw iron<o:p></o:p></p> |
| 8 | Which of the following is NOT a hardware requirement
for die casting. |
<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Water cooled metal cavities<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Machined metal holding blocks<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Ejection mechanism<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Metal mold<b><o:p></o:p></b></p> |
| 9 | What refers to a shape achieved by allowing a liquid
to solidify in a mold. |
<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Casting<b><o:p></o:p></b></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Molding<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Forming<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">All of the choices<o:p></o:p></p> |
| 10 | The electrical resistance of stainless steels can be
as much as______ time that of carbon steel. |
5 6 10- 15 |
| 11 | Indicate false statement about stainless steel | <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">The density of stainless steel is about the same as carbon or low alloy steels<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Stainless steels are poor conductors of heat<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Stainless steels are poor conductors of electricity<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal;tab-stops:395.7pt">Stainless steels have tensile moduli greater than those of carbon and alloy steels. <b><o:p></o:p></b></p> |
| 12 | Steel is an alloy of iron and carbon with limits on the amount of
carbon to less than _______ percent. |
2 3 1 4 |
| 13 | Indicate the false statement about corrosion. |
<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Plastics and ceramics are immune to many forms of corrosion because they are not good conduction of electricity.<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">The corroded member in a corrosion cell is the cathode<b><o:p></o:p></b></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Passivity is a prerequisite for the corrosion protect on many metals<o:p></o:p></p> None of these |
| 14 | What refers to the deterioration of material by oscillatory relative
motion of small amplitude between two solid surfaces in a corrosive
environment? |
<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Stray current corrosion<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Microbiologicla corrosion<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Fretting corrosion<b><o:p></o:p></b></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">None of these<o:p></o:p></p> |
| 15 | What corrosion occurs under organic coating on metals as fine wavy
hairlines? |
<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Stray current corrosion<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Microbiological corrosion<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Filiform corrosion<b><o:p></o:p></b></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Simple corrosion<o:p></o:p></p> |
| 16 | What is the scaling off of a surface in flakes or layers as the result
of corrosion? |
<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Expoliation<b><o:p></o:p></b></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Corrosion fatigue<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Scaping<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Fretting<o:p></o:p></p> |
| 17 | What refers to the removal of zinc from brasses? |
<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Dezincification<b><o:p></o:p></b></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Graphitization<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Stabilization<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Denitration<o:p></o:p></p> |
| 18 | What is defined as a local corrosion damaged characterized by surface
cavities. |
<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Cracking<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Pitting<b><o:p></o:p></b></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Cavitation<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Corrosion<o:p></o:p></p> |
| 19 | What is a process of producing a hard surface in a steel having a
sufficiently high carbon content to respond to hardening by a rapid cooling of
the surface? |
<p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Cyaniding<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Nitriding<o:p></o:p></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Flame hardening<b><o:p></o:p></b></p> <p class="MsoNormal" style="margin-bottom:0in;margin-bottom:.0001pt;line-height: normal">Stability<o:p></o:p></p> |
| 20 | What impurity in steel can cause ted shortness which means the steel
becomes unworkable at high temperature. |
Sulphur Silicon Magnesium Aluminium |
