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1. Thisset of Basic MaterialsScience QuestionsandAnswersfocuseson“ContinuousCooling
TransformationDiagrams”.
1. Continuouscoolingtransformationdiagramsare mainlydrawnfor_________
a) Iron
b) Manganese
c) Anyalloy
d) steel
ViewAnswer
Answer:d
Explanation:Continuouscoolingtransformationdiagramsare drawnformainlysteelsandsteel of
constantcompositionata time istaken.
2. In continuouscoolingtransformationdiagrams,whichof the followingistrue?
a) The material iscooled rapidly
b) The material isfirstheatedandthencooledrapidly
c) The material iscooledat a certainrate
d) The material iskeptat a constanttemperature
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Answer:c
Explanation:Inacontinuouscoolingtransformationdiagrams,the material iscooledata certainrate
insteadof heatingandthencoolingitrapidlyandthenmaintainingaconstanttemperature incase of
TTT diagrams.
3. How many typesof CCT diagramare there?
a) 1
b) 2
c) 3
d) 4
ViewAnswer
Answer:b

2. Explanation:There are twotypesof continuouscoolingtransformationdiagramswhichcanbe
drawn.In the two type,some factorsare changedto obtaina differentcurve.
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4. Which physical propertyisnormallymeasuredtodetermine aCCTdiagram?
a) Hardness
b) Magnetic permeability
c) Pressure
d) Ductility
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Answer:b
Explanation:CCTdiagramsare determinedbymeasuringmagneticpermeabilityandspecificvolume
duringcontinuouscooling.
5. Slope change ina CCT diagramsignify_________
a) Change in temperature
b) Change in pressure
c) Change inphase
d) Change in state
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Answer:c
Explanation:Whenthere isaslope change observedinacontinuouscoolingtransformationdiagram,
it signifiesthatthere isachange in phase occurringat that point.
6. Jominyendquenchtestisusedfortype 2 CCT diagram.
a) True
b) False
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Answer:b
Explanation:The above statementisfalse.Jominyendquenchtestapartfromits use infindingout
hardenabilityof amaterial,itisalsousedfor plottingtype 1CCT diagram.

3. 7. Which of the followingscientistgave amethodto calculate the transformationtemperature
duringcontinuouscooling?
a) Scheil’s
b) Newton
c) Jominy
d) Einstein
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Answer:a
Explanation:Scheilgave amethodwhichcanbe usedtocalculate the transformationtemperature of
a material duringcontinuouscoolingof the material.The conceptiscalledScheil’sconceptof
fractional nucleation.
8. Critical coolingrate requiredislessinCCTthan in TTT diagrams.
a) True
b) False
ViewAnswer
Answer:a
Explanation:The above statementistrue.Ina continuouscoolingtransformationdiagrams,the
critical coolingrate islessthanthat prescribedinTTT diagrams.