Manufacturing Technology I Set 2

Mechanical Engineering

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This set of Manufacturing Technology 1 Multiple Choice Questions & Answers (MCQs) focuses on Manufacturing Technology I Set 2

Q1 | Why are flux added to the charge ( parent metal to be melted) during melting of a metal?
  • to increase carbon content
  • to increase refractoriness
  • to add specific oxides
  • to remove specific oxides
Answer: to remove specific oxides
Explaination:
the flux is a chemical substance, added to the metal while melting it to remove oxides present in the metal.
Q2 | Which of the following is/are the advantage(s) of an Induction Furnace?
  • higher yield
  • cleaner melting
  • compact installation
  • all of the mentioned
Answer: all of the mentioned
Explaination:
advantages offered by induction furnace are higher yield, faster startup, cleaner melting, natural stirring and compact installation.
Q3 | Which of the following metal has a melting point of about 420oC and latent heat of fusion 26.3 cal/g?
  • nickel
  • copper
  • zinc
  • iron
Answer: zinc
Explaination:
zinc is the metal having a melting point of about 420oc and latent heat of fusion of 26.3 cal/g. it has a mean specific heat of 0.101 cal/goc and heat required for melting 1 kg of zinc is 285 kj.
Q4 | Which of the following metal has a melting point of about 660oC and latent heat of fusion 92.7 cal/g?
  • aluminium
  • lead
  • magnesium
  • tin
Answer: aluminium
Explaination:
iron is the metal having a melting point of about 660oc and latent heat of fusion of 92.7 cal/g. it has a mean specific heat of 0.237 cal/goc and heat required for melting 1 kg of iron is 1022 kj.
Q5 | Gas-Fired burner is used in which of the following furnace?
  • induction furnace
  • reverberatory furnace
  • cupola furnace
  • crucible furnace
Answer: reverberatory furnace
Explaination:
reverberatory furnace use gas- fired burner, located higher in the furnace transferring heat by radiation to the wall and roof.
Q6 | What is inoculation of cast iron?
  • addition of sulphur alloys
  • addition of silicon alloys
  • addition of oxides
  • addition of parent metal’s ore
Answer: addition of silicon alloys
Explaination:
inoculation of cast iron is the addition of certain silicon alloys to molten iron to produce changes in graphite distribution.
Q7 | Why is inoculation done certain times during melting of cast iron?
  • to enhance its mechanical properties
  • to reduce the liquid shrinkage of metal
  • to enhance the surface finishing
  • all of the mentioned
Answer: to enhance its mechanical properties
Explaination:
a certain amount of silicon alloys are added to the molten metal to
Q8 | Which of the following is/are not used to melt material in casting(foundry) industries?
  • cupola furnace
  • induction furnace
  • ladle furnace
  • crucible furnace
Answer: ladle furnace
Explaination:
all of listed are the furnaces used by metal foundry industries to melt down metal for casting purposes, except ladle furnace.
Q9 | Which type of sand is used in shell moulding?
  • black sand
  • wet and fine sand
  • dry and fine sand
  • any of the sand
Answer: dry and fine sand
Explaination:
dry and fine sans is used in shell moulding. it is completely free if clay (90-140 gfn).
Q10 | Which is the most widely used resin in shell moulding?
  • phenol formaldehyde
  • ethanol formaldehyde
  • phenol
  • ethanol
Answer: phenol formaldehyde
Explaination:
phenol formaldehyde is used as resin in shell moulding. it acts like a thermoplastic material.
Q11 | Which of the following statement is true?
  • the size of the casting can be adjustable
  • the size of the casting is not limited
  • the size of the casting obtained by shell moulding is limited
  • none of the mentioned
Answer: the size of the casting obtained by shell moulding is limited
Explaination:
the size of the casting is limited and is usually up to 200kg.
Q12 | Cylinder and cylinder heads for air cooled IC engines are casted using which technique?
  • precision investment casting
  • shell moulding
  • permanent mould casting
  • die casting
Answer: shell moulding
Explaination:
cylinders, cylinder head, automation parts, cast tooth etc are casted using shell moulding.
Q13 | In precision investment casting, to make the mould the prepared pattern is dipped into a slurry. From which material is this slurry is made up of?
  • ethyl silicate
  • sodium silicate
  • both ethyl and sodium silicate
  • neither ethyl nor sodium silicate
Answer: both ethyl and sodium silicate
Explaination:
the slurry in which prepared pattern is dipped into is made by suspending fine ceramic particles in ethyl silicate or sodium silicate.
Q14 | Another name of Gravity Die Casting is?
  • centrifugal casting
  • permanent mould casting
  • precision investment casting
  • hot chamber process
Answer: permanent mould casting
Explaination:
since, metal enters the mould under gravity, hence permanent, mould casting is also known as gravity die casting.
Q15 | In PIC, any wax remnants are dissolved with the help of hot vapors of a solvent. Which solvent is used for this purpose?
  • ethanol
  • chlorofluorocarbon
  • trichloroethylene
  • any of the above
Answer: trichloroethylene
Explaination:
before preheating of the prepared mould, any of the wax remnants are dissolved with the help of a solvent such as trichloroethylene.
Q16 | Which of the following is a limitation of die casting, but is overcome in vacuum die casting?
  • the air left in the cavity when the die is closed
  • the moisture left in the cavity when the die is closed
  • the air left in the cavity when the die is open
  • the moisture left in the cavity when the die is open
Answer: the air left in the cavity when the die is closed
Explaination:
in die casting the major problem is the air left inside the cavity when the die is closed, but in the case of vacuum die casting this air is evacuated out.
Q17 | Pattern used in shell moulding is normally made up of?
  • wax
  • metal
  • wood
  • plastic
Answer: metal
Explaination:
metal is the most used material to make patterns for a process of shell moulding.
Q18 | The casting process that does not require a core to produce a hollow casting is?
  • shell moulding
  • hot-chamber die casting
  • permanent mould casting
  • true centrifugal casting
Answer: permanent mould casting
Explaination:
permanent mould casting is the only process that does not require cores to be used for hollow projections.
Q19 | Squeeze casting method was developed in which country?
  • japan
  • india
  • america
  • russia
Answer: russia
Explaination:
russia was the country in which squeeze casting was first developed.
Q20 | The tundish is a                
  • pouring vessel
  • riser
  • type of core
  • machine name
Answer: pouring vessel
Explaination:
tundish is a refractory lined intermediate pouring vessel.
Q21 | Which of the type of centrifugal casting methods is used to produce ‘non- symmetrical’ shaped castings?
  • true centrifugal casting
  • semi centrifugal casting
  • centrifuging
  • non centrifugal casting
Answer: centrifuging
Explaination:
more than a single object is connected radially through a central sprue in centrifuging. but the castings need not be symmetrical always, unlike other centrifugal casting processes.
Q22 | True centrifugal casting method is usually used to make                      
  • bent pipes
  • hollow pipes
  • bolts
  • nuts
Answer: hollow pipes
Explaination:
true centrifugal casting method is usually used to make ‘hollow pipes and tubes’.
Q23 | Which of the following forces provides continuous pressure on the metal in centrifugal casting?
  • spring force
  • centrifugal force
  • gravitational force
  • frictional force
Answer: centrifugal force
Explaination:
in centrifugal casting, mould is rotated rapidly about its central axis as the metal is poured into it. because of the centrifugal force, continuous pressure is applied to the metal as it solidifies. the slag and the other inclusions being lighter gets separated from the metal and segregates toward the centre.
Q24 | Which of the following methods of casting is best suited for casting of hollow pipes and tubes?
  • investment casting
  • permanent mould casting
  • die casting
  • centrifugal casting
Answer: centrifugal casting
Explaination:
specifically, true centrifugal casting is generally used for the making of hollow pipes and tubes, which are axi- symmetric with a concentric hole. molten metal is accumulated at the inward surface of the mould by the rotation of the mould and then the solidification of a melt is taking place.
Q25 | 5 CENTRIFUGAL CASTING
  • true
  • false
Answer: false
Explaination:
in centrifugal casting, there is no requirement of any core for the making of the concentric hole. as the metal is always pushed outward because of the centrifugal force, application of core is eliminated. only the oxides and slag part separate from the metal and segregate at the centre.
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