Manufacturing Technology I Set 1

Mechanical Engineering

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

Q1 | A pattern is generally made up of how many pieces?
  • 1
  • 2-3
  • 4-5
  • 6
Answer: 2-3
Explaination:
a pattern is basically a duplicate of the object that we intend to cast. patterns can be made up of wood, plastics or metals. a pattern is generally made up of two or three pieces, whereas it is casting which is in one piece.
Q2 | How does pattern vary in size with casting?
  • pattern is larger in size
  • casting is larger in size
  • both have same size
  • size depends on other factors
Answer: pattern is larger in size
Explaination:
patterns are duplicates of the objects we desire to cast. these patterns can be made up of plastics, metals or wood. a pattern is slightly larger in size as compared to casting because a pattern carries various allowances and the core prints.
Q3 | A pattern carries which allowance for internal and external surfaces?
  • shrinkage allowance
  • machining allowance
  • distortion allowance
  • draft allowance
Answer: draft allowance
Explaination:
draft allowance is also known by the name of tapering allowance, as the diameter of the cast goes on increasing in a trapezoidal shape from the bottom. a pattern has a draft allowance of an order of 1 and 3 degrees for external and internal surfaces respectively.
Q4 | What is draft allowance also known as?
  • shake allowance
  • contraction allowance
  • taper allowance
  • rapping allowance
Answer: taper allowance
Explaination:
none.
Q5 | Machining allowance does not depend on which of the following factor?
  • solidifying contraction
  • machining method
  • shape and size of casting
  • casting method
Answer: solidifying contraction
Explaination:
machining allowance does not depend on solidifying contraction as it is one of the form of shrinkage allowance. but,
Q6 | How much does the distortion allowance vary?
  • 1mm to 10mm
  • 2mm to 20mm
  • 1mm to 15mm
  • 2mm to 15mm
Answer: 2mm to 20mm
Explaination:
in distortion allowance, the amount goes on to vary from 2mm to 20mm. this allowance depends on the shape of the casting that is being used. it also depends on the size of the cast and the material that is being employed for the casting.
Q7 | Ferrous metals need more allowance than non-ferrous metals.
  • true
  • false
Answer: true
Explaination:
ferrous metals have dimensions on casting which have a larger size to provide stock than the dimensions of the casting of the non-ferrous metals.
Q8 | A pattern is shaken by striking it with a wooden piece. A negative allowance is provided for this. Which allowance is it?
  • machining allowance
  • rapping allowance
  • distortion allowance
  • contraction allowance
Answer: rapping allowance
Explaination:
in rapping or shake allowance, the pattern is taken out of the mould and it is rapped or shaken, so as to free it from the adjoining sand. due to this, there may be a little increase in the size of the mould cavity.
Q9 | The following figure depicts which allowance?
  • machining allowance
  • shrinkage allowance
  • draft allowance
  • shake allowance
Answer: draft allowance
Explaination:
the pattern is being taken out of the mould without the mould cavity getting damaged. the pattern is having a tapered shape, that is, it has a tapering allowance.
Q10 | Which of the following is not used for the formation of the molding sand?
  • silica sand
  • binders
  • additives
  • coal
Answer: coal
Explaination:
the coal is a material which is not used in the formation of the molding sand as the particle size of the coal is high and there are chances that it will react with the possible gases that are produced during the pouring of the metal and result in casting defects.
Q11 | The size of the sand particles in the molding sand is the biggest.
  • true
  • false
Answer: true
Explaination:
the molding sand is made up of several particles. the properties such as porosity, texture are all considered while
Q12 | The is responsible for the impact strength in the molding sand.
  • aggregates
  • refractoriness
  • impurities
  • permeability
Answer: aggregates
Explaination:
in a foundry, the molding sand
Q13 | Molding sand can withstand chemical reactions on it and prove it to be beneficial for the casting formation.
  • true
  • false
Answer: false
Explaination:
molding sand is added with chemicals to enhance properties such as permeability, compressive strength etc., however, the chemical reactions happening is not viable for the formation of the casting as it might cause explosion or severe fatal effects in the casting.
Q14 | The property ensures the removal of excess sand in the mould box.
  • adhesiveness
  • cohesiveness
  • green strength
  • compressive strength
Answer: adhesiveness
Explaination:
the adhesiveness is a property of molding sand to get the stick or adhere to foreign material such as sticking of molding sand with an inner wall of the molding box. hence, as the sand sticks to the box and the excess sand is removed.
Q15 | Binding property of the sand increases because of the property.
  • cohesiveness
  • collapsibility
  • flow ability
  • permeability
Answer: cohesiveness
Explaination:
the cohesiveness is a property of molding sand by virtue which the sand grain particles interact and attract each other
Q16 | Which of the following is the most important property of the molding sand in cores?
  • dry strength
  • green strength
  • collapsibility
  • cohesiveness
Answer: collapsibility
Explaination:
after the molten metal in the mould gets solidified, the sand mould must be collapsible so that free contraction of the metal occurs and this would naturally avoid the tearing or cracking of the contracting metal. in absence of collapsibility property, the contraction of the metal is hindered by the mold and thus results in tears and cracks in
Q17 | The adhesiveness and cohesiveness are the same properties of the molding sand.
  • true
  • false
Answer: false
Explaination:
the adhesive property refers to the sticking of the sand particles to each other so that they can take up the desired shape.
Q18 | Flow ability increases with increase in the green strength.
  • true
  • false
Answer: true
Explaination:
flowability or plasticity is the ability of the sand to get compacted and behave like a fluid. it will flow uniformly to
Q19 | For melting of cast iron, which of the following furnace is used?
  • rotary furnace
  • cupola furnace
  • pit furnace
  • electric furnace
Answer: cupola furnace
Explaination:
cupola is a heavy furnace and has the capability to melt down heavy metals like cast iron. hence, the cupola furnace is mostly used to melt cast iron for casting purposes.
Q20 | Why is sand bed prepared for melting of metal in Cupola furnace?
  • it provides a refractory bottom
  • it soaks the moisture from the metal
  • it conducts the heat faster and uniformly
  • none of the mentioned
Answer: it provides a refractory bottom
Explaination:
a sand bed needs to be prepared because it provides a necessary refractory bottom for molten metal and coke.
Q21 | What is the function of slag hole in a cupola furnace?
  • to tap the slag generated
  • to generate the slag
  • to allow outflow of gases
  • all of the mentioned
Answer: to tap the slag generated
Explaination:
slag hole is a tapping hole in a
Q22 | Incoming air pressure and quantity in cupola furnace are controlled by which of the following element?
  • tuyeres
  • tapping spout
  • wind box
  • blast pipe
Answer: wind box
Explaination:
the air enters the cupola through the tuyers. but the air blowers in the wind box controls the requisite pressure and quantity of air coming inside.
Q23 | Which of the following chemical compound, is the most common flux added to the charge in a cupola furnace?
  • coke
  • methane
  • carbon dioxide
  • limestone
Answer: limestone
Explaination:
limestone (caco3) is used as flux in cupola furnace in a proportion of about 2-4% of the metal charge.
Q24 | Which of the following metal has a melting point of about 1537oC and latent heat of fusion 65.0 cal/g?
  • nickel
  • copper
  • zinc
  • iron
Answer: iron
Explaination:
iron is the metal having a melting point of about 1537oc and latent heat of fusion of 65.0 cal/g. it has a mean specific heat of 0.141 cal/g-oc and heat required for melting 1 kg of iron is 1168 kj.
Q25 | What is hearth in a furnace?
  • the electrodes are often called hearth
  • the walls of the furnace
  • the bowl shaped bottom of the furnace
  • the dome shaped roof of the furnace
Answer: the bowl shaped bottom of the furnace
Explaination:
the hearth is that bowl shaped bottom of the furnace. it is made up of a high refractory material (bricked and granular).
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