Manufacturing Technology I Set 8

Mechanical Engineering

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This set of Manufacturing Technology 1 Multiple Choice Questions & Answers (MCQs) focuses on Manufacturing Technology I Set 8

Q1 | For proper stretching operation, the metal sheet should be stressed above its yield strength.
  • true
  • false
Answer: true
Explaination:
in stretch forming, a metal sheet is stretched by the help of stretcher machines. for proper and complete stretching of sheet, the material is deformed plastically which is also called as permanent deformation. the metal sheet is stressed above its yield strength for successfully achieving the plastic deformation of the metal sheet.
Q2 | In stretch forming, forming limit curve (FLC) is defined as a locus of all the limit strains in different strain paths of the sheet metal.
  • true
  • false
Answer: true
Explaination:
in stretch metal forming process, the forming limit curve (flc) provides quantification about the formability of sheet metal, which basically gives the details about the quality of material. the forming limit curve (flc) is generally defined as a locus of all the limit strains in different strain paths like deep drawing and biaxial stretching, of the sheet metal.
Q3 | Which of the following processes of metal forming is best suited for making products like aircraft wings and window frames?
  • forging
  • rolling
  • drawing
  • stretch forming
Answer: stretch forming
Explaination:
stretch forming is a sheet metal forming process in which the sheet metal is clamped at the edges and stretched by using the dies or form blocks. and no any lubrication is required significantly during the process. this method is best suited for
Q4 | High volume rate of production can be possible by stretch sheet metal forming process.
  • true
  • false
Answer: false
Explaination:
in stretch forming, the sheet metal is fixed with stretch gripper with the
Q5 | Stretch forming is a process which involves tensile and bending forces during the operation.
  • true
  • false
Answer: true
Explaination:
in stretch forming process, stretching of a metal sheet is basically done by holding its edges and bending it on a cylindrical block, simultaneously is known as stretch forming. this process basically
Q6 | The stretch forming process is generally performed by using a hydraulic operated ram.
  • true
  • false
Answer: true
Explaination:
the stretch forming process is generally performed by using a hydraulic operated ram. in this process, first a single form block is used along with the gripping jaws, and then the metal is gripped and stretched by applying high tensile forces until it deforms plastically. and then the sheet metal is bent and rolled around a form block.
Q7 | Tangential stretch forming and simple stretch forming are quite similar to each other.
  • true
  • false
Answer: false
Explaination:
tangential stretch forming is very different from simple stretch forming.
Q8 | Rubber forming is a type of forming process in which polyurethane is used as a die material.
  • true
  • false
Answer: true
Explaination:
rubber forming is a type of forming process in which a polyurethane or rubber pad is commonly used as the die material instead of a rigid material. these materials are highly resistance to the abrasion and have a better fatigue life. and pressures of the order of 100 bar are typical of this process. this process is also called as guerin process.
Q9 | Forming is a process that changes the shape of the metal by changing its phase.
  • true
  • false
Answer: false
Explaination:
forming is basically a term that covers many manufacturing processes. in the metal forming process, the shape of the material or metal is changed by performing
Q10 | The metal forging operation can only be performed by manual means.
  • true
  • false
Answer: false
Explaination:
metal forging is a forming operation which usually performs hammering process to shape the metal part. in the forging process, the metal part is heated sufficiently, and then it is hammered by using a hammer which can be performed by manual means or by automation, depending on the scale of production.
Q11 | Which of the following metal forming processes performs squeezing out of material through a hole?
  • forging
  • rolling
  • drawing
  • extrusion
Answer: extrusion
Explaination:
extrusion process is a type of metal forming process, in which the material is forced or squeezed out through a hole called die. this process is very similar to squeezing out the toothpaste from the tube. this process is mainly used for metals that are ductile in nature like copper, steel,
Q12 | Metal forming is a process in which the metal is deformed plastically to get into the desired shape.
  • true
  • false
Answer: true
Explaination:
in general, the metal forming is a large set of manufacturing processes in which the metal is deformed plastically to get into the shape of the die geometry. the tools like dies and punches are mostly used in the processes for the deformation of the material. for the plastic deformation, stresses beyond the yield strength of the material is required.
Q13 | Which of the following processes is not the type of bulk forming process in the metal forming?
  • bending
  • rolling
  • forging
  • extrusion
Answer: bending
Explaination:
bulk forming is a deformation process which results in a massive shape change of the material. the ratio of surface area to volume of the material is relatively small. it includes processes like forging, extrusion and rolling. but the bending process is a part of sheet metal forming which has surface area to volume ratio relatively high.
Q14 | Which of the following manufacturing processes is mainly considered for producing the components of very high strength?
  • casting
  • forging
  • extrusion
  • rolling
Answer: forging
Explaination:
forging is a deformation process in which the material is compressed
Q15 | In metal forging process, the gravity drop hammers are operated by a ram using steam or pressurized air.
  • true
  • false
Answer: false
Explaination:
in the metal forming process, drop hammers are mainly of two types which are gravity drop hammer and power drop hammer. gravity drop hammers are the tools which achieve their energy by the falling weight of a heavy ram. the force mainly depends on the height of the drop and the weight of the ram. and power drop hammers are in which a ram is accelerated by the steam or pressurized air.
Q16 | Rolling is a forming process in which thickness of the metal plate is decreased by increasing its length.
  • true
  • false
Answer: true
Explaination:
rolling is a metal forming process in which the metal plate is squeezed between the two hard rollers. in the operation, the thickness is decreased and the length is increased as the volume of the metal is conserved. this method is mainly used for the production of thin metal plates which can be done by performing hot rolling or cold
Q17 | Which of the following metal forming processes is best suitable for making the wires?
  • forging
  • extrusion
  • drawing
  • rolling
Answer: drawing
Explaination:
drawing is a metal forming process which is widely used for making the wires from round bars of metal. this process is similar to extrusion process, except that instead of pressure on the metal mass, in drawing, the wire is pulled from one side of the metallic round bar which results into the formation of thin wires. this process is only suitable for ductile materials.
Q18 | Stretch forming is a sheet metal forming operation in which shearing is taking place to deform the material.
  • true
  • false
Answer: false
Explaination:
stretch forming is a type of sheet metal forming process in which the metallic sheet is intentionally stretched and bent simultaneously to produce different shapes of the stretched sheet metal. the metal sheet is generally held by jaws at the ends.
Q19 | In stretch forming, spring-back is a very complicated problem which causes trouble in operating machines during the process.
  • true
  • false
Answer: false
Explaination:
spring-back is basically defined as a phenomenon in which the material tries to regain its original shape during elastic loading condition. but in stretch forming process, the stretching and bending operations take place simultaneously which causes permanent deformation of the sheet metal. so, this combined effect results
Q20 | 3 WORKING PRINCIPLE AND APPLICATIONS - HYDRO FORMING - RUBBER PAD FORMING - METAL SPINNING
  • forging
  • rolling
  • drawing
  • stretch forming
Answer: stretch forming
Explaination:
stretch forming is a sheet metal forming process in which the sheet metal is clamped at the edges and stretched by using the dies or form blocks. and no any lubrication is required significantly during the process. this method is best suited for
Q21 | The magnetic field interacts with metal to generate heat in the metal which causes forming process.
  • true
  • false
Answer: false
Explaination:
in the electromagnetic forming process, eddy currents are induced in a conductive material that is placed near to the coil. then it interacts with a magnetic field to cause mutual repulsion between the metal and the forming coil. this force of repulsion is mainly responsible for inducing stresses in
Q22 | Metal used for electroforming process absorbs energy from the magnetic field to get deform.
  • true
  • false
Answer: true
Explaination:
in the electromagnetic forming process, the conductivity of the metal and the eddy currents which makes contact with magnetic field creates a net pressure on the surface of the metal. then the metal surface moves inward due to the effect of this pressure, this mainly occurs due to the transfer of energy from the magnetic field to the metal.
Q23 | In the electromagnetic forming process, the forming pulse is kept longer to optimize the use of energy.
  • true
  • false
Answer: false
Explaination:
in the electromagnetic forming process, the metal absorbs energy from the magnetic field to get deformed. to utilize most of this energy to forming operation, and to reduce the energy loss due to resistance heating, the forming pulse is kept short for better optimization of energy produced by the magnetic field. in general, pulse has duration of between 10 and 100 second.
Q24 | Which of the following methods of forming is not the part of electromagnetic forming?
  • compression
  • expansion
  • shearing
  • counter forming
Answer: shearing
Explaination:
in the electromagnetic forming process, electromagnetic formation mainly used for three forming methods which can be compression, expansion, and counter forming. for compression, a tubular metal is compressed by a coil, usually against a grooved tube. and shearing is a different
Q25 | The process of electromagnetic forming does not require any kind of lubrication.
  • true
  • false
Answer: true
Explaination:
in most of the forming processes, tool contacts with the specimen to get the desired output. but in the case of electromagnetic forming, the magnetic field is used to apply the pressure on the surface of a metal, which normally does not require any kind of lubrication. and it leaves no any tool marks on the metal surface.
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