Manufacturing Industrial Engineer Interview Questions with Answers
Question: 1. What Is The Important Characteristics Of Plastics?
Answer:
It may be molded into completed product via application of warmth and pressure.
Question: 2. What Are The Advantages Of Plastics Over Metals?
Answer:
Low weight
Corrosion resistance
Insulation homes
Electrical residences
Cheaper
Easy to handle
Surface residences
Reusable
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Question: 3. Explain The Disadvantages Of Plastics?
Answer:
Low electricity
Low warmness resistance
Poor mechanical houses
Difficulty to repair
Question: 4. How To Classify The Plastics?
Answer:
Natural : milk of rubber tree, cellulose
Semi artificial
Synthetic
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Question: five. Types Of Plastics Based On Chemical Behavior?
Answer:
Thermo plastics
Thermosetting plastics
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Question: 6. Difference Between Thermo Set And Thermo Plastics?
Answer:
Thermoplastics:
Can be re softened and reused
No chemical adjustments during heating.
In granular form
Needle structure
Hard but no longer brittle
Thermo set plastics:
Cannot be re softened and reused
Chemical modifications at some point of heating and many others.
In powder shape
Cross linked shape
Hard and brittle
Question: 7. Give Example Of Thermoplastics?
Answer:
ABS, PP, CA, PMMA, PS, PC, POM and so on.
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Question: eight. Perspex Is The Trade Name Of ?
Answer:
CA
Question: 9. Nylon Is The Trade Name Of ?
Answer:
PA
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Question: 10. Delrin Is The Trade Name Of?
Answer:
POM
Question: 11. Teflon Is The Trade Name Of ?
Answer:
PTFE
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Question: 12. What Is Mfi?
Answer:
Flow capability of different grades of thermoplastics are inversely proportional to molecular weight.
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Question: 13. About Abs?
Answer:
Shrinkage zero.Five%. It is warmth resistant, provides correct insulation and show off electric houses. Examples are widespread reason safety helmets, pipe fittings, television, radio and so forth.
Question: 14. About Ca ?
Answer:
Shrinkage 0.3-0.Eight%. Its most important properties are transparency and floor texture. Examples are Tool take care of, goggles, TV monitors.
Question: 15. About Hdpe?
Answer:
Shrinkage 3-four%. Main features of HDFE are excessive density, pressure, strength, hardness and chemical resistance. Examples are milk bottle crates, fish containers etc.
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Question: sixteen. About Ldpe?
Answer:
Shrinkage 0.Eight-1.Five%. It is crystalline and no longer to be had in transparent shape. Examples are shopping baskets, waste baskets and so forth.
Question: 17. About Pa?
Answer:
Shrinkage zero.7-1.Five%. It is tough and excessive inflexible. Examples are mild obligation gears, sprockets, bearings and so on.
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Question: 18. About Pc?
Answer:
Shrinkage 0.5-0.7%. It is known optical transparency, stress and toughness. Examples are goggles, lenses, safety helmets and so forth.
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Question: 19. About Pp?
Answer:
Shrinkage 1-three%. It is flammable and degradable in solar light and solid. Examples are air cleaner, garden fixtures and so forth.
Question: 20. About Ps?
Answer:
Shrinkage zero.2-0.8%. It is apparent, brittle and it can be easily molded. Examples are toys, residence hold appliances, digital housings etc.
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Question: 21. About Pvc?
Answer:
Shrinkage (FLEXI 1.Five-3%,RIGID zero.2-zero.Four%). It is inflexible and no longer very difficult and very low cost. Example – Pipes fittings.
Question: 22. Examples For Thermosetting Materials ?
Answer:
Alkyds, epoxies, pf, mf, urea, polyester
Question: 23. What Is Fillers And Additives?
Answer:
Adding of small molecules to plastics to get some traits (coloration, flexibility and so on.). Fillers are normally used with thermosetting plastics. Additives are of kinds,
Physical means which includes plasticizer
Chemical approach— stabilizer.
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Question: 24. What Are The Mold Release Agents?
Answer:
External with mould floor e.G. Polyvinyl alcohol
Internal with resins eg. Silicon oil
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Question: 25. What Are The Types Of Injection Molding Machines?
Answer:
Plunger injection cylinder
Two degree plunger injection cylinder
Pre plasticizer two stage screw injection cylinder
Reciprocating screw injection cylinder
Question: 26. What Are The Divided Sections Of Screw Of Injection Molding Machines ?
Answer:
Feed zone
Compression quarter
Melting area
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Question: 27. What Do You Meant By Nozzle ?
Answer:
Nozzle linked to the quit of the barrel through which melt substances inserted within the mold.
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Question: 28. What Are The Types Of Nozzle ?
Answer:
Reverse taper (melt valve)- for PA, ABS and so on.
Removable tip
Standard of general cause
Question: 29. Define Drooling ?
Answer:
Leakage of plastic material through the nozzle in between photographs.
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Question: 30. What Is Injection Capacity Or Short Capacity?
Answer:
Maximum extent material injected by the screw throughout one cycle of operation.
Question: 31. What Is Plasticizing Capacity ?
Answer:
It is the amount of fabric that can be processed by means of the gadget in line with hour. It is expressed in kg/h.
Question: 32. What Is Injection Pressure?
Answer:
It is the most stress by means of which the cloth is injected via the nozzle. It is given in kg/cm2.
Question: 33. What Is Injection Rate Or Injection Velocity ?
Answer:
It is the most charge at which the screw can inject or shoot substances from the barrel at some stage in one shot.
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Question: 34. What Do You Meant By Clamping Force?
Answer:
It is the maximum pressure that the clamping gadget can exert on the mildew or it is the most pressure via which the mold halves can be closed collectively. It is given in ton or kilo Newton.
Question: 35. What Is Maximum Daylight?
Answer:
It is the most distance that the device platen can be separated from each different and it is able to be acquired by adding the maximum mildew thickness to the most commencing stroke.
Question: 36. What Is A Mold ?
Answer:
It is a custom construct device in which we converts plastic uncooked cloth into finished product.
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Question: 37. What Are The Main Elements Of Mold ?
Answer:
The predominant parts of molds are center and cavity.
Question: 38. What Are The General Types Of Mold ?
Answer:
Injection molds, compression molds, transfer molds.
Question: 39. What Are The Types Of Injection Mold ?
Answer:
Two plate mould
Three plate mold
Hot runner mould
Insulated runner mold
Hot manifold mold
Stacked mildew
Question: forty. What Is Two Plate Mold ?
Answer:
Mold which consists of center and hollow space located in plates. It is logical type tool wherein element require huge gate. For easy kind components there may be best one daylight hours.
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Question: forty one. What Is three Plate Mold?
Answer:
It is composed feed plates with core and hollow space.
Question: 42. What Is Hot Runner Mold?
Answer:
In this, runner kept hot to hold the molten metal into fluid country additionally called runner less mildew. In this, runner contained in a plate of its very own runner section of the mould isn’t opened at some point of molding cycle.
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Question: 43. Note Down The Advantages Of Runner Mold ?
Answer:
No molded side merchandise
No separation of gait
Cycle time can be decreased
Question: forty four. What Is Insulated Runner Mold ?
Answer:
It is a variation of hot runner mildew in this type of molding. The outer floor of the cloth in the runner acts as a insulator.
Question: forty five. What Is Hot Manifold Mold ?
Answer:
This is a version of the heated warm runner and not the runner plate. This is performed the usage of electric powered cartridge.
Question: forty six. What Do You Meant By Stacked Mold?
Answer:
A stacked mildew is a multiple two plate mildew with mould placed one over the opposite. A stacked mold production doubles the output from a single molding gadget and calls for the equal clamping force.
Question: forty seven. Explain About Injection Molding?
Answer:
In this system, the plastic fabric is injected in to the mildew through a sprue bush by a screw plunger. This manner can be used for each thermosetting and thermoplastic materials.
Question: 48. What Is Compression Molding?
Answer:
In this system, the plastic fabric is positioned within the cavity and use a force for compressing the compound as the mold closes, those molds are commonly used for thermosetting substances.
Question: 49. What Is Transfer Mold?
Answer:
In this technique, the plastic materials is transferred from a switch pot after which pressured in to the cavity by plunger. This method is used for molding thermosetting substances best.
Question: 50. Write A Short Note About Blow Molding ?
Answer:
Blow molding could be very similar to compression molding due to the fact the blow mould usually closes on a hollow shape that has been deposited in among the halves of the mildew. Air or gasoline stress is introduced at the middle. This inner strain causes a drift of the heated fabric in to intimate touch with the incredibly bloodless mould sections. Here the plastic cloth solidifies and is subsequently ejected.
Question: fifty one. Explain Vacuum Molding?
Answer:
The mold used for this technique is similar that of the lady 1/2 of the compression or blow mould auxiliary device at the machine heats the material and drags it over the hollow space as indicated by using the proper method selected.
Question: fifty two. Elaborate About Rotational Molding?
Answer:
The device gives the way of retaining the mold and rotating it approximately axis at the same time. This rotation reasons the powdered material that was loaded in to the mould earlier than it changed into clamped in to the gadget to solidify and adhere to the wall of the mould.
Question: fifty three. What Is Impression ?
Answer:
Gap between core and cavity is referred to as influence.Impression gives the form of the factor.
Question: 54. What Do You Meant Cavity?
Answer:
Female portion of the mildew and it offers outside form.
Question: 55. What Is Core ?
Answer:
Male part of the mildew and it gives internal form.
Question: fifty six. What Is Sprue Bush?
Answer:
Connecting member between sign up ring and runner.
Question: 57. What Is Register Ring ?
Answer:
It is used to align the mold with machine platen.
Question: fifty eight. What Is Runner?
Answer:
Connecting member among gate and sprue bush.
Question: fifty nine. What Is Gate?
Answer:
Connecting member between impression and runner.
Question: 60. How Can We Calculate The Cycle Time Of Mold?
Answer:
Cycle time Tc=m*3600/P
Where ,Tc =minimum cycle time obtainable
M=mass of the shot
P=plasticizing capability of the machine with the unique polymer being molded (kg/h)
Question: sixty one. What Is Parting Surface?
Answer:
The surface in which top and backside half closed together and forestalls the loss of plastic fabric from the impression.
Question: sixty two. What Are The Types Of Parting Surface?
Answer:
Flat and non flat
Question: 63. Name The Types Of Non Flat Parting Surfaces?
Answer:
Straight, stepped and angular.
Question: sixty four. What Do You Meant Flash ?
Answer:
If the parting surfaces aren’t nicely matched, the molding cloth from the affect will break out thru the gap. This escaped melt is referred to as the flash.
Question: sixty five. Why Do We Provide Vent In Mold?
Answer:
Vents are furnished within the mildew to permit such air to escape freely. The vent is a shallow slot now not greater than zero.05 mm deep and 3mm extensive. If the intensity is greater, the plastic material can skip through the slot and depart a flash mark.
Question: 66. What Are The Types Of Runner ?
Answer:
Fully rounded
Rectangular
Hexagonal
Trapezoidal
Modified trapezoidal
Question: 67. Explain Briefly About Sprue Gate ?
Answer:
When the molding is without delay fed from a sprue or secondary sprue, the feed segment is term as sprue gate.The essential downside with this sort of gate is that it leaves a huge gate mark at the molding. This sprue gate is used best for unmarried impact molds.
Question: sixty eight. What Is Rectangular Gate?
Answer:
This is the overall motive gate and it is a rectangular channel machined in on mould plate to connect the runner to the influence.
Question: 69. Write A Short Note About Fan Gate?
Answer:
Fan gate can be considered as the alternative kind of part gate but it does no longer have a steady width and depth. The fan shape spreads the go with the flow of the soften as it enters the impact and a more uniform filling is obtained with much less waft marks and surface end.
Question: 70. What Is Tab Gate?
Answer:
This is particular gating technique for feeding solid block sorts moldings. This is in particular used to avoid undesirable jetting at the molded element.
Question: seventy one. What Is Overlap Gate ?
Answer:
It can be taken into consideration as a version of basic rectangular area gate and is used to feed certain kind of molding. In this sort of gate we’ve got a better manipulate over the float fee. Main drawback is that it leaves huge remnant mark after degiating.
Question: 72. What Is Diaphragm Gate ?
Answer:
This gate is used for single impact tubular fashioned moldings on two plate molds.
Question: 73. What Is Ring Gate?
Answer:
The function of this gate is identical to that of a diaphragm gate. This sort of gate is used for tabular kind moldings whilst a couple of affect is required in a easy mould.
Question: seventy four. What Is Film Gate?
Answer:
This is an extended rectangular type facet gate and it’s far used for massive skinny walled additives to help in the production of warfare web page loose merchandise.
Question: seventy five. What Is Pin Gate?
Answer:
Used for 3 plate mould and beneath feed mold. Small degating mark may be there.
Question: 76. What Is Round Edge Gate?
Answer:
This gate is formed by way of machining a matching semi circular channel in each mold plates among the runner and impact.
Question: 77. What Is Submerged Gate?
Answer:
Automatic degating with less mark also called as sub floor gate or submarine gate.
Question: 78. What Is Winkle Gate?
Answer:
This is a curved version of the subsurface gate and for this reason it’s far every so often referred to as a “curved subsurface gate” or “curved tunnel gate”.
Question: seventy nine. What Are The Types Of Injection Techniques ?
Answer:
Pin injection
Sleeve injection
Stripper bar injection
Blade injection
Valve injection
Air injection
Stripper ring injection
Stripper plate injection
Question: 80. What Is Pin Injection ?
Answer:
This is the maximum commonplace and easy form of injection. The molding is ejected via the utility of a force via ejector pins.
Question: 81. What Do You Meant By Sleeve Injection ?
Answer:
In this method, the molding is ejected by a hallow ejector pin that’s called sleeve.
Question: 82. What Is Stripper Bar Injection?
Answer:
This technique of injection is appropriate for skinny wall box type moldings because of the powerful injection place obtainable are greater.
Question: 83. What Is Blade Injection ?
Answer:
The important cause of blade ejector is for the injection of very slim elements which include ribs and other projections which can not be satisfactorily ejected via the same old kind of ejector pin.
Question: eighty four. What Is Valve Injection ?
Answer:
A valve ejector is basically a big diameter ejector pin. It is used for the injection of big components.
Question: 85. What Is Air Injection ?
Answer:
This is the best to put in. It is simple to hook up with the fixed or moving 1/2. The medium of actuation is compressed air.
Question: 86. Explain Briefly Stripper Ring Injection?
Answer:
The stripper ring is a local stripper plate and it’s miles used on molds with one or impression most effective. The stripper ring is made to seat in the mold plate.
Question: 87. What Is Stripper Plate Injection?
Answer:
This injection method is used specially for the injection of round container type moldings and for moldings with thin wall sections.
Question: 88. Name The Methods Used For Actuation Of Stripper Plate?
Answer:
Tie rod actuation
Length bolt actuation
Chain actuation
Direct actuation
Question: 89. Define Shrinkage ?
Answer:
When a warm plastic cools interior a mildew, it contracts through an quantity depending at the cloth being processed and the final product is smaller than the mildew length is called shrinkage.
Question: ninety. What Are The Factors Which Affect The Increase In Shrinkage ?
Answer:
Increase of cloth temperature.
Increase of mould temperature.
Increase in wall thickness.
Low injection pressure.
Question: 91. What Are The Factors Which Effect The Decrease In Shrinkage ?
Answer:
Low melt and mold temperature
High injection pressure
Long injection time
Presence of filler substances and its content
Question: ninety two. What Is Undercut Molding?
Answer:
A molding which has a recess or projection is named as an undercut molding
Question: ninety three. What Do You Mean External Undercut?
Answer:
Any recess or projection on the out of doors floor of the element which prevents its elimination from hollow space is called an external undercut
Question: ninety four. Name The Methods Of Split Actuation?
Answer:
Finger cam actuation
Dog leg cam actuation
Cam song actuation
Spring actuation
Hydraulic actuation
Question: ninety five. How Can We Calculate Finger Cam Length?
Answer:
Finger cam duration =(M/Sin Q) +(2c) l Sin 2Q
Where
M= split movement
Q=perspective of finger cam
L=working length
C =clearance
Question: ninety six. Where We Use Side Core And Side Cavity ?
Answer:
A side middle is a neighborhood middle that’s usually hooked up at right angled to the mildew axis for forming a hole or recess inside the aspect face of a molding. The aspect cavity performs a similar characteristic to the aspect core, in that it lets in the molding of additives which are not in line of draw. This detail allows the components with a projection or projections on one or extra in their facet faces.
Question: ninety seven. Where We Use Form Pin Straight Action Method ?
Answer:
For the additives which has internal undercut on one facet of the wall.
Question: 98. What Is Single Daylight Mold ?
Answer:
When a fundamental mildew is opened, there is most effective one area or “sunlight hours “ between the two mildew halves. This is called a single daylight mold.
Question: ninety nine. Explain About Double Daylight Stripper Plate Mold ?
Answer:
A stripper plate mold includes a fixed plate, a shifting mildew plate and a stripper plate. There are two day light while opened. This is referred to as double sunlight hours stripper plate mold.
Question: a hundred. What Is Underfeeding Mold?
Answer:
An underfeeding mould is the only in which the feed gadget is arranged to feed into the bottom of the aspect.
Question: one hundred and one. What Are The Types Of Injection Molding Defects ?
Answer:
Sink mark, Streaks, Blisters/Bubbles, Weld line, Ejector marks, Cold weld, Jetting, War page
Question: 102. Define Sink Mark ?
Answer:
Sink marks are the localized contractions or the depressions at the floor of the moldings.
Question: 103. What Is Blister Or Bubbles ?
Answer:
Hollows created on or within the molded part.
Question: 104. What Is Weld Line ?
Answer:
It is the witness marks of or more melt waft fronts at their joining quarter.
Question: 105. What Is Jetting ?
Answer:
It is the distinguished in-homogeneous snake like strands on the floor of molding.
Question: 106. What Is War Page ?
Answer:
War web page is the deviation of the mildew component from its required shape.
Question: 107. What Is Bulk Factor?
Answer:
Bulk issue is described because the ratio of the quantity of the loose powder to the quantity of the molded part.
Question: 108. What Are The Types Of Compression Molds?
Answer:
Flash mould
Fully positive mildew
Semi wonderful mold
Landed effective mildew
Question: 109. Write A Short Note About Performs ?
Answer:
Performs are small pellets or capsules of molding cloth which might be shaped to shape in a special plays mould at room temperature. Curing won’t takes place best densification.
Question: one hundred ten. Name The Types Of Transfer Molds ?
Answer:
Pot transfer mold
Plunger transfer mould
Question: 111. What Is Die Casting?
Answer:
Pressure die casting is the method wherein the molten metal is pressured underneath high strain into a hollow space in a metallic disc with in fraction of a 2nd and allowed to solidify.
Question: 112. What Are The Types Of Die Casting ?
Answer:
Hot chamber system
Cold chamber method
Question: 113. What Are The Types Of Die Casting Defects ?
Answer:
Cold defects
Hot defects
Miscellaneous defects
Question: 114. Example For Cold Defects ?
Answer:
Lack of fill, cold close, excessive chill, sit back, go with the flow strains
Question: one hundred fifteen. Examples For Hot Defects ?
Answer:
Soldering, cracks, broken component, bent part, warmness marks or shrinkage pits.