300+ [UPDATED] Manufacturing Industrial Engineer Interview Questions and Answers

Q1. What Do You Meant By Clamping Force?

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It is the maximum force that the clamping system can exert on the mold or it is the maximum force by which the mold halves can be closed together. It is given in ton or kilo Newton.

Q2. What Are The Types Of Die Casting Defects ?

  • Cold defects 
  • Hot defects
  • Miscellaneous defects

Q3. What Is A Mold ?

It is a custom build tool in which we converts plastic raw material into finished product.

Q4. What Is Ring Gate?

The function of this gate is identical to that of a diaphragm gate. This type of gate is used for tabular type moldings when more than one impression is required in a simple two mold.

Q5. What Is Submerged Gate?

Automatic degating with less mark also called as sub surface gate or submarine gate.

Q6. What Are The Types Of Compression Molds?

  • Flash mold
  • Fully positive mold
  • Semi positive mold
  • Landed positive mold

Q7. About Pa?

Shrinkage 0.7-1.5%. It is tough and high rigid. Examples are light duty gears, sprockets, bearings etc.

Q8. How Can We Calculate The Cycle Time Of Mold?

Cycle time Tc=m*3600/P

 Where ,Tc =minimum cycle time obtainable 

 M=mass of the shot 

P=plasticizing capacity of the machine with the particular polymer being molded (kg/h)

Q9. What Is Hot Runner Mold?

In this, runner kept hot to keep the molten metal into fluid state also called runner less mold. In this, runner contained in a plate of its own runner section of the mold is not opened during molding cycle.

Q10. What Are The Factors Which Affect The Increase In Shrinkage ?

  • Increase of material temperature.
  • Increase of mold temperature.
  • Increase in wall thickness.
  • Low injection pressure.

Q11. Examples For Thermosetting Materials ?

Alkyds, epoxies, pf, mf, urea, polyester

Q12. What Is Plasticizing Capacity ?

It is the amount of material that can be processed by the machine per hour. It is expressed in kg/h.

Q13. What Is Injection Pressure?

It is the maximum pressure by which the material is injected through the nozzle. It is given in kg/cm2.

Q14. What Is Film Gate?

This is a long rectangular type edge gate and it is used for large thin walled components to assist in the production of war page free products.

Q15. Define Drooling ?

Leakage of plastic material through the nozzle in between shots.

Q16. What Are The Mold Release Agents?

  • External with mold surface e.g. Polyvinyl alcohol 
  • Internal with resins eg. Silicon oil

Q17. What Is Injection Capacity Or Short Capacity?

Maximum volume material injected by the screw during one cycle of operation.

Q18. What Is Air Injection ?

This is the simplest to install. It is easy to connect to the fixed or moving half. The medium of actuation is compressed air.

Q19. Explain About Double Daylight Stripper Plate Mold ?

A stripper plate mold consists of a fixed plate, a moving mold plate and a stripper plate. There are two day light when opened. This is called double daylight stripper plate mold.

Q20. About Pvc?

Shrinkage (FLEXI 1.5-3%,RIGID 0.2-0.4%). It is rigid and not very tough and very low cost. Example – Pipes fittings.

Q21. What Is Gate?

Connecting member between impression and runner.

Q22. How Can We Calculate Finger Cam Length?

Finger cam length =(M/Sin Q) +(2c) l Sin 2Q


 M= split movement

 Q=angle of finger cam 

 L=working length 

 C =clearance

Q23. What Do You Mean External Undercut?

Any recess or projection on the outside surface of the component which prevents its removal from cavity is termed an external undercut

Q24. What Is Sprue Bush?

Connecting member between register ring and runner.

Q25. What Is Insulated Runner Mold ?

It is a variation of hot runner mold in this type of molding. The outer surface of the material in the runner acts as a insulator.

Q26. What Is Impression ?

Gap between core and cavity is called impression.Impression provides the shape of the component.

Q27. What Is Valve Injection ?

A valve ejector is basically a large diameter ejector pin. It is used for the injection of large components.

Q28. What Do You Meant Flash ?

If the parting surfaces are not properly matched, the molding material from the impression will escape through the gap. This escaped melt is called the flash.

Q29. Explain Briefly Stripper Ring Injection?

The stripper ring is a local stripper plate and it is used on molds with one or two impression only. The stripper ring is made to seat in the mold plate.

Q30. About Hdpe?

Shrinkage 3-4%. Main features of HDFE are high density, rigidity, strength, hardness and chemical resistance. Examples are milk bottle crates, fish boxes etc.

Q31. What Is Blade Injection ?

The main purpose of blade ejector is for the injection of very slender parts such as ribs and other projections which cannot be satisfactorily ejected by the standard type of ejector pin.

Q32. About Ca ?

Shrinkage 0.3-0.8%. Its main properties are trparency and surface texture. Examples are Tool handle, goggles, TV screens.

Q33. What Are The Types Of Die Casting ?

  • Hot chamber process
  • Cold chamber process

Q34. Explain Vacuum Molding?

The mold used for this process is similar that of the female half of the compression or blow mold auxiliary equipment on the machine heats the material and drags it over the cavity as indicated by the precise technique chosen.

Q35. What Is Runner?

Connecting member between gate and sprue bush.

Q36. Where We Use Side Core And Side Cavity ?

A side core is a local core which is normally mounted at right angled to the mold axis for forming a hole or recess in the side face of a molding. The side cavity performs a similar function to the side core, in that it permits the molding of components which are not in line of draw. This element allows the components with a projection or projections on one or more of their side faces.

Q37. What Is Core ?

Male portion of the mold and it gives internal form.

Q38. Note Down The Advantages Of Runner Mold ?

  • No molded side products 
  • No separation of gait
  • Cycle time can be reduced

Q39. What Is Injection Rate Or Injection Velocity ?

It is the maximum rate at which the screw can inject or shoot materials from the barrel during one shot.

Q40. What Is Single Daylight Mold ?

When a basic mold is opened, there is only one space or “daylight “ between the two mold halves. This is called a single daylight mold.

Q41. What Is Diaphragm Gate ?

This gate is used for single impression tubular shaped moldings on two plate molds.

Q42. What Do You Meant Cavity?

Female portion of the mold and it gives external form.

Q43. Example For Cold Defects ?

Lack of fill, cold shut, severe chill, chill, flow lines

Q44. What Is Blister Or Bubbles ?

Hollows created on or in the molded part.

Q45. What Is Compression Molding?

In this process, the plastic material is placed in the cavity and use a force for compressing the compound as the mold closes, these molds are generally used for thermosetting materials.

Q46. What Is Rectangular Gate?

This is the general purpose gate and it is a rectangular channel machined in on mold plate to connect the runner to the impression.

Q47. What Is Register Ring ?

It is used to align the mold with machine platen.

Q48. Write A Short Note About Blow Molding ?

Blow molding is very much like compression molding because the blow mold generally closes on a hollow shape that has been deposited in between the halves of the mold. Air or gas pressure is introduced at the center. This internal pressure causes a flow of the heated material in to intimate contact with the relatively cold mold sections. Here the plastic material solidifies and is subsequently ejected.

Q49. What Is Stripper Plate Injection?

This injection technique is used mainly for the injection of circular box type moldings and for moldings with thin wall sections.

Q50. About Pc?

Shrinkage 0.5-0.7%. It is known optical trparency, rigidity and toughness. Examples are goggles, lenses, safety helmets etc.