If you have a degree or diploma in mechanical engineering and looking for a job in the mechanical field. This article can help you with your interview preparation. This article covers commonly asked interview questions and answers on manufacturing.
Interview questions discussed here are from the engineering curriculum. If you are aware of mechanical engineering basics, You can answer these questions. We suggest you also read this article on frequently asked technical interview questions to mechanical freshers.
Here are the mechanical engineering interview questions with answers:
What are various drilling machine operations?
Drilling, Reaming, Tapping, Boring, counter-boring, countersinking, and spot facing are drilling machine manufacturing operations. Refer this article for more details on drilling machine operations.
What are various lathe machine operations?
Following are some commonly performed lathe machine operations :
- Facing
- Turning
- Thread cutting and Tapping
- Drilling / Boring and reaming
- Chauffeuring
- Grooving
- Knurling
What is the forging process?
Forging is a metal shaping process by applying localized force. Force is applied using a hammer or a die. Here is a list of various types of forging processes.
- Cold Forging
- Warm Forging
- Hot Forging
What is the Casting Process?
Casting is a metal shaping process where a liquid material is poured into a mold and then allowed to solidify to get the desired shape. The solidified part is known as casting.
Below are various types of casting processes used in the mechanical Industry:
- Sand Casting
- Pressure Die Casting
- Investment Casting.
- Permanent mold casting etc.
What is the metal extrusion process?
It is a process to manufacture fixed cross-sectional long profiles. A plunger pushes the material through a die of the required cross-section in the metal extrusion process.
The advantages of the extrusion process are its ability to create very complex cross-sections.
What is the difference between a shaper and a Planer Machine?
In the Shaper machine, the workpiece is held stationary, and the cutting tool on the ram is moved back and forth across the workpiece.
Whereas in a planar machine, the tool is stationary, and the workpiece travels back and forth under the cutting tool.
What is a press tool?
Press tools are used in hydraulic, pneumatic, and mechanical presses to produce sheet metal components. Sheet metal blanking, piercing, bending, forming, forging, and trimming are bending machine operations.
What is a stamping operation in sheet metal?
Stamping is a sheet metal process of giving shape to sheet metal parts.
What is the difference between the hot rolling and cold rolling process?
The hot rolling process involves rolling steel above re-crystallization temperature. During cooling, steel will shrink. Therefore the size and shape of the steel will be less predictable.
The cold rolling process involves rolling steel below re-crystallization temperature (at room temp). Therefore there is no chance of steel shrinkage.
Refer to this article to know the difference between hot rolling and cold rolling steel.
What is the broaching Operation?
Broaching utilizes a toothed tool (known as a broach) to remove material from the workpiece. Broach tool cut the material in one pass.
Types of Broaching:
- Linear Broaching: The broach tool runs linearly against the surface of the workpiece to cut the material.
- Rotary Broaching: Broach is rotated and pressed into the workpiece to cut an axis symmetric shape. A rotary broach tool is used in a lathe or screw machine for rotary broaching.
What is swaging?
Swaging is a cold working forging process. We can modify the part dimensions by forcing material into swaging dies.
What is the difference between soldering, brazing, and welding?
Welding :
Welding is an operation to join two or more similar materials by melting base material or using a filler material rod. The strength of welded parts is similar to the base materia strengthl. Spot & seam welding utilizes the pressure along with heat to weld parts. Read this article to know the difference between TIG and MIG Welding.
Brazing
Brazing is an operation to join two or more metal parts by melting and flowing a filler metal into the joint. Filler metal rods always have a lower melting temperature compared to base metals.
Soldering
Soldering is a joining operation (usual metals) by melting and flowing a filler metal (also known as solder wire) into the joint. Filler metal always has a lower melting temperature compared to base metals. Soldering flux is required for doing good quality solder.
Read this article to know the difference between Soldering, Brazing, and welding.
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