MRF Tyres R&D Engineer Interview Questions and Answers

Q1. Company knowledge
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Q2. CV or resume related questions
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Q1. CNC programming knowledge
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Q2. Material & milling tool knowledge
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Q1. Previous experiences discussion
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Q2. Salary & HR formalities
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Q1. What is the relay
Ans. 
A relay is an electrically operated switch that uses an electromagnet to mechanically operate a switch.
• Relays are used to control high power circuits with low power signals

• They are commonly used in automotive, industrial, and household applications

• Relays can be classified based on their operation, such as electromechanical relays or solid-state relays
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Q2. Ohm's law and current
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Ohm's law states that the current flowing through a conductor is directly proportional to the voltage across it, given constant resistance.
• Ohm's law equation: V = I * R (voltage = current * resistance)

• Current is the flow of electric charge through a conductor

• Higher voltage leads to higher current flow, given constant resistance

• Lower resistance leads to higher current flow, given constant voltage
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Q1. Explain various GD&T
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Geometric Dimensioning and Tolerancing (GD&T) is a system for defining and communicating engineering tolerances.
• GD&T is used to specify the allowable variations in form, size, and orientation of features on a part.

• It uses symbols, such as concentricity, flatness, and perpendicularity, to communicate the desired tolerances.

• GD&T helps ensure that parts fit together properly and function as intended.

• Examples of GD&T symbo...read more
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Q2. Explain DFM, DFS, DFA
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DFM, DFS, and DFA stand for Design for Manufacturing, Design for Service, and Design for Assembly, respectively.
• DFM focuses on designing products that are easy and cost-effective to manufacture.

• DFS focuses on designing products that are easy to service and maintain.

• DFA focuses on designing products that are easy to assemble.

• Consideration of DFM, DFS, and DFA principles can lead to more efficient and cost-effective prod...read more
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Tough one to attempt

Q1. Asked questions related to few mechanical engineering topics
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Q1. Plastics and their uses
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Plastics are versatile materials used in various industries for their durability, flexibility, and cost-effectiveness.
• Plastics are commonly used in packaging materials such as bottles, containers, and bags.

• They are also used in construction for pipes, insulation, and flooring.

• In the automotive industry, plastics are used for interior components, bumpers, and body panels.

• Plastics are essential in electronics for casings...read more
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Q1. Explain Free body Diagram ?
Ans. 
Free body diagram is a visual representation of all the forces acting on an object in a given situation.
• It shows all the forces acting on an object as vectors, with arrows indicating the direction and magnitude of each force.

• The object of interest is represented as a point or a simple shape, with all external forces acting on it shown around it.

• Internal forces within the object are not shown on a free body diagram.

• Free...read more
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Q2. What is the working principle of a brake system ?
Ans. 
A brake system works by converting kinetic energy into heat energy through friction to slow down or stop a vehicle.
• Brake pedal is pressed by the driver

• Brake fluid is compressed in the master cylinder

• Pressure is transmitted through brake lines to the brake calipers or wheel cylinders

• Brake pads or shoes press against the brake rotor or drum to create friction and slow down the vehicle
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Q1. What is Stack up tolerance ?
Ans. 
Stack up tolerance refers to the accumulation of tolerances in a series of components or parts that are assembled together.
• Stack up tolerance is important in ensuring that all components fit together properly in an assembly.

• It involves considering the individual tolerances of each component and how they may add up or cancel out when assembled.

• For example, if a shaft has a tolerance of +/- 0.1mm and a hole has a toleran...read more
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Q2. What is the difference between cylindricity and roundness in GD&T ?
Ans. 
Cylindricity refers to the overall 3D form of a cylinder, while roundness refers to the deviation of a circle from a perfect circle.
• Cylindricity is a 3D tolerance that controls the overall form of a cylinder, ensuring that all points on the surface lie within a specified tolerance zone.

• Roundness is a 2D tolerance that controls the deviation of a circle from a perfect circle, ensuring that the entire circle lies within ...read more
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Q1. Create 3d model for the given engineering drawing ?
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To create a 3D model from an engineering drawing, use CAD software to accurately replicate the dimensions and features.
• Use CAD software such as AutoCAD, SolidWorks, or Fusion 360 to create the 3D model.

• Refer to the engineering drawing for dimensions, angles, and features to accurately replicate in the 3D model.

• Utilize tools within the CAD software to create extrusions, cuts, fillets, and other features as needed.

• Check ...read more
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Q2. Do drafting for the given 3d model ?
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Yes, I can create detailed 2D drawings based on the 3D model provided.
• Create orthographic views (top, front, side) of the 3D model

• Include dimensions, annotations, and tolerances in the drawings

• Generate section views to show internal features

• Add surface finish symbols and notes as needed
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Q1. What are factore that affecting the NVH
Ans. 
Factors affecting NVH include vehicle design, materials used, engine type, and road conditions.
• Vehicle design: Shape, size, weight distribution

• Materials used: Quality of materials, insulation

• Engine type: Number of cylinders, power output

• Road conditions: Smoothness, tire type
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Q2. Noise, Vibration, and Harshness (NVH) in gearboxes are influenced by several factors, which can broadly be categorized into design, material, manufacturing, and operational factors. Here are some key facto...read more
Ans. 
Addressing NVH in gearboxes involves optimizing design, material, manufacturing, and operational factors.
• Optimizing gear geometry like tooth profile and helix angle can reduce noise.

• Proper material quality and heat treatment can minimize vibrations.

• Precision machining and assembly quality are crucial for reducing NVH.

• Consider load conditions, lubrication, and operational speed for NVH control.

• Environmental factors like...read more
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Written test related to casting and plastic

Q1. Related to experience
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Q1. Expectation and why you want tomove
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