50+ JTEKT Interview Questions and Answers

Rectifier, types of motor, difference between servo motor and induction motor

• Rectifier is an electrical device that converts alternating current (AC) to direct current (DC)

• Types of motors include DC motors, AC motors, servo motors, and induction motors

• Servo motors are used in applications that require precise control of position, velocity, and acceleration

• Induction motors are commonly used in industrial applications due to their robustness and simplicity

• Difference between ser...read more

A transformer is an electrical device that transfers electrical energy from one circuit to another through electromagnetic induction.

• Transformers are used to either step up or step down voltage levels.

• Step down transformers decrease voltage levels, while step up transformers increase voltage levels.

• Types of transformers include power transformers, distribution transformers, isolation transformers, autotransformers, and instrument transformers.

• Power transformers are used in po...read more

Take time, cycle time, and lead time are important metrics in production engineering.

• Take time is the time required to complete a single unit of production.

• Cycle time is the time required to complete a single step in the production process.

• Lead time is the time required to complete an entire production process from start to finish.

• Reducing cycle time can increase production efficiency.

• Reducing lead time can improve customer satisfaction.

• Take time is often used to calculate cy...read more

Torque is a twisting force that causes rotation, while force is a push or pull that causes an object to move or change direction.

• Torque is measured in units of force multiplied by distance, such as newton-meters or pound-feet.

• Force is measured in units of mass multiplied by acceleration, such as newtons or pounds.

• Torque is important in rotating machinery, such as engines and motors.

• Force is important in many applications, such as lifting heavy objects or pushing a car.

• Both to...read more

Line balancing is the process of optimizing workloads across a production line. Loss cycle time refers to the time lost due to inefficiencies in the production process.

• Line balancing involves analyzing the production process to ensure that each workstation is being utilized efficiently

• The goal of line balancing is to minimize idle time and maximize productivity

• Loss cycle time refers to the time lost due to factors such as machine breakdowns, material shortages, and worker ine...read more

PLC stands for Programmable Logic Controller. It is an industrial computer used to automate processes.

• PLCs are used to control and monitor industrial processes such as assembly lines, power plants, and water treatment facilities.

• They are programmed using ladder logic or other programming languages.

• PLCs can be used to control various types of equipment such as motors, valves, and sensors.

• They are designed to operate in harsh environments and can withstand extreme temperatures,...read more

TSV stands for Test Specification and Verification. Testing process involves planning, designing, executing and reporting tests.

• TSV is a document that outlines the testing requirements and procedures

• Testing process involves identifying test scenarios and cases

• Test cases are executed and results are recorded

• Defects are reported and retested until resolved

• Final test report is generated

JH and JH steps are quality control methodologies used in manufacturing. 5S is a workplace organization method.

• JH stands for Job Handling and JH steps are a set of procedures used to ensure quality control in manufacturing processes.

• 5S is a workplace organization method that involves sorting, simplifying, sweeping, standardizing, and sustaining.

• JH steps and 5S are often used together to improve efficiency and quality in manufacturing operations.

FRL unit is a filter, regulator, and lubricator unit used in compressed air systems. Solenoid valves are electromechanical valves used to control the flow of fluids.

• FRL unit is used to filter, regulate, and lubricate compressed air in pneumatic systems

• Solenoid valves are used to control the flow of fluids in various applications

• Solenoid valves are electromechanical valves that use an electric current to control the valve's position

• FRL units are important for maintaining the q...read more

Assembly line processing is a manufacturing process where a product is assembled in a sequential manner by different workers or machines.

• It involves dividing the production process into smaller tasks

• Each worker or machine performs a specific task in a sequential manner

• The product moves from one station to another until it is completed

• It increases efficiency and reduces production time and cost

• Examples include automobile manufacturing, electronics assembly, and food processing

Stress is the force applied to a material, while strain is the resulting deformation or change in shape.

• Stress is a measure of the internal resistance of a material to deformation under an applied force.

• Strain is the measure of the deformation or displacement of material in response to stress.

• Stress is typically measured in units of force per unit area (such as N/m^2 or Pa), while strain is dimensionless.

• Stress can cause strain in a material, leading to changes in its shape o...read more

OEE stands for Overall Equipment Effectiveness and PPLH stands for Production Per Labor Hour.

• OEE is a metric used to measure the efficiency of manufacturing processes.

• It takes into account three factors: availability, performance, and quality.

• PPLH is a metric used to measure the productivity of labor in manufacturing processes.

• It is calculated by dividing the total production output by the total labor hours.

• Both OEE and PPLH are important metrics for production engineers to o...read more

FIFO and LIFO are inventory management methods used to manage stock and determine the cost of goods sold.

• FIFO stands for First-In, First-Out, which means that the first items purchased are the first items sold.

• LIFO stands for Last-In, First-Out, which means that the last items purchased are the first items sold.

• FIFO is commonly used in industries where perishable goods are sold, such as food and beverage.

• LIFO is commonly used in industries where the cost of goods sold is risi...read more

A piston is a component in an engine that moves up and down in a cylinder, converting pressure into mechanical motion. A crankshaft is a rotating shaft that converts reciprocating motion into rotational motion. A bearing is a device that supports and reduces friction between moving parts.

• Piston: Moves up and down in a cylinder, sealed by piston rings. Transfers force from expanding gases to the crankshaft.

• Crankshaft: Converts the reciprocating motion of the piston into rotati...read more

Two-stroke engines have a simpler design and produce more power, but are less fuel-efficient and emit more pollution compared to four-stroke engines.

• Two-stroke engines complete a power cycle in two strokes of the piston, while four-stroke engines complete it in four strokes.

• Two-stroke engines have a simpler design with fewer moving parts, making them lighter and more compact.

• Four-stroke engines have separate intake, compression, power, and exhaust strokes, resulting in better...read more

TPM stands for Total Productive Maintenance and TQM stands for Total Quality Management.

• TPM is a maintenance program that aims to maximize equipment effectiveness and minimize downtime.

• TQM is a management approach that focuses on continuous improvement of product quality and customer satisfaction.

• TPM involves all employees in the maintenance process and emphasizes preventive maintenance.

• TQM involves all employees in the quality improvement process and emphasizes customer sati...read more

Manpower handling refers to managing and overseeing the workforce in a production setting. Kaizen is a continuous improvement philosophy aimed at making small, incremental changes for efficiency.

• Manpower handling involves recruiting, training, scheduling, and supervising employees to ensure smooth production operations.

• Kaizen is a Japanese term meaning 'continuous improvement'. It focuses on making small, incremental changes in processes, systems, and behaviors to improve eff...read more

The least count of a vernier calliper and micrometre refers to the smallest measurement that can be accurately read on the instrument.

• The least count of a vernier calliper is typically 0.02 mm or 0.001 inches.

• The least count of a micrometre is typically 0.01 mm or 0.001 inches.

• The least count is determined by the number of divisions on the main scale and the vernier scale.

• For example, if the main scale has divisions of 1 mm and the vernier scale has 50 divisions, the least co...read more

There are two main types of processes: foreground processes and background processes.

• Foreground processes are interactive and require user input, such as running a program in the terminal.

• Background processes run independently of user input, such as system daemons or scheduled tasks.

Petrol and diesel engines differ in fuel type, ignition process, compression ratio, and efficiency.

• Fuel type: Petrol engines use gasoline while diesel engines use diesel fuel.

• Ignition process: Petrol engines use spark plugs to ignite the fuel-air mixture, while diesel engines use compression ignition.

• Compression ratio: Diesel engines have higher compression ratios than petrol engines.

• Efficiency: Diesel engines are generally more fuel-efficient than petrol engines.

• Examples: Pe...read more

Quality is meeting or exceeding customer expectations, production is the process of creating goods or services, TPM is Total Productive Maintenance.

• Quality is the degree to which a product or service meets customer requirements and expectations.

• Production is the process of converting raw materials or components into finished goods or services.

• TPM (Total Productive Maintenance) is a proactive approach to maintenance that aims to maximize equipment effectiveness and minimize do...read more

Circle ovality can be caused by various factors such as machine vibration, tool wear, improper fixturing, or material inconsistencies.

• Machine vibration during machining process

• Tool wear leading to inaccurate cutting

• Improper fixturing causing misalignment

• Material inconsistencies such as uneven hardness or density

• Incorrect machine settings or programming

5S is a workplace organization method that improves efficiency and safety. 3M and 3K refer to the principles of Muda, Mura, and Muri in lean manufacturing. KANBAN is a visual scheduling system used to manage production flow.

• 5S involves Sort, Set in order, Shine, Standardize, and Sustain to create a clean and organized work environment.

• 3M (Muda, Mura, Muri) are the three types of waste in lean manufacturing - Muda (waste), Mura (unevenness), and Muri (overburden).

• KANBAN is a v...read more

The type of machine being referred to could be any machine related to the field of ITI Fitter, such as lathe machine, milling machine, drilling machine, etc.

• Lathe machine

• Milling machine

• Drilling machine

• Grinding machine

• Shaping machine

The least count of a Vernier caliper is the smallest measurement that can be read on the scale.

• The least count is determined by the number of divisions on the main scale and the Vernier scale.

• It is calculated by dividing the smallest division on the main scale by the total number of divisions on the Vernier scale.

• For example, if the smallest division on the main scale is 0.1 mm and the total number of divisions on the Vernier scale is 10, the least count would be 0.01 mm.

The code of machining for making a program involves creating instructions for a machine to follow in order to produce a desired output.

• The program should include specific instructions for the machine to follow, such as tool selection, cutting speed, and feed rate.

• The code should be optimized for efficiency and accuracy.

• It is important to consider the material being machined and adjust the program accordingly.

• Testing and debugging the program is crucial to ensure the final pro...read more

Tolerance refers to the allowable variation or deviation from a specified dimension or value.

• Tolerance is important in manufacturing to ensure that parts and components fit together properly.

• It is expressed as a range or limit within which a dimension or value can vary.

• Tolerance can be specified for various parameters such as size, shape, weight, temperature, etc.

• For example, if a machine part has a tolerance of ±0.1mm, it means that the actual dimension can vary by up to 0.1...read more

Diesel engines and petrol engines differ in their fuel type, ignition process, and efficiency.

• Fuel type: Diesel engines use diesel fuel, while petrol engines use gasoline.

• Ignition process: Diesel engines use compression ignition, while petrol engines use spark ignition.

• Efficiency: Diesel engines are generally more fuel-efficient than petrol engines.

• Examples: Cars, trucks, and buses often use petrol engines, while heavy-duty vehicles and generators commonly use diesel engines.

An encoder is a device used to convert motion or position into a coded signal.

• Encoders are commonly used in robotics, CNC machines, and industrial automation.

• They can be either absolute or incremental, with absolute encoders providing a unique code for each position and incremental encoders providing a relative change in position.

• Encoders can be rotary or linear, depending on the type of motion being measured.

• They are often used in closed-loop control systems to provide feedb...read more

A transformer is an electrical device that transfers electrical energy from one circuit to another through electromagnetic induction.

• Transformers are used to increase or decrease the voltage of an alternating current (AC) power supply.

• They work on the principle of electromagnetic induction, where a changing magnetic field induces a voltage in a coil of wire.

• Transformers consist of two coils of wire, called the primary and secondary coils, wrapped around a magnetic core.

• The pr...read more

Mechanical properties of materials refer to their ability to withstand applied forces without failure.

• Mechanical properties include strength, hardness, toughness, ductility, and elasticity.

• Strength is the ability of a material to withstand an applied force without failure.

• Hardness is the resistance of a material to deformation or scratching.

• Toughness is the ability of a material to absorb energy and plastically deform without fracturing.

• Ductility is the ability of a material ...read more

Programming of CNC VMC involves creating instructions for the machine to follow in order to produce a specific part.

• Requires knowledge of programming languages such as G-code and M-code

• Involves creating a step-by-step process for the machine to follow

• Requires understanding of the machine's capabilities and limitations

• May involve creating custom tool paths for specific parts

• Examples include programming a CNC VMC to produce a complex aerospace component or a simple metal bracke...read more

7 QC is a set of quality control tools used in manufacturing to identify and solve production problems.

• 7 QC stands for Seven Quality Control tools

• These tools include Pareto analysis, cause-and-effect diagram, check sheet, control chart, histogram, scatter diagram, and flowchart

• They are used to analyze data, identify root causes of problems, and make informed decisions for process improvement

PPL stands for Production Per Labour and PPLH stands for Production Per Labour Hour.

• PPL is a measure of how much production is achieved per unit of labor input.

• PPLH is a measure of how much production is achieved per labor hour.

• Both metrics are used to evaluate the efficiency of production processes.

• For example, if a factory produces 100 units with 10 workers, the PPL would be 10 units per worker.

• If the same factory operates for 8 hours and produces 800 units, the PPLH would ...read more

The least count of a micrometer is the smallest measurement that can be read on the micrometer scale.

• The least count is determined by the number of divisions on the micrometer scale and the pitch of the screw.

• It is usually expressed in micrometers or millimeters.

• For example, if a micrometer has 50 divisions on the scale and the pitch of the screw is 0.5 mm, the least count would be 0.01 mm (0.5 mm / 50 divisions).

A working engine is a mechanical device that converts energy into mechanical motion.

• Engines are commonly used in vehicles, machinery, and power generation.

• They typically operate by burning fuel to create a controlled explosion, which drives pistons or turbines.

• Different types of engines include internal combustion engines, steam engines, and gas turbines.

• Engines require various components such as cylinders, pistons, valves, and a fuel delivery system.

• Regular maintenance and l...read more

Quality in a company refers to meeting or exceeding customer expectations through consistent and reliable products or services.

• Quality is about meeting customer expectations and delivering products or services that consistently meet or exceed those expectations.

• It involves ensuring that products or services are reliable, consistent, and free from defects.

• Quality also includes factors such as customer satisfaction, compliance with regulations and standards, and continuous impr...read more

Meeting customer expectations

• Customer satisfaction

• Consistency in performance

• Continuous improvement

Arc welding uses an electric arc to melt and join metals, while spot welding uses pressure and heat to join two metal surfaces.

• Arc welding involves creating an electric arc between an electrode and the metal being welded, which melts the metal and fuses it together.

• Spot welding involves applying pressure and heat to two metal surfaces, which creates a small weld at the point of contact.

• Arc welding is typically used for thicker metals and can be done with a variety of welding ...read more

Strain diagram shows the relationship between stress and strain in a material.

• Stress diagram shows the relationship between stress and deformation.

• Strain diagram is used to determine the elastic modulus, yield strength, and ultimate strength of a material.

• Stress diagram is used to determine the stress concentration and stress distribution in a material.

• Both diagrams are important in material testing and analysis.

I'm sorry, but I don't understand the question. Could you please clarify?

Backlash can be checked by measuring the amount of free movement between two mating components.

• Use a dial indicator to measure the amount of movement between the two components

• Rotate one component while holding the other stationary to check for any play

• Compare the measured value to the manufacturer's specifications

• Adjust the components if necessary to reduce the amount of backlash

A quality example is when a product meets or exceeds customer expectations in terms of performance, reliability, and durability.

• Consistent product performance under various conditions

• High level of reliability with minimal defects

• Long-lasting durability exceeding expected lifespan

A spark plug is an electrical device that fits into the cylinder head of an internal combustion engine and ignites compressed fuel and air mixture.

• It is a crucial component in the ignition system of a gasoline engine

• It produces an electric spark that ignites the fuel-air mixture in the combustion chamber

• It needs to be replaced periodically based on the manufacturer's recommendation

• Different types of spark plugs are available for different engine types and performance requirem...read more

Steering is rotating to change the direction of the vehicle.

• Steering is necessary to change the direction of the vehicle.

• It is achieved by rotating the front wheels.

• The steering wheel is connected to the front wheels through a system of gears and linkages.

• The rotation of the steering wheel causes the front wheels to turn in the desired direction.

• The amount of rotation determines the degree of turn.

• Power steering systems use hydraulic or electric assistance to make steering ea...read more

I'm sorry, but I don't understand the question. Could you please clarify?

IC engine is an internal combustion engine that converts chemical energy into mechanical energy.

• IC engine works on the principle of internal combustion, where fuel is burned inside the engine to produce power.

• It consists of four strokes: intake, compression, combustion, and exhaust.

• During the intake stroke, the fuel-air mixture is drawn into the cylinder.

• In the compression stroke, the mixture is compressed to increase its pressure and temperature.

• The combustion stroke involve...read more

There are various types of motors used in different applications, such as AC motors, DC motors, synchronous motors, and induction motors.

• AC motors are commonly used in household appliances and industrial applications.

• DC motors are often used in battery-operated devices and electric vehicles.

• Synchronous motors are used in applications where precise speed control is required, such as in clocks and timers.

• Induction motors are widely used in industrial settings for their reliabil...read more

A transformer is a device that transfers electrical energy between two or more circuits through electromagnetic induction.

• Transformers are used to increase or decrease voltage levels in electrical circuits.

• There are two main types of transformers: step-up transformers and step-down transformers.

• Step-up transformers increase voltage levels, while step-down transformers decrease voltage levels.

• Examples of transformers include power transformers used in electrical substations an...read more

Joshu Hosen is a problem-solving methodology consisting of 7 steps.

• Identify the problem

• Analyze the root cause

• Develop countermeasures

• Implement countermeasures

• Verify effectiveness

• Standardize the solution

• Reflect on the process