JSW Steel Maintenance Supervisor Interview Questions and Answers

Q1. What is relay what do work
Ans. 
A relay is an electrical device that acts as a switch to control the flow of current in an electrical circuit.
• Relays are used to control high-power devices with low-power signals.

• They consist of an electromagnet and a set of contacts.

• When the electromagnet is energized, it creates a magnetic field that attracts or releases the contacts, allowing or interrupting the flow of current.

• Relays are commonly used in industrial...read more
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Q2. What is reverse forward draw the control wirring
Ans. 
Reverse forward draw is a control wiring method used in electrical systems to control the direction of rotation of a motor.
• Reverse forward draw is used to control the direction of rotation of a motor.

• It involves the use of a forward contactor and a reverse contactor.

• The control wiring includes connections between the contactors, motor, and power supply.

• By energizing the forward contactor, the motor rotates in one direc...read more
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Q3. What is ac motor
Ans. 
An AC motor is a type of electric motor that operates on alternating current.
• AC motor stands for Alternating Current motor.

• It converts electrical energy into mechanical energy.

• AC motors are commonly used in household appliances, industrial machinery, and vehicles.

• They are more efficient and require less maintenance compared to DC motors.

• Examples of AC motors include induction motors, synchronous motors, and brushless m
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Q4. What is different between ac and dc motor
Ans. 
AC motors and DC motors differ in their power source, construction, speed control, and applications.
• AC motors run on alternating current, while DC motors run on direct current.

• AC motors are more commonly used in household appliances, industrial machinery, and electric vehicles.

• DC motors are often found in battery-powered devices, such as laptops, electric cars, and robots.

• AC motors have a simpler construction with fewe...read more
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Q5. What is. MCB
Ans. 
MCB stands for Miniature Circuit Breaker.
• MCB is an electrical switch that automatically interrupts the flow of current in an electrical circuit during an overload or short circuit.

• It is a type of circuit breaker that is commonly used in residential and commercial buildings.

• MCBs are designed to protect electrical circuits and appliances from damage caused by excessive current.

• They are compact in size and can be easily i...read more
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Q6. What is timer what do work
Ans. 
A timer is a device that measures and controls the passage of time.
• A timer is used to initiate or stop a process at a specific time or after a specific duration.

• Timers can be mechanical or electronic.

• They are commonly used in various applications such as appliances, industrial machinery, and automation systems.

• Examples of timers include kitchen timers, programmable thermostats, and countdown timers in sports events.
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Q7. What is VFD
Ans. 
VFD stands for Variable Frequency Drive.
• VFD is an electronic device used to control the speed and torque of an electric motor.

• It adjusts the frequency and voltage supplied to the motor, allowing for precise control of motor speed.

• VFDs are commonly used in industrial applications to save energy, improve motor performance, and enable soft starting and stopping.

• They are also known as AC drives, adjustable speed drives, or...read more
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Q8. What is PLC what do work
Ans. 
PLC stands for Programmable Logic Controller. It is a digital computer used for automation of electromechanical processes.
• PLC is a specialized computer designed to control industrial processes.

• It uses a programmable memory to store instructions and execute them in a sequential manner.

• PLCs are commonly used in manufacturing plants, power stations, and other industrial settings.

• They can be programmed to control various d...read more
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Q9. What is ac motor
Ans. 
An AC motor is a type of electric motor that operates on alternating current.
• AC motor stands for alternating current motor.

• It converts electrical energy into mechanical energy.

• AC motors are commonly used in household appliances, industrial machinery, and vehicles.

• They are more efficient and require less maintenance compared to DC motors.

• Examples of AC motors include induction motors, synchronous motors, and brushless m
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Q10. What is rectifier
Ans. 
A rectifier is an electrical device that converts alternating current (AC) to direct current (DC).
• Rectifiers are commonly used in power supplies to convert AC voltage to DC voltage.

• They are made up of diodes, which allow current to flow in only one direction.

• Rectifiers can be half-wave or full-wave, depending on the number of diodes used.

• Examples of rectifiers include bridge rectifiers, vacuum tube rectifiers, and soli
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Q11. What is. diode
Ans. 
A diode is an electronic component that allows current to flow in one direction and blocks it in the opposite direction.
• Diodes are commonly used in rectifier circuits to convert AC to DC.

• They have two terminals: an anode (positive) and a cathode (negative).

• When the voltage across a diode is forward-biased, it allows current to flow.

• When the voltage is reverse-biased, it blocks the current.

• Diodes are often used for volt...read more
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Q12. What is plc working
Ans. 
PLC stands for Programmable Logic Controller. It is a digital computer used for automation of electromechanical processes.
• PLC is used to control and monitor industrial processes.

• It is programmed using ladder logic or other programming languages.

• PLCs are commonly used in manufacturing, power plants, and transportation systems.

• They can be used to control motors, valves, sensors, and other devices.

• PLCs provide real-time m...read more
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Q13. What is timer
Ans. 
A timer is a device or software that measures and controls the passage of time.
• A timer can be a physical device with buttons and a display, or it can be a software program on a computer or smartphone.

• Timers are commonly used in various applications such as cooking, sports, and industrial processes.

• They can be set to count down from a specific time or count up from zero.

• Some timers have additional features like alarms, ...read more
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Q1. What is the use of lubricant in roling mill
Ans. 
Lubricant in rolling mills reduces friction between metal surfaces, prevents wear and tear, and improves efficiency.
• Lubricant reduces friction between metal surfaces in rolling mills

• Prevents wear and tear on machinery

• Improves efficiency by reducing energy consumption

• Helps in cooling the metal during the rolling process

• Examples: oil-based lubricants, grease, graphite-based lubricants
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Q2. What are the major cause of roll broken
Ans. 
The major causes of roll breakage in maintenance engineering include material defects, improper setup, excessive tension, and foreign objects.
• Material defects such as weak spots or impurities can weaken the roll and lead to breakage.

• Improper setup or alignment of the roll can cause uneven stress distribution and eventual breakage.

• Excessive tension on the roll can exceed its load-bearing capacity and cause it to break.

• F...read more
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Q3. What is cause of rolling mill bearing broken
Ans. 
The main causes of rolling mill bearing breakage are lack of lubrication, contamination, overloading, and misalignment.
• Lack of lubrication can lead to increased friction and heat generation, causing the bearing to fail prematurely.

• Contamination from dirt, debris, or water can accelerate wear and tear on the bearing surfaces.

• Overloading the bearing beyond its capacity can cause excessive stress and lead to failure.

• Misal...read more
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Q4. Compressor overhead cause
Ans. 
Compressor overhead cause can be due to various factors such as high discharge pressure, low suction pressure, dirty filters, or worn out components.
• High discharge pressure can lead to overheating of the compressor.

• Low suction pressure can cause the compressor to work harder and overheat.

• Dirty filters can restrict airflow and cause the compressor to overheat.

• Worn out components such as valves or seals can lead to ineff
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Q5. How to measure wire rope condition
Ans. 
Wire rope condition can be measured by visual inspection, non-destructive testing, and load testing.
• Visual inspection for signs of wear, corrosion, broken wires, and distortion

• Non-destructive testing methods like magnetic particle inspection, ultrasonic testing, and dye penetrant testing

• Load testing to assess the strength and integrity of the wire rope under working conditions
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Q6. Lubricant chemicals property
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Common aptitude test

Q1. Electrical technical questions
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Q1. Personal details
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Q1. By Carefully seeing your Resume " What is your family Background?"
Ans. Sir, I am only son of my father. we are 3 member in family and one uncle.
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Q2. What are manufacturing process for producing a component?
Ans. 
The manufacturing process for producing a component involves several steps.
• Designing the component

• Material selection

• Machining or forming the raw material

• Assembly of the component

• Quality control and inspection
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Q3. 1. Casting 2.Machining 3.Forming 4.Deep Drawing etc....
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Q1. Personal Interview
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Q1. Related to rolling mill
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Q1. Regrading yourself and regrading curr ctc and exp. Ctc
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Q1. What is 7qc tool and Regrading mttr, mtbf, and some question releted to types of breakdown types of failure and how can reduce mttr.
Ans. 
7QC tools are quality control tools used to identify and solve quality-related issues. MTTR stands for Mean Time To Repair, MTBF stands for Mean Time Between Failures.
• 7QC tools include Pareto analysis, cause-and-effect diagram, scatter diagram, etc.

• MTTR is the average time taken to repair a failed component or system.

• MTBF is the average time between failures of a component or system.

• Types of breakdowns can include mech...read more
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Q1. Total hydraulic Cylinders in CCM machine
Ans. 
The total number of hydraulic cylinders in a CCM machine varies depending on the specific model and design.
• The number of hydraulic cylinders in a CCM machine can range from 4 to 12 or more, depending on the size and complexity of the machine.

• Each hydraulic cylinder in a CCM machine serves a specific function, such as controlling the movement of the mold or applying pressure to the molten metal.

• The hydraulic cylinders i...read more
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Q2. EOT crane Main Hoist brake setting
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Q3. Reason of Crane wheel wear
Ans. 
Crane wheel wear is caused by factors such as overloading, misalignment, lack of lubrication, and poor maintenance.
• Overloading the crane beyond its capacity can cause excessive wear on the wheels.

• Misalignment of the crane wheels can lead to uneven wear and premature failure.

• Lack of proper lubrication can increase friction and wear on the wheels.

• Poor maintenance practices, such as not regularly inspecting and replacing
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Q4. Limits used in EOT crane
Ans. 
Limits used in EOT crane include overload limit, travel limit, and height limit.
• Overload limit prevents the crane from lifting loads beyond its capacity

• Travel limit restricts the crane's movement within a specified range

• Height limit ensures the crane does not exceed the maximum height for safe operation
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Q1. Mechanical Rolling Mill Related question.
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Q1. Question related to quality
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