ArcelorMittal Nippon Steel Hvac Technician Interview Questions and Answers

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Q1. Vernier scale reading?
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Q2. Micrometre reading?
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Q3. How I making alloy
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Alloys are made by combining two or more metals to create a new material with improved properties.
• Select the metals to be combined based on desired properties

• Melt the metals together in a furnace

• Mix the molten metals thoroughly

• Cool and solidify the mixture to form the alloy
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Q1. What is relay what do work
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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. Electrical maintenance related
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Q2. Transforamer maintenance
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Q3. Motor maintenance
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Q4. Pcc, mcc, pdb operation and maintenance
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Q5. Field instrument operation and maintenance
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Q1. File is made of
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Q2. Steel rule is a made of
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Q3. The point angle of scriber is
Ans. 
The point angle of scriber is the angle between the two cutting edges of the scriber.
• The point angle is typically between 30 and 60 degrees.

• It affects the sharpness and durability of the scriber.

• A larger point angle will result in a stronger but less sharp scriber.

• A smaller point angle will result in a sharper but less durable scriber.
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Q4. The point angle of centre punch
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The point angle of a centre punch is typically 90 degrees.
• The point angle is the angle between the two sides of the punch tip.

• A 90 degree point angle is the most common and versatile for general use.

• Different point angles can be used for specific applications, such as 60 degrees for softer materials.

• The point angle affects the size and shape of the indentation made by the punch.
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Q1. Bearing fittings Gearbox assembly
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Q2. Job requirment all equipment check
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Q3. So damage part ready prayority damage part change
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Q1. What are the energy conversion take place in centrifugal pumps?
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Energy conversion in centrifugal pumps involves mechanical energy being converted to kinetic energy and then to potential energy.
• Mechanical energy from the motor is converted to kinetic energy in the rotating impeller

• Kinetic energy is then converted to potential energy in the volute casing

• The potential energy is then used to increase the pressure and flow of the fluid being pumped

• Efficiency of the pump is crucial in mi
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Q2. What are the types of pump casing?
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Types of pump casing include volute, diffuser, axial flow, and mixed flow.
• Volute casing: spiral-shaped casing that increases the velocity of the fluid

• Diffuser casing: converts kinetic energy into pressure energy

• Axial flow casing: directs the flow of fluid parallel to the axis of rotation

• Mixed flow casing: combines features of both radial and axial flow casings
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Q1. Transformer maintenance
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Q2. Panel MCC PCC maintenance
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Q3. Motor maintenance
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Q1. Lighting maintenance
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Q2. HT breaker maintenance
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Q1. AC and DC both are dengerous but AC more dengerous
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Q2. AC and DC both are dengerous but AC sine vev AC dengerous
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Q3. RCB to tha circuit breaker
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Q1. MCB in circuit breaker
Ans. 
MCB stands for Miniature Circuit Breaker, which is an electrical switch designed to protect electrical circuits from damage caused by overload or short circuit.
• MCB is a type of circuit breaker that automatically switches off the electrical circuit when it detects an overload or short circuit.

• It is commonly used in residential and commercial buildings to protect electrical appliances and wiring.

• MCBs have a trip mechanis...read more
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