Coal India Interview Questions, Process, and Tips

Q1. Calculate power factor in single phase and 3-phase circuits and what precaution to take to improve power factor.
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Q2. Only technical, what is power factor in 3-phase circuits.
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Q1. What is substation use equipment
Ans. 
Substation use equipment refers to the various devices and tools used in a substation for power distribution and maintenance.
• Substation transformers

• Circuit breakers

• Disconnect switches

• Voltage regulators

• Capacitor banks

• Protective relays
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Q2. What is electricity
Ans. 
Electricity is the flow of electric charge through a conductor.
• Electricity is the flow of electrons through a conductor

• It is a form of energy that powers electrical devices

• Electricity can be generated from various sources such as coal, wind, solar, and hydro

• It is measured in units of volts, amps, and watts
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Q3. What is induction motor and functions
Ans. 
An induction motor is a type of AC motor that works on the principle of electromagnetic induction to convert electrical energy into mechanical energy.
• Induction motors are commonly used in various industrial applications due to their simplicity, reliability, and low cost.

• They consist of a stator (stationary part) and a rotor (rotating part) where the rotor is not connected to an external power source.

• When an alternating...read more
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Q4. What is generator and functions
Ans. 
A generator is a device that converts mechanical energy into electrical energy. It functions by rotating a coil of wire within a magnetic field to produce electricity.
• Generates electricity by converting mechanical energy into electrical energy

• Consists of a coil of wire rotating within a magnetic field

• Used in power plants, backup generators, and portable generators
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Q5. What is Transformers this function
Ans. 
Transformers function to change voltage levels in electrical systems.
• Transformers increase or decrease voltage levels in electrical systems

• Step-up transformers increase voltage for long-distance transmission

• Step-down transformers decrease voltage for distribution to homes and businesses

• Transformers help maintain power quality and efficiency in electrical grids
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Q1. Heavy Earth moving machine
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Q2. Rear dumper is very powerful machine
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Q1. What is a safety
Ans. 
Safety is the practice of ensuring that people, equipment, and the environment are protected from harm or danger.
• Safety involves following rules and procedures to prevent accidents and injuries

• It includes wearing appropriate protective gear, such as helmets or safety vests

• Regular maintenance of equipment and machinery is essential for safety

• Safety also involves being aware of potential hazards and taking steps to mitig...read more
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Q2. What is hydraulic system
Ans. 
A hydraulic system is a technology that uses liquid to transmit force and energy.
• Uses incompressible fluid to generate power

• Consists of hydraulic fluid, pump, valves, cylinders, and motors

• Commonly used in heavy machinery like dump trucks and excavators
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It was quiet detailed

Q1. Why Coal India?
Ans. 
Coal India is the largest coal-producing company in the world, with a strong market presence and growth potential.
• Coal India has a dominant position in the coal industry, accounting for over 80% of India's coal production.

• The company has a vast reserve base and a strong distribution network, ensuring a steady supply of coal to meet market demand.

• Coal India has a history of consistent growth and profitability, making it...read more
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Q2. How can you add value from your previous exp?
Ans. 
I can add value from my previous experience by implementing successful marketing strategies, analyzing market trends, and building strong relationships with clients.
• Implemented successful marketing strategies to increase sales by 20% in my previous role

• Analyzed market trends to identify new opportunities for product development

• Built strong relationships with clients resulting in a 30% increase in customer retention
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