NTPC-Sail Power Company Interview Questions and Answers

Q1. Difarance between MCC and PCC
Ans. 
MCC stands for Motor Control Center and is used for controlling motors, while PCC stands for Power Control Center and is used for controlling power distribution.
• MCC is used for controlling motors, while PCC is used for controlling power distribution.

• MCC typically contains motor starters, drives, and control devices, while PCC contains circuit breakers, switches, and other power distribution components.

• MCC is usually lo...read more
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Q2. OLR seting value?
Ans. 
OLR setting value refers to the setting of the Overload Relay in an electrical system.
• OLR setting value is the threshold at which the Overload Relay will trip and disconnect the circuit to protect the equipment from damage.

• It is typically set based on the maximum current that the equipment can safely handle.

• The OLR setting value can be adjusted based on the specific requirements of the equipment and the application.

• For...read more
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Q3. Motor and modul checking proess
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Q4. Brassless excitation system
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Q1. Why Earthing use in electrical equipments? Difference between 3 Phase 1 phase erthing
Ans. 
Earthing ensures safety by preventing electric shock and equipment damage. Differences exist between single-phase and three-phase earthing.
• Earthing provides a safe path for fault currents, reducing the risk of electric shock.

• In single-phase systems, earthing typically involves one phase and neutral, while three-phase systems require earthing for all three phases.

• Three-phase earthing can handle higher loads and provides...read more
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Q2. Mustter trip coil code ?
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A Mustter trip coil code is essential for understanding electrical circuit protection and control mechanisms.
• Trip coils are used in circuit breakers to interrupt the circuit during faults.

• The Mustter trip coil code specifies the operational characteristics of the coil.

• For example, a code might indicate the voltage rating and response time of the coil.

• Understanding the code helps in selecting the right coil for specific...read more
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Q3. Battery Ah
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Q4. Generator protection type realy A ??
Ans. 
Generator protection relays safeguard generators from faults and abnormal conditions, ensuring reliability and safety in power systems.
• Overcurrent Relay: Protects against excessive current, e.g., during short circuits.

• Differential Relay: Detects differences in current between generator terminals, indicating faults.

• Under/Over Voltage Relay: Monitors voltage levels to prevent damage from voltage fluctuations.

• Frequency Re...read more
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Q1. Are you relocate your home town ?
Ans. 
Yes, I am open to relocating for the right opportunity to advance my career and contribute effectively to the team.
• Relocation can provide new challenges and experiences that enhance my skills.

• I have previously relocated for work, which helped me grow professionally and personally.

• Being adaptable to new environments is crucial in the electrical maintenance field.

• I am excited about the possibility of working in different...read more
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Q1. DEFINE THERMODYNAMIC CYCLE
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A thermodynamic cycle is a series of processes that involve the transfer of heat and work to and from a system.
• A thermodynamic cycle consists of a series of processes such as compression, heating, expansion, and cooling.

• The cycle returns the working substance to its original state after completing a full cycle.

• Examples of thermodynamic cycles include the Carnot cycle, Rankine cycle, and Brayton cycle.
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Q1. Define rankine cycle and it's function
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Rankine cycle is a thermodynamic cycle used in power plants to convert heat into mechanical work.
• Rankine cycle is a thermodynamic cycle that converts heat into mechanical work.

• It is commonly used in power plants to generate electricity.

• The cycle consists of four main components: a boiler, turbine, condenser, and pump.

• Steam is generated in the boiler by heating water using a fuel source.

• The steam then enters the turbine...read more
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Q1. Boiler functions?
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Boilers generate steam for power and heating, utilizing fuel combustion to convert water into steam efficiently.
• Heat Generation: Boilers burn fuel (like coal, gas, or oil) to produce heat.

• Steam Production: The heat converts water into steam, which can be used for power generation.

• Pressure Control: Boilers maintain steam pressure for efficient operation, crucial in power plants.

• Safety Mechanisms: Equipped with safety va...read more
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