Power Grid Corporation of India Senior Engineer- Maintenance Interview Questions and Answers

First round is a passed to aptitude test after then you are qualified to a 2nd round.

Second round you passed to group discussion after you qualified to face to face interview.

Q1. Describe the half wave and full wave rectifier
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Q2. Working process of cyloconverter
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Q1. Why we can't more efficiency in Boiler
Ans. 
Efficiency in boilers is limited due to various factors.
• Incomplete combustion of fuel leads to energy loss

• Heat loss through flue gases and radiation

• Inefficient heat transfer due to scaling or fouling

• Improper insulation leading to heat loss

• Inadequate maintenance and tuning

• Lack of advanced control systems

• Design limitations and constraints

• Fuel quality and composition

• Operating conditions and load variations
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Q2. Why Turbine,s efficiency is less & so derive the efficiency equation
Ans. 
The efficiency of a turbine is less due to various factors such as friction, heat losses, and mechanical losses.
• Friction between the moving parts of the turbine reduces its efficiency.

• Heat losses occur due to the conversion of thermal energy into mechanical energy.

• Mechanical losses include losses in bearings, seals, and other components.

• Efficiency equation: Efficiency = (Useful output energy / Input energy) * 100%
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Q1. Boiler Operation
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Q2. Coal Mill Boiler Pressure Parts APH
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Q1. Hydraulic. Pneumatic
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Q2. Pump. gearbox . Bearings
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Question related to electrical and mental ability

Q1. Tell me about your self, what is transformer, Tell me about your BE Project, What is resistance, capacitor, Generator And so on
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Q2. What is transformer
Ans. 
A transformer is an electrical 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.

• They consist of two coils of wire, known as the primary and secondary coils, wrapped around a core.

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

• Transf...read more
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Q3. What is resistance
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Resistance is the opposition to the flow of electric current.
• Resistance is measured in ohms (Ω).

• It is caused by the collisions of electrons with atoms in a conductor.

• Higher resistance leads to lower current flow.

• Resistance can be affected by factors like material, length, and temperature.

• Examples of high resistance materials include rubber and glass.

• Examples of low resistance materials include copper and silver.
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Q4. What is generator
Ans. 
A generator is a device that converts mechanical energy into electrical energy.
• Generators are commonly used in power plants to generate electricity

• They can also be used as backup power sources in case of power outages

• Generators can be powered by various sources such as gasoline, diesel, natural gas, or renewable energy sources like wind or solar

• They work on the principle of electromagnetic induction
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Q5. What is capacitor
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A capacitor is an electronic component that stores and releases electrical energy in a circuit.
• Capacitors are used to filter out noise in electronic circuits.

• They can also be used to store energy in flash cameras.

• Capacitors are measured in farads, with smaller values denoted in microfarads or picofarads.
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Q1. My job related ask any questions
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