ENGIE Solutions Interview Questions, Process, and Tips

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Basic electrical questions

Q1. Transmission voltage level
Ans. 
Transmission voltage level refers to the voltage at which electricity is transmitted over long distances.
• Transmission voltage level is typically high to minimize power losses during transmission.

• Common transmission voltage levels include 69 kV, 138 kV, 230 kV, 345 kV, and 500 kV.

• Higher voltage levels require specialized equipment and infrastructure for transmission and distribution.

• Transmission voltage levels are deter...read more
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Q2. Transformers, and generator alternator working principle
Ans. 
Transformers and generator alternators are devices that convert electrical energy from one form to another.
• Transformers work on the principle of electromagnetic induction, where a changing current in one coil induces a voltage in another coil.

• They are used to step up or step down voltage levels in electrical power transmission and distribution systems.

• Generator alternators, also known as synchronous generators, convert...read more
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Q1. What is ACB in work method
Ans. 
ACB stands for Air Circuit Breaker, a type of circuit breaker used to protect electrical equipment from damage caused by short circuits and overloads.
• ACB is a type of circuit breaker that operates by air-blast.

• It is commonly used in low voltage power distribution systems.

• ACBs are designed to protect electrical equipment from damage caused by short circuits and overloads.

• They can be manually or automatically operated.

• AC...read more
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Q2. What Deferent to mcb and mccb
Ans. 
MCB and MCCB are both circuit breakers, but differ in their current rating and trip characteristics.
• MCB stands for Miniature Circuit Breaker and is used for low current applications up to 125A.

• MCCB stands for Molded Case Circuit Breaker and is used for higher current applications up to 2500A.

• MCBs have a fixed trip current rating and are designed to trip quickly in case of overload or short circuit.

• MCCBs have adjustable...read more
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Q3. Explain HVAC equipment
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HVAC equipment refers to the heating, ventilation, and air conditioning systems used in buildings to maintain a comfortable indoor environment.
• HVAC equipment includes furnaces, air conditioners, heat pumps, boilers, and ventilation systems.

• These systems work together to regulate temperature, humidity, and air quality.

• For example, a furnace heats air that is then distributed throughout a building via ductwork.

• An air con...read more
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Q4. What R22 discharge in section pressure
Ans. 
The R22 discharge pressure in the section is determined by various factors.
• The R22 discharge pressure depends on the operating conditions of the system.

• It is influenced by factors such as the compressor capacity, condenser performance, and evaporator load.

• The discharge pressure is typically measured in pounds per square inch (psi) or kilopascals (kPa).

• Higher discharge pressures may indicate issues such as a clogged con...read more
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Q5. What is condensation in ac
Ans. 
Condensation in AC is the process of converting water vapor into liquid form due to cooling of air.
• Occurs when warm, humid air comes in contact with a cold surface

• Can cause water droplets to form on AC vents or windows

• Can be prevented by proper insulation and ventilation

• Can lead to mold growth if not addressed

• Can be a sign of an AC unit that is too large for the space it is cooling
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Q6. What is the power factor
Ans. 
Power factor is the ratio of real power to apparent power in an AC circuit.
• It is a measure of how efficiently power is being used in a circuit.

• It ranges from 0 to 1, with 1 being the most efficient.

• A low power factor can result in higher energy costs and equipment damage.

• Capacitors can be used to improve power factor.

• Power factor is important in industries where large amounts of power are used, such as manufacturing pl
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Q7. What is ACB circuit breaker
Ans. 
ACB circuit breaker stands for Air Circuit Breaker which is used to protect electrical circuits from overloads and short circuits.
• ACB circuit breaker is a type of circuit breaker that uses air as the medium to extinguish the arc formed during the interruption of the current flow.

• It is commonly used in low voltage power distribution systems.

• It can be manually or automatically operated.

• It provides protection against over...read more
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Q8. What is a vcb circuit breaker
Ans. 
A VCB circuit breaker is a type of circuit breaker that uses a vacuum interrupter to extinguish the arc when the contacts separate.
• VCB stands for Vacuum Circuit Breaker.

• It is commonly used in medium voltage electrical systems.

• The vacuum interrupter inside the VCB is a sealed-off chamber containing a vacuum.

• When the contacts of the circuit breaker separate, the vacuum interrupter extinguishes the arc that forms between ...read more
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Q9. What is rccb different rccb and mcb
Ans. 
RCCB is a residual current circuit breaker while MCB is a miniature circuit breaker.
• RCCB is used to protect against earth leakage current while MCB is used to protect against overcurrent.

• RCCB trips when there is a difference between the incoming and outgoing current while MCB trips when there is an overload or short circuit.

• RCCB has a higher sensitivity than MCB.

• RCCB is used in areas where there is a higher risk of ele...read more
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Q10. What is transformer safety
Ans. 
Transformer safety refers to the measures taken to ensure the safe operation and maintenance of transformers.
• Proper grounding and insulation

• Regular maintenance and inspection

• Use of protective equipment

• Adherence to safety regulations and guidelines

• Awareness of potential hazards such as electrical shock and fire

• Emergency response planning

• Training and education for personnel

• Example: Use of personal protective equipment su...read more
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Q11. What is ACB safety what is ACB safety
Ans. 
ACB safety refers to the safety measures taken while handling Air Circuit Breakers.
• ACB safety involves proper installation, maintenance, and operation of the breaker.

• It is important to follow manufacturer's instructions and safety guidelines.

• ACB safety also includes using appropriate personal protective equipment (PPE) while working with the breaker.

• Examples of PPE include gloves, safety glasses, and protective clothin...read more
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Q12. What is a generator safety
Ans. 
Generator safety refers to the measures taken to ensure safe operation and maintenance of generators.
• Proper grounding of the generator

• Regular maintenance and inspection

• Use of appropriate fuel and lubricants

• Proper ventilation to prevent carbon monoxide poisoning

• Keeping the generator away from flammable materials

• Following manufacturer's instructions

• Using appropriate personal protective equipment

• Ensuring proper storage an...read more
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Q13. 410A discharges and section gas's pressure
Ans. 
410A discharges at a higher pressure than R22 and requires a different type of compressor.
• 410A has a higher discharge pressure than R22

• 410A requires a different type of compressor due to its higher pressure

• Section gas pressure refers to the pressure of the refrigerant in the suction line

• Proper pressure readings are important for system efficiency and performance
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