NTPC GE Power Services Mechanical Engineer Interview Questions and Answers

Q1. Tell me about yourself?
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Q2. One of the biggest Achivement?
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One of my biggest achievements was successfully leading a team to complete a complex project ahead of schedule and under budget.
• Led a team to complete a complex project ahead of schedule

• Managed resources effectively to stay under budget

• Received recognition for successful project completion
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Q1. Tell me about refrigeration cycle
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Refrigeration cycle is a process in which a refrigerant absorbs heat from a low-temperature space and rejects it in a high-temperature space.
• The refrigeration cycle consists of four main components: compressor, condenser, expansion valve, and evaporator.

• The refrigerant starts as a low-pressure gas in the evaporator where it absorbs heat from the space being cooled.

• The compressor then compresses the refrigerant into a h...read more
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Q2. How work of four stroke cycle engine?
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Four stroke cycle engine works by completing four distinct processes - intake, compression, power, and exhaust strokes.
• Intake stroke: Air-fuel mixture is drawn into the cylinder as the piston moves downward.

• Compression stroke: The intake valve closes and the piston compresses the mixture, preparing it for ignition.

• Power stroke: The spark plug ignites the compressed mixture, causing an explosion that drives the piston d...read more
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Q3. How you handle when you set back?
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Q1. Engine relented question and preventive maintenance
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Q2. Technical issue gear box
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Area formula, SS MS Material information

Q1. Question about aptitude test
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Q1. About heat exchangers
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Q2. About columns and internals of columns
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Q1. Discussion about Salary
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Q2. About Future goals
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Q1. What is centrifugal pump?
Ans. 
A centrifugal pump is a mechanical device used to transport fluids by converting rotational kinetic energy into hydrodynamic energy.
• Centrifugal pumps are commonly used in various industries, including oil and gas, water treatment, and HVAC systems.

• They work by using an impeller to rotate and create a centrifugal force, which pushes the fluid towards the pump outlet.

• The fluid enters the pump through the suction inlet an...read more
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Q2. How many types of valve? What are they?
Ans. 
There are several types of valves used in mechanical systems.
• Gate valve: used to control the flow of fluid by lifting or lowering a gate

• Ball valve: uses a ball to control the flow of fluid

• Butterfly valve: uses a disc to control the flow of fluid

• Check valve: allows fluid to flow in one direction only

• Globe valve: controls flow by raising or lowering a plug

• Needle valve: uses a long, tapered needle to control flow

• Diaphragm...read more
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Q3. Write about ball valve?
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A ball valve is a type of valve that uses a ball-shaped disc to control the flow of fluid through a pipe.
• Ball valves are commonly used in industrial applications for their durability and reliability.

• They have a simple design, consisting of a ball with a hole in the middle that can be rotated to control the flow of fluid.

• Ball valves can be either full port or reduced port, depending on the size of the ball and the hole.

• ...read more
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Q4. What is shell and tube heat exchanger?
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A shell and tube heat exchanger is a device used to transfer heat between two fluids.
• Consists of a shell (outer vessel) and tubes (inner vessels)

• One fluid flows through the tubes while the other flows around the tubes in the shell

• Heat is transferred from one fluid to the other through the tube walls

• Commonly used in industries such as power generation, chemical processing, and HVAC

• Example: Cooling water in a power plant
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Q5. How many types of heat exchanger? What are they?
Ans. 
There are several types of heat exchangers, including shell and tube, plate and frame, and finned tube.
• Shell and tube heat exchangers are the most common type and consist of a shell with tubes inside.

• Plate and frame heat exchangers use thin plates to transfer heat between fluids.

• Finned tube heat exchangers have tubes with fins attached to increase surface area for heat transfer.

• Other types include spiral, double pipe, ...read more
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Q6. What is that full form of PPE?
Ans. 
PPE stands for Personal Protective Equipment.
• PPE is equipment worn to minimize exposure to hazards that may cause serious workplace injuries or illnesses.

• Examples of PPE include safety glasses, gloves, hard hats, respirators, and safety shoes.

• PPE should be selected based on the specific hazards present in the workplace.

• Employers are responsible for providing PPE to their employees and ensuring that it is properly maint...read more
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Q7. What is axial flow pump?
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An axial flow pump is a type of pump that uses an impeller to create fluid flow parallel to the pump shaft.
• Axial flow pumps are commonly used in applications where large volumes of fluid need to be moved at low to medium pressures.

• They are often used in irrigation systems, drainage systems, and cooling systems.

• The impeller of an axial flow pump has blades that resemble a propeller, which helps in generating the axial f...read more
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Q8. Write about check valve?
Ans. 
A check valve is a mechanical device that allows fluid to flow in one direction only.
• Check valves are commonly used in plumbing systems to prevent backflow of water.

• They are also used in hydraulic systems to prevent reverse flow of fluid.

• Check valves can be classified into different types such as swing check valves, lift check valves, and ball check valves.

• These valves work by using a disc or a ball that opens and clos...read more
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Q9. Shortly explain about positive displacement pump?
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Positive displacement pump is a type of pump that moves fluid by trapping a fixed amount of it and then forcing it into the discharge pipe.
• Positive displacement pumps operate by trapping a specific volume of fluid and then forcing it into the discharge pipe.

• These pumps are capable of generating high pressures and are used in various industries such as oil and gas, chemical, and food processing.

• Examples of positive disp...read more
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Q10. What is globe valve?
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A globe valve is a type of valve used to regulate or stop the flow of fluid in a pipeline.
• It has a spherical body with an internal baffle that directs the flow of fluid.

• The valve can be opened or closed by rotating the stem.

• It provides a tight seal when closed, preventing leakage.

• Globe valves are commonly used in applications where throttling or regulating flow is required.

• They are often found in water systems, steam s
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Q11. What is PPE ? Give it explain?
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PPE stands for Personal Protective Equipment. It refers to protective clothing, helmets, goggles, or other equipment designed to protect the wearer's body from injury or infection.
• PPE is used in various industries to protect workers from hazards.

• Examples of PPE include safety glasses, gloves, hard hats, respirators, and earplugs.

• PPE should be selected based on the specific hazards present in the workplace.

• Proper traini...read more
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1 hour attitude test and questions are normally not tough enough

Q1. Just introduce ur self like normal questions Technical details of gear manufacturing
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Q2. How is basic mechanism of four wheeler running
Ans. 
A four wheeler runs by converting fuel into mechanical energy through a series of processes involving the engine, transmission, and wheels.
• Fuel is burned in the engine to create combustion, which generates power

• The power is transferred to the wheels through the transmission system

• The wheels rotate and propel the vehicle forward

• Brakes are used to slow down or stop the vehicle
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Q1. Question about exchanger
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Q2. Exchanger colums vessals heaters
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Q1. Exchanger colums heaters vessals
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Q2. Exchanger colums vessals heaters
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