Alstom Transportation Process Control Engineer Interview Questions and Answers

It was quite easy, basic quant and analytical aptitude. Questions were also asked from your core sector, which are manageable.

Group of 5 members were formed and current topics were discussed

Q1. Explain Heat duty of heat echanger
Ans. 
Heat duty of a heat exchanger refers to the amount of heat transferred between the hot and cold fluids.
• Heat duty is the heat transfer rate or the amount of heat energy transferred per unit time.

• It is calculated by multiplying the mass flow rate of the fluid by the specific heat capacity and the temperature difference between the hot and cold fluids.

• The heat duty determines the size and design of the heat exchanger.

• For ...read more
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Q2. What is bernoullis principle
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Bernoulli's principle states that as the speed of a fluid increases, its pressure decreases.
• Bernoulli's principle relates to the conservation of energy in fluid flow.

• It states that as the speed of a fluid increases, its pressure decreases.

• This principle is applicable to various fluid dynamics phenomena, such as airflow over an airplane wing or water flow through a pipe.

• It explains how an airplane wing generates lift by...read more
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Q3. Explain grashoff number
Ans. 
The Grashoff number is a dimensionless number used in fluid dynamics to determine the dominance of buoyancy forces over viscous forces in a fluid flow.
• The Grashoff number is defined as the product of the ratio of buoyancy forces to viscous forces and the square of the ratio of characteristic length to kinematic viscosity.

• It is used to analyze natural convection flows and is particularly important in heat transfer appli...read more
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Q4. Design part of pumps
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Designing parts of pumps involves creating components that enable the pump to function effectively.
• Identify the specific requirements of the pump design

• Select appropriate materials for the pump parts

• Design components such as impellers, casings, and seals

• Consider factors like fluid properties, pressure, and temperature

• Ensure proper alignment and fit of the pump parts

• Use CAD software for creating detailed designs

• Perform ...read more
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Q5. Design ofdistillationcoloumns
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Design of distillation columns
• Distillation columns are used to separate mixtures of liquids based on their boiling points

• The design of a distillation column involves determining the number of trays or packing, column diameter, and reflux ratio

• The design is influenced by factors such as the desired separation efficiency, feed composition, and operating pressure

• Different types of distillation columns include packed colum...read more
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Q1. Do you prefer working independently or as part of a team?
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Q2. Which values help you meet deadlines when working as part of a team?
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Q1. How to make p&ID and perform line Sizing
Ans. 
P&ID is made by identifying process equipment and connecting them with pipes. Line sizing is done based on process requirements.
• Identify process equipment and their connections

• Determine process requirements such as flow rate and pressure drop

• Select appropriate pipe size based on process requirements

• Consider factors such as fluid properties, pipe material, and layout

• Use software tools such as AutoCAD or SmartPlant P&ID
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Q1. Pumps, line and hydrualics
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Q1. PSV types and their selection
Ans. 
Different types of Pressure Safety Valves (PSVs) and factors to consider when selecting them
• Types of PSVs include conventional, balanced bellows, pilot-operated, and rupture disc

• Factors to consider when selecting a PSV include set pressure, relieving capacity, back pressure, and operating temperature

• Conventional PSVs are commonly used for low to medium pressure applications, while pilot-operated PSVs are suitable for h...read more
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Q2. P&IDS, PFDS, HMB, SIMULATION
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Q1. Draw P&ID of Pump System
Ans. 
P&ID of Pump System shows the piping, equipment, instrumentation, and control interlocks of the system.
• Include pump symbol with arrows indicating flow direction

• Label all equipment such as pumps, valves, tanks, etc.

• Show instrumentation like pressure gauges, flow meters, etc.

• Indicate control interlocks and safety features

• Use standard symbols and colors as per industry guidelines
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Q2. What is npsh available
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NPSH available stands for Net Positive Suction Head available, which is a measure of the absolute pressure at the suction port of a pump.
• NPSH available is the total suction head in feet absolute at the suction nozzle of the pump.

• It is important for ensuring that the pump does not cavitate, which can cause damage to the pump and decrease efficiency.

• NPSH available is calculated by subtracting the vapor pressure of the li...read more
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Q3. How to calculate NPSH
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NPSH is calculated by subtracting the vapor pressure of the liquid from the total head of the pump.
• NPSH = H - (Pv / rho * g)

• H is the total head of the pump

• Pv is the vapor pressure of the liquid

• rho is the density of the liquid

• g is the acceleration due to gravity

• Ensure all units are consistent (e.g. meters, Pascal, kg/m^3, m/s^2)
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Q4. Draw two phase system p&ID
Ans. 
A two-phase system P&ID shows the process flow of a system with two distinct phases.
• Identify the two phases involved in the system (e.g. liquid-gas, solid-liquid).

• Use different symbols to represent each phase on the P&ID.

• Show the flow direction and connections between components in the system.

• Include labels and legends to explain the components and their functions.

• Ensure clarity and consistency in the representation of
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