L&T Construction Process Engineer Interview Questions and Answers

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
Ans. 
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
Ans. 
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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Q1. What are types of psv
Ans. 
Types of PSV include conventional spring-loaded PSV, pilot-operated PSV, balanced bellows PSV, and rupture disc PSV.
• Conventional spring-loaded PSV

• Pilot-operated PSV

• Balanced bellows PSV

• Rupture disc PSV
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Q2. What are heat exchanger types
Ans. 
Heat exchanger types include shell and tube, plate, finned tube, and double pipe.
• Shell and tube heat exchanger

• Plate heat exchanger

• Finned tube heat exchanger

• Double pipe heat exchanger
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Q1. Past experience question...
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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
Answered by AI
Add your answer
Q2. What is npsh available
Ans. 
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
Answered by AI
View 1 more answer
Q3. How to calculate NPSH
Ans. 
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)
Answered by AI
Add your answer
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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Normal level English grammer and General Maths

Q1. Normal and easy
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Q2. Tell me about yourself
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Q3. Strength and warkness
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Q4. About Insurance
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Q1. Tell me about Yourself
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Q1. What are types of psv
Ans. 
Types of PSV include conventional spring-loaded PSV, pilot-operated PSV, balanced bellows PSV, and rupture disc PSV.
• Conventional spring-loaded PSV

• Pilot-operated PSV

• Balanced bellows PSV

• Rupture disc PSV
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Q2. What are heat exchanger types
Ans. 
Heat exchanger types include shell and tube, plate, finned tube, and double pipe.
• Shell and tube heat exchanger

• Plate heat exchanger

• Finned tube heat exchanger

• Double pipe heat exchanger
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Q1. Past experience question...
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Aptitude test is the choosing the correct answer to our qualification questions .
This test is a finding the candidates
education knowledge.

Q1. What is the Vernier caliper least count?
Ans. 
The Vernier caliper least count is the smallest measurement that can be read on the caliper scale.
• The least count of a Vernier caliper is determined by the number of divisions on the main scale and the Vernier scale.

• It is calculated by dividing the smallest division on the main scale by the total number of divisions on the Vernier scale.

• For example, if the smallest division on the main scale is 0.1 mm and the total num...read more
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Q2. What is stress and strain comparision?
Ans. 
Stress and strain are related concepts in materials science and engineering.
• Stress is the force applied to a material per unit area, causing deformation.

• Strain is the measure of the deformation or change in shape of a material due to stress.

• Stress and strain are directly proportional within the elastic limit of a material.

• Stress is measured in units of force per unit area (such as N/m² or Pa).

• Strain is a dimensionless ...read more
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Q3. How many defects will come in GI Process after dipping?
Ans. 
The number of defects in GI process after dipping depends on various factors and cannot be determined without proper analysis.
• The type and quality of the material being dipped

• The temperature and duration of the dipping process

• The quality of the coating material being used

• The skill and experience of the workers involved in the process

• The quality control measures in place to detect and prevent defects

• Defects can range fr...read more
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Q4. What is error proof in automobile manufacturing?
Ans. 
Error proofing in automobile manufacturing refers to the implementation of measures to prevent or detect errors and defects in the production process.
• Error proofing involves designing processes and systems that minimize the likelihood of errors or defects occurring.

• It includes the use of tools, techniques, and technologies to identify and eliminate potential sources of errors.

• Examples of error proofing in automobile ma...read more
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Q5. Difference b/w 2stroke and 4 stroke comparison?
Ans. 
2-stroke engines have a power stroke every revolution, while 4-stroke engines have a power stroke every other revolution.
• 2-stroke engines have a simpler design and are lighter than 4-stroke engines.

• 2-stroke engines have a higher power-to-weight ratio than 4-stroke engines.

• 4-stroke engines are more fuel-efficient and have a longer lifespan than 2-stroke engines.

• 2-stroke engines are commonly used in small power tools and...read more
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