SN Joshi Consultants Hvac Engineer Interview Questions and Answers

Q1. Java hash map and how it works
Ans. 
Java hash map is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values based on keys.
• HashMap in Java implements the Map interface and allows null keys and values.

• It uses hashing to store and retrieve key-value pairs, providing O(1) time complexity for get() and put() operations.

• Example: HashMap map = new HashMap<>(); map.put("key", 1); int value = map.get("key");
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Q1. What are different IS codes? Explain each IS code
Ans. 
IS codes are Indian Standards codes used for standardization of products, processes, and services.
• IS 456:2000 - Code of practice for plain and reinforced concrete

• IS 2062:2011 - Specification of steel for general structural purposes

• IS 800:2007 - Code of practice for general construction in steel

• IS 1343:2012 - Code of practice for prestressed concrete

• IS 1200:Part 1:1992 - Method of measurement of building and civil engin...read more
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Q2. Explain load cases for Qualification in STAAD
Ans. 
Load cases in STAAD are used for qualification purposes to ensure structural safety.
• Load cases are combinations of loads that a structure may experience during its lifetime.

• Qualification load cases are used to ensure that the structure can withstand the maximum expected loads.

• Examples of load cases include dead load, live load, wind load, seismic load, and temperature load.

• Each load case is analyzed separately to deter...read more
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Q3. Explain stiffness value
Ans. 
Stiffness value refers to the resistance of an object to deformation under an applied force.
• Stiffness is a measure of how much force is required to deform an object.

• It is often used in engineering to describe the rigidity of a material or structure.

• Stiffness can be calculated using Hooke's Law, which states that the force required to deform an object is proportional to the displacement.

• For example, a steel beam is stif...read more
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Q1. Based on your previous work.
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Q1. Previous Employment Details
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Q1. A test conducted online mode
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Hacker Rank test with medium difficulty

Q1. Technical discussion mainly around system design, different architectures, problem solving and coding question may be asked.
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A case study for a problem statement

Q1. What is Surging?
Ans. 
Surging is a phenomenon in which a system experiences rapid and temporary increases in pressure or flow rate.
• Surging can occur in various systems such as pipelines, compressors, pumps, and turbines.

• It is often caused by sudden changes in demand, equipment malfunctions, or improper system design.

• Surging can lead to damage to equipment, reduced efficiency, and safety hazards.

• Examples include water hammer in pipelines and
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Q2. What is Froude No?
Ans. 
Froude number is a dimensionless number used to quantify the influence of gravity on fluid flow.
• Froude number is defined as the ratio of inertia force to gravitational force in a fluid flow.

• It is used to determine the type of flow (subcritical, critical, or supercritical) in open channel flow.

• Froude number is calculated as Fr = V / sqrt(g * d), where V is velocity, g is acceleration due to gravity, and d is depth of fl
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Q3. What is Weeping?
Ans. 
Weeping is the process of fluid leaking out of a solid material, often due to damage or excess moisture.
• Weeping can occur in materials such as wood, concrete, and metal.

• It is often a sign of structural damage or deterioration.

• Examples include water weeping from a crack in a wall or oil weeping from a car engine.

• Weeping can also refer to the shedding of tears in humans and animals.
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Q1. Draw basic PFD of a WTP plant including feed quality and all the sensors.
Ans. 
A basic PFD of a WTP plant including feed quality and sensors.
• Include feed quality parameters such as turbidity, pH, temperature, and flow rate

• Include sensors for monitoring parameters like chlorine levels, pressure, and conductivity

• Show the flow of water through various treatment processes like coagulation, flocculation, sedimentation, filtration, and disinfection
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Q2. What are the process checks done in Line testing of a 6inch dia pigging line including the calculations involved?
Ans. 
Process checks in line testing of a 6inch dia pigging line and associated calculations
• Pressure testing to ensure integrity of the line

• Flow testing to check for blockages or restrictions

• Calibration of pigging equipment for accurate results

• Calculations involve pressure drop, flow rate, and pigging efficiency

• Recording and analyzing data for future reference
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Q1. Why do u qant to leave ur previous company?
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Q2. How do u solve a matter of conflict during a Project meeting?
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Q1. What are your salary expectations?
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Q2. What is your family background?
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Q1. Technical round - depends on your sector and manager . Else no technical questions. Ready to travel . Married or not . Over...
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Q1. Question regarding pile foundation, what is the density of bentonite
Ans. The density of the freshly prepared bentonite suspension shall be between 1.03 and 1.10 g/ml and before concrete is 1.12g/ml
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Q2. Question regarding well foundation. what is the rate of sinking well in your site
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Q1. What are your salary expectations?
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Q2. Why should we hire you?
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Q3. What is your family background?
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Q4. Where do you see yourself in 5 years?
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Q5. Tell me about yourself.
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Q1. How do you troubleshoot outlook?
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