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Blue Star Mechanical Engineer Interview Questions and Answers
7 Interview questions
IDU and ODU are abbreviations used in air conditioning systems. IDU stands for Indoor Unit and ODU stands for Outdoor Unit.
IDU is the unit that is installed inside the room or building, while ODU is installed outside.
IDU is responsible for cooling or heating the air inside the room, while ODU is responsible for dissipating the heat outside.
IDU is connected to ODU through refrigerant pipes and electrical cables.
Exa...
AC is a device that cools and dehumidifies air while cooler is a device that cools water or other liquids.
AC is used to cool and dehumidify air in a room or building
Cooler is used to cool water or other liquids for drinking or industrial purposes
AC uses refrigerant to cool the air while cooler uses water or other liquids
AC is more expensive and complex than cooler
AC is more commonly used in residential and commerc...
P,V and T,S diagrams are graphical representations of thermodynamic processes.
P,V diagram shows the relationship between pressure and volume.
T,S diagram shows the relationship between temperature and entropy.
P,V and T,S diagrams are useful in analyzing thermodynamic cycles.
P,V and T,S diagrams can be used to determine the efficiency of a heat engine.
P,V and T,S diagrams are commonly used in the design of power pla...
Diesel engines are commonly used in trains.
Trains typically use diesel engines due to their high torque and fuel efficiency.
Electric engines are also used in some trains, especially in urban areas.
Steam engines were used in the past but are now rare.
Hybrid engines that combine diesel and electric power are becoming more common.
The type of engine used in a train depends on factors such as the distance it travels an...
Thermodynamics is the study of energy and its transformations in relation to heat and work.
It deals with the behavior of energy and its conversion from one form to another.
It involves the study of heat transfer, work, and the properties of substances.
Thermodynamics is essential in designing and analyzing various mechanical systems.
Examples include the study of engines, refrigeration systems, and power plants.
Enthalpy is the heat content of a system, while entropy is the measure of disorder or randomness in a system.
Enthalpy is the sum of internal energy and the product of pressure and volume.
Entropy is the measure of the number of ways energy can be distributed in a system.
Heat loss in entropy occurs due to the transfer of energy from a hot object to a cold object.
Entropy always increases in a closed system, leading t...
Adiabatic process is a thermodynamic process where no heat is exchanged with the surroundings. Hyperbolic process is a type of adiabatic process.
Adiabatic process occurs when there is no heat transfer between the system and its surroundings
Hyperbolic process is a type of adiabatic process where the pressure and volume of a gas are inversely proportional
Adiabatic compression of a gas can cause an increase in temper...
Blue Star Mechanical Engineer Interview Experiences
2 interviews found
Aniket Nikhade
Selected
I applied via Walk-in and was interviewed in Jul 2023. There were 3 interview rounds.
(1 Question)
- Q1. Mechanical engineering questions
(1 Question)
- Q1. English communication round
I applied via Campus Placement and was interviewed in Nov 2021. There were 6 interview rounds.
Interview Questionnaire
10 Questions
- Q1. 1. Introduction
- Ans. Hi Sir, I am xyz(name)from Xyz. As far as my qualification was done my basic schooling was done from xyz and I have completed B tech from Xyz. As I am a fresher I have theortical knowledge but not having practical knowledge so I want to learn practical knowledge to contribute for your organization. My project is xyz and my role is xyz. My internship has completed from Xyz and I was situated for one month. My hobbies ar...
- Q2. 2. Family Background
- Q3. 3. Hobbies in Deep
- Q4. 4. What is Thermodynamics
- Ans.
Thermodynamics is the study of energy and its transformations in relation to heat and work.
It deals with the behavior of energy and its conversion from one form to another.
It involves the study of heat transfer, work, and the properties of substances.
Thermodynamics is essential in designing and analyzing various mechanical systems.
Examples include the study of engines, refrigeration systems, and power plants.
- Q5. 5. Which type of engine we use in Train
- Ans.
Diesel engines are commonly used in trains.
Trains typically use diesel engines due to their high torque and fuel efficiency.
Electric engines are also used in some trains, especially in urban areas.
Steam engines were used in the past but are now rare.
Hybrid engines that combine diesel and electric power are becoming more common.
The type of engine used in a train depends on factors such as the distance it travels and the...
- Q6. 6. Draw the P,V and T,S diagram
- Ans.
P,V and T,S diagrams are graphical representations of thermodynamic processes.
P,V diagram shows the relationship between pressure and volume.
T,S diagram shows the relationship between temperature and entropy.
P,V and T,S diagrams are useful in analyzing thermodynamic cycles.
P,V and T,S diagrams can be used to determine the efficiency of a heat engine.
P,V and T,S diagrams are commonly used in the design of power plants a...
- Q7. 7. what is adiabatic process and Hyperbolic process
- Ans.
Adiabatic process is a thermodynamic process where no heat is exchanged with the surroundings. Hyperbolic process is a type of adiabatic process.
Adiabatic process occurs when there is no heat transfer between the system and its surroundings
Hyperbolic process is a type of adiabatic process where the pressure and volume of a gas are inversely proportional
Adiabatic compression of a gas can cause an increase in temperature
...
- Q8. 8. What is the difference between IDU and ODU
- Ans.
IDU and ODU are abbreviations used in air conditioning systems. IDU stands for Indoor Unit and ODU stands for Outdoor Unit.
IDU is the unit that is installed inside the room or building, while ODU is installed outside.
IDU is responsible for cooling or heating the air inside the room, while ODU is responsible for dissipating the heat outside.
IDU is connected to ODU through refrigerant pipes and electrical cables.
Examples...
- Q9. What is the Enthalpy and Entropy, In Entropy how heat loss happen
- Ans.
Enthalpy is the heat content of a system, while entropy is the measure of disorder or randomness in a system.
Enthalpy is the sum of internal energy and the product of pressure and volume.
Entropy is the measure of the number of ways energy can be distributed in a system.
Heat loss in entropy occurs due to the transfer of energy from a hot object to a cold object.
Entropy always increases in a closed system, leading to a d...
- Q10. What is the difference between AC and Cooler
- Ans.
AC is a device that cools and dehumidifies air while cooler is a device that cools water or other liquids.
AC is used to cool and dehumidify air in a room or building
Cooler is used to cool water or other liquids for drinking or industrial purposes
AC uses refrigerant to cool the air while cooler uses water or other liquids
AC is more expensive and complex than cooler
AC is more commonly used in residential and commercial b...
Interview Preparation Tips
Top trending discussions
Interview questions from similar companies
I applied via Walk-in and was interviewed before Aug 2020. There was 1 interview round.
Interview Questionnaire
1 Question
- Q1. About my last job description
Interview Preparation Tips
Abhishek Bandejia
Interview Questionnaire
2 Questions
- Q1. Coding questions on data structures and oops
- Q2. Various questions on cv, projects, por's, etc
Interview Preparation Tips
Experience: Questions were normal like any other aptitude or coding tests.
Tips: Time given was enough for other sections but you need to hurry a little in aptitude part.
Duration: 60 minutes
Total Questions: 60
Round: Technical Interview
Experience: The questions were basic, some where well known like reversing a link list using recursion, designing of car parking lot using concept of oops, find tree height/diameter, etc.
Tips: 1. They ask you to write complete code on paper. This sometimes turn out to be a challenging task when you don't have compiler to correct you on basic things. Practice writing codes on paper.
2. They surely ask questions on oops, like polymorphism, inheritance, etc. besides their definition, also practice writing sudo codes to explain them
Round: HR Interview
Experience: Mainly i was asked questions on my internship experience and POR's.
Tips: They will try to grill you on some questions like 'Why we should hire you?', have a clear reason in your mind. Your other answers should not contradict with your reasons
General Tips: I don't know about other colleges but HP recruits small number of students from my university. Coding questions were average level and can easily be tackled. Many students were rejected after HR interview so don't take it lightly. They do grill you in a very good style if they are in doubt about your selection
Skills: willingness, Enthusiasm, Coding skills, Aptitude skills
College Name: IIT Guwahati
Interview Questionnaire
1 Question
- Q1. All technical questions raised
Selected
I applied via Walk-in and was interviewed before Feb 2022. There were 3 interview rounds.
(1 Question)
- Q1. All questions are related to the fieldwork.
(1 Question)
- Q1. Discuss about the previous company and their working projects, CTC and working cultures etc.
Interview Preparation Tips
Senior Engineer Interview Questions & Answers
Haier Appliances India
Anonymous
posted on 29 Nov 2022
I applied via Naukri.com and was interviewed before Nov 2021. There were 2 interview rounds.
(2 Questions)
- Q1. About your current company & your role in there, major activity of your which helping your department.
- Q2. Draw some case study & explain improvements which you have done there
- Ans.
Improved efficiency of production line at XYZ manufacturing plant
Implemented lean manufacturing principles to reduce waste and increase productivity
Introduced automation in certain processes to reduce manual labor and increase accuracy
Optimized supply chain management to ensure timely delivery of raw materials
Trained and empowered employees to identify and solve problems on the production line
Implemented a continuous i...
Interview Preparation Tips
I applied via Company Website and was interviewed in Jan 2022. There were 2 interview rounds.
(2 Questions)
- Q1. How to protect electrical panel in one words
- Ans.
Insulation
Insulate the panel
Use protective covers
Ensure proper grounding
Regular maintenance
- Q2. What is the process of ug cable laying and its creteria
- Ans.
UG cable laying process involves trenching, cable pulling, jointing, and testing.
Trenching is done to create a path for the cable and ensure proper depth
Cable pulling involves laying the cable in the trench and securing it with clamps
Jointing is done to connect two cables together using connectors and insulators
Testing is done to ensure the cable is properly installed and functioning
Criteria for UG cable laying include...
Interview Preparation Tips
Selected
I appeared for an interview before Apr 2024, where I was asked the following questions.
- Q1. What are the basics of the refrigeration cycle?
- Ans.
The refrigeration cycle is a thermodynamic process that removes heat from a designated area to lower its temperature.
1. Evaporation: Refrigerant absorbs heat from the environment, turning from liquid to gas.
2. Compression: The gas is compressed, increasing its pressure and temperature.
3. Condensation: The hot gas releases heat to the surroundings, condensing back into a liquid.
4. Expansion: The liquid refrigerant expan...
- Q2. What is the difference between chillers and Variable Refrigerant Flow (VRF) systems? What are the different types of compressors?
- Ans.
Chillers and VRF systems differ in design, application, and efficiency, with various compressor types influencing performance.
Chillers are centralized cooling systems, while VRF systems are decentralized and allow for individual zone control.
Chillers typically use water or refrigerant to cool large buildings, e.g., centrifugal chillers for commercial use.
VRF systems use refrigerant as the cooling medium and can simulta...
- Q3. What is COP and heat load calculations. Types of PCBs in VRF. What is AHU and types
- Ans.
COP measures efficiency in heating/cooling systems; heat load calculations determine required capacity for HVAC systems.
COP (Coefficient of Performance) is the ratio of useful heating or cooling provided to the energy consumed.
Heat load calculations assess the thermal energy needed to maintain desired indoor temperatures.
Types of PCBs (Printed Circuit Boards) in VRF (Variable Refrigerant Flow) systems include control P...
I applied via Recruitment Consulltant and was interviewed in Dec 2021. There were 3 interview rounds.
Question was related to dynamic programming. There was only one question and I had solve it within 4 hours. There were 50 test cases. All test cases must pass.
(1 Question)
- Q1. Basic Java questions and some behavioural questions.
(1 Question)
- Q1. Behavioural questions.
Interview Preparation Tips
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|  ₹8.7 L/yr - ₹15 L/yr |
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338
salaries
| ₹4 L/yr - ₹10 L/yr |
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