Otis Elevator Network Engineer Interview Questions and Answers

Q1. Introduction, jobs & responsibility
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Q1. As per CV all question
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Q1. Once again introduction, pervious company details information & salary discussion
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Q1. Tell me about your work experience
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Q2. What's the new VRF tech in Daikin
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Q3. Ikwtr comparison for chiller and vrf
Ans. 
Chiller and VRF systems differ in their cooling capacity, efficiency, and cost.
• Chillers are better suited for large commercial buildings with high cooling loads.

• VRF systems are more efficient and cost-effective for smaller buildings or individual rooms.

• Chillers use water as a cooling medium, while VRF systems use refrigerant.

• Chillers require more maintenance and have a longer lifespan than VRF systems.

• VRF systems offer...read more
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Q1. How would you handle different meetings at a time.
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Q1. What are your salary expectations?
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Q2. What is your family background?
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Q3. Why are you looking for a change?
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Q1. How are you going to do this job efficiently
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I will prioritize tasks, communicate effectively, utilize resources efficiently, and continuously improve my skills.
• Prioritize tasks based on importance and deadlines

• Communicate effectively with team members and stakeholders

• Utilize resources such as tools and technologies to streamline processes

• Continuously improve skills through training and learning opportunities
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Q1. Questiones based on past experience and projects
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Q2. Reason for switching the job
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Q3. Knowledge of CAD softwares
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Q1. What is sub cooling in air conditioning?
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Sub cooling in air conditioning is the process of cooling the refrigerant below its saturation temperature to improve system efficiency.
• Sub cooling increases the efficiency of the air conditioning system by ensuring the refrigerant is in a liquid state before entering the expansion valve.

• It helps in preventing flash evaporation of the refrigerant, which can lead to inefficiencies in the system.

• Sub cooling is typically ...read more
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Q2. How is ISEER rating calculated
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ISEER rating is calculated based on the weighted average of the cooling performance of an air conditioner under different conditions.
• ISEER = (Weighted Cooling Capacity at 100% load x 0.4) + (Weighted Cooling Capacity at 75% load x 0.2) + (Weighted Cooling Capacity at 50% load x 0.4)

• The higher the ISEER rating, the more energy efficient the air conditioner is.

• ISEER rating helps consumers compare the energy efficiency of...read more
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Q3. Draw the Refrigeration cycle
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The refrigeration cycle is a thermodynamic cycle used in refrigerators and air conditioning systems to transfer heat from a low temperature to a high temperature environment.
• The cycle consists of four main components: compressor, condenser, expansion valve, and evaporator.

• The refrigerant enters the compressor as a low-pressure gas and leaves as a high-pressure, high-temperature gas.

• The high-pressure gas then flows into...read more
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Q4. Mainstream refrigerants used in household air conditioning
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Mainstream refrigerants used in household air conditioning include R-410A, R-22, and R-134a.
• R-410A is a popular refrigerant known for its high efficiency and environmental friendliness.

• R-22, although being phased out due to its ozone-depleting properties, is still commonly found in older air conditioning systems.

• R-134a is commonly used in automotive air conditioning systems but can also be found in some household units
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Q5. Explain 1 ton cooling concept
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1 ton cooling concept refers to the amount of heat required to melt one ton of ice in a 24-hour period.
• 1 ton of cooling is equal to 12,000 BTUs per hour

• It is commonly used in the HVAC industry to measure the cooling capacity of air conditioning systems

• For example, a 2-ton air conditioner can remove 24,000 BTUs of heat per hour
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Q6. Relation between current, voltage and power
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The relationship between current, voltage, and power is described by Ohm's Law, which states that current is directly proportional to voltage and inversely proportional to resistance.
• Ohm's Law states that V = I * R, where V is voltage, I is current, and R is resistance.

• Power (P) is calculated using the formula P = V * I, where P is power, V is voltage, and I is current.

• In a circuit with a constant resistance, an increa...read more
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Q7. Conversion from BTU to watts and vice versa
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1 BTU is approximately equal to 0.29307107 watts. To convert BTU to watts, multiply by 0.29307107. To convert watts to BTU, divide by 0.29307107.
• 1 BTU = 0.29307107 watts

• To convert BTU to watts, multiply by 0.29307107

• To convert watts to BTU, divide by 0.29307107
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Q1. No questions just test
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Q1. Would you be comfortable to regularly work extra hours?
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Q2. Introduction about yourself?
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Q3. Why do you want to join LG/ consumer durable industry?
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Q4. If your manager and colleagues are busy with work , how will you manage to learn the things from them?
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Q5. Present Salary and expected salary
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Q1. Background History
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Q2. Talk about your side projects and github repo
Ans. 
I have worked on various side projects including a personal website and a mobile app for tracking fitness goals.
• Developed a personal website using HTML, CSS, and JavaScript to showcase my projects and skills.

• Created a mobile app using React Native to track fitness goals and provide workout routines.

• Contributed to open-source projects on GitHub to improve my coding skills and collaborate with other developers.
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Basic QR Questions that includes logics, and puzzles

Hackerrank questions, 2 easy , 2 medium

Generic leetcode easy medium

Q1. Basics of os, networking
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Q1. Generic hr round
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Q1. About improvement project
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Q1. About the technical skills like FMEA, Risk analysis
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