Otis Elevator Lead Developer Interview Questions and Answers

About ai
today generation

They asked about corona

It was basically a aptitude round of 60 questions.

There were 3 coding questions.The question was based on Recursion and
Dynamic problem.

Q1. Self introduction What is polymorphism, oops concepts DBMS Indexes Normalisation Abstraction vs interface
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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. 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. 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?
Ans. 
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
Ans. 
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
Ans. 
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
Ans. 
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
Ans. 
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
Ans. 
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
Ans. 
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. Past experience and salary exp.
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Q1. Kpi and past exp disc.
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Q1. How to increase efficiency of product
Ans. 
Increasing product efficiency can be achieved through optimizing processes, improving technology, and enhancing employee skills.
• Optimize production processes to eliminate waste and improve workflow

• Upgrade technology to automate tasks and improve accuracy

• Provide training and development opportunities for employees to enhance their skills and knowledge
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Q2. What will you change in the product
Ans. 
I would improve the user interface to enhance user experience and streamline navigation.
• Enhance user interface design for better usability

• Streamline navigation to improve user experience

• Implement user feedback to make necessary changes

• Optimize performance for faster loading times
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