OPPO Mobile Service Engineer Interview Questions and Answers for Experienced

They ask to many technical question and ask to code also

They ask for your background and thing you learnt in your past

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
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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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1 hour - Trees, Array, Hashmap, DP, CP etc

Q1. Project discussion
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Q1. Explain k means algorithm
Ans. 
K-means algorithm is a clustering algorithm that partitions data into k clusters based on similarity.
• Iteratively assigns data points to the nearest cluster centroid

• Calculates new centroids based on the mean of data points in each cluster

• Repeats until centroids no longer change significantly

• Used in data mining, image segmentation, and customer segmentation
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Q2. What process did you follow for data preprocessing
Ans. 
I followed a systematic approach for data preprocessing including data cleaning, normalization, encoding, and feature scaling.
• Performed data cleaning to handle missing values and outliers

• Normalized numerical features to bring them to a similar scale

• Encoded categorical variables using techniques like one-hot encoding

• Applied feature scaling to ensure all features contribute equally to the model
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