Hamilton Housewares Development Engineer Interview Questions and Answers

2 coding questions (1 DP + 1 Graph)

Q1. Leetcode easy, medium questions on tree, dp
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Q1. 1 coding question on string (hard).
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Q2. OS, DBMS, OOPs questions
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Q1. Usual HR questions + 2 puzzles question
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Q1. My job profile is refrigeration and air conditioning
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Q2. I'm work in fmi compeny in maintenance utility department
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Q3. Computer basik knowladge
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Q1. What are your basic R&R?
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Q1. What do you do when lot is NG & urgent for use?
Ans. 
I will immediately investigate the cause of the NG lot and work with the team to find a solution to make it usable.
• Investigate the cause of the NG lot

• Work with the team to find a solution

• Prioritize urgent use of the lot

• Ensure quality control measures are in place

• Communicate with stakeholders about the situation
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Q1. Why you wamt to leave current company & city?
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Q1. How to protect electrical panel in one words
Ans. 
Insulation
• Insulate the panel

• Use protective covers

• Ensure proper grounding

• Regular maintenance
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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...read more
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Q1. All questions are related to the fieldwork.
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Q1. Discuss about the previous company and their working projects, CTC and working cultures etc.
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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
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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
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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