JLL Technical Engineer Interview Questions, Process, and Tips

Q1. Use of shunt relay in acb.
Ans. 
A shunt relay in an ACB is used to provide protection against overcurrents by diverting excess current away from the main circuit.
• Shunt relay is connected in parallel with the main circuit of the ACB.

• It detects overcurrents and activates to divert the excess current through a shunt path.

• This helps in protecting the main circuit from damage due to overcurrents.

• Shunt relays are commonly used in Air Circuit Breakers (ACBs...read more
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Q2. What is coc in hvac.
Ans. 
CoC in HVAC stands for Certificate of Conformance, which is a document certifying that a product meets specified requirements.
• CoC in HVAC is a Certificate of Conformance that ensures a product meets specific requirements.

• It is often required in HVAC projects to ensure quality and compliance.

• CoC may include details such as product specifications, testing results, and manufacturer information.
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Q3. What is Biological oxygen demand and Carbonic oxygen demand in STP Plant.
Ans. 
Biological oxygen demand (BOD) and Chemical oxygen demand (COD) are important parameters in wastewater treatment plants.
• Biological oxygen demand (BOD) is a measure of the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material in water.

• Carbonaceous oxygen demand (COD) is a measure of the amount of oxygen required to oxidize all the organic and inorganic matter in water.

• BOD is a ...read more
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Q4. What is voltage monitoring relay.
Ans. 
A voltage monitoring relay is a device that monitors voltage levels and triggers an alarm or protective action if the voltage exceeds or falls below a set threshold.
• Monitors voltage levels in electrical systems

• Triggers alarm or protective action if voltage exceeds or falls below set threshold

• Used to protect equipment from damage due to voltage fluctuations
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Q5. Working principle of wtp plant.
Ans. 
WTP plant works on the principle of physical and chemical processes to remove impurities from water.
• Water enters the plant and goes through processes like coagulation, flocculation, sedimentation, filtration, and disinfection.

• Coagulation involves adding chemicals to water to make impurities clump together.

• Flocculation helps in forming larger particles called floc for easier removal.

• Sedimentation allows the floc to sett...read more
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Q6. What is your daily and monthly Reports.
Ans. 
I provide daily and monthly reports on project progress, issues, and key metrics to track performance.
• Daily reports include updates on tasks completed, challenges faced, and plans for the next day.

• Monthly reports summarize overall progress, budget status, and any potential risks or delays.

• Reports may also include key performance indicators (KPIs) such as project milestones achieved, budget variance, and resource utiliz...read more
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Q1. LT Side Equipments
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Q1. Introduction & Salary
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Q1. About Binary search
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Q1. About project and ER diagram
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Q1. JavaScript question
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Q1. Coding questions
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Easy Lettcode questions multiple

Q1. Lld round with java
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Q1. Chiller efficiency
Ans. 
Chiller efficiency is a measure of how well a chiller unit is able to cool a space while using the least amount of energy.
• Chiller efficiency is typically measured by the Coefficient of Performance (COP), which is the ratio of cooling output to energy input.

• Regular maintenance and cleaning of chiller components can improve efficiency.

• Upgrading to a more energy-efficient chiller model can also increase efficiency.

• Proper ...read more
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Q2. Which one more efficiently? Air cooled,or water cooled???
Ans. 
Water cooled systems are generally more efficient than air cooled systems due to higher heat transfer capabilities.
• Water has higher heat transfer capabilities compared to air

• Water cooled systems can maintain more consistent temperatures

• Water cooled systems are typically used in high performance applications such as data centers and industrial machinery
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Q3. How we improved duct velocity?
Ans. 
Duct velocity can be improved by increasing the fan speed or reducing the duct size.
• Increase the fan speed to increase the air velocity in the duct.

• Reduce the duct size to increase the air velocity.

• Use dampers or adjustable louvers to control and optimize the airflow.

• Ensure proper sealing of duct joints to minimize air leakage.

• Consider using smooth and straight ducts to reduce friction and improve airflow.

• Regularly cle...read more
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Q4. What types of gas use chiller system?
Ans. 
The chiller system uses various types of gases for cooling purposes.
• Common types of gases used in chiller systems include R-134a, R-410A, and ammonia.

• R-134a is a hydrofluorocarbon (HFC) refrigerant commonly used in air conditioning systems.

• R-410A is a blend of hydrofluorocarbons used as a replacement for older refrigerants.

• Ammonia (NH3) is often used in industrial chiller systems due to its high cooling capacity.

• Other ...read more
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Q5. How we decided the vrf system capacity as per area??
Ans. 
The VRF system capacity is determined based on the area's cooling and heating load requirements.
• Calculate the total cooling load and heating load for the area

• Consider factors such as insulation, windows, occupancy, and equipment

• Select VRF system capacity based on the calculated load requirements

• Consult with HVAC professionals for accurate sizing
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Q1. How connect internet to computer Answer: connect R j 45 divice
Ans. 
To connect the internet to a computer, use an Ethernet cable (RJ-45) to connect the computer's Ethernet port to a modem or router.
• Obtain an Ethernet cable (RJ-45)

• Locate the Ethernet port on the computer

• Connect one end of the Ethernet cable to the computer's Ethernet port

• Connect the other end of the Ethernet cable to a modem or router

• Ensure the modem or router is connected to the internet

• Configure network settings on th
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Q2. What is duplex.
Ans. 
Duplex is a communication mode that allows data to be transmitted in both directions simultaneously.
• Duplex refers to the ability of a communication system to transmit and receive data at the same time.

• It is commonly used in networking and telecommunications to describe the type of communication between devices.

• There are two types of duplex: half-duplex and full-duplex.

• In half-duplex, data can be transmitted in both dir...read more
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