JLL Project Engineer Interview Questions and Answers

The coefficient of cement is a measure of its ability to expand or contract due to changes in temperature or moisture.

• The coefficient of cement is also known as the coefficient of thermal expansion.

• It is an important factor to consider in construction projects to prevent cracking or damage to structures.

• The coefficient of cement varies depending on the type and composition of the cement.

• For example, Portland cement typ...read more

Escalation of materials refers to the process of increasing the priority or urgency of obtaining necessary materials for a project.

• Escalation may occur when there are delays in the delivery of materials or when the demand for materials exceeds the supply.

• Project managers may escalate materials by contacting suppliers to expedite delivery or by seeking alternative sources for the materials.

• Escalation can impact project ...read more

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

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

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

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

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

Mivan shuttering is a construction technique using aluminum formwork for casting concrete walls, slabs, columns, etc.

• Mivan shuttering involves setting up aluminum formwork panels on site

• The formwork is assembled and fixed using pins, wedges, and wallers

• Concrete is poured into the formwork and allowed to set

• Once the concrete has cured, the formwork is removed and reused for the next casting

• Mivan shuttering is known for