Burohappold Engineering Interview Questions, Process, and Tips

Starters are devices used to start and control the speed of induction motors.

• Direct On-Line (DOL) starter: provides full voltage to the motor at start

• Star-Delta starter: reduces the starting current by initially connecting the motor in star configuration

• Auto-transformer starter: uses an auto-transformer to reduce the voltage during starting

• Soft starter: gradually increases the voltage to the motor to reduce starting cu...read more

Earthing is the process of connecting electrical systems to the ground to prevent electric shock and protect equipment.

• Types of earthing include plate earthing, pipe earthing, rod earthing, and strip earthing.

• Methods of earthing include neutral earthing, equipment earthing, and system earthing.

• Earthing is essential for safety in electrical systems to prevent electric shock and damage to equipment.

• Proper earthing ensure...read more

TF stands for Transformer. It is a static device used to transfer electrical energy between two or more circuits through electromagnetic induction.

• Principle of TF involves Faraday's law of electromagnetic induction.

• Types of TF include step-up, step-down, isolation, auto-transformer, etc.

• TFs are used in power distribution, voltage regulation, impedance matching, etc.

The starting current of a DOL starter is typically 6-8 times the rated current of the motor.

• The Direct-On-Line (DOL) starter is used to start induction motors.

• The starting current of a DOL starter is usually 6-8 times the rated current of the motor.

• This high starting current can cause voltage drops and stress on the electrical system.

Choose AC cables based on current rating, insulation material, and environmental conditions.

• Consider the current rating of the cable to ensure it can handle the load

• Choose the appropriate insulation material based on the application and environment

• Take into account environmental conditions such as temperature, moisture, and exposure to chemicals

• Select the right cable size to minimize voltage drop and power loss

• Ensure c...read more

Primary Variable pumping system uses a variable speed pump to control flow rate based on the demand of the system.

• Variable speed pump adjusts flow rate based on system demand

• Flow rate is controlled by changing pump speed

• Pressure sensors or flow meters provide feedback to the pump controller

• Efficient and energy-saving system compared to constant speed pumps

Space planning involves organizing and arranging interior spaces to optimize functionality and efficiency.

• Start by analyzing the space requirements and constraints

• Consider the purpose of the space and the activities that will take place

• Create a layout that maximizes flow and usability

• Take into account factors such as furniture placement, lighting, and circulation

• Use tools like floor plans, sketches, and 3D models to vi...read more

I use software like Carrier HAP, EnergyPlus, or Trace for heat load calculations.

• Carrier HAP is commonly used for commercial HVAC systems

• EnergyPlus is a powerful simulation tool for energy modeling

• Trace is known for its user-friendly interface and accurate results

DOAS system stands for Differential Optical Absorption Spectroscopy system used for monitoring air quality.

• DOAS system is a remote sensing technique used to measure concentrations of trace gases in the atmosphere.

• It works by analyzing the absorption of sunlight by gases in the atmosphere.

• DOAS systems are commonly used for monitoring air quality, studying pollution sources, and measuring greenhouse gas concentrations.

• Ex...read more

Uniformity factor is the ratio of the minimum illuminance to the average illuminance on a surface. Maintenance factor is the ratio of the illuminance after a period of time to the initial illuminance.

• Uniformity factor is important in lighting design to ensure consistent lighting levels across a space.

• A higher uniformity factor indicates more even lighting distribution.

• Maintenance factor accounts for factors like dirt a...read more

Electrical lightning protection design codes and standards are guidelines that ensure the safety and effectiveness of lightning protection systems.

• National Fire Protection Association (NFPA) 780 is a widely recognized standard for lightning protection design.

• International Electrotechnical Commission (IEC) 62305 is another commonly used standard for lightning protection.

• These codes and standards provide guidelines for t...read more

Electrical earthing design is a crucial aspect of electrical engineering that ensures safety and proper functioning of electrical systems.

• Electrical earthing design involves creating a low-resistance path for electrical current to flow into the ground.

• It helps prevent electric shock, protects equipment from damage, and ensures proper functioning of protective devices like circuit breakers.

• Different types of earthing sy...read more