AECOM Electrical Engineer 2 Interview Questions, Process, and Tips for Experienced

Transformers are sized based on load requirements and voltage levels.

• Determine the load requirements of the system

• Calculate the required kVA rating based on the load requirements

• Determine the voltage levels of the system

• Select a transformer with a kVA rating and voltage levels that meet the requirements

• Consider factors such as efficiency, temperature rise, and impedance when selecting a transformer

DG sizing depends on load demand, backup requirements, fuel availability, and budget.

• Calculate the total load demand of the system

• Determine the backup requirements and duration

• Consider the availability of fuel and its cost

• Evaluate the budget for the project

• Select a DG with appropriate capacity and efficiency

• Perform a feasibility study and cost-benefit analysis

• Consider environmental regulations and noise restrictions

• Ens

IEC codes and standards are international standards for electrical engineering.

• IEC stands for International Electrotechnical Commission

• IEC codes and standards ensure safety, reliability, and compatibility of electrical systems and equipment

• Examples of IEC standards include IEC 60601 for medical electrical equipment and IEC 61850 for communication networks and systems in substations

Voltage drop is the reduction in voltage that occurs as electricity flows through a circuit due to resistance.

• Calculate the total resistance of the circuit

• Determine the current flowing through the circuit

• Multiply the current by the total resistance to get the voltage drop

• Use Ohm's Law (V=IR) to calculate voltage drop across individual components

• Consider using voltage drop calculators or tables for more complex circuits

Choose cable based on voltage, current, temperature, environment and application.

• Determine voltage and current requirements

• Consider temperature range and environmental conditions

• Choose cable type based on application (e.g. power, data, signal)

• Select appropriate conductor material (e.g. copper, aluminum)

• Check for any regulatory requirements or standards (e.g. NEC, UL)

• Examples: THHN for indoor power, Cat6 for data transm

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Starters are used to control the starting current of motors.

• Starters are used to limit the inrush current during motor starting.

• They protect the motor from damage due to high starting current.

• Types of starters include direct-on-line, star-delta, and soft starters.

• Starters are commonly used in industrial and commercial applications.

• Examples of applications include pumps, fans, and conveyor belts.

Breakers are electrical switches that protect circuits from overloading and short circuits.

• Circuit Breaker - protects circuits from overloading and short circuits

• Ground Fault Circuit Interrupter (GFCI) - protects against electrical shock in wet areas

• Arc Fault Circuit Interrupter (AFCI) - protects against electrical fires caused by arcing

• Main Breaker - controls power to the entire electrical panel

• Miniature Circuit Break...read more