WellDoc Interview Questions and Answers

Power factor is the ratio of real power to apparent power in an electrical system. It needs to be maintained for efficient power transfer and to avoid penalties from utility companies.

• Power factor impacts the efficiency of power transfer in electrical systems

• Low power factor can result in higher energy costs and penalties from utility companies

• It affects the quality of power supply and can lead to voltage drops and equipment overheating

• Power factor can be improved by using po...read more

To check a motor, perform visual inspection, check for unusual noises or vibrations, test electrical connections, measure voltage and current, and perform insulation resistance test.

• Perform visual inspection for any signs of damage or wear

• Check for unusual noises or vibrations during operation

• Test electrical connections for tightness and proper wiring

• Measure voltage and current to ensure they are within specifications

• Perform insulation resistance test to check for any insulat...read more

VFD stands for Variable Frequency Drive, it is used to control the speed of an electric motor.

• VFD is used to vary the speed of an electric motor by adjusting the frequency of the electrical supply to the motor.

• Basic control for operating a VFD includes setting the desired speed or frequency, start/stop commands, and monitoring parameters like current and voltage.

• Examples of basic controls for operating a VFD include keypad control, remote control via a PLC, and communication ...read more

The monthly electricity bill varies depending on usage and location.

• The monthly electricity bill can be influenced by factors such as the size of the property, number of occupants, energy efficiency of appliances, and local electricity rates.

• Usage of high-energy consuming appliances like air conditioners, heaters, and refrigerators can significantly impact the electricity bill.

• Location plays a role as electricity rates can vary by region or utility provider.

• Implementing energ...read more

Plant load refers to the amount of power being consumed by a plant or facility at a given time.

• Plant load is measured in kilowatts (kW) or megawatts (MW).

• It represents the total electrical demand of the plant's equipment and machinery.

• Plant load can fluctuate throughout the day based on production needs and equipment usage.

• Monitoring plant load is important for ensuring efficient operation and preventing overload.

• Examples: A manufacturing plant running multiple machines simul...read more

Proximity sensors detect the presence of an object without physical contact, while relays are used to control electrical circuits.

• Proximity sensors use electromagnetic fields, light, or sound to detect objects nearby.

• Relays are switches that open or close circuits based on an electrical signal.

• Proximity sensors can be used in automated doors, smartphones, and industrial machinery.

• Relays are used in control panels, HVAC systems, and automotive applications.