OCS Group Mst Electrician Interview Questions and Answers

DG stands for Diesel Generator, used as a backup power source. A transformer is an electrical device that transfers electrical energy between two or more circuits.

• DG (Diesel Generator) is a standalone power source that uses diesel fuel to generate electricity during power outages.

• Transformers are used to increase or decrease voltage levels in electrical circuits for transmission and distribution.

• Transformers can be ste...read more

The role of APFC (Automatic Power Factor Controller) is to maintain the power factor of electrical systems by automatically switching capacitors in and out of the circuit.

• APFC monitors the power factor of the system and activates or deactivates capacitors accordingly.

• It helps in reducing electricity bills by improving power factor and reducing reactive power consumption.

• APFC ensures efficient utilization of electrical ...read more

Transformation ratio is the ratio of the number of turns in the primary winding to the number of turns in the secondary winding of a transformer.

• Transformation ratio determines the voltage transformation between the primary and secondary windings of a transformer.

• It is calculated as the ratio of the number of turns in the primary winding to the number of turns in the secondary winding.

• For example, if a transformer has ...read more

Chillers operate by removing heat from a liquid through a refrigeration cycle.

• Chillers use a compressor to compress refrigerant gas, which then condenses into a liquid.

• The liquid refrigerant is then pumped through an evaporator, where it absorbs heat from the chilled water.

• The refrigerant then returns to the compressor to repeat the cycle.

• Chillers can be air-cooled or water-cooled, depending on the application.

• Chillers...read more

Actuator is a device that converts electrical energy into mechanical motion.

• Actuators are used in HVAC systems to control the flow of air, water, or steam.

• They can be electric, pneumatic, or hydraulic.

• Examples of actuators include valves, dampers, and motors.

• Actuators are essential for maintaining temperature, humidity, and air quality in HVAC systems.