DMI DRAEXLMAIER MANUFACTURING Electrical Supervisor Interview Questions, Process, and Tips

HIRA stands for Hazard Identification and Risk Assessment.

• HIRA is a process used to identify potential hazards and assess the risks associated with them.

• It involves identifying hazards, evaluating the likelihood and severity of potential consequences, and determining appropriate control measures.

• HIRA is commonly used in industries such as construction, manufacturing, and oil and gas.

• Examples of hazards that may be iden...read more

EMS stands for Energy Management System.

• EMS is a computer-based system that helps manage energy consumption in buildings and facilities.

• It monitors and controls energy usage, identifies areas of inefficiency, and suggests ways to improve energy efficiency.

• EMS can be used in a variety of settings, including commercial buildings, hospitals, and industrial facilities.

• Examples of EMS include building automation systems, li...read more

A transformer is an electrical device that transfers electrical energy from one circuit to another through electromagnetic induction.

• Transformers are used to increase or decrease the voltage of an alternating current (AC) power supply.

• They consist of two coils of wire, called the primary and secondary coils, wrapped around a magnetic core.

• When an AC voltage is applied to the primary coil, it creates a magnetic field th...read more

APFC panel is used to improve power factor and reduce energy consumption.

• APFC panel helps in maintaining a high power factor which reduces energy consumption and saves money.

• It also helps in reducing voltage drops and improves the efficiency of electrical equipment.

• APFC panel is especially useful in industries where there are a lot of inductive loads such as motors and transformers.

• It monitors the power factor and auto...read more

Megger is used to measure insulation resistance in electrical systems.

• To ensure the safety of electrical systems and prevent electrical hazards.

• To detect any insulation breakdown or leakage in the system.

• To identify any potential faults or defects in the system.

• To comply with industry standards and regulations.

• Examples: testing cables, transformers, motors, generators, etc.

A permit system is a set of procedures and documents required to ensure safety and compliance with regulations before starting a job.

• Permit systems are used to control hazardous work activities.

• They involve obtaining permits and following specific procedures before starting work.

• Examples include hot work permits, confined space permits, and excavation permits.

• Permit systems help prevent accidents and ensure compliance ...read more

A compressor is a mechanical device that increases the pressure of a gas by reducing its volume.

• Compressors are used in various industries such as refrigeration, air conditioning, and gas processing.

• They come in different types such as reciprocating, rotary, and centrifugal compressors.

• Reciprocating compressors use pistons to compress gas, while rotary compressors use rotating impellers.

• Centrifugal compressors use a ro...read more

Relays are used to control high voltage or current circuits using low voltage signals.

• Relays provide electrical isolation between the control circuit and the load circuit.

• They can switch high voltage or current circuits using low voltage signals.

• Relays are used in applications such as motor control, lighting control, and power distribution.

• They can also be used for safety functions such as emergency shutdowns.

• Relays ar...read more

PM stands for Preventive Maintenance and RM stands for Reactive Maintenance.

• PM is a scheduled maintenance activity that aims to prevent equipment failure.

• RM is a maintenance activity that is performed after equipment failure.

• PM is proactive while RM is reactive.

• PM involves regular inspections, cleaning, and replacement of parts.

• RM involves troubleshooting, repairing, and replacing faulty parts.

• Examples of PM include ch...read more

A circuit breaker is an electrical switch that automatically interrupts the flow of current when it exceeds a certain limit.

• It is used to protect electrical circuits from damage caused by overloading or short circuits.

• It works by detecting the excess current and tripping the switch to break the circuit.

• It can be reset manually or automatically depending on the type of circuit breaker.

• Examples include thermal circuit br...read more

A contactor is an electrical switch used for switching an electrical circuit on or off.

• It is used to control electric motors, lighting, heating, and other electrical loads.

• It consists of a coil, contacts, and an enclosure.

• The coil generates a magnetic field that pulls the contacts together to close the circuit.

• Examples include HVAC systems, elevators, and industrial machinery.

• Contactor ratings are based on the amount o...read more

MCB stands for Miniature Circuit Breaker. It is an electrical switch that automatically shuts off the electrical circuit during an overload or short circuit.

• MCB is a type of circuit breaker that is commonly used in residential and commercial buildings.

• It is designed to protect electrical circuits from damage caused by overloading or short circuits.

• MCBs are available in different current ratings and can be easily replac...read more

A motor is a device that converts electrical energy into mechanical energy to produce motion.

• Motors are used in various applications such as electric vehicles, industrial machinery, and household appliances.

• There are different types of motors such as DC motors, AC motors, stepper motors, and servo motors.

• The basic principle of a motor is the interaction between a magnetic field and an electric current.

• Examples of motor...read more

A current transformer is a device that measures the current flowing in a circuit by producing a proportional current in its secondary winding.

• Consists of a primary winding and a secondary winding

• Primary winding is connected in series with the circuit carrying the current to be measured

• Secondary winding is connected to a measuring instrument or protective relay

• Produces a current in the secondary winding that is proporti...read more