Updater Services Electrical Technician Interview Questions and Answers

UPS stands for Uninterruptible Power Supply. It is an electrical device that provides emergency power to a load when the input power source fails.

• UPS works by converting DC power from a battery to AC power that can be used by the load.

• It provides immediate power backup during power outages, preventing data loss and equipment damage.

• UPS can also regulate voltage and frequency, protecting the load from power surges and s...read more

AHU stands for Air Handling Unit. It is a device used to regulate and circulate air as part of a heating, ventilating, and air-conditioning (HVAC) system.

• AHU is responsible for filtering, heating, cooling, humidifying, and dehumidifying the air.

• It consists of a blower, heating and cooling elements, filters, and dampers.

• The blower pulls in air from the outside and passes it through the filters to remove impurities.

• The a...read more

AC stands for Alternating Current. There are two types of AC - Single Phase and Three Phase.

• AC is a type of electrical current that periodically reverses direction.

• Single Phase AC is commonly used in households and small businesses.

• Three Phase AC is used in industrial and commercial settings.

• AC power is generated by power plants and transmitted through power lines.

• AC voltage and frequency vary depending on the country ...read more

BMS Work CCTV operation involves monitoring and controlling CCTV systems through a Building Management System.

• BMS Work CCTV operation is a part of building automation systems that allows for remote monitoring and control of CCTV systems.

• It involves integrating CCTV systems with the BMS to enable real-time monitoring and control of cameras, recording devices, and other related equipment.

• BMS Work CCTV operation can be us...read more

AHU stands for Air Handling Unit.

• AHU is a device used to regulate and circulate air as part of a heating, ventilation, and air conditioning (HVAC) system.

• It typically consists of a blower, heating or cooling elements, filters, dampers, and sound attenuators.

• AHUs are commonly found in commercial and industrial buildings to maintain indoor air quality and comfort.

• Examples of AHU manufacturers include Trane, Carrier, and

Air Handling Unit

• AHU stands for Air Handling Unit

• AHUs are used to regulate and circulate air as part of HVAC systems

• They typically consist of a blower, heating or cooling elements, filters, and dampers

• AHUs are commonly found in commercial and industrial buildings

Transformer vector group is a method used to represent the phase shift between the primary and secondary windings of a transformer.

• Transformer vector group indicates the relationship between the primary and secondary winding phases.

• It helps in determining the connection and phase shift of the transformer windings.

• Common vector groups include Yy0, Yd1, Dyn11, etc.

• Vector group is important for parallel operation of trans

VBD test is conducted in transformers to ensure insulation integrity and detect any potential faults.

• VBD test helps in identifying any weak spots in the insulation of the transformer

• It helps in preventing breakdowns and ensuring the safety and reliability of the transformer

• By conducting VBD test, any potential faults can be detected early and necessary maintenance can be carried out

• It is a standard procedure in transfo

ACB stands for Air Circuit Breaker, which is a type of circuit breaker used to protect electrical circuits from overloads and short circuits.

• ACB is commonly used in low voltage power distribution systems

• It operates by automatically cutting off the power supply when a fault is detected

• ACBs are more reliable and require less maintenance compared to other types of circuit breakers

• Examples of ACB manufacturers include Schn

Contractors are individuals or companies hired to perform specific tasks or projects for a client or organization.

• Contractors are not employees of the client or organization, but rather work independently or as part of their own company.

• They are typically hired for a specific period of time or project, and are paid based on the terms of their contract.

• Examples of contractors include construction workers, freelance writ...read more

A relay is an electrically operated switch that opens or closes circuits electromechanically.

• Relays are used to control high voltage circuits with low voltage signals.

• They consist of a coil, an armature, and a set of contacts.

• When the coil is energized, the armature moves and the contacts either open or close.

• Relays are commonly used in industrial control systems, automotive applications, and household appliances.

• Examp...read more

Circuit breakers are essential safety devices that protect electrical circuits from overloads and short circuits.

• Circuit breakers automatically cut off power when there is an overload or short circuit to prevent damage to the electrical system.

• They are more convenient and safer than fuses, as they can be easily reset after tripping.

• There are different types of circuit breakers, such as thermal, magnetic, and combinatio...read more