Amwaj Catering Services Electrical Engineer Interview Questions and Answers

A star delta starter is a type of reduced voltage starter used for starting high power motors.

• Consists of a star contactor and a delta contactor

• Reduces starting current and torque

• Commonly used for motors above 5 HP

• Helps in reducing mechanical stress on the motor

A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.

• Transformers are used to increase or decrease voltage levels in electrical circuits.

• They consist of two coils of wire, known as the primary and secondary coils.

• The primary coil is connected to a power source, while the secondary coil is connected to the load.

• The changing magnetic field i...read more

ACB stands for Air Circuit Breaker, which is a type of circuit breaker that operates in the air as an arc extinguishing medium.

• ACB is used to protect electrical circuits from overloads and short circuits by automatically disconnecting the power supply when a fault is detected.

• It consists of a set of contacts that open and close to interrupt the flow of current in the circuit.

• ACBs are commonly used in industrial and com...read more

DG Safety device is a safety device used to protect diesel generators from damage or malfunction.

• DG Safety device monitors parameters like temperature, oil pressure, and voltage to ensure safe operation.

• It can automatically shut down the generator in case of any abnormal readings to prevent damage.

• Examples of DG Safety devices include automatic voltage regulators, engine control modules, and temperature sensors.

Transformer safety refers to measures taken to prevent accidents and ensure the proper functioning of transformers.

• Regular maintenance checks to identify any potential issues

• Proper grounding to prevent electrical shocks

• Using protective equipment when working with transformers

• Following safety guidelines and protocols

• Installing safety devices such as pressure relief valves

• Training employees on safe handling and operation

The reading on the DG changeover panel indicates the status of the diesel generator system.

• The reading on the panel will show which power source (main or backup) is currently supplying electricity.

• It may also display information about the load on the generator and any alarms or warnings.

• Regularly monitoring the panel reading is important to ensure smooth operation of the generator system.

Star-delta power wiring is a method used to reduce starting current in motors, while control wiring is used to control the operation of electrical systems.

• Star-delta power wiring involves connecting a motor in a star configuration during starting to reduce current spikes, then switching to a delta configuration for normal operation.

• Control wiring includes components like switches, relays, and contactors to control the ...read more

An HVAC system is a system that provides heating, ventilation, and air conditioning to a building or space.

• HVAC stands for Heating, Ventilation, and Air Conditioning

• It helps regulate temperature, humidity, and air quality in a building

• Examples of HVAC systems include furnaces, air conditioners, and ventilation systems