APOLLO POWER SYSTEMS Electrical Maintenance Engineer Interview Questions and Answers

Synchronisation of generator involves aligning the speed and phase of the generator with the grid before connecting them. Motor protection and maintenance are crucial for ensuring the longevity and efficiency of the motor.

• Synchronisation of generator involves matching the frequency, voltage, and phase angle of the generator with the grid before connecting them.

• Motor protection includes measures such as overload protect...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.

• There are two main types of transformers: step-up transformers and step-down transformers.

• Step-up transformers increase the voltage of the input power supply, while step-down transformers...read more

Current is the flow of electric charge in a circuit.

• Current is measured in Amperes (A)

• It is the rate of flow of electric charge through a conductor

• Current can be either direct current (DC) or alternating current (AC)

• In a series circuit, the current remains the same throughout

• Ohm's Law relates current, voltage, and resistance: I = V/R

Voltage is the difference in electric potential between two points in a circuit, measured in volts.

• Voltage is the force that pushes electric current through a circuit

• It is measured in volts (V)

• Voltage is the potential difference between two points in a circuit

• Higher voltage means more potential energy available to move electrons

• Voltage can be DC (direct current) or AC (alternating current)

VCB full form is Vacuum Circuit Breaker.

• VCB stands for Vacuum Circuit Breaker.

• It is a type of circuit breaker that uses a vacuum to extinguish the arc when the contacts open.

• VCBs are commonly used in medium voltage applications.

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

MCB full form is Miniature Circuit Breaker.

• MCB stands for Miniature Circuit Breaker.

• It is an electromechanical device that protects an electrical circuit from overcurrent.

• MCBs automatically switch off electrical circuits during abnormal conditions.

• They are commonly used in residential and commercial buildings for electrical safety.

• Examples of MCB brands include Schneider Electric, Siemens, and Legrand.

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

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

• The primary coil is connected to a power source, creating a magnetic field when current flows through it.

• This magnetic field induces a voltage in the secondary coil, allowing for the transfer of electrical energy.

• Tra...read more