Electrical Maintenance Technician Interview Questions and Answers for Freshers

Generators convert mechanical energy into electrical energy. Transformers change voltage levels. Converters and inverters change DC to AC and vice versa.

• Generators use a rotating shaft to turn a magnetic field, creating electrical energy

• Transformers use electromagnetic induction to change voltage levels

• Converters change DC to AC or AC to DC, commonly used in power electronics

• Inverters change DC to AC, commonly used in solar power systems

The unit of resistance is Ohm (Ω).

• The unit of resistance is denoted by the symbol Ω (Ohm)

• Resistance is measured in Ohms

• Named after German physicist Georg Simon Ohm

• Commonly used in electrical circuits

Bussbars are used to distribute electrical power while fuses and MCBs are protective devices used to prevent overloading and short circuits.

• Bussbars are made of copper or aluminum and are used to distribute electrical power to various components in a system.

• Fuses are protective devices that are designed to break the circuit when there is an overload or short circuit. They contain a metal wire or filament that melts when the current exceeds a certain level.

• MCBs (Miniature Circ...read more

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 energy available to move electrons

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

Reading a drawing involves understanding symbols, dimensions, and annotations to interpret the design and construction details.

• Start by familiarizing yourself with the drawing's title block, which contains important information like the scale, revision history, and project details.

• Identify the different types of lines used in the drawing, such as solid lines for visible edges, dashed lines for hidden features, and dotted lines for centerlines.

• Pay attention to symbols and thei...read more

The name of transformer used oil is transformer oil or insulating oil.

• Transformer oil is a highly refined mineral oil that is stable at high temperatures and has excellent electrical insulating properties.

• It is used to cool and insulate transformers, circuit breakers, and other electrical equipment.

• Transformer oil is also known as insulating oil or dielectric oil.

• It is important to regularly test and maintain transformer oil to ensure it is functioning properly and not contam...read more

Transformer work involves installation, maintenance, and repair of transformers used in electrical systems.

• Installation of transformers in electrical systems

• Maintenance of transformers to ensure proper functioning

• Repair of transformers in case of faults or damage

• Testing of transformers to ensure they meet safety standards

• Knowledge of transformer types and their applications

• Ability to read and interpret technical drawings and schematics

• Familiarity with electrical codes and reg...read more