Core Technology Interview Questions and Answers

Over current protection, differential protection, and earth fault protection are methods used to safeguard electrical systems.

• Over current protection is used to detect and interrupt excessive current flow in a circuit.

• Differential protection compares the current entering and leaving a component to detect faults.

• Earth fault protection detects current leakage to the earth and isolates the faulty circuit.

• Over current protection devices include fuses, circuit breakers, and relays...read more

The induction motor starting principle is based on the creation of a rotating magnetic field.

• An induction motor starts by applying a voltage to the stator windings, creating a rotating magnetic field.

• The rotating magnetic field induces currents in the rotor windings, which in turn creates a magnetic field.

• The interaction between the stator and rotor magnetic fields causes the rotor to start rotating.

• Different methods like direct-on-line starting, star-delta starting, and auto...read more

Different types of sources of electricity include fossil fuels, nuclear power, renewable energy sources, and batteries.

• Fossil fuels (coal, oil, natural gas)

• Nuclear power

• Renewable energy sources (solar, wind, hydro, geothermal)

• Batteries (lithium-ion, lead-acid)

Cable construction involves multiple layers for insulation and protection.

• Cables are typically constructed with multiple layers for insulation and protection.

• The innermost layer is the conductor, usually made of copper or aluminum.

• The next layer is the insulation, which can be made of materials like PVC, polyethylene, or rubber.

• Additional layers may include shielding to protect against electromagnetic interference.

• The outermost layer is the jacket, which provides mechanical p...read more

Transformer parts include core, windings, insulation, and cooling system.

• The core is made of laminated iron or steel and provides a path for magnetic flux.

• Windings consist of primary and secondary coils, which are insulated copper wires.

• Insulation materials like paper, varnish, or oil are used to insulate the windings.

• Cooling systems such as fans, radiators, or oil pumps are used to dissipate heat.

• Other parts include bushings, tap changers, and protective devices.