LTIMindtree Interview Questions and Answers

Answers to common questions related to electric bus maintenance and operation.

• The lifespan of a typical electric bus battery is around 5-10 years, depending on factors like usage patterns, charging practices, and temperature conditions.

• Total cost of ownership (TCO) for an electric bus includes initial purchase cost, maintenance expenses, fuel/electricity costs, and potential incentives. TCO for electric buses is usually lower than diesel buses over the long term.

• Safety precau...read more

The components used in EV powertrain department include battery, motor, inverter, gearbox, and charging system.

• Battery provides power to the motor

• Motor converts electrical energy into mechanical energy

• Inverter converts DC power from battery to AC power for the motor

• Gearbox controls the speed and torque of the motor

• Charging system charges the battery

IPM synchronous motor uses permanent magnets to create a rotating magnetic field that interacts with the stator windings.

• IPM synchronous motor has a rotor with permanent magnets that create a magnetic field

• The stator windings are energized with AC current to create a rotating magnetic field

• The interaction between the rotor and stator magnetic fields causes the motor to rotate

• IPM synchronous motor is more efficient and has better performance than traditional induction motors

Different types of relays are used depending on the application and requirements.

• Electromechanical relays

• Solid-state relays

• Thermal relays

• Reed relays

• Polarized relays

• Time-delay relays

• Overload protection relays

• Mercury-wetted relays

• Hybrid relays

A relay is an electrically operated switch that uses an electromagnet to mechanically open or close a circuit.

• Relays are used to control high voltage or high current circuits with a low voltage signal.

• They are commonly used in industrial control systems, automotive applications, and home automation.

• When a current flows through the coil of the relay, it creates a magnetic field that pulls the contacts together, completing the circuit.

• Relays can be normally open (NO) or normall...read more