Tenneco Utility & Maintenance Engineer Interview Questions and Answers

Star delta connection is a method of connecting three-phase electrical motors.

• It is used to reduce the starting current of the motor.

• In star connection, the motor windings are connected in a triangle and in delta connection, they are connected in a star.

• The switch from star to delta is done using a contactor.

• The motor runs at a lower voltage in star connection and at full voltage in delta connection.

DG stands for Diesel Generator. It is a backup power source that works by converting diesel fuel into electricity.

• DG is commonly used in areas with frequent power outages or in remote locations where there is no access to the power grid.

• It consists of a diesel engine and an alternator that work together to generate electricity.

• Maintenance of DG includes regular oil and filter changes, checking the battery and coolant l...read more

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 the voltage of an alternating current (AC) power supply.

• They work on the principle of electromagnetic induction, where a changing magnetic field induces a voltage in a coil of wire.

• The ratings of a transformer include its voltage rating, curr...read more

The voltage between neutral to ground or earth is ideally zero, but can vary depending on the electrical system and grounding practices.

• In a properly grounded electrical system, the voltage between neutral and ground should be zero.

• However, in some cases, such as when there is a fault in the system or improper grounding practices, the voltage can be higher.

• The voltage between neutral and ground can also vary depending ...read more