USHA International Service Engineer Interview Questions and Answers

A circuit breaker is an electrical switch that automatically interrupts the flow of current in a circuit in case of an overload or short circuit.

• It is a safety device used to protect electrical circuits from damage caused by excess current flow.

• It works by detecting the excess current and interrupting the flow of electricity to prevent damage to the circuit.

• Circuit breakers are commonly used in homes, buildings, and in...read more

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

• Relays are commonly used in control circuits to switch high voltage or current using a low voltage signal.

• They can be used to control motors, lights, and other electrical devices.

• Relays can be classified based on their construction, contact configuration, and operating voltage.

• Examples of relays include electro...read more

Yes, I know how to operate air circuit breaker.

• I am familiar with the basic components of an air circuit breaker.

• I know how to turn on and off the breaker.

• I am aware of the safety precautions that need to be taken while operating the breaker.

• I have experience in troubleshooting and repairing air circuit breakers.

• I am knowledgeable about the different types of air circuit breakers and their applications.

Relay is an electrically operated switch that opens or closes circuits electronically.

• Relays are used to control high voltage circuits with low voltage signals.

• They are used in automation systems, power plants, and automobiles.

• Examples include electromagnetic relays, solid-state relays, and thermal relays.

A contactor is an electrical device used to control the flow of electricity in a circuit.

• Contactor is used to switch on and off electrical power to a load.

• It is commonly used in motor control circuits to control the operation of motors.

• Contactor helps in protecting electrical circuits from overload or short circuits.

• It provides a safe and reliable method of controlling high-power electrical loads.

• Contactor can be manua...read more