BHEL Site Supervisor and Engineer Interview Questions and Answers

A relay is an electrically operated switch that uses an electromagnet to mechanically operate a switch.

• Relays are used to control high power circuits with low power signals

• They can be used for various applications such as controlling motors, lights, and heating elements

• Types of relays include electromagnetic relays, solid-state relays, thermal relays, and reed relays

A circuit breaker is an electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit.

• Circuit breakers automatically detect faults in the electrical system and interrupt the flow of electricity to prevent damage.

• They come in different types such as thermal-magnetic, magnetic, and hydraulic-magnetic circuit breakers.

• Common examples include miniature circuit breakers (MCB), m...read more

A resistor is an electrical component that resists the flow of electric current. There are various types of resistors based on their construction and materials used.

• Resistors are used to limit the flow of current in a circuit.

• Types of resistors include carbon film, metal film, wirewound, and variable resistors.

• Resistors are measured in ohms (Ω) and have color-coded bands to indicate their resistance value.

A resistor is an electrical component that resists the flow of electrical current, causing a drop in voltage.

• Resistors are used to control the amount of current flowing in a circuit.

• They are measured in ohms (Ω) and have color-coded bands to indicate their resistance value.

• Resistors can be fixed or variable, with variable resistors allowing for adjustable resistance.

• Examples of resistors include carbon film resistors,

A diode is a semiconductor device that allows current to flow in one direction only.

• Diodes are made of semiconductor materials such as silicon or germanium.

• They have two terminals - an anode (positive) and a cathode (negative).

• When a voltage is applied across the diode in the forward direction, it allows current to flow.

• In the reverse direction, the diode blocks the current flow.

• Diodes are commonly used in rectifiers, ...read more

A diode is a semiconductor device that allows current to flow in one direction only. Types include PN junction diode, Zener diode, Schottky diode, and LED.

• Diode is a semiconductor device with two terminals that allows current to flow in one direction only

• Types of diodes include PN junction diode, Zener diode, Schottky diode, and LED

• PN junction diode is the most common type, made of P-type and N-type semiconductor mater...read more