BVG India Technician Interview Questions and Answers

Current is the flow of electric charge in a circuit.

• Current is measured in Amperes (A)

• It is the rate of flow of electric charge through a conductor

• Direct current (DC) flows in one direction, while alternating current (AC) changes direction periodically

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

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

• They consist of a switch mechanism and a tripping mechanism that activates when a fault is detected.

• Circuit breakers can be reset manually or automatically after tripping.

• Example...read more

A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.

• Consists of two coils of wire (primary and secondary) wrapped around a core

• Primary coil receives electrical energy and creates a magnetic field

• Magnetic field induces a voltage in the secondary coil, transferring energy

• Used in power distribution, voltage regulation, and electrical isolati...read more

Resistance values are often color coded on resistors to easily identify their resistance value.

• Color coding is used on resistors to indicate their resistance value

• The colors represent numbers according to a specific color code chart

• The first two bands represent the first two digits of the resistance value, the third band represents the multiplier, and the fourth band represents the tolerance

• For example, a resistor with...read more

The symbol of a diode is an arrow pointing towards a line, representing the flow of current in one direction only.

• Arrow pointing towards a line

• Flow of current in one direction only

A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction. Safety measures are important to prevent accidents and ensure proper functioning of transformers.

• A transformer is used to step up or step down voltage levels in electrical systems.

• It consists of two or more coils of wire, known as windings, which are wound around a core made of magnetic...read more

DG stands for Diesel Generator. It is a type of generator that uses diesel fuel to produce electrical energy.

• DG is commonly used as a backup power source in case of power outages.

• It consists of an engine that runs on diesel fuel and an alternator that converts mechanical energy into electrical energy.

• DG sets are often used in industries, commercial buildings, and residential complexes.

• They are capable of providing powe...read more

Chillers operate by removing heat from a liquid through a refrigeration cycle.

• Chillers use a compressor to compress refrigerant gas, which then condenses into a liquid.

• The liquid refrigerant is then pumped through an evaporator, where it absorbs heat from the chilled water.

• The refrigerant then returns to the compressor to repeat the cycle.

• Chillers can be air-cooled or water-cooled, depending on the application.

• Chillers...read more

Actuator is a device that converts electrical energy into mechanical motion.

• Actuators are used in HVAC systems to control the flow of air, water, or steam.

• They can be electric, pneumatic, or hydraulic.

• Examples of actuators include valves, dampers, and motors.

• Actuators are essential for maintaining temperature, humidity, and air quality in HVAC systems.

Flow meters are devices used to measure the flow rate of a fluid in a pipe or conduit.

• Differential Pressure Flow Meters (Orifice, Venturi, Pitot Tube)

• Velocity Flow Meters (Turbine, Electromagnetic, Ultrasonic)

• Positive Displacement Flow Meters (Rotary, Oval Gear, Nutating Disk)

• Mass Flow Meters (Coriolis, Thermal, Weighing)

• Open Channel Flow Meters (Flume, Weir)

Calibration of control valve involves adjusting the valve to ensure it opens and closes at the correct set points.

• Calibration involves adjusting the valve's position to match the desired input signal.

• Use calibration tools such as pressure gauges, flow meters, and positioners to adjust the valve.

• Perform calibration regularly to ensure the valve operates accurately and efficiently.

• Document calibration procedures and resu...read more

Resistance values are often color coded on resistors to easily identify their resistance value.

• Color coding is used on resistors to indicate their resistance value

• The colors represent numbers according to a specific color code chart

• The first two bands represent the first two digits of the resistance value, the third band represents the multiplier, and the fourth band represents the tolerance

• For example, a resistor with...read more

The symbol of a diode is an arrow pointing towards a line, representing the flow of current in one direction only.

• Arrow pointing towards a line

• Flow of current in one direction only