Avantra by Trends Interview Questions and Answers

V.F.D stands for Variable Frequency Drive and it is used to control the speed of an electric motor.

• V.F.D is an electronic device that converts fixed frequency and voltage input to a variable frequency and voltage output.

• It is commonly used in industrial applications to control the speed of motors, pumps, fans, and other equipment.

• By adjusting the frequency and voltage, V.F.D allows for precise control of motor speed, resulting in energy savings and improved performance.

• For ex...read more

The formula to convert degree Celsius to Fahrenheit is F = (C * 9/5) + 32.

• Multiply the Celsius temperature by 9/5.

• Add 32 to the result.

• The final value is the temperature in Fahrenheit.

A fire alarm system is a network of devices that detect and alert people to the presence of fire or smoke in a building.

• Fire alarm systems are designed to provide early warning and help evacuate occupants in case of a fire emergency.

• They consist of various components such as smoke detectors, heat detectors, fire alarm control panels, and notification devices.

• When a fire is detected, the system activates alarms, strobe lights, and sometimes sprinkler systems to suppress the fi...read more

A smoke detector works by detecting smoke particles in the air and triggering an alarm to alert occupants of a potential fire.

• Smoke detectors use either ionization or photoelectric sensors to detect smoke particles.

• Ionization smoke detectors use a small amount of radioactive material to ionize the air, creating a small electrical current. When smoke enters the detector, it disrupts the current and triggers the alarm.

• Photoelectric smoke detectors use a light source and a light...read more

Types of air compressors include reciprocating, rotary screw, centrifugal, and scroll compressors.

• Reciprocating compressors use a piston to compress air.

• Rotary screw compressors use two interlocking screws to compress air.

• Centrifugal compressors use a rotating impeller to accelerate air and then convert the kinetic energy into pressure.

• Scroll compressors use two spiral-shaped scrolls to compress air.

A refrigeration cycle is a thermodynamic cycle that removes heat from a low-temperature space and transfers it to a high-temperature space.

• The refrigeration cycle consists of four main components: compressor, condenser, expansion valve, and evaporator.

• The compressor compresses the refrigerant gas, increasing its temperature and pressure.

• The high-pressure, high-temperature refrigerant gas then flows into the condenser, where it releases heat and condenses into a liquid.

• The liq...read more

The refrigerant used in air conditioning systems is a substance that undergoes phase changes to absorb and release heat.

• Refrigerants are chemicals that have low boiling points and can easily change from a gas to a liquid and back again.

• They are used in air conditioning systems to transfer heat from the indoor environment to the outdoor environment.

• Common refrigerants used in AC systems include R-410A, R-22, and R-134a.

• These refrigerants have different properties and environme...read more