Interview Questions and Answers

Primary, secondary, condenser, and AHU are components of a HVAC system.

• Primary and secondary refer to the two sides of a heat exchanger in the HVAC system.

• The primary side carries the hot fluid or refrigerant, while the secondary side carries the cool fluid or air.

• The condenser is a heat exchanger that removes heat from the refrigerant and converts it from a gas to a liquid.

• The AHU (Air Handling Unit) is responsible for circulating and conditioning the air in a building.

• It in...read more

There are several types of chiller safety measures that are implemented to ensure safe operation and prevent accidents.

• Safety measures include pressure relief valves to prevent overpressure

• Temperature sensors to monitor and control the chiller's operating temperature

• Flow switches to detect and prevent low or no flow conditions

• High-pressure switches to protect against excessive pressure

• Low-pressure switches to prevent damage due to low refrigerant pressure

• Oil level sensors to ...read more

There are several types of condensers used in various industries and applications.

• Air-cooled condenser

• Water-cooled condenser

• Shell and tube condenser

• Plate condenser

• Evaporative condenser

• Surface condenser

• Finned tube condenser

The refrigeration cycle is a process that removes heat from a space or substance to lower its temperature.

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

• The compressor increases the pressure and temperature of the refrigerant gas.

• The high-pressure gas then flows into the condenser where it releases heat and becomes a high-pressure liquid.

• The liquid refrigerant passes through the expansion valve, which reduces its pressure an...read more

An air conditioner is a device that cools and dehumidifies the air in a room or building.

• Air conditioners use refrigeration cycles to remove heat and moisture from the air.

• They consist of components such as compressors, condensers, evaporators, and fans.

• Air conditioners can be used for both cooling and heating purposes.

• Examples of air conditioners include window units, split systems, and central air conditioning systems.

The resistance is measured in ohms.

• Resistance is a measure of how much a material opposes the flow of electric current.

• The unit of resistance is ohms (Ω).

• Resistance can be calculated using Ohm's Law: R = V/I, where R is resistance, V is voltage, and I is current.

• Resistance can vary depending on the material, length, and cross-sectional area of a conductor.

• For example, a copper wire with a length of 1 meter and a cross-sectional area of 1 square millimeter has a resistance of ...read more