Mosanada FMS Interview Questions and Answers for Experienced

Safety of chiller includes proper installation, regular maintenance, and following safety protocols.

• Proper installation to prevent leaks and malfunctions

• Regular maintenance to ensure efficient and safe operation

• Following safety protocols such as wearing appropriate PPE and avoiding contact with hot surfaces

• Ensuring proper ventilation to prevent overheating

A VFD (Variable Frequency Drive) controls the speed of an AC motor by varying the frequency and voltage of the power supplied to the motor.

• VFD converts fixed frequency AC power to variable frequency AC power

• It adjusts the motor speed by changing the frequency of the electrical power supplied to the motor

• VFDs are commonly used in HVAC systems, pumps, conveyors, and other industrial applications

Superheating is the process of heating a substance above its boiling point without it changing into a gas.

• Superheating occurs in steam boilers when steam is heated beyond its saturation temperature.

• It increases the energy content of the steam and improves efficiency in power generation.

• Superheating is important in industrial processes where precise temperature control is required.

There are two main types of compressors: positive displacement compressors and dynamic compressors.

• Positive displacement compressors: Reciprocating, rotary screw, rotary vane

• Dynamic compressors: Centrifugal, axial flow

PPM stands for Planned Preventative Maintenance. It should be done every 3-6 months for chillers, AHUs, pumps, and other equipment.

• PPM is a proactive approach to maintenance to prevent breakdowns and prolong equipment life.

• Chillers, AHUs, pumps, and other critical equipment should undergo PPM every 3-6 months.

• Regular PPM helps in identifying potential issues early and ensures optimal performance of the equipment.

• PPM in...read more

There are mainly two types of pumps used in HVAC systems: centrifugal pumps and positive displacement pumps.

• Centrifugal pumps are commonly used in HVAC systems for circulating water or other fluids. They are efficient and have a simple design.

• Positive displacement pumps are used for applications where a specific flow rate is required, such as in hydronic heating systems.

• Other types of pumps used in HVAC systems include...read more

Check the pump motor temperature by touching the motor housing.

• Touch the motor housing with your hand to feel for excessive heat

• Use a temperature gun to measure the motor temperature

• Check for any unusual smells or sounds coming from the motor

• Monitor the motor's temperature gauge if available

When the pump motor is heated, it can lead to decreased efficiency, increased wear and tear, and potential damage to the motor.

• Decreased efficiency: Heat can cause the motor to work harder, leading to decreased efficiency in pumping water.

• Increased wear and tear: Excessive heat can accelerate the wear and tear of the motor components, reducing its lifespan.

• Potential damage: If the motor overheats, it can lead to perman...read more

The AHU belt size can vary depending on the specific model and manufacturer of the air handling unit.

• AHU belt size is typically specified by the manufacturer in the unit's documentation.

• It is important to refer to the AHU's manual or contact the manufacturer for the exact belt size needed.

• AHU belt sizes can range from small belts for residential units to larger belts for commercial or industrial units.

A chemical dosing system in a chiller is used to introduce specific chemicals into the water to prevent scaling, corrosion, and biological growth.

• It helps maintain the efficiency and longevity of the chiller system.

• Chemicals like corrosion inhibitors, biocides, and scale inhibitors are commonly used.

• The dosing system carefully controls the amount of chemicals added to the water based on the chiller's requirements.

SOP stands for Standard Operating Procedure. Lotto is a game of chance.

• SOP is a set of step-by-step instructions to carry out a specific task or operation.

• It ensures consistency and quality in the output.

• For example, a manufacturing company may have an SOP for assembling a product.

• Lotto is a game of chance where players select a set of numbers and hope to match them with the numbers drawn in a lottery.

• It is a popular f...read more

If wbt & dbt are equal, the air is fully saturated and the relative humidity is 100%.

• The air is fully saturated with water vapor.

• The relative humidity is 100%.

• Condensation may occur on surfaces due to the high moisture content in the air.

• This condition is known as the dew point temperature.

The frequency of eddy current test depends on the material being tested and the thickness of the material.

• The frequency can range from a few hundred Hz to several MHz

• Higher frequencies are used for thinner materials and lower frequencies for thicker materials

• The frequency also depends on the type of probe being used

• For example, a probe with a diameter of 1mm may have a frequency of 1MHz, while a probe with a diameter o...read more