Compass Group Support Services Hvac Technician Interview Questions, Process, and Tips

Q1. Types of Flow meter
Ans. 
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)
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Q2. Calibration of Control valve
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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
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Q1. 1 What is transformer and safety 2 PM activity of mcc panel, PCC panel
Ans. 
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
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Q2. What is DG and how its working
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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
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Q1. Ventilation and air condition
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Q2. Air condition technician
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Q3. Maintain shift schedule
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Q4. Knowledge of various tools testing equipment
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Q1. What is Ups? And How it Works
Ans. 
UPS stands for Uninterruptible Power Supply. It is an electrical device that provides emergency power to a load when the input power source fails.
• UPS works by converting DC power from a battery to AC power that can be used by the load.

• It provides immediate power backup during power outages, preventing data loss and equipment damage.

• UPS can also regulate voltage and frequency, protecting the load from power surges and s...read more
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Q2. What is AHU and How it Works
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AHU stands for Air Handling Unit. It is a device used to regulate and circulate air as part of a heating, ventilating, and air-conditioning (HVAC) system.
• AHU is responsible for filtering, heating, cooling, humidifying, and dehumidifying the air.

• It consists of a blower, heating and cooling elements, filters, and dampers.

• The blower pulls in air from the outside and passes it through the filters to remove impurities.

• The a...read more
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Q3. What is AC and Types of AC
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AC stands for Alternating Current. There are two types of AC - Single Phase and Three Phase.
• AC is a type of electrical current that periodically reverses direction.

• Single Phase AC is commonly used in households and small businesses.

• Three Phase AC is used in industrial and commercial settings.

• AC power is generated by power plants and transmitted through power lines.

• AC voltage and frequency vary depending on the country ...read more
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Q4. BMS Work CCTV operation
Ans. 
BMS Work CCTV operation involves monitoring and controlling CCTV systems through a Building Management System.
• BMS Work CCTV operation is a part of building automation systems that allows for remote monitoring and control of CCTV systems.

• It involves integrating CCTV systems with the BMS to enable real-time monitoring and control of cameras, recording devices, and other related equipment.

• BMS Work CCTV operation can be us...read more
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Electrical maintenance

Q1. What is starter and starter circuit?
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A starter is an electrical device that starts and stops a motor by providing the necessary power to it. The starter circuit is the electrical circuit that controls the starter.
• A starter is typically composed of a contactor, overload relay, and control circuit.

• The starter circuit includes components such as switches, relays, fuses, and wiring.

• The starter circuit is responsible for providing power to the starter and ensu...read more
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Q2. What is transformer?Types of transformer ?
Ans. 
A transformer is an electrical device that transfers electrical energy between two or more circuits through electromagnetic induction.
• Transformers are used to increase or decrease the voltage in electrical power transmission and distribution systems.

• They consist of two or more coils of wire, known as windings, that are wound around a core made of magnetic material.

• The primary winding receives electrical energy from the...read more
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Q3. What is circuit breaker? types of circuit breaker?
Ans. 
A circuit breaker is an electrical switch that automatically interrupts the flow of current in a circuit.
• Circuit breakers are used to protect electrical circuits from overloads, short circuits, and faults.

• They are designed to open and close the circuit under normal and abnormal conditions.

• Common types of circuit breakers include thermal, magnetic, and thermal-magnetic circuit breakers.

• Thermal circuit breakers use a bim...read more
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Q4. What is generator? working principle of generator?
Ans. 
A generator is a device that converts mechanical energy into electrical energy.
• Generators work on the principle of electromagnetic induction.

• They consist of a rotor and a stator, with the rotor rotating inside the stator.

• The rotation of the rotor creates a magnetic field, which induces an electrical current in the stator windings.

• The electrical output of a generator can be AC or DC, depending on the design.

• Examples of ...read more
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Q5. What is mcb? working principle of mcb?
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MCB stands for Miniature Circuit Breaker. It is an electrical switch that automatically trips when the current exceeds its rating.
• MCB is a type of circuit breaker that is commonly used in residential and commercial buildings.

• It is designed to protect electrical circuits from damage caused by overloading or short circuits.

• The working principle of MCB is based on the thermal and magnetic properties of the materials used ...read more
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Q1. Why should we hire you?
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Q2. What are your strengths and weaknesses?
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Q3. Where do you see yourself in 5 years?
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Q4. Why are you looking for a change?
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Q5. Share details of your previous job.
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Q6. What is your family background?
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Q7. What are your salary expectations?
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Q8. Tell me about yourself.
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