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Communications and HVAC MCQ

What does HFO stand for?

Hydrofluorocarbon

High Frequency Oscillation

Hydrofluoroolefin

Hybrid Fuel Operated

Answer

Correct Answer: Hydrofluoroolefin

Note: This Question is unanswered, help us to find answer for this one

Which of the following is not a benefit of HFC refrigerant gas?

Inexpensive

High global warming

Easy to find

Zero ODP

Answer

Correct Answer: Zero ODP

Note: This Question is unanswered, help us to find answer for this one

What is a hemi-anechoic chamber?

A room that amplifies sound

A room with no sound

A room designed to completely absorb reflections of either sound or electromagnetic waves

A room that reflects sound

Answer

Correct Answer: A room designed to completely absorb reflections of either sound or electromagnetic waves

Note: This Question is unanswered, help us to find answer for this one

What is heat transfer?

The movement of thermal energy from hot to cold

The study of how different materials affect heat

The exchange of thermal energy between two interacting media passing through a heat exchanger

The process of heat moving from one object to another

Answer

Correct Answer: The exchange of thermal energy between two interacting media passing through a heat exchanger

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What is a heat exchanger?

A device used to measure the temperature of a liquid or gas.

A device used to create hot or cold water.

A device used to heat or cool a fluid.

A piece of equipment built for efficient heat transfer between two physically separated fluids.

Answer

Correct Answer: A piece of equipment built for efficient heat transfer between two physically separated fluids.

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Which of the following is the correct unit for heat capacity?

Kelvin

Joule

Fahrenheit

Celsius

Answer

Correct Answer: Kelvin

Note: This Question is unanswered, help us to find answer for this one

What is the HCFC?

Hydrochlorofluorocarbon

Hydrofluorocarbon

Chlorofluorocarbon

Halocarbon

Answer

Correct Answer: Hydrochlorofluorocarbon

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What is the GWP of natural refrigerants?

5000-10000

<20

1000-4000

>20000

Answer

Correct Answer: <20

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What is a glycol-cooled system?

A type of engine coolant made with equal parts water and glycol

A type of refrigerant that is used in some air conditioning systems

A type of air conditioning system using a water/glycol solution as a condensing medium

A device that is used to measure the freezing point of a glycol solution

Answer

Correct Answer: A type of air conditioning system using a water/glycol solution as a condensing medium

Note: This Question is unanswered, help us to find answer for this one

What is the normal pressure that a gauge is zeroed at?

Atmospheric pressure (one bar absolute or 14.7 psi)

10 psi

100 psi

1 psi

Answer

Correct Answer: Atmospheric pressure (one bar absolute or 14.7 psi)

Note: This Question is unanswered, help us to find answer for this one

What is the normal atmospheric pressure?

24.5 psi

12.1 psi

10.2 psi

14.7 psi

Answer

Correct Answer: 14.7 psi

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What is the purpose of free cooling?

To encourage the use of fresh air for cooling the space

To reduce the costs of operating a water cooled or glycol cooled system

To provide free cooling for up to 80% of their operating life

To reduce or eliminate compressor operation

Answer

Correct Answer: To reduce or eliminate compressor operation

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What does "footprint" mean in the context of air conditioning?

The speed at which an air conditioning unit moves

The area or space that an air conditioning unit takes up when applied

The Manufacturer of the air conditioning unit

The weight or pressure an air conditioning unit applies

Answer

Correct Answer: The area or space that an air conditioning unit takes up when applied

Note: This Question is unanswered, help us to find answer for this one

What is a fluorocarbon?

A gas

An element on the periodic table

A chemical containing fluorine and carbon

A liquid

Answer

Correct Answer: A chemical containing fluorine and carbon

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What does a filter-drier remove from a refrigeration system?

H2O

CO2

Answer

Correct Answer: H2O

Note: This Question is unanswered, help us to find answer for this one

What does a Filter-Drier do?

Remove O2

Remove CO2

Remove H2O

Add H2O

Answer

Correct Answer: Remove H2O

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What year was the EU regulation introduced?

2008

2006

2009

2007

Answer

Correct Answer: 2007

Note: This Question is unanswered, help us to find answer for this one

What does the EU regulation from 2007 impact?

The import of goods into the EU

Use of fluorine based refrigerants

The carbon emissions of vehicles

The size of packaging for goods sold within the EU

Answer

Correct Answer: Use of fluorine based refrigerants

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What are F-gases?

A mineral found in some rocks

A gas that is released when fluoroacetic acid decomposes

A type of bird found in North America

A family of man-made gases used in a range of air conditioning and refrigeration applications

Answer

Correct Answer: A family of man-made gases used in a range of air conditioning and refrigeration applications

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What is a fan coil unit?

A device used in HVAC systems that consists of a heating and/or cooling coil, fan, and local controller.

A device used in HVAC systems that consists of a heating and/or cooling coil and local controller.

A device used in HVAC systems that consists of a heating and/or cooling coil, fan, valve/s and local controller.

A device used in HVAC systems that consists of a heating and/or cooling coil, fan, valve/s, and controller.

Answer

Correct Answer: A device used in HVAC systems that consists of a heating and/or cooling coil, fan, valve/s and local controller.

Note: This Question is unanswered, help us to find answer for this one

What is the expansion valve?

A device that regulates the amount of refrigerant flowing from the liquid line into the evaporator.

A device that regulates the amount of water flowing from the tap

A device that regulates the amount of electricity flowing to your house

A device that regulates the amount of gas in your car

Answer

Correct Answer: A device that regulates the amount of refrigerant flowing from the liquid line into the evaporator.

Note: This Question is unanswered, help us to find answer for this one

What is the temperature at which a given refrigerant vaporises within an evaporator?

Boiling temperature

Evaporating temperature

Freezing temperature

Melting temperature

Answer

Correct Answer: Evaporating temperature

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What is an evaporator coil?

A coil that helps with the process of photosynthesis

A type of engine used in race cars

A coil that is located indoors and helps with refrigeration

A machine that helps with evaporation

Answer

Correct Answer: A coil that is located indoors and helps with refrigeration

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What does the SEER rating number represent?

Equipment energy efficiency

Seasonal energy efficiency of the equipment

Europe market

Single-condition energy efficiency of the equipment

Answer

Correct Answer: Seasonal energy efficiency of the equipment

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What does ERE stand for?

Energy Reuse Effort

Energy Reuse Effectiveness

Energy Reuse Efficiency

Energy Reuse Export

Answer

Correct Answer: Energy Reuse Effectiveness

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What is the definition of Entropy?

The rate at which heat is absorbed into an object.

The study of energy

The amount of disorder in a system

A measure of the amount of work that can be done by a system

Answer

Correct Answer: The rate at which heat is absorbed into an object.

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What is the thermodynamic property of a substance defined as its total internal energy plus the total heat & heat content?

Kinetic Energy

Enthalpy

Mass

Potential Energy

Answer

Correct Answer: Enthalpy

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What is the key purpose of the Enhanced Capital Allowance Scheme?

To provide businesses with enhanced tax relief for investments in renewable energy equipment

To provide businesses with enhanced tax relief for investments in energy-saving equipment

To provide businesses with enhanced tax relief for investments in environmentally-friendly equipment

To provide businesses with enhanced tax relief for investments in energy-efficient equipment

Answer

Correct Answer: To provide businesses with enhanced tax relief for investments in energy-saving equipment

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What is the ECA Scheme?

A way to improve energy efficiency

A key part of the Government’s programme to manage climate change

A way to provide businesses with enhanced tax relief

A way to reduce energy use

Answer

Correct Answer: A key part of the Government’s programme to manage climate change

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What is the function of an EEV?

It is a device used to control the expansion of metals.

It is a type of electrical switch.

To maintain close control of the evaporator superheat.

It is used as an expansion valve in automobile engines.

Answer

Correct Answer: To maintain close control of the evaporator superheat.

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What does EER stand for?

Energy Excitement Rating

Energy Efficiency Ratio

Energy Excellence Record

Enhanced Energy Reduction

Answer

Correct Answer: Energy Efficiency Ratio

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What is an economiser?

A mechanical device used to reduce energy consumption

A device used to store energy

A device used to generate energy

A device used to increase energy consumption

Answer

Correct Answer: A mechanical device used to reduce energy consumption

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What is the main advantage of using EC fans?

They are easier to install

They are cheaper to produce

They last longer

They are more efficient than other types of fans

Answer

Correct Answer: They are more efficient than other types of fans

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What is the primary use of ducts?

To circulate cold water

To circulate hot water

To deliver and remove air in HVAC systems

To distribute electrical wiring

Answer

Correct Answer: To deliver and remove air in HVAC systems

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What does "Downflow" refer to?

A type of air conditioning system that recirculates air

A type of air conditioning system that discharges air downward

A type of air conditioning system that does not use Freon

A type of air conditioning system that is not energy efficient

Answer

Correct Answer: A type of air conditioning system that discharges air downward

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What is the expansion device in a Direct Expansion System used for?

To extract heat in the evaporator

To reject heat in the evaporator

To extract heat in the condenser

To extract waste heat in the refrigeration equipment

Answer

Correct Answer: To extract heat in the evaporator

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What is the definition of density?

The weight of a unit volume of a substance.

The amount of matter in an object.

The force that attracts objects towards the center of the Earth.

The amount of space that an object takes up.

Answer

Correct Answer: The weight of a unit volume of a substance.

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What is the process of removing moisture from the air within a conditioned space to maintain the required humidity level called?

Condensation

Dehumidification

Hydration

Evaporation

Answer

Correct Answer: Dehumidification

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What is the use of decant/receiver?

For storing refrigerant during production.

For temporary storage of refrigerant during maintenance.

For permanent storage of refrigerant.

For storing refrigerant during transportation.

Answer

Correct Answer: For temporary storage of refrigerant during maintenance.

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Hat is a data centre?

A facility used to process data

A facility used to store data

A facility used to house computer systems

A facility used to house telecommunications systems

Answer

Correct Answer: A facility used to house computer systems

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What is a damper?

A device for controlling air temperature.

A modulating device for controlling airflow rates through ductwork or air handling equipment.

A device for measuring humidity.

A device for measuring air pressure.

Answer

Correct Answer: A modulating device for controlling airflow rates through ductwork or air handling equipment.

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What does CWR stand for?

Chilled water return

Cooling water return

Chilled water line

Cold water return

Answer

Correct Answer: Chilled water return

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What does the acronym "CRAH" stand for?

Cooling, Reliability, and Application of Heat

Computer Room Air Handling unit

Climate Responding Automated Home

None of the above

Answer

Correct Answer: Computer Room Air Handling unit

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What does CRAC stand for?

Continuous Roll Air Conditioning

Climate-Controlled Radon Attenuation

Computer Room Air Conditioning

Centralized Radio Access Control

Answer

Correct Answer: Computer Room Air Conditioning

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What is the COP?

The higher the number, the more efficient the system.

The ratio of the refrigerant effect (total capacity) versus the work by the compressor over a unit of time.

The work by the compressor over a unit of time.

The refrigerant effect (total capacity)

Answer

Correct Answer: The ratio of the refrigerant effect (total capacity) versus the work by the compressor over a unit of time.

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What is a cooling tower?

A water conservation device used to supply water for cooling condensers.

A device used to produce electricity

A structure built around a nuclear reactor

A machine used to cool water

Answer

Correct Answer: A water conservation device used to supply water for cooling condensers.

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Convection is the transfer of heat by _____?

Radiation

Conduction

Contact

Changes of density in a fluid or gas

Answer

Correct Answer: Changes of density in a fluid or gas

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A control system that applies regulation to a heating and/or air conditioning system is what?

An air conditioning system

A regulating device

A heating system

A sensing device

Answer

Correct Answer: A sensing device

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What is the main difference between a CAV system and a variable air volume (VAV) system?

The supply air temperature is constant in a CAV system, but variable in a VAV system.

The supply air flow rate is variable in a CAV system, but constant in a VAV system.

The supply air flow rate is constant in a CAV system, but variable in a VAV system.

There is no difference between a CAV system and a VAV system.

Answer

Correct Answer: The supply air flow rate is constant in a CAV system, but variable in a VAV system.

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In a CAV system, what is varied to meet the thermal loads of a space?

Supply air temperature

Air flow rate

Thermal loads

Supply air flow rate

Answer

Correct Answer: Supply air temperature

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What is the transfer of heat by the movement of electrons called?

Radiation

Friction

Convection

Conduction

Answer

Correct Answer: Conduction

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What is a condensing unit?

A device that is used to humidify air

A part of a refrigeration/air conditioning system comprising a compressor, motor and condenser heat exchanger

A device that is used to heat air

A device that is used to cool air

Answer

Correct Answer: A part of a refrigeration/air conditioning system comprising a compressor, motor and condenser heat exchanger

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What does a condenser do?

Increases the temperature of a refrigerant liquid

Removes the superheat of compression, condensing the refrigerant gas into a high pressure liquid.

Converts a refrigerant gas into a refrigerant liquid

Decreases the pressure of a refrigerant gas

Answer

Correct Answer: Removes the superheat of compression, condensing the refrigerant gas into a high pressure liquid.

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What is the dew point?

The highest temperature a substance can reach before it changes to a gas

The temperature at which condensation will occur

The temperature at which a gas will change to a liquid

The lowest temperature a substance can reach before it changes to a solid

Answer

Correct Answer: The temperature at which condensation will occur

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What is Condensate?

Moisture removed from the air when it is cooled below its dew point

A gas

A material used for insulation

A type of HVAC system

Answer

Correct Answer: Moisture removed from the air when it is cooled below its dew point

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What is the key component of the refrigeration system?

Receiver

Condenser

Evaporator

Compressor

Answer

Correct Answer: Compressor

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What does commissioning a service ensure?

That equipment will be replaced if it breaks

That the system is running at optimal performance

That equipment is set up to function correctly, as per the specification.

That the equipment is clean and free of dirt

Answer

Correct Answer: That equipment is set up to function correctly, as per the specification.

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What does commercial air conditioning provide?

Suitable ventilation and space conditioning

Air conditioning for small buildings

Air conditioning for private homes

Air conditioning for public buildings

Answer

Correct Answer: Suitable ventilation and space conditioning

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Comfort air conditioning systems are designed for _______ .

The comfort of people, livestock, etc.

The protection of computer-based electrical systems

The comfort of people only

Other process operations requiring close control of the environment

Answer

Correct Answer: The comfort of people, livestock, etc.

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What is a cold aisle?

The front of the server racks

A layout design for server racks and other computing equipment in a data centre.

A measure of temperature

A type of CPU

Answer

Correct Answer: A layout design for server racks and other computing equipment in a data centre.

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What provides heat transfer to air when mounted inside an air handling unit or ductwork?

Condenser

Coil

Evaporator

Compressor

Answer

Correct Answer: Coil

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What is the other name for close control/climate control?

Precision Air Conditioning

Whole-house fan

Central Air Conditioning

Humidifier

Answer

Correct Answer: Precision Air Conditioning

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What is a clean room?

An environment with a low level of environmental pollutants

A room without windows

A room that is physically clean

A room without furniture

Answer

Correct Answer: An environment with a low level of environmental pollutants

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What is the website of CITB?

www.tibc.uk

www.ctib.uk

www.citb.co.uk

www.cibt.uk

Answer

Correct Answer: www.citb.co.uk

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What does CITB stand for?

Council of Industrial Training Boards

Children in The Theater Bureau

Creative Industries Training Board

Construction Industry Training Board

Answer

Correct Answer: Construction Industry Training Board

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What does CIBSE stand for?

Chartered Institution of Building Services Engineers

Construction Institute of Building Services Engineers

Chartered Institute of Building and Safety Engineering

Chartered Institute of Business Science and Economics

Answer

Correct Answer: Chartered Institution of Building Services Engineers

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How does a chiller work?

By cooling a secondary cooling medium

By removing heat from a secondary cooling medium

By circulating a secondary cooling medium

By heating a secondary cooling medium

Answer

Correct Answer: By removing heat from a secondary cooling medium

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What is a chilled water system?

A type of air conditioning system using air (or glycol solutions) as a primary cooling medium.

A type of heating system using air (or glycol solutions) as a primary heating medium.

A type of heating system using water (or glycol solutions) as a secondary heating medium.

A type of air conditioning system using water (or glycol solutions) as a secondary cooling medium.

Answer

Correct Answer: A type of air conditioning system using water (or glycol solutions) as a secondary cooling medium.

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What is the primary cooling medium in a chilled water system?

Water

Glycol solutions

Refrigerant

Air

Answer

Correct Answer: Refrigerant

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What is a change of state?

A change from one phase to another – solid, liquid or gas.

A change in size or shape.

A physical or chemical property.

A physical or chemical change.

Answer

Correct Answer: A change from one phase to another – solid, liquid or gas.

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What does CFM stand for?

Cubic feet per minute

Cubic furlongs per minute

Central foundry machine

Cut forget me nots

Answer

Correct Answer: Cubic feet per minute

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What is the full form of CFCs?

Chlorofluorocarbons

Chlorofluorocarbonated Hydrocarbons

Chlorinated Fluorocarbons

Carbonated Fluorine Compounds

Answer

Correct Answer: Chlorofluorocarbons

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When were CFCs banned?

1995

2000

2010

1985

Answer

Correct Answer: 2000

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What is the ideal application for a cassette air conditioning unit?

Small open plan areas

Large open plan areas or irregular shaped rooms

Outdoor areas

Regular shaped rooms

Answer

Correct Answer: Large open plan areas or irregular shaped rooms

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What is the Cascade system?

A system with two or more refrigerant circuits working in series to provide the designated level of cooling.

A system that uses a single refrigerant circuit to provide the designated level of cooling.

A system with two or more refrigerant circuits working in parallel to provide the designated level of cooling.

A system that does not use refrigerant to provide the designated level of cooling.

Answer

Correct Answer: A system with two or more refrigerant circuits working in series to provide the designated level of cooling.

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What is the best use for a capillary tube?

Constant ambient conditions

To measure pressure

To create vacuum

To meter flow

Answer

Correct Answer: Constant ambient conditions

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What is a capillary tube?

A device used to measure the flow of blood

A device used to measure the flow of air.

A metering device consisting of a small diameter tube designed to restrict flow.

A device used to measure the flow of water

Answer

Correct Answer: A metering device consisting of a small diameter tube designed to restrict flow.

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What is the bubble point?

The temperature at which a refrigerant gas starts to liquefy.

The pressure at which a refrigerant gas starts to liquefy.

The pressure at which a refrigerant liquid starts to vaporise.

The temperature at which a refrigerant liquid starts to vaporise.

Answer

Correct Answer: The pressure at which a refrigerant liquid starts to vaporise.

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What is the quantity of heat required to be given to or taken from 1lb. of water in British Thermal Units?

1 m

1°C

1 kg

1°F

Answer

Correct Answer: 1°F

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How long has BREEAM been established for?

Since 1996

Since 1999

Since 2002

Since 1991

Answer

Correct Answer: Since 1991

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What is BREEAM?

BRE Environmental Assessment Methodology

Building Research Establishment Environmental Assessment Methodology

The world’s longest established and most widely used method of assessing, rating, and certifying the sustainability of buildings

Building Research Establishment

Answer

Correct Answer: The world’s longest established and most widely used method of assessing, rating, and certifying the sustainability of buildings

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What is the maximum number of refrigerants that can be blended in a regular blend?

Answer

Correct Answer: 10

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What is BEMS?

British Educational Measurement Services

Building Equipment Management System

Bureau of Economic Measurement and Statistics

Building Energy Management System

Answer

Correct Answer: Building Energy Management System

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What is the temperature called where a liquid mixture boils and produces a vapour with exactly the same composition as the liquid?

Melting point

Boiling point

Azeotropic point

Freezing point

Answer

Correct Answer: Azeotropic point

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Azeotropes can be separated into its parts by which process?

Cracking

Dehydration

Fractional distillation

Distillation

Answer

Correct Answer: Distillation

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What does ASHRAE stand for?

American Society of Heating and Air-Conditioning Engineers

American Society of Heating, Refrigerating, and Air-Conditioning Engineers

Air-Conditioning, Heating, and Refrigerating Engineers

American Standard of Heating and Air-Conditioning Engineers

Answer

Correct Answer: American Society of Heating, Refrigerating, and Air-Conditioning Engineers

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What is the application?

The act of applying pressure

The action of putting something into operation

The location or site where an air conditioning/cooling system or unit is to be installed

The process of applying for something

Answer

Correct Answer: The location or site where an air conditioning/cooling system or unit is to be installed

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What is the meaning of Ambient?

Increased atmospheric conditions of temperature & pressure

Abnormal atmospheric conditions of temperature & pressure

Normal atmospheric conditions of temperature & pressure

Decreased atmospheric conditions of temperature & pressure

Answer

Correct Answer: Normal atmospheric conditions of temperature & pressure

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What does an air handling unit do?

Provide suitable ventilation and extract

Provide cooling

Provide air conditioning

Provide heating

Answer

Correct Answer: Provide suitable ventilation and extract

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What is an air diffuser?

A type of light bulb

Device for makingrequest for help

A device that makes a fluid heavier

Air distribution outlet or grill designed to direct and develop balanced airstreams.

Answer

Correct Answer: Air distribution outlet or grill designed to direct and develop balanced airstreams.

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What does an air-cooled system use as the transfer medium to reject heat from the refrigerant in the condenser?

Water

Steam

Air

Ice

Answer

Correct Answer: Air

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What is an air conditioner?

A device that removes heat from air

A device that adds heat to air

A device that controls the amount of humidity in the air

An appliance, system, or mechanism designed to control temperature, humidity and air quality in a defined space.

Answer

Correct Answer: An appliance, system, or mechanism designed to control temperature, humidity and air quality in a defined space.

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What is the process of reducing heat through a change in air pressure caused by volume expansion?

Radiation

Convection

Adiabatic cooling

Conduction

Answer

Correct Answer: Adiabatic cooling

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What does ACRIB stand for?

Air Conditioning, Refrigeration, and Insulation Board

Association of Certified Refrigeration Installers and Technicians

Air Conditioning and Refrigeration Industry Board

Association of Club Referees in Britain

Answer

Correct Answer: Air Conditioning and Refrigeration Industry Board

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What does ACIS stand for?

Association for Computing Machinery's International Science

Airedale Centre for Integrated Solutions

Airedale Controls Integrated Systems

Available Computing for Interdisciplinary Science

Answer

Correct Answer: Airedale Controls Integrated Systems

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AC fans are powered by

A DC motor

An AC power supply

An AC motor

An AC generator

Answer

Correct Answer: An AC motor

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What is the full form of AC?

Authority control

Amplitude modulation

Alternating Current

Air Conditioner

Answer

Correct Answer: Alternating Current

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What is an accumulator?

A device that takes in air and blows it out

A device that stores electrical energy

A device that assessment the value of something

A storage tank that receives liquid refrigerant from the evaporator and prevents it from flowing back into the compressor.

Answer

Correct Answer: A storage tank that receives liquid refrigerant from the evaporator and prevents it from flowing back into the compressor.

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What is the formula for absolute pressure?

Gauge pressure = Absolute pressure - atmospheric pressure

Absolute pressure = 2 x Gauge pressure

Gauge pressure = 2 x atmospheric pressure

Absolute pressure = Gauge pressure + atmospheric pressure

Answer

Correct Answer: Absolute pressure = Gauge pressure + atmospheric pressure

Note: This Question is unanswered, help us to find answer for this one

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