CT6
HVAC Knowledge Quiz
Test your knowledge on Heating, Ventilation, and Air Conditioning (HVAC) concepts with our comprehensive quiz! This quiz consists of 51 carefully crafted questions that cover various aspects of building climate control, ensuring you have a well-rounded understanding of the subject.
Whether you're a student, a professional in the field, or simply interested in learning more, this quiz is perfect for you. Key features include:
- Multiple choice questions
- Detailed explanations of correct answers
- Challenge your skills and knowledge
The heat gain due to the solar radiation through the windows of a building in the mid latitude reaches a maximum value for a North exposure at about?
9am December
2pm January
2pm June
1pm November
10am April
Consider a building with a North glazed facade, the other three walls beings blank. This configuration has a smaller cooling load than the same with the glazed facade oriented East or West because?
The maximum solar gain is greater for W and E
The internal heat loads decrease during winter
The maximum solar gain for this configuration occurs at the same time of peak minimum transmission load
For East and West facades the sun is lower in the sky at the time of peak cooling load
The solar radiation component reflected is greatest for the north facade
Which of the following solar shading methods would be most effective for reducing the summertime transmission heat load?
Concrete horizontal overhang
Internal vertical venetian blinds
Internal horizontal venetian blinds
External vertical louvres
Double glazing
Which of the shading devices, listed in question 3, would be most effective for reducing the summertime transmission heat load?
Concrete horizontal overhang
Internal vertical venetian blinds
Internal horizontal venetian blinds
External vertical louvres
Double glazing
The total cooling load on a building maybe represented as either Sensible and/or Latent, and either as a heat Gain and/or Loss to the air conditioning system. Which of the following is correct?
Solar radiation – Sen Loss
Transmission – Sen Lat Gain Loss
People – Sen Lat Gain Loss
Lighting – Sen Lat Gain
Outside air – Sen Lat Gain Loss
If the sun is momentarily obscured by dense cloud, the space temperature in an air conditioned building does not fall immediately because?
Diffuse solar radiation tends to make up the difference
The internal heat loads are approximately constant
Heat is liberated from the structure of the building
The increased outdoor air load is equal to the reduction
The transmission load through the walls increase when this happens
The space dry bulb temperature is normally set at a lower value in winter than in summer?
To save energy
Because outdoor air temperature is lower
To compensate for the reduced total heat gain
Because people tend to wear heavier clothing indoors
Because occupant activity level is less in winter
The indoor comfort temperature in summer can range from about 22*C to 27*C depending on the type of application. In which of the following buildings would a comfort temperature of 27*C probably be acceptable?
Commercial office
Restaurant
Supermarket
Private home
Hospital ward
Consider an independent air conditioned restaurant located in a large office building. Five possible reasons for zoning the restaurant separate from the main office air conditioning system are given. Which one is not a good and sufficient reason?
A greater proportion of fresh air is required
A greater sensible cooling load/m2 is to be expected
The supply air must be at a lower moisture content
The restaurant operates outside normal business hours
Cooking odours may migrate to other areas
The depth of a perimeter zone, measured from the outside wall depends on?
The anticipated minimum office size
The orientation of the facade
The ratio of centre: perimeter zone area
The floor to floor height
The glass: wall ratio
A large central heating system normally requires extra capacity to provide the start-up after a cold shut-down during winter. The amount of extra capacity is independent of?
The thermal mass of the building
The intensity of lighting and solar load during winter
The severity of the winter weather
The length of time required after start-up to achieve indoor comfort
The operating hours of the heating plant
A central cooling system (unlike a heating system) does not require extra chiller set capacity because?
The generation of chilled water only requires refrigeration
At the time peak cooling load the building’s structure has normally cooled down
Cooling equipment is relatively much more costly to install
The lights and business machines may be switched off during peak cooling load
The outdoor/indoor temperature differential is much less in summer
The equation Q = 1.21 x V x TD means that?
The total heat gain depends on the calculated refrigeration capacity
The latent heat gain depends on the sensible heat
The volume of air delivered depends on the sensible heat gain to the space
The latent heat depends on the temperature differential
The temperature differential depends on the volume of space
The air velocity in the ducts of a ‘Low velocity’ system lies within the range?
0 to 1 m/s
10 to 20 m/s
1 to 2 m/s
5 to 7 m/s
15 to 40 m/s
Brickwork ducts normally leak but are satisfactory for?
High pressure supply ducts
Medium pressure kitchen exhaust ducts
Exhaust ducts under positive pressure
Supply ducts under negative pressure
Exhaust ducts under negative pressure
Rectangular cross-section ducts have a limited ‘Aspect Ratio’. Which of the following ducts has a ratio greater than the limit?
250 x 75mm
75 x 250mm
75 x 350mm
400 x 75mm
3000 x 700mm
Variable volume terminal units are typically installed within the occupied space. When operating in cooling mode these units?
Deliver air at a variable temperature
Require both a chilled and hot water supply
Must be floor mounted to avoid noise
Supply air at a rate dependent on the cooling load
Do not require an individual thermostat
Which of the following is required for maximising the operating efficiency of a reserve-cycle heating unit during winter?
The entire unit must be located inside the space
The outdoor relative humidity must be greater than 50%
The winter outdoor temperature must be mild
A high pressure refrigerant is required
A large amount of refrigerant is required
The occupants of an air conditioned home have greater control over their own comfort than is possible in a commercial office because of several factors. Which of the following is not true for a variable volume system?
Their greater personal mobility at home
Their ability to change body insulation
Their ability to select thermostat setting
Their ability to open windows
The sensitivity of the thermostats
A variable volume air conditioning system has characteristics different from a constant volume system. Which of the following is not true for a variable volume system?
There is possibility of cold air dumping at low load
There may be reduced fresh air at partial load
A relatively simple duct system is required
A relatively large amount of energy is consumed
Systems are suitable for a very large number of zones
A constant volume air conditioning system has characteristics different from a variable system. Which of the following is not true for a constant volume system?
Air movement within the space is constant all year round
The fresh air supply rate is independent of the load
Energy consumption is greater
Multiple supply ducts are normally required
The air noise generated is marginally more disturbing
Air conditioned zones are usually required because of the heat load variations on a building. For a defined zone the variation in sensible heat gain in summer must be?
Greater than about 100 W/m2
Uniform over the whole area
Constant throughout the year
Mainly due to solar radiation
Always greater than the heat loss
Winter heating is not mandatory by building code for which of the following buildings?
Theatre auditorium
Commercial office
Maintenance depot
Department store
Private home
Multiple groups (e.g. high, medium and low rise) of passenger lifts are normally required in a large building when?
The number of stops above the ground floor exceeds 20
The speed for any lift car exceeds 9 m/s
The size of any lift car exceeds 28 passengers/car
The number of lifts for a single group exceeds 8
For any high rise office building
When comparing the suitability of moving walks and escalators of the same capacity which of the following is incorrect. A moving walk?
Cost about 50% more
Requires more floor space for installation
Can accommodate trolleys better
Gives a greater restriction to traffic flow when stopped
Requires a greater truss depth
Which of the following statements is incorrect. A comparison of ‘bottom drive’ and ‘top drive’ traction lifts would show that a bottom drive lift?
Is impracticable for greater than about 8 floors
Is limited to about 1 m/s car speed
Transmits more noise
Costs slightly more
Imposes much less load on the structure
A lift analysis for a proposed building shows that the waiting interval is worse, and the 5 minute handling capacity is better than required which of the following changes is suggested?
Increase the lift car size
Decrease the lift car speed
Increase the number of lifts
Decrease the lift car size
Increase the round trip time
The relationship between ‘Round Trip Time’ and ‘Waiting Interval’ depends on?
The car speed
The number of lifts
The lift car size
The number of floors served above ground
The expected up-peak demand
High speed lifts are particularly suitable when?
The building is greater than 25m high
More than 8 lifts are required
The car size exceeds the standard available
The acceleration/deceleration time is a small part of the total round trip time
The building is prestigious
Which of the following is not a relevant factor for estimating the waiting interval for s group of lifts?
The number of lifts in the group
The round trip time for one lift
The quality of service required
The type of lift drive
The size of the lift car
Electricity is generated at a frequency of 50Hz because?
This is the maximum frequency possible
Three phase equipment operates best a 50Hz
It allows the generators to be located far from the city
The generators run at 3000 revolutions per minute
This frequency gives the best power factor
In a three phase electrical power supply the neutral conductor?
Never carries any current
Is used only for single phase demand
Carries any unbalanced out-of-phase current
Acts as a back-up for earth protection
Carries the total three phase power supply
In a large building the principal use for D.C. Power is for?
Emergency use for driving small motors
External lighting at the main entrance
Back-up power for the telephone system
Emergency power for exit signs and stairway lighting
Operating small business machines
Electricity is transmitted at very high voltage over large distances because this?
Reduces the high electrical resistance
Minimises transmission power losses
Maintains the frequency for the consumer
Reduces the off-peak current variation
Allows the transmission lines to be uninsulated
The principal factor which determines the fire hazard in a building such as a nursing home is?
The fire resistance of the building
The class of occupancy
The height of the building
The fire hazard of the contents
The type of building construction
Compared with an electrically driven pump, a diesel pump is intended to provide?
Extra pressure for high buildings
An emergency supply in case of fire engine failure
A secondary supply in case of electric main failure
A more reliable supply to the booster pumps
A more efficient power source
A fire hydrant water storage tank must be large enough to provide?
A 10 minute supply while the fire fighters set up their equipment
A supply for the general public to extinguish the fire
A reserve water supply in case of mains failure
A source of water for the very top floors of a high rise building
Water for fire fighting outside the building
Both hydrants & hose reels may be installed in a building. Which of the following statements is correct?
The hydrants are intended to reduce the initial fire intensity & the hose reels for finally extinguishing the fire.
Both systems are essential to fight a fire far removed from the street main
The hose reels are used only by the public during the initial stages of a fire
Hose reels are for buildings less than 25m & hydrants for buildings greater than 25m high
The hydrants provide protection for 20mins until the fire brigade arrive
A grade 1 water supply for sprinkler system is defined as having?
One independent connection to the street main
Two separate connects to the same main
Two independent sources of water supply
A storage tank a roof level
A diesel powered water supply
The spacing between fire sprinkler heads depends on?
The height & volume of the building
The floor area of the fire compartment
The number of fire compartments
Whether other automatic systems are installed
The fire hazard of the building
The national building code provides for several methods of smoke extract control. Which of the following methods is not acceptable?
Through openable windows
Through a non fire- isolated stair
Through an air conditioning system
Through roof vents
Through a fan/ductwork system
The occupied areas of a building greater than 25m above street level represent a severe fire hazard because?
The convected heat at the top of the floor is so great
The water pressure at the top floor is low
The fire may need to be fought from inside the building
Standard fire hoses may not be sufficiently long
Water storage above 25m is impractical
Hard water contains dissolved salts, specified in terms of their concentration in parts per million. Very hard water has greater than?
20ppm
50ppm
100ppm
300ppm
1000ppm
The principle reason why hot water for central heating is normally generated a few degrees below 100 is?
To prevent the deposition of salts
Because the operating temperature must be below 100 degrees
To prevent overheating the equipment
To prevent excessive pressure in the pipe work
To avoid the expense of water pressurisation
The most effective way of reducing the time for hot water to arrive at the basin after opening the tap, in a large high-rise building, is by?
The installation of proper pipe insulation
Recirculating the water through a ring main
The use of an indirect heating system
Reducing the water resistance of the pipework system
Increasing the size of the pipework
Temporary hardness in water can be simply removed by?
Adding sodium carbonate
Filtration through fine sand
Boiling the water
Evaporation under reduced pressure
Adding chlorine at the source
Installing a domestic cold water tank in a large building? Provides water in the event of mains failure & Tends to reduce the size of the water mains. A third major reason is that it also?
Reduces the size of the hot water storage
Provides extra water for central heating
Provides reserve water for fire fighting
Prevents the backflow of contaminated water from the mains
Optimises the water pressure throughout the building
For a particular building assume that the following hydraulics criteria apply: The water pressure in the adjacent street main is 50m head + The pressure at the basin must not be less than 10m + Friction losses within the building are 12m. For this building, what is the maximum height at which a basin may be installed above street level when connected directly to the main?
36m
72m
48m
28m
52m
{"name":"CT6", "url":"https://www.quiz-maker.com/QPREVIEW","txt":"Test your knowledge on Heating, Ventilation, and Air Conditioning (HVAC) concepts with our comprehensive quiz! This quiz consists of 51 carefully crafted questions that cover various aspects of building climate control, ensuring you have a well-rounded understanding of the subject.Whether you're a student, a professional in the field, or simply interested in learning more, this quiz is perfect for you. Key features include:Multiple choice questionsDetailed explanations of correct answersChallenge your skills and knowledge","img":"https:/images/course2.png"}