Question 41
During winter when the outside temperature drops below -20°C, an air
conditioned space should have a relative humidity of:D
A) 60%
B) 50%
C) 40%
D) 30%
E) 20%
Question 42
During winter when the outside temperature drops - 20°C, a relative humidity
of 50% will:C
A) cause an uncomfortable feeling for most people.
B) result in lower energy consumption.
C) cause excessive static electricity build-up.
D) result in condensation problems.
E) cause problems with electrical equipment.
Question 43
The time for a person's body to adjust when moving between spaces of varying
temperature and humidity is called the:A
A) shock effect
B) thermal variance
C) quench effect
D) temperature/humidity variance
E) thermal load ratio
Question 44
In air conditioned spaces, the comfort chart is not directly applicable
when: E
A) the heating method is warm air.
B) used in the southern part of Canada.
C) the heating method is steam.
D) the heating method is hot water.
E) the heating method is radiant heat.
Question 45
To maintain the effective temperature as constant in a controlled space, if
the dry bulb temperature is raised and the relative humidity stays the same,
the air movement should be: C
A) reduced
B) unchanged
C) increased
D) stopped
Question 46
From the group of people listed, the highest effective temperature would be
required for a: D
A) man under 40 years old.
B) man over 40 years old.
C) woman under 40 years old.
D) woman over 40 years old.
E) woman or a man 40 years old.
Question 47
An increased air flow increases the heat loss of the body due to:C
A) convection, radiation, and evaporation.
B) convection, radiation, and conduction.
C) convection, conduction and evaporation.
D) conduction and evaporation.
E) conduction and radiation.
Question 48
In an air conditioned building, factors that may affect the comfort of
people include: A
1. duration of stay of the occupants.
2. physical activities of the occupants.
3. nationality of the occupants
4. age and gender of the occupants.
5. religion of the occupants.
A) 1, 2 and 4 ONLY
B) 2, 3 and 4 ONLY
C) 3, 4 and 5 ONLY
D) 1, 2, 3 and 4 ONLY
Question 49
The three kinds of pressure that an operating fan produces are: B
A) total pressure, velocity pressure, and partial pressure.
B) total pressure, velocity pressure, and static pressure.
C) suction pressure, discharge pressure and total pressure.
D) static pressure, velocity pressure, and suction pressure.
E) total pressure, velocity pressure and suction pressure.
Question 50
In an air conditioning system, the pressure that overcomes the resistance of
the ducts, filters, etc. is ___________ pressure: C
A) velocity
B) total
C) static
D) dynamic
E) partial
Question 51
In an air conditioning duct, the velocity pressure is the pressure over and
above _________ pressure: A
A) static
B) total
C) atmospheric
D) dynamic
E) suction
Question 52
Static pressure of air flowing in a duct can be measured by connecting a
manometer with its measuring tube inlet: D
A)facing the air flow
B) back against the air flow.
C) arranged at any angle
.D)at a right angle to the wall.
E) facing the airflow at a 45?angle.
Question 53
When a constant volume of air flows from a big duct into a small duct
(converging), the velocity of the air will: B
A) decrease.
B) increase.
C) have no change.
D) be determined based on the duct material used.
E) be determined based on the shape of the duct.
Question 54
They type of fan that consists of a rotor or wheel having several radial
blades mounted on a shaft within the fan housing is generally classified
as: A
A) an axial flow fan.
B) a centrifugal fan.
C) a combination centrifugal/axial flow fan.
D) a ramjet fan.
E) an air eductor.
Question 55
Which of the following is NOT a centrifugal fan: C
A)`Backward inclined fan.
B) Forward curved fan.
C) Propeller fan.
D) Radial blade fan.
Question 56
In a centrifugal fan, the path followed by air: C
A) enters near the centre of the shaft and discharges parallel to the
direction of the shaft.
B) enters from the wheel periphery and exits near the centre of the axis.
C) enters near the centre of the axis flows radially outward and discharges
tangentially to the fan wheel.
D) enters at the centre of the shaft and discharges at the other side of the
shaft.
E) enters from the wheel periphery and exits along the axis.
Question 57
To convert velocity pressure into static pressure, a centrifugal fan housing
is constructed with a _________ shape. A
A) cylindrical
B) triangular
C) rectangular
D) scroll
E) tangential
Question 58
One of the classes of construction that a centrifugal fan is based on is
the: A
A) fan speed in rpm.
B) total pressure developed.
C) horse power consumption.
D) kilowatt rating.
E) static efficiency.
Question 59
A fan that is NOT used for HVAC applications is the: C
A) backward inclined blade fan.
B) forward curved blade fan.
C) backward inclined blade with air foil.
D) radial blade (straight blade) fan.
Question 60
The forward curved centrifugal fan is most suited for moving large volumes
of air:A
A) while operating at low speed.
B) while operating at high speed.
C) with low power consumption.
D) using a variable speed drive.
Question 61
Among the type of centrifugal fans, the most energy efficient one is the :
A) radial blade fan. B
B) backward inclined blade fan.
C) forward curved blade fan.
D) backward inclined fan with air foil.
E) propeller fan.
Question 62
Select the statement about a propeller fan that is FALSE.D
A) It can produce high static pressure.
B) It has the ability to move large volumes of air.
C) Power requirement is lowest at maximum air delivery.
D) It is widely used in air-cooled condensers.
E) It is economical for producing large air movements at low pressures.
Question 63
The fan which discharges maximum air delivery at the lowest power
requirement and is used mainly to produce larger air movements at low
pressure is:A
A) the propeller fan.
B) the tube axial fan.
C) the backward inclined blade fan.
D) the forward curved blade fan.
E) the backward inclined fan with air foil.
Question 64
Select the statement about a tube axial fan that is FALSE. D
A) Friction losses are higher than centrifugal fans.
B) It has the ability to move large volume of air.
C) It is suitable for use in industrial air conditioning.
D) It is quite noisy in operation.E) It is widely used in commercial air
conditioning.
Question 65
Properties of the tube axial fan include: A
1. It is suitable for duct mounting.
2. It discharges the air in a spiral motion.
3. It is quite noisy in operation.
4. It has widespread application in commercial air conditioning.
A) 1, 2, and 3 ONLY
B) 2, 3, and 4 ONLY
C) 2 and 4 ONLY
D) 1, 3 and 4 ONLY
E) 1 and 4 ONLY
Question 66
When comparing the tube axial fan with the vane axial fan the main
difference between the two is the: A
A) noise output
B) location of the fan motor
C) difference in size
D) motion of the discharge air
E) method used to drive the fan
Question 67
Vane axial fans are often used when: C
A) space considerations are important.
B) ease of access to the motor is important.
C) quietness of operation is important.
D) there is no duct system for air delivery.
E) only a small volume of air is required.
Question 68
Which of the following statements about fan performance curves is FALSE?A
A) They are developed from theoretical calculations.
B) The curve is a plot of static pressure against air volume delivery.
C) The curve is a plot of horse power against air volume delivery.
D) The curve is a plot of static efficiency against air volume delivery.
E) The curve range is from shut off to free delivery.
Question 69
When a fan outlet is fully open:B
A) air volume delivery is at a minimum.
B) free air volume deliver exists.
C) power requirements are at a minimum.
D) fan static efficiency is at a maximum.
E) fan static pressure is at a maximum.
Question 70
A non-overloading fan characteristic means that the power curve on the
performance diagram:E
A) maintains almost a horizontal line.
B) continuously rises from shut off to free delivery.
C) rises from shut off to a maximum and then falls off when approaching free
delivery.
D) continuously rises or falls depending upon the air temperature.
E) is maximum at shut off and then falls when approaching free delivery.
Question 71
To account for drive losses and reduction in line voltage, the normal
allowable overload factor for a fan is:B
A) 10%
B) 15%
C) 20%
D) 25%
E) 30%
Question 72
When the air distribution system resistance can be determined accurately, a
small fan with _________is often selected:B
A) chain drive.
B) direct drive.
C) V-belt drive.
D) hydraulic drive.
E) gear drive.
Question 73
To minimize vibration problems and premature wearing of a fan's V-belts, use
matched belt sets and:D
A)a properly-designed cooling system.
B) a belt guard.
C) a fluid drive
D) good quality balanced sheaves.
E) a variable speed motor.
Question 74
The drive that relieves the driven fan of shock loading during start-up is
the: A
A) fluid drive
B) V-belt drive
C) variable inlet vane control
D) variable speed motor control
E) outlet damper control
Question 75
The least effective and least expensive method to control air volume moved
by fans is to use: A
A) outlet damper control.
B) variable inlet vane control.
C) fluid drive control.
D) variable speed motor control.
Question 76
Control of a fan's static pressure and horsepower requirements at a given
speed is obtained using:D
A) direct drive.
B) gear drive.
C) outlet damper control.
D) variable inlet vane control.
E) V-belt drive.
Question 77
In designing ductwork, factors to consider include:E?
1. size of the duct versus the frictional losses.
2. size of the duct and the velocity of air in the duct, versus the intended
delivery volume of air.
3. fan power requirement versus the cost of the duct.
4. first cost of the duct versus operating cost.
A) 1, 2 and 3 ONLY
B) 2 and 4 ONLY
C) 3 and 4 ONLY
D) 1, 2, and 4 ONLY
E) 1, 2, 3, and 4
Question 78
The main advantage of a high pressure duct over a low pressure system is:B
A) lower operation cost, i.e. less fan power is required.
B) the relative quietness of air movement.
C) lower initial cost of the air handling apparatus.
D) smaller space requirements.
E) no special control devices are required.
Question 79
The most commonly-used duct material for ventilating air and air
conditioning systems is:A
A) galvanized steel
B) black steel
C) copper
D) fibre glass
E) cement
Question 80
The most suitable material for a kitchen exhaust duct is:
A) rubber-lined aluminium:C
B) aluminium sheet metal
C) black steel sheet metal
D) fibreglass
E) cement asbestos
During winter when the outside temperature drops below -20°C, an air
conditioned space should have a relative humidity of:D
A) 60%
B) 50%
C) 40%
D) 30%
E) 20%
Question 42
During winter when the outside temperature drops - 20°C, a relative humidity
of 50% will:C
A) cause an uncomfortable feeling for most people.
B) result in lower energy consumption.
C) cause excessive static electricity build-up.
D) result in condensation problems.
E) cause problems with electrical equipment.
Question 43
The time for a person's body to adjust when moving between spaces of varying
temperature and humidity is called the:A
A) shock effect
B) thermal variance
C) quench effect
D) temperature/humidity variance
E) thermal load ratio
Question 44
In air conditioned spaces, the comfort chart is not directly applicable
when: E
A) the heating method is warm air.
B) used in the southern part of Canada.
C) the heating method is steam.
D) the heating method is hot water.
E) the heating method is radiant heat.
Question 45
To maintain the effective temperature as constant in a controlled space, if
the dry bulb temperature is raised and the relative humidity stays the same,
the air movement should be: C
A) reduced
B) unchanged
C) increased
D) stopped
Question 46
From the group of people listed, the highest effective temperature would be
required for a: D
A) man under 40 years old.
B) man over 40 years old.
C) woman under 40 years old.
D) woman over 40 years old.
E) woman or a man 40 years old.
Question 47
An increased air flow increases the heat loss of the body due to:C
A) convection, radiation, and evaporation.
B) convection, radiation, and conduction.
C) convection, conduction and evaporation.
D) conduction and evaporation.
E) conduction and radiation.
Question 48
In an air conditioned building, factors that may affect the comfort of
people include: A
1. duration of stay of the occupants.
2. physical activities of the occupants.
3. nationality of the occupants
4. age and gender of the occupants.
5. religion of the occupants.
A) 1, 2 and 4 ONLY
B) 2, 3 and 4 ONLY
C) 3, 4 and 5 ONLY
D) 1, 2, 3 and 4 ONLY
Question 49
The three kinds of pressure that an operating fan produces are: B
A) total pressure, velocity pressure, and partial pressure.
B) total pressure, velocity pressure, and static pressure.
C) suction pressure, discharge pressure and total pressure.
D) static pressure, velocity pressure, and suction pressure.
E) total pressure, velocity pressure and suction pressure.
Question 50
In an air conditioning system, the pressure that overcomes the resistance of
the ducts, filters, etc. is ___________ pressure: C
A) velocity
B) total
C) static
D) dynamic
E) partial
Question 51
In an air conditioning duct, the velocity pressure is the pressure over and
above _________ pressure: A
A) static
B) total
C) atmospheric
D) dynamic
E) suction
Question 52
Static pressure of air flowing in a duct can be measured by connecting a
manometer with its measuring tube inlet: D
A)facing the air flow
B) back against the air flow.
C) arranged at any angle
.D)at a right angle to the wall.
E) facing the airflow at a 45?angle.
Question 53
When a constant volume of air flows from a big duct into a small duct
(converging), the velocity of the air will: B
A) decrease.
B) increase.
C) have no change.
D) be determined based on the duct material used.
E) be determined based on the shape of the duct.
Question 54
They type of fan that consists of a rotor or wheel having several radial
blades mounted on a shaft within the fan housing is generally classified
as: A
A) an axial flow fan.
B) a centrifugal fan.
C) a combination centrifugal/axial flow fan.
D) a ramjet fan.
E) an air eductor.
Question 55
Which of the following is NOT a centrifugal fan: C
A)`Backward inclined fan.
B) Forward curved fan.
C) Propeller fan.
D) Radial blade fan.
Question 56
In a centrifugal fan, the path followed by air: C
A) enters near the centre of the shaft and discharges parallel to the
direction of the shaft.
B) enters from the wheel periphery and exits near the centre of the axis.
C) enters near the centre of the axis flows radially outward and discharges
tangentially to the fan wheel.
D) enters at the centre of the shaft and discharges at the other side of the
shaft.
E) enters from the wheel periphery and exits along the axis.
Question 57
To convert velocity pressure into static pressure, a centrifugal fan housing
is constructed with a _________ shape. A
A) cylindrical
B) triangular
C) rectangular
D) scroll
E) tangential
Question 58
One of the classes of construction that a centrifugal fan is based on is
the: A
A) fan speed in rpm.
B) total pressure developed.
C) horse power consumption.
D) kilowatt rating.
E) static efficiency.
Question 59
A fan that is NOT used for HVAC applications is the: C
A) backward inclined blade fan.
B) forward curved blade fan.
C) backward inclined blade with air foil.
D) radial blade (straight blade) fan.
Question 60
The forward curved centrifugal fan is most suited for moving large volumes
of air:A
A) while operating at low speed.
B) while operating at high speed.
C) with low power consumption.
D) using a variable speed drive.
E) with a high efficiency.
Among the type of centrifugal fans, the most energy efficient one is the :
A) radial blade fan. B
B) backward inclined blade fan.
C) forward curved blade fan.
D) backward inclined fan with air foil.
E) propeller fan.
Question 62
Select the statement about a propeller fan that is FALSE.D
A) It can produce high static pressure.
B) It has the ability to move large volumes of air.
C) Power requirement is lowest at maximum air delivery.
D) It is widely used in air-cooled condensers.
E) It is economical for producing large air movements at low pressures.
Question 63
The fan which discharges maximum air delivery at the lowest power
requirement and is used mainly to produce larger air movements at low
pressure is:A
A) the propeller fan.
B) the tube axial fan.
C) the backward inclined blade fan.
D) the forward curved blade fan.
E) the backward inclined fan with air foil.
Question 64
Select the statement about a tube axial fan that is FALSE. D
A) Friction losses are higher than centrifugal fans.
B) It has the ability to move large volume of air.
C) It is suitable for use in industrial air conditioning.
D) It is quite noisy in operation.E) It is widely used in commercial air
conditioning.
Question 65
Properties of the tube axial fan include: A
1. It is suitable for duct mounting.
2. It discharges the air in a spiral motion.
3. It is quite noisy in operation.
4. It has widespread application in commercial air conditioning.
A) 1, 2, and 3 ONLY
B) 2, 3, and 4 ONLY
C) 2 and 4 ONLY
D) 1, 3 and 4 ONLY
E) 1 and 4 ONLY
Question 66
When comparing the tube axial fan with the vane axial fan the main
difference between the two is the: A
A) noise output
B) location of the fan motor
C) difference in size
D) motion of the discharge air
E) method used to drive the fan
Question 67
Vane axial fans are often used when: C
A) space considerations are important.
B) ease of access to the motor is important.
C) quietness of operation is important.
D) there is no duct system for air delivery.
E) only a small volume of air is required.
Question 68
Which of the following statements about fan performance curves is FALSE?A
A) They are developed from theoretical calculations.
B) The curve is a plot of static pressure against air volume delivery.
C) The curve is a plot of horse power against air volume delivery.
D) The curve is a plot of static efficiency against air volume delivery.
E) The curve range is from shut off to free delivery.
Question 69
When a fan outlet is fully open:B
A) air volume delivery is at a minimum.
B) free air volume deliver exists.
C) power requirements are at a minimum.
D) fan static efficiency is at a maximum.
E) fan static pressure is at a maximum.
Question 70
A non-overloading fan characteristic means that the power curve on the
performance diagram:E
A) maintains almost a horizontal line.
B) continuously rises from shut off to free delivery.
C) rises from shut off to a maximum and then falls off when approaching free
delivery.
D) continuously rises or falls depending upon the air temperature.
E) is maximum at shut off and then falls when approaching free delivery.
Question 71
To account for drive losses and reduction in line voltage, the normal
allowable overload factor for a fan is:B
A) 10%
B) 15%
C) 20%
D) 25%
E) 30%
Question 72
When the air distribution system resistance can be determined accurately, a
small fan with _________is often selected:B
A) chain drive.
B) direct drive.
C) V-belt drive.
D) hydraulic drive.
E) gear drive.
Question 73
To minimize vibration problems and premature wearing of a fan's V-belts, use
matched belt sets and:D
A)a properly-designed cooling system.
B) a belt guard.
C) a fluid drive
D) good quality balanced sheaves.
E) a variable speed motor.
Question 74
The drive that relieves the driven fan of shock loading during start-up is
the: A
A) fluid drive
B) V-belt drive
C) variable inlet vane control
D) variable speed motor control
E) outlet damper control
Question 75
The least effective and least expensive method to control air volume moved
by fans is to use: A
A) outlet damper control.
B) variable inlet vane control.
C) fluid drive control.
D) variable speed motor control.
Question 76
Control of a fan's static pressure and horsepower requirements at a given
speed is obtained using:D
A) direct drive.
B) gear drive.
C) outlet damper control.
D) variable inlet vane control.
E) V-belt drive.
Question 77
In designing ductwork, factors to consider include:E?
1. size of the duct versus the frictional losses.
2. size of the duct and the velocity of air in the duct, versus the intended
delivery volume of air.
3. fan power requirement versus the cost of the duct.
4. first cost of the duct versus operating cost.
A) 1, 2 and 3 ONLY
B) 2 and 4 ONLY
C) 3 and 4 ONLY
D) 1, 2, and 4 ONLY
E) 1, 2, 3, and 4
Question 78
The main advantage of a high pressure duct over a low pressure system is:B
A) lower operation cost, i.e. less fan power is required.
B) the relative quietness of air movement.
C) lower initial cost of the air handling apparatus.
D) smaller space requirements.
E) no special control devices are required.
Question 79
The most commonly-used duct material for ventilating air and air
conditioning systems is:A
A) galvanized steel
B) black steel
C) copper
D) fibre glass
E) cement
Question 80
The most suitable material for a kitchen exhaust duct is:
A) rubber-lined aluminium:C
B) aluminium sheet metal
C) black steel sheet metal
D) fibreglass
E) cement asbestos
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