Question 141
Heating coil steam trap recommendations include:C
1. Trap all of the coils from a common header.
2. Type of trap depends on pressure differential and capacity.
3. Pitch condensate piping from trap to heater 21 mm/m.
4. Always install a strainer near the trap inlet.
A) 3 and 4 ONLY
B) 1, 2, and 3 ONLY
C) 2, 3, and 4 ONLY
D) 1, 3, and 4 ONLY
E) 1, 2, 3, and 4
Question 142
When using a modulating control valve with an air conditioning steam coil,
ensure that:C
1. the entering air temperature is no lower than -20°C.
2. the valve is correctly sized for the steam load.
3. the valve is of a V-port design for gradual modulation.
4. ensure the control valve is sufficiently oversized.
5. coil and condensate is not lifted to an overhead return.
A) 1, 2, 3 and 4 ONLY
B) 1 and 4 ONLY
C) 2, 3 and 5 ONLY
D) 1, 3, and 5 ONLY
Question 143
Excessively LOW humidity causes:C
1. dry throat and nose membranes.
2. reduced evaporation of moisture on the skin.
3. static electricity build-up.
4. wood furniture and floors to squeak.
5. an excessively warm feeling at normal room temperatures.
A) 2, 3, and 4 ONLY
B) 2, 3, and 5 ONLY
C) 1, 3, and 4 ONLY
D) 1, 2, 3, 4, and 5
Question 144
When air temperature is raised without the addition of water vapour to the
air, the relative humidity will:A
A) decrease
B) not change
C) increase
D) increase or decrease depending on air movement
Question 145
Outside air is - 25°C and is saturated (at -25°C holds a maximum of 0.0005
kg of water vapour/kg of dry air) This air is drawn into a building and is
heated to 22°C (air at 22°C holds a maximum of 0.015 kg of water vapour/kg
of dry air)
What is the relative humidity of the air inside the building?B
A) 0.5%
B) 3.3%
C) 4.5%
D) 10.6%
E) 33%
Question 146
From the health stand-point, the recommended relative humidity for people in
a well-designed building is between:C
A) 65% - 80%
B) 30% - 70%
C) 35% - 50%
D) 20% - 50%
E) 20% - 35%
Question 147
A residential humidifier commonly installed in the supply plenum of a
smaller war air furnace and consisting of a shallow tray partially filled
with water is a:A
A) pan type of humidifier with plates.
B) bypass type humidifier.
C) power type wetted element humidifiers.
D) regenerative type of humidifier.
E) air washer.
Question 148
The humidification capacity rate of a wetted element type humidifier depends
on:A
1. temperature of the passing air.
2. velocity of the passing air.
3. humidity of the passing air.
4. temperature of the water supplied to the tray.
A) 1, 2, and 3 ONLY
B) 2, 3 and 4 ONLY
C) 1, 3 and 4 ONLY
D) 1, 2 and 4 ONLY
E) 1, 2, 3 and 4
Question 149
When the outdoor temperature falls to below -25°C, the recommended relative
humidity inside a home should be maintained at:D
A) less than 10%
B) greater than 30%
C) greater than 50%
D) a slightly lesser value from where condensation starts to appear on
window glass.
E) at a much greater value from where condensation starts of appear on
window glass.
Question 150
Humidifying units that draw warmer air from the furnace return air plenum,
pass it through a wetted pad and return it to the supply air plenum, are
called: C
A) pan type humidifiers with plates.
B) bypass type humidifiers.
C) power type wetted element humidifiers.
D) regenerative type humidifiers.
E) atomizing type humidifiers.
Question 151
Humidifying units that employ a small fan to draw warmer air from the
furnace return air plenum or from the room, and force the air through a
wetted pad and return the air to the room are called: B
A) pan type humidifiers with plates.
B) bypass type humidifiers.
C) power type wetted element humidifiers.
D) regenerative type humidifiers.
E) atomizing type humidifiers.
Question 152
An atomizing humidifier is typically regulated by: C
A) a timer that controls the spray pump.
B) a humidistat that controls a solenoid valve on the supply water line.
C) a humidistat that controls the spray pump.
D) a timer that controls a solenoid valve on the supply water line.
E) a humidistat that controls the supply fan.
Question 153
The humidifier that causes a fine white dust to settle in ducts and rooms is
the:B
A) power type wetted element humidifier.
B) atomizing humidifier.
C) pan type humidifier.
D) bypass type wetted element humidifier.
E) pan type humidifier with plates.
Question 154
Advantages to using air washers in air conditions systems include their
ability to: E
1. remove tobacco smoke.
2. clean the air.
3. cool the air.
4. dehumidify the air.
5. humidify the air.
A) 1, 2, 3 and 4 ONLY
B) 2, 3 and 5 ONLY
C) 3 and 5 ONLY
D) 1, 2, 3 and 5 ONLY
E) 2, 3, 4 and 5 ONLY
Question 155
Industrial air washers should be installed at the: A
A) suction side of the supply air fan.
B) discharge side of the supply air fan.
C) suction side of the return fan.
D) discharge side of the return fan.
E) location where it can be most easily serviced.
Question 156
Dehumidification occurs in an air washer when: C
A) the spray water temperature is above the dry bulb temperature of the
passing air.
B) the spray water temperature is above the dew point of the passing air.
C) the spay water temperature is below the dew point of the passing air.
D) the level of the spray water in the sump is dropped to below the set
point.
E) the spray water temperature is below the dry bulb temperature of the
passing air.
Question 157
Identify the spray water temperature control method that is NOT used on an
air washer.D
A) Mixing part of the spray water with make up hot or cold water.
B) Recirculating the spray water through a heat exchanger which can be
either heated or cooled.
C) Heating or cooling the spray water by an immersed heating or cooling coil
in the spray water sump.
D) Varying the spray water header pressure to change the boiling temperature
of the spray water.
Question 158
A steam grid humidifier is typically regulated by a: C
A) timer that opens and closes a steam control valve.
B) humidistat that controls an on-off solenoid valve on the steam line.
C) humidistat that modulates a steam control valve.
D) timer that controls a solenoid valve on the steam boiler supply water
line.
E) humidistat that controls the supply fan.
Question 159
To protect the electric element in a pan type of humidifier, the system
should be equipped with a:C
A) circuit breaker.
B) ground fault interrupter.
C) low water level electric power cut off.
D) high water temperature electric power cut off.
E) high water level electric power cut off.
Question 160
A key function of a comfort air conditioning system is to maintain the space
condition by controlling the: A
A) temperature of the circulated air.
B) temperature of the steam.
C) temperature of the hot water.
D) temperature of the refrigerant.
E) pressure of the refrigerant.
Question 161
To offset the heat gains through a building's exterior shell and from
internal heat sources, an air conditioning system must employ: C
A) a humidifier.
B) a dehumidifier.
C) a cooling source.
D) air recirculation.
E) air filtration.
Heating coil steam trap recommendations include:C
1. Trap all of the coils from a common header.
2. Type of trap depends on pressure differential and capacity.
3. Pitch condensate piping from trap to heater 21 mm/m.
4. Always install a strainer near the trap inlet.
A) 3 and 4 ONLY
B) 1, 2, and 3 ONLY
C) 2, 3, and 4 ONLY
D) 1, 3, and 4 ONLY
E) 1, 2, 3, and 4
Question 142
When using a modulating control valve with an air conditioning steam coil,
ensure that:C
1. the entering air temperature is no lower than -20°C.
2. the valve is correctly sized for the steam load.
3. the valve is of a V-port design for gradual modulation.
4. ensure the control valve is sufficiently oversized.
5. coil and condensate is not lifted to an overhead return.
A) 1, 2, 3 and 4 ONLY
B) 1 and 4 ONLY
C) 2, 3 and 5 ONLY
D) 1, 3, and 5 ONLY
Question 143
Excessively LOW humidity causes:C
1. dry throat and nose membranes.
2. reduced evaporation of moisture on the skin.
3. static electricity build-up.
4. wood furniture and floors to squeak.
5. an excessively warm feeling at normal room temperatures.
A) 2, 3, and 4 ONLY
B) 2, 3, and 5 ONLY
C) 1, 3, and 4 ONLY
D) 1, 2, 3, 4, and 5
Question 144
When air temperature is raised without the addition of water vapour to the
air, the relative humidity will:A
A) decrease
B) not change
C) increase
D) increase or decrease depending on air movement
Question 145
Outside air is - 25°C and is saturated (at -25°C holds a maximum of 0.0005
kg of water vapour/kg of dry air) This air is drawn into a building and is
heated to 22°C (air at 22°C holds a maximum of 0.015 kg of water vapour/kg
of dry air)
What is the relative humidity of the air inside the building?B
A) 0.5%
B) 3.3%
C) 4.5%
D) 10.6%
E) 33%
Question 146
From the health stand-point, the recommended relative humidity for people in
a well-designed building is between:C
A) 65% - 80%
B) 30% - 70%
C) 35% - 50%
D) 20% - 50%
E) 20% - 35%
Question 147
A residential humidifier commonly installed in the supply plenum of a
smaller war air furnace and consisting of a shallow tray partially filled
with water is a:A
A) pan type of humidifier with plates.
B) bypass type humidifier.
C) power type wetted element humidifiers.
D) regenerative type of humidifier.
E) air washer.
Question 148
The humidification capacity rate of a wetted element type humidifier depends
on:A
1. temperature of the passing air.
2. velocity of the passing air.
3. humidity of the passing air.
4. temperature of the water supplied to the tray.
A) 1, 2, and 3 ONLY
B) 2, 3 and 4 ONLY
C) 1, 3 and 4 ONLY
D) 1, 2 and 4 ONLY
E) 1, 2, 3 and 4
Question 149
When the outdoor temperature falls to below -25°C, the recommended relative
humidity inside a home should be maintained at:D
A) less than 10%
B) greater than 30%
C) greater than 50%
D) a slightly lesser value from where condensation starts to appear on
window glass.
E) at a much greater value from where condensation starts of appear on
window glass.
Question 150
Humidifying units that draw warmer air from the furnace return air plenum,
pass it through a wetted pad and return it to the supply air plenum, are
called: C
A) pan type humidifiers with plates.
B) bypass type humidifiers.
C) power type wetted element humidifiers.
D) regenerative type humidifiers.
E) atomizing type humidifiers.
Question 151
Humidifying units that employ a small fan to draw warmer air from the
furnace return air plenum or from the room, and force the air through a
wetted pad and return the air to the room are called: B
A) pan type humidifiers with plates.
B) bypass type humidifiers.
C) power type wetted element humidifiers.
D) regenerative type humidifiers.
E) atomizing type humidifiers.
Question 152
An atomizing humidifier is typically regulated by: C
A) a timer that controls the spray pump.
B) a humidistat that controls a solenoid valve on the supply water line.
C) a humidistat that controls the spray pump.
D) a timer that controls a solenoid valve on the supply water line.
E) a humidistat that controls the supply fan.
Question 153
The humidifier that causes a fine white dust to settle in ducts and rooms is
the:B
A) power type wetted element humidifier.
B) atomizing humidifier.
C) pan type humidifier.
D) bypass type wetted element humidifier.
E) pan type humidifier with plates.
Question 154
Advantages to using air washers in air conditions systems include their
ability to: E
1. remove tobacco smoke.
2. clean the air.
3. cool the air.
4. dehumidify the air.
5. humidify the air.
A) 1, 2, 3 and 4 ONLY
B) 2, 3 and 5 ONLY
C) 3 and 5 ONLY
D) 1, 2, 3 and 5 ONLY
E) 2, 3, 4 and 5 ONLY
Question 155
Industrial air washers should be installed at the: A
A) suction side of the supply air fan.
B) discharge side of the supply air fan.
C) suction side of the return fan.
D) discharge side of the return fan.
E) location where it can be most easily serviced.
Question 156
Dehumidification occurs in an air washer when: C
A) the spray water temperature is above the dry bulb temperature of the
passing air.
B) the spray water temperature is above the dew point of the passing air.
C) the spay water temperature is below the dew point of the passing air.
D) the level of the spray water in the sump is dropped to below the set
point.
E) the spray water temperature is below the dry bulb temperature of the
passing air.
Question 157
Identify the spray water temperature control method that is NOT used on an
air washer.D
A) Mixing part of the spray water with make up hot or cold water.
B) Recirculating the spray water through a heat exchanger which can be
either heated or cooled.
C) Heating or cooling the spray water by an immersed heating or cooling coil
in the spray water sump.
D) Varying the spray water header pressure to change the boiling temperature
of the spray water.
Question 158
A steam grid humidifier is typically regulated by a: C
A) timer that opens and closes a steam control valve.
B) humidistat that controls an on-off solenoid valve on the steam line.
C) humidistat that modulates a steam control valve.
D) timer that controls a solenoid valve on the steam boiler supply water
line.
E) humidistat that controls the supply fan.
Question 159
To protect the electric element in a pan type of humidifier, the system
should be equipped with a:C
A) circuit breaker.
B) ground fault interrupter.
C) low water level electric power cut off.
D) high water temperature electric power cut off.
E) high water level electric power cut off.
Question 160
A key function of a comfort air conditioning system is to maintain the space
condition by controlling the: A
A) temperature of the circulated air.
B) temperature of the steam.
C) temperature of the hot water.
D) temperature of the refrigerant.
E) pressure of the refrigerant.
Question 161
To offset the heat gains through a building's exterior shell and from
internal heat sources, an air conditioning system must employ: C
A) a humidifier.
B) a dehumidifier.
C) a cooling source.
D) air recirculation.
E) air filtration.
No comments:
Post a Comment