CH.103
Automatic snow melting systems can use:
A )
hot water and antifreeze mixed
B )
electric resistance heating
C )
infrared lamps mounted above sidewalks and ramps
D )
hot water and ethylene glycol mixed
E ) all of the above
In a one pipe hot water system the fitting
that directs the water to each converter is called the:
A ) diverter
B )
trap
C )
vent valve
D )
separator
E )
lead
In a hot water system compared to a steam
heating system, if there is a leak damage will:
A )
be greater in the steam system
B ) be greater in the hot
water system
C )
be about the same in either system
D )
depend on where the boiler is located in the system
E )
be minimal due to the automatic drain system
A hot water boiler of the same output
is:
A )
larger than a steam boiler
B ) smaller than a steam
boiler
C )
the same size as a steam boiler
D )
taller than a steam boiler
E )
shorter than a steam boiler
The maximum temperature of water in a
gravity hot water system is:
A )
65 °C
B ) 70
°C
C ) 77 °C
D )
87 °C
E )
67 °C
In radiant heating system changes are:
A ) difficult to make
B )
easy to make
C )
as easy to make as in any other heating system
D )
dependent on availability of materials
E )
dependent on location
Snow melting systems are usually filled
with:
A )
water only
B )
methanol and water
C ) ethylene glycol and water
D )
steam
E )
warm air
Which of the following use a boiler in the
system?1. steam heating 2. electric heating 3. steam to hot water system4. hot
water heating
A )
1, 2
B )
2, 3
C )
1, 4
D )
3, 4
E ) 1, 3, 4
A hot water system which circulates water
through the pipes with a pump is known as a:
A )
circulating system
B ) forced system
C )
pumped system
D )
gravity system
E ) return
system
A forced hot water circulating system can
be classified as the following type:
A )
loop system
B )
one pipe system
C )
two pipe direct return system
D )
two pipe reverse return system
E ) all of the above
CH.104
The purpose of an expansion tank is to:
A )
store heat while the boiler is firing
B ) allow for the expansion of
water in the system
C )
prevent the system from overflowing
D )
to prevent the water in the system from freezing
E )
to prevent water lock in the system
The purpose of a pressure reducing valve is
to:
A )
level out the flow of steam or hot water
B ) automatically reduce
pressure and maintain it
C )
reduce water hammer in a heating system
D )
maintain hot water at a required pressure
E )
to reduce the feedwater pressure to the boiler
An air separator should always be installed
in:
A ) a horizontal pipe
B )
a cross tee
C )
a vertical pipe
D )
an expansion tank
E )
a converter
Improper location of the circulating pump
and expansion tank can cause:
A )
the circulating pump to cavitate
B )
some points in the system to be under negative pressure
C )
air to be drawn into the system
D )
vapour bubbles to form in the circulating pump
E ) all of the above
To regulate the flow of water to a zone
circuit a:
A )
flow control valve is used
B )
diverter fitting is used
C )
gate valve is used
D )
pressure reducing valve is used
E ) balancing valve is used
The temperature control on a steam to hot
water converter, controls:
A )
the pump speed
B )
the steam temperature
C )
the water flow
D ) the steam control valve
E )
the firing rate
Excessive pressure build-up due to a rise
in temperature and the resulting expansion of the water in the system is prevented
by the use of:
A )
a float tank
B )
a relief valve
C ) an expansion tank
D )
a cushion valve
E )
a safety valve
Valves in heating systems should be
_______________ if they do not shut off tightly.
A )
discarded
B )
heated
C )
bypassed
D ) repaired
E )
reported
Air is removed from a hot water system by
which of the following:1. air vents2. deaerators3. air condensers4. air
separators
A )
1, 2
B )
2, 3
C ) 1, 4
D )
2, 4
E )
1, 3
Diverter fittings are used in the supply
lines to heating units:
A )
to compensate for a low heating load
B ) when a higher heating
output is required from the heating unit
C )
when the distance from the boiler to heating unit is short
D )
when there are no balancing valves installed in the supply line
E )
when a hydraulic balance must be corrected
CH.105
The advantage of having duct furnaces
instead of a large central furnace is:
A )
less initial cost
B )
easier installation
C ) better control of heat in
each zone of the building
D )
that they require less space
E )
lower maintenance costs
Lowboy furnaces are just over:
A )
1.0 m in height
B )
0.8 m in height
C )
1.4 m in height
D )
1.6 m in height
E ) 1.2 m in height
In a fin-coil heat exchanger the primary
source of heat for the exchanger is:
A ) steam or hot water
B )
gas
C )
oil
D )
solar
E )
radiant
In a warm air heating system the cold air
return registers are located:
A )
in exterior walls
B ) in interior locations
C )
under windows
D )
in floors
E )
in ceilings
The power supply for an electric resistance
coil furnace is:
A )
60 V
B )
120 V
C ) 240 V
D )
220 V
E )
480 V
High efficiency furnaces and heaters range
in annual fuel utilisation efficiency (AFUE) from:
A )
94 - 98%
B ) 80 - 95%
C )
70 - 75%
D )
60 - 70%
E )
50 - 60%
The major disadvantage of an electric
resistance coil furnace for warm air heating is:
A ) the high cost of
electricity
B )
the danger from electric shock
C )
the high cost of maintenance
D )
the large size of the furnace
E )
the location of electrical wiring
In a pulse combination furnace the stated
efficiency is:
A ) 94 - 98%
B )
80 - 95%
C )
70 - 75%
D )
60 - 70%
E )
50 - 60%
A )
flue gas will condense
B ) water vapour will condense
C )
furnace burner will shut down
D )
furnace burner will start up
E )
furnace vent will close
A type of directly fired space heater is:
A )
a unit heater
B )
a floor furnace
C )
a wall furnace
D ) all of the above
E )
none of the above
CH.106
Electronic filters will remove:
A )
all particles from the air
B ) fine particles from the
air
C )
odour producing gases from the air
D )
smoke from the air
E )
all of the above
Furnace heat exchangers should be checked
for corrosion because:
A ) carbon monoxide could leak
into the building
B )
the holes reduce the furnace efficiency
C )
cold air could leak into the building
D )
too much air would enter the furnace
E )
the air will become too dry for comfortable heating
Plugged __________ on warm air heating and
ventilating systems, limit the air flow and result in insufficient heating and
a waste of fuel.
A ) filters
B )
drain lines
C )
diverters
D )
univents
E )
convectors
Heat exchangers in gas fired furnaces are
made of:
A )
brass
B )
copper
C )
aluminium
D ) steel
E )
cast iron
Which of the following is a type of outlet
in a warm air heating system?
A )
a grill
B )
a register
C )
a ceiling diffuser
D )
a perforated panel
E ) all of the above
In a warm air heating system, the heated
air should enter the rooms preferably via the:
A )
high wall registers on the inside wall
B )
baseboard registers on the inside wall
C ) baseboard registers on the
outside wall
D )
high wall registers on the outside wall
E )
unit heaters on the outside wall
Supply outlets should always be located:
A )
in walls
B )
in floors
C )
in ceilings
D ) to best prevent cold
drafts
E )
in baseboards
Air filters can be divided into two groups:
A )
mechanical and rotating drum
B )
electronic and steam
C )
dry and wet
D )
steam and rotating drum
E ) mechanical and electronic
The perimeter loop system of furnace
ducting is ideal for a building with:
A )
no insulation in the walls
B )
concrete walls
C ) no basement
D )
low head room in the basement
E )
no cold air returns
Electronic filters will remove:
A )
all particles from the air
B ) fine particles from the
air
C )
odour producing gases from the air
D )
smoke from the air
E )
all of the above
CH.107
Natural ventilation is improved by the use
of a roof:
A ) ventilator
B )
radiator
C )
grille
D )
louver
E )
panel
Mechanical ventilation can be divided into
which types?
A )
natural air intake, natural exhaust
B ) mechanical air intake,
natural exhaust
C )
natural air intake, mechanical exhaust
D )
natural intake, natural exhaust
E )
none of the above
Living organisms that must be removed from
the air are:
A )
insects and pollen
B )
bacteria and insects
C ) bacteria and spores
D )
pollen and spores
E )
pollen and bacteria
In a mechanical air intake, natural exhaust
ventilation system the pressure in the building is:
A )
well below atmospheric pressure
B )
slightly below atmospheric pressure
C )
at atmospheric pressure
D ) slightly above atmospheric
pressure
E )
well above atmospheric pressure
Actual ventilation rates may vary per
person from:
A )
0.5 to 0.6 m3/min
B )
0.5 to 0.75 m3/min
C )
0.2 to 1.2 m3/min
D ) 0.14 to 1.5 m3/min
E )
1.0 to 1.5 m3/min
Ventilation can be divided into two basic
methods:
A )
forced and natural
B ) mechanical and natural
C )
forced and mechanical
D )
natural and warmed air
E )
natural and cold air
CH.108
Infrared radiant energy is directed
towards:
A )
ceilings
B )
walls
C )
windows
D ) floors
E )
doors
In an internally fired, gas fired infrared
heater, the surface temperature is about:
A )
300 °C
B ) 400 °C
C )
500 °C
D )
600 °C
E )
700 °C
The quartz lamp heating element will
respond:
A )
instantaneously
B ) in a few seconds
C )
in about one minute
D )
in about thirty seconds
E )
in about three minutes
Gas-fired infrared heaters use the
principle of:
A )
heating a gas
B ) heating a solid surface
C )
heating a liquid
D )
heating a porous material
E )
all of the above
Infrared heaters are usually mounted:
A ) overhead
B )
on walls
C )
in floors
D )
under windows
E )
over doors
A low temperature catalytic heater contains
a layer of:
A )
metal impregnated with a catalyst
B )
wool fibre impregnated with a catalyst
C )
plastic fibre impregnated with a catalyst
D ) glass wool impregnated
with a catalyst
E )
porous glass impregnated with a catalyst
No comments:
Post a Comment