Appliances Flashcards
conduction is:
a) the transfer of heat by the movement of fluids
b) the opposite of evaporation
c) the transfer of heat from particle to particle
d) the transfer of heat by electromagnetic waves
c) the transfer of heat from particle to particle
convection is :
a) the transfer of heat by the movement of fluids
b) when water holes on electrical charge
c) the transfer of heat by electromagnetic waves
a) the transfer of heat by the movement of fluids
which method of heat transfer is used in a barbeque?
- Conduction.
- Radiation.
- Convection.
- Sub-fusion.
2&3 radiation, and convection
Which method of heat transfer is used in clothes driers
conduction
Radiation
Convection
Sub fusion
Convection
The components of a standard underfired storage water heater are a/an:
a) auntie scald device, and a pump control
b) pump, pump, control, flow, switch, temperature, and a pressure relief valve
c) temperatures and pressure, relief valve, anode, and dip tube
c)
T or F
A gravity, warm air furnace does not have a fan blower
T
A residential central forced air gas, furnace, heating system works on the principle of
Cold air from the central areas of the house is forced across the heat, exchanger and back into the house
What is the configuration of a “hi boy” forced air gas furnace.
supply air, exiting the top and return air entering the bottom
return and supply air. Plenum’s are both located at the top of the furnace. This indicates that it is a …
hi boy or low boy
low boy
which of the following vent systems can be employed to vent a recessed wall furnace?
no vent required
BW vent
C vent
L vent
BW vent
A Bunsen type flame is identified by its appearance as being :
a blue flame
if the gas/ air velocity is two gray at the point of an atmospheric burner, the flame will have a tendency to
a) Lift off the port
b) flashback in to the port
c) prevent pre-mixing of gas and air
d) be long and yellow
a) lift off port
if the air shutters on an atmospheric burner become plugged with dirt, the flame may
a) lift off the burner
b) appear blue and harsh
c) appear yellow and long
d) extinguish due to reduce gas supply
c) appear yellow and long
An open circuit test of a powerpile should give a reading in the range of …
a) 10 -20 mV
b) 30-90 mV
c) 20- 30 mV
d) hundreds of mV
d) hundreds of mV
an open circuit test reading of a thermocouple flame sensor should be in the range of
a) 10 -20 mV
b) 2-4 mV
c) 20- 30 mV
d) 250-750 mV
c) 20-30 mV
a closed circuit of a thermocouple flame sensor should be in the range of
a) 10 -20 mV
b) 2-4 mV
c) 20- 30 mV
d) 250-750 mV
a) 10 -20 mV
how many screws should there be when connecting sections of vents together?
3
a stationary device used to divert the flow of fluegases is called a
a) baffle
b) gas burner
c) automatic vent damper
d) overpressure protection device
a) baffle
what is the normal relief valve set pressure on of a propane cylinder
375 psi
what is the normal relief valve set pressure on of a propane tank
250psi
what method of heat transfer does a clothes dryer use
convection
What is excess air?
Air in the combustion zone, in addition to which is required for combustion
If an atmospheric burner is supplied with too much primary air, the result may be
A lifting flame
what is the minimum distance below a commercial parking lot that Gas piping is allowed to be buried
15”
24”
18”
30”
24”
The unthreaded portion of a piping I will let shall extend at least____” through the floor
1”
2”
3”
4”
2”
how is the high limit tested
a) by disconnecting the air circulation blower
b) by disconnecting the wire to the limit control
c) by disconnecting one wire on the thermostat when the furnace is warm
d) by shutting the gas control to allow the furnace to cool down
a) disconnecting the air circulation blower
A wavy flame delivered by a forced air furnace may indicate …
a) too much primary air
b) A lack of primary here
c) a cracked heat exchanger
d) too much secondary air
c) a cracked heat exchanger
The high limit on a gravity type furnace shall have a setting of:
a) 200f
b) 250f
c) 300f
d) 350f
d) 350
What is the term given to all the air used by an atmospheric burner?
a) combustion air
b) dilution air
c) excess air
d) total air
d) total air
normal drop out reading of a thermocouple flame speed sensor should be in the range of …
2-4mV
