Appliances

Question 1

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

Answer 1

c) the transfer of heat from particle to particle

Question 2

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

Answer 2

a) the transfer of heat by the movement of fluids

Question 3

which method of heat transfer is used in a barbeque?

1. Conduction.
2. Radiation.
3. Convection.
4. Sub-fusion.

Answer 3

2&3 radiation, and convection

Question 4

Which method of heat transfer is used in clothes driers

conduction
Radiation
Convection
Sub fusion

Answer 4

Convection

Question 5

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

Answer 5

c)

Question 6

T or F

A gravity, warm air furnace does not have a fan blower

Answer 6

T

Question 7

A residential central forced air gas, furnace, heating system works on the principle of

Answer 7

Cold air from the central areas of the house is forced across the heat, exchanger and back into the house

Question 8

What is the configuration of a “hi boy” forced air gas furnace.

Answer 8

supply air, exiting the top and return air entering the bottom

Question 9

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

Answer 9

low boy

Question 10

which of the following vent systems can be employed to vent a recessed wall furnace?

no vent required
BW vent
C vent
L vent

Answer 10

BW vent

Question 11

A Bunsen type flame is identified by its appearance as being :

Answer 11

a blue flame

Question 12

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

Answer 12

a) lift off port

Question 13

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

Answer 13

c) appear yellow and long

Question 14

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

Answer 14

d) hundreds of mV

Question 15

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

Answer 15

c) 20-30 mV

Question 16

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

Answer 16

a) 10 -20 mV

Question 17

how many screws should there be when connecting sections of vents together?

Answer 17

3

Question 18

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

Answer 18

a) baffle

Question 19

what is the normal relief valve set pressure on of a propane cylinder

Answer 19

375 psi

Question 20

what is the normal relief valve set pressure on of a propane tank

Answer 20

250psi

Question 21

what method of heat transfer does a clothes dryer use

Answer 21

convection

Question 22

What is excess air?

Answer 22

Air in the combustion zone, in addition to which is required for combustion

Question 23

If an atmospheric burner is supplied with too much primary air, the result may be

Answer 23

A lifting flame

Question 24

what is the minimum distance below a commercial parking lot that Gas piping is allowed to be buried

15”
24”
18”
30”

Answer 24

24”

Question 25

The unthreaded portion of a piping I will let shall extend at least____” through the floor

1”
2”
3”
4”

Answer 25

2”

Question 26

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

Answer 26

a) disconnecting the air circulation blower

Question 27

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

Answer 27

c) a cracked heat exchanger

Question 28

The high limit on a gravity type furnace shall have a setting of:

a) 200f
b) 250f
c) 300f
d) 350f

Answer 28

d) 350

Question 29

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

Answer 29

d) total air

Question 30

normal drop out reading of a thermocouple flame speed sensor should be in the range of …

Answer 30

2-4mV