UTB11 Heating Systems

Question 1

Which metal is the best reflector of heat?

Answer 1

Polished

Question 2

What type of heating medium is used to produce heat in a unit heater?

Answer 2

Hot water

Question 3

What is the range of the Fahrenheit thermometer between the freezing point and the boiling point?

Answer 3

180°

Question 4

The sum of sensible heat plus latent heat is the definition of what term?

Answer 4

Total heat

Question 5

What principle is the transfer of heat by means of mediums such as water, air, and steam?

Answer 5

Convection

Question 6

What principle is the transfer of heat through space?

Answer 6

Radiation

Question 7

What fuels are most commonly used with heating equipment?

Answer 7

Coal, oil and gas

Question 8

What is the major element present in natural gas?

Answer 8

Methane

Question 9

Butane and propane are part of what group of liquefied gases?

Answer 9

Liquified petroleum gas

LPG

Question 10

How many types of unit heaters are currently utilized in the Seabee community?

Answer 10

3

(1) suspended horizontal discharge
(2) suspended vertical discharge
(3) floor- mounted or horizontal type of
blower unit

Question 11

Unit heaters rated for less than 50,000 BTUs per hour are designated to operate on what systems?

Answer 11

low-pressure steam
OR
high- temperature hot water

Question 12

One kilowatt is equal to how many BTUs per hour?

Answer 12

3,415 BTU per hour

Question 13

Why is the vented gas heater more satisfactory than the unvented type?

Answer 13

Less danger of carbon monoxide poisoning

Question 14

The burning of 1,000 cubic feet of natural gas will produce approximately how many gallons of water?

Answer 14

12

Question 15

What grade of fuel oil is required in oil-fired space heaters?

Answer 15

Light

Question 16

A perforated sleeve burner with its circular fuel vaporizing grooves burns what color flame?

Answer 16

Blue

Question 17

What controls the flow of oil in the pot type and perforated sleeve burners?

Answer 17

Float-operated metering valve

Question 18

A chimney top is required to be how many feet above the highest point of a building?

Answer 18

3

Question 19

What type of piping or tubing is used in oil supply systems to the burners?

Answer 19

Copper

Question 20

Warm-air systems are identified as what types?

Answer 20

Gravity and forced-air

Question 21

What part does the plenum join up with in a furnace?

Answer 21

Main trunk duct

Question 22

What is the result of improperly placed supply diffusers?

Answer 22

Air stratification

Question 23

(True or False) In an individual duct system, each duct is connected directly to the furnace plenum.

Answer 23

True

Question 24

What is a register temperature range of a forced warm-air system?

Answer 24

150°F to 180°F

Question 25

What is the most commonly used airflow design associated with a gas- fired furnace?

Answer 25

Upflow highboy

Question 26

Duct furnaces are mounted in a duct system where air circulation is provided by what?

Answer 26

External fan

Question 27

Along with the return-air compartment and warm-air compartment, what other compartment comprises the gas-fired furnace?

Answer 27

Combustion air and fuel

Question 28

What type of blower is installed in a gas-fired furnace?

Answer 28

Centrifugal

Question 29

``` Which piece of equipment is NOT part of the gas burner control? A. Gas pressure regulator B. Humidifier C. Manual gas cock D. Heat exchanger ```

Answer 29

C. Manual gas cock

Question 30

What piece of equipment maintains the desired pressure in the burner as long as the gas main pressure is above the desired pressure?

Answer 30

Gas pressure regulator

Question 31

What position does the solenoid gas valve revert to upon a current failure?

Answer 31

Closes automatically

Question 32

How does the design of a recycling solenoid gas valve differ from a standard solenoid gas valve?

Answer 32

Allows the valve to switch to manual operation during a power failure.

Question 33

What device is used to produce the electrical current used to operate gas valves?

Answer 33

thermocouples and | thermopiles

Question 34

What device shuts off the gas supply when the temperature inside the heating unit becomes excessive?

Answer 34

Limit control

Question 35

What device is used to reduce updrafts that are detrimental to pilot or burner operation?

Answer 35

Diverter

Question 36

What is the voltage produced by the step-up transformer used in a gas fired furnace?

Answer 36

10,000

Question 37

What piece of equipment runs the fuel unit of a gas-fired furnace?

Answer 37

Blower motor shaft

Question 38

Which grade of fuel oil is used in a gas-fired furnace?

Answer 38

High

Question 39

What device closes the ignition circuits when the thermostat calls for more heat?

Answer 39

Primary control

Question 40

(True or False) The limit control is a device that responds to changes in steam pressure in a steam-heating system.

Answer 40

False | air pressure vs steam

Question 41

What type of element is used in a vapor-tension device?

Answer 41

Highly volatile liquid

Question 42

Other than the snap-action electrical switch, which other electrical switch is often utilized?

Answer 42

Mercury

Question 43

What is the nerve center of the heating-control system?

Answer 43

Thermostat

Question 44

How far up on the wall should a thermostat be placed, in feet?

Answer 44

4-1/2'

Question 45

(True or False) Gas-fired and oil-fired forced-air units, which have the blower below the heating element or combustion chamber, should be set on masonry at least 4 inches thick.

Answer 45

False | 3"

Question 46

What is the clearance requirement, in feet, of a furnace from wood or other combustible material?

Answer 46

18" or 18' as per question this question is stupid

Question 47

One inch of free-air area is required for how many BTUs per hour of furnace input rating?

Answer 47

1000

Question 48

What type of material and diameter piping or tubing are required from the oil tank or valve to the burner?

Answer 48

Copper, 1/2 inch

Question 49

What size is recommended for all vent lines used in furnace installations?

Answer 49

1-1/2"

Question 50

Why are kerosene, diesel oils, and commercial oils of Grades Nos. 1 and 2 suitable for furnace usage?

Answer 50

They vaporize at relatively low temperatures.

Question 51

(True or False) Burners using air as the atomizing medium are designed for three air pressure ranges.

Answer 51

True low: 2 psi med: 25 psi high: 100 psi

Question 52

At what speed, in rpm, does a cylindrical cup use in a horizontal rotary-cup burner rotate?

Answer 52

3,450

Question 53

What is used to remove the air from a burner prior to starting?

Answer 53

Petcock

Question 54

Which is NOT a cause for a flame that is raw and stingy in a oil burner? A. Partly clogged nozzle B. Air in the pump C. Too large an opening in air adjustment D. Improper draft

Answer 54

D. Improper draft

Question 55

After the burner flame and draft are properly adjusted, a flue-gas analysis should show a CO2 content of approximately what percent?

Answer 55

10%

Question 56

If the furnace is large enough and the burner has been set for correct oil flow and minimum amount of air, stack temperature should not exceed how many degrees?

Answer 56

600°F

Question 57

The stack thermometer is used to determine the temperature of gases in what piece of equipment?

Answer 57

Smoke pipe

Question 58

``` What is a possible problem in an oil pump, if you have no oil flow at the nozzle? A. Blown seal B. Air leak in intake line C. Loose plugs or fittings D. Bad coupling alignment ```

Answer 58

B. Air leak in intake line

Question 59

What is the disadvantage of using cast iron hot-water heating boilers?

Answer 59

Sections cracking

Question 60

How many inches above a finished floor should a low-temperature hot water boiler be?

Answer 60

2

Question 61

Where is the pressure-relief valve located on a boiler used in a low- temperature hot water system?

Answer 61

Top of the boiler

Question 62

What is another name for the airflow switch used in a low-temperature hot water system?

Answer 62

Sail switch

Question 63

(True or False) A one-pipe, open-tank gravity distribution system consists of a single pipe that carries hot water to all of the radiators and then returns it back to the boiler.

Answer 63

True

Question 64

The amount of temperature drop between the beginning and the end of the line depends on the length of the main and what other factor?

Answer 64

Heating load

Question 65

The relief valve located in a closed pneumatic compression system is set to lift at what water pressure level, in psi?

Answer 65

Over 30 psi

Question 66

In the heating of larger installations where more than one building is involved, what type of circulation method is used?

Answer 66

Forced circulation

Question 67

Mains and branches are pitched so air in the system is discharged through which device?

Answer 67

Radiators and open expansion tanks relief valves

Question 68

How many radiator types are you concerned with as a UT?

Answer 68

2 Cast iron Fin-tubed

Question 69

(True or False) Circulating pumps used in low-temperature hot water distribution systems ensure the positive flow of water regardless of the height of the system or the rise in water temperature.

Answer 69

True

Question 70

Where is the reducing valve installed on the boiler?

Answer 70

At the same level as top of boiler

Question 71

``` Which is a reason why radiators do not heat? A. Not enough air in the system B. Insufficient water in the system C. Clogged fin-tubes D. Closed radiator valve ```

Answer 71

B. Insufficient water in the system

Question 72

What is the high temperature range for most military and federal heating plants?

Answer 72

350°F to 450°F

Question 73

Whose permission is needed to install an HTHW plant that operates above 400°F?

Answer 73

Naval Facilities Engineering Command

Question 74

What type of pump is used in an HTHW system?

Answer 74

Centrifugal

Question 75

Why is an expansion tank required in an HTHW system?

Answer 75

To allow for water expansion when heated.

Question 76

What is the optimal pH range for an HTHW system?

Answer 76

9.3 - 9.9

Question 77

Upon completion of an installation of an HTHW system, the entire system is held under what pressure, in psi, for not less than 24 hours?

Answer 77

450 psi

Question 78

Generator tubes utilized in HTHW systems are subjected to an ASME test pressure of what value, in psi?

Answer 78

900 psi

Question 79

What does HTHW stand for?

Answer 79

High temperature hot water systems