Book 2 Chapter 9: Infrared & Electric Heating

Question 1

Infrared heaters heat the air as the waves pass through it.
A) True
B) False

Answer 1

B) False

Question 2

What is the emission temperature of a directly fired refractory heater?
A) 400ºC (750ºF)
B) 315ºC-455ºC (600ºF-850ºF)
C) 760ºC-900ºC (1400ºF-1650ºF)
D) 980ºC-1260ºC (1800ºF-2300ºF)

Answer 2

D) 980ºC-1260ºC (1800ºF-2300ºF)

Question 3

What is the emission temperature of a low temperature catalytic heater?
A) 400ºC (750ºF)
B) 315ºC-455ºC (600ºF-850ºF)
C) 760ºC-900ºC (1400ºF-1650ºF)
D) 980ºC-1260ºC (1800ºF-2300ºF)

Answer 3

B) 315ºC-455ºC (600ºF-850ºF)

Question 4

What is one disadvantage of electric heating systems?

Answer 4

Cost of operation

Question 5

Heating elements are made of metals that offer ________ to the flow of an electric current. The most common material used is _________.

Answer 5

High resistance, Nickel-chromium

Question 6

What are three advantages to installing a baseboard electric heater?

Answer 6

Easy to install
Takes up minimum space
Quiet operation-no moving parts

Question 7

Infrared heaters send out ______ energy in the form of invisible infrared waves that travel in straight lines through the air.
A) Geothermal
B) Electrical
C) Conduction
D) Convection
E) Radiant

Answer 7

E) Radiant

Question 8

A low temperature catalytic heater contains a layer of _________ impregnated with a catalyst.
A) Plastic fibre
B) Wool fibre
C) Glass wool
D) Porous glass
E) Metal

Answer 8

C) Glass wool

Question 9

Infrared radiant energy is directed towards:
A) Walls
B) Floors
C) Ceilings
D) Doors
E) Windows

Answer 9

B) Floors

Question 10

Forced convection type wall heaters:
A) Are equipped with air filters
B) Provide coil bypass dampers
C) Utilize a fan to blow heated air into the room
D) Provide outside air temperature
E) Use natural circulation to heat air

Answer 10

C) Utilize a fan to blow heated air into the room

Question 11

When used for comfort heating infrared heaters are usually mounted:
A) Under windows
B) Over doors
C) Overhead
D) On walls
E) In floors

Answer 11

C) Overhead

Question 12

Electric snow melter heating elements are generally:
A) Along the side of the drive
B) Buried in concrete or pavement
C) Mounted overhead
D) Work by induction
E) In blower outlets

Answer 12

B) Buried in concrete or pavement

Question 13

Which of the following is the equipment used for direct electric heating systems?
1. Electric boilers
2. Baseboard heaters
3. Wall heaters
4. Unit heaters
5. Warm air furnaces

A) 1,2,3
B) 2,4,5
C) 2,3,4
D) 3,4,5
E) 1,3,5

Answer 13

C) 2,3,4

Question 14

Infrared heaters are used in:
A) Offices
B) Theatre
C) Libraries
D) Skating rinks
E) Lecture halls

Answer 14

D) Skating rinks

Question 15

Wall heaters are:
A) Considered infrared heaters
B) Of the radiant type
C) Mounted overhead
D) Of the convection type
E) The convection or the radiant type

Answer 15

E) The convection or the radiant type

Question 16

Electric heating can be divided into two general groups:
A) Direct and indirect
B) Wall and baseboard
C) Radiant panel and infrared
D) Direct and infrared
E) Floor and wall

Answer 16

A) Direct and indirect

Question 17

Which electrical heating element is used in convection type liquid heaters:
A) Open wire
B) Tubular cased wire
C) Closed ribbon
D) Open ribbon
E) Closed tubular

Answer 17

B) Tubular cased wire

Question 18

Infrared heaters send out radiant energy in the form of invisible infrared waves that strike a solid opaque object and converted into:
A) Temperature
B) Pressure
C) Energy
D) Power
E) Heat

Answer 18

E) Heat

Question 19

Infrared heating is a form of ________ heating that only in recent times has found widespread use in comfort heating.
A) Radiant
B) Convection
C) Hot air
D) Conduction
E) Hydronic

Answer 19

A) Radiant

Question 20

Each electric resistance baseboard heater may be controlled by a _______ either directly mounted on the unit or on the wall.
A) Thermostat
B) Aquastat
C) Resistor
D) Humidistat
E) Thermistor

Answer 20

A) Thermostat

Question 21

A disadvantage of the quartz tube electric infrared heating element is its:
A) Response time (heat up)
B) Wind resistance
C) Impact resistance
D) Thermal shock resistance
E) Vibration resistance

Answer 21

C) Impact resistance

Question 22

Some of these advantages of electricity as a source of heat over other heating systems include the following except:
A) The operation of the heating devices is clean and silent
B) The cost of installation is lower
C) The equipment requires more space
D) Individual room temperature control is easily obtained
E) No combustion and combustion gases

Answer 22

C) The equipment requires more space

Question 23

The metal sheath electric infrared heating element is a:
A) Tube similar to a fluorescent tube
B) Coiled nickel-chrome element enclosed in an air-filled quartz tube with capped ends
C) Bulb similar to an incandescent light bulb
D) Sealed quartz tube filled with inert gas containing a tungsten filament supported by tantalum spacers
E) Metal tube 9.5mm (3/8in) in diameter and up to 198cm (78in) in length

Answer 23

E) Metal tube 9.5mm (3/8in) in diameter and up to 198cm (78in) in length

Question 24

An example of radiant heating can be found in:
A) Offices
B) Residences
C) Hotels
D) Skating rinks
E) Hospitals

Answer 24

D) Skating rinks

Question 25

Some of these advantages of electricity as a source of heat over other heating systems include the following except:
A) The equipment requires less space
B) Individual room temperature control is easily obtained
C) No combustion and combustion gases
D) The cost of installation is lower
E) The operation of the heating devices very noisy

Answer 25

E) The operation of the heating devices are very noisy

Question 26

With the _______ heating method of heating the heat is transferred from the source of heat to the air and/or persons and objects in these areas.
A) Direct
B) Radiant
C) Steam
D) Convection
E) Hot water

Answer 26

A) Direct