In an electric snow melting unit, a thermostat should be used to automatically shut the system down when the outdoor temperature is above

In an electric snow melting unit, a thermostat should be used to automatically shut the system down when the outdoor temperature is above

a) 0 degrees C
b) 1 degrees C
c) 2 degrees C
d) 3 degrees C




Answer: C

The main disadvantage of electric heating is the

The main disadvantage of electric heating is the

a) high maintenance cost
b) poor local temperature control
c) expensive installation
d) high operating cost
e) all of the above





Answer: D

Which of the following is not a gas-fired infrared heater?

Which of the following is not a gas-fired infrared heater?

a. Surface combustion heater
b. Low temperature catalytic heater
c. Quartz tube heater
d. Vented heater
e. Directly fired





Answer: C

One of the advantages of gas-fired infrared heating over other types of heating systems is:

One of the advantages of gas-fired infrared heating over other types of heating systems is:

a. It can heat a large volume enclosure with little fuel
b. It requires no fuel handling equipment
c. It eliminates the need for ventilation
d. It can provide effective spot heating
e. It can be used efficiently as the main heating source for a large building






Answer: D

Infrared heaters are used in:

Infrared heaters are used in:

a. Theaters
b. Lecture halls
c. Libraries
d. Skating rinks
e. Offices





Answer: D

Infrared heaters send out _____ energy in the form of invisible infrared waves that travel in straight lines through the air.

Infrared heaters send out _____ energy in the form of invisible infrared waves that travel in straight lines through the air.

a. Convection
b. Conduction
c. Radiant
d. Microwave
e. Electrical






Answer: C

The quartz lamp heating element will respond:

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






Answer: B

A low temperature catalytic heater contains a layer of:

A low temperature catalytic heater contains a layer of:

a. Metal impregnated with a ceramic material
b. Wool fiber impregnated with a catalyst
c. A ceramic mat impregnated with a catalyst
d. Glass wool impregnated with a catalyst
e. Porous glass impregnated with a catalyst






Answer: D

Electrical heating can be divided into two general groups:

Electrical heating can be divided into two general groups:

a. Radiant and convective
b. Direct and indirect
c. AC and DC
d. Radiant panel and infrared
e. Ultraviolet and infrared




Answer: B

:One of the advantages of electric heating over other heating systems is:

One of the advantages of electric heating over other heating systems is:

a. Low operating cost
b. No fuel storage or handling equipment
c. Ideal for large warehouses
d. High operating temperatures
e. It can be direct or indirect





Answer: B

Most gas-fired infrared heaters use the principle of:

Most gas-fired infrared heaters use the principle of:

a. Indirect heating of a gas
b. Heating a solid surface
c. Heating a liquid
d. Heating a porous material
e. Catalytic oxidation of a fuel at high combustion temperatures





Answer: B

Infrared heaters are usually mounted:

Infrared heaters are usually mounted:

a. Overhead
b. At shoulder height
c. In floors
d. Under windows
e. Over doors




Answer: A

One of the advantages of electric infrared heating by quartz lamp is:

One of the advantages of electric infrared heating by quartz lamp is:

a. It can heat a large area effectively
b. No ventilation is required
c. It can be used as the main heating source for a large building
d. It is not seriously affected by exposure to wind
e. It can be used in explosive atmospheres




Answer: D

Of the following, which is a method of indirect electric heat?

Of the following, which is a method of indirect electric heat?

a. Baseboard heaters
b. Electric boilers
c. Radiant panel heaters
d. Wall heaters
e. Unit heaters





Answer: B

In an open wire type, heating element, the resistance wire is made of:

In an open wire type, heating element, the resistance wire is made of:

a. Tungsten
b. Magnesium oxide
c. Mica
d. Steel
e. Nickel-chromium





Answer: E

In an internally fired, gas-fired infrared heater, the surface temperature is about:

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




Answer: B

Infrared radiant energy is directed towards:

Infrared radiant energy is directed towards:

a. Ceilings
b. Walls
c. Windows
d. Floors
e. Doors



Answer: D