Week 3 Unit 66 Electric Heat Exam

An advantage of a warm-air electric furnace compared to an oil or gas furnace is:

• Lower power requirements.

• Warmer supply air temperatures.

• Lower operating cost in most parts of the country.

• No vent pipes, chimney, or makeup air are required.

What is the heat output of an electric furnace rated at 15 kilowatts on 240 volts?

• 15 kW × 1,000 = 15,000 BTU/h

• 15 kW × 240 = 36,000 BTU/hr

• 15 kW × 3,412 = 51,180 BTU/hr

• The heat output cannot be calculated using the kilowatt output.

What is the formula to figure out how much electric heat is produced by an electric furnace?

• Volts = Watts × Amps

• Watts = Volts × Amps

• Amps = Amps × Volts

• Watts = Volts × Gas

What power source does a electric heater normally operate on?

• 200 V to 240 V

• 300 V to 400 V

• 150 V to 250 V

• 208 V to 240 V

What is one common application of an electric heating furnace?

• Combining it with a cool heat pump

• Combining it with a split-system heat pump

• Combining it with a triple-system heat pump

• Combining it with a multisystem heat pump

What happens when the outdoor temperature drops?

• The heat pump alone may not be able to maintain a comfortable indoor temperature.

• The heat pump will be able to maintain a comfortable indoor temperature.

• The heat pump will automatically turn on when the outdoor temperature drops.

• The heat pump will adapt the inside temperature anytime the outdoor temperature drops.

Each electric furnace is designed to hold which of the following?

• A specific type and size of heating oxidation

• A specific type and size of heating element rack

• A specific type and size of heating fan

• A specific type and size of the nickel-chrome alloy

What is the kilowatt rating of an electric furnace rated at 240 V and 30 A?

• 240 V/30 A = 8 kW

• 240 V × 30 A = 7,200 W, which is 7.2 kW

• 240 V × 30 A = 7,200 W, which is 72 kW

• Kilowatts cannot be calculated using only volts and amps.

How are electric heating elements rated?

• Electric heating elements are rated by their kW capacity.

• Indoor or outdoor applications

• Electric heating elements are rated in joules.

• Electric heating elements are rated in degrees Fahrenheit.

When does the blower on an electric furnace operate?

• The blower operates independently of the heating elements.

• The blower operates when the first heating element is energized.

• The blower operates whenever the last heating element is energized.

• The blower operates whenever any of the heating elements are energized.