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6 Cards in this Set
- Front
- Back
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In an open wire type heating element, the resistance wire is made of: 1) Magnesium oxide 2) Tungsten 3) Nickel-chromium 4) Steel 5) Mica |
Nickel-chromium |
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The quartz lamp heating element will respond: 1) Instantaneously 2) In about one minute 3) In about thirty seconds 4) In about three minutes 5) In a few seconds |
In a few seconds |
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One of the advantages of electric infrared heating by quartz lamp is: 1) It can heat a large area entirely 2) No ventilation is required 3) Power failure does not affect the operation of the heater 4) That it's not seriously affected by wind exposure 5) It can be used as the main heating source for a large building |
That it's not seriously affected by wind exposure |
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In an internally fired gas-fired infrared heater, the surface temperature is about: 1) 700ºC 2) 500ºC 3) 300ºC 4) 400ºC 5) 600ºC |
400ºC |
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In an electric snow melting unit, a thermostat should be used to automatically shut the system down when the outdoor temperature is above: 1) 2ºC 2) 3ºC 3) 1ºC 4) 0ºC 5) 4ºC |
2ºC |
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Which of the following are the most commonly used electric infrared heaters? 1. Low temperature catalytic heater 2. Metal sheath element 3. Internally-fired heater 4. Quartz tube heater 5. Quartz lamp 1) 2, 4, 5 2) 2, 3, 4 3) 3, 4, 5 4) 1, 2, 3 5) 1, 3, 5 |
2, 4, 5 |
