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HVACR Unit 55 Exam: Questions and Answers, Exams of Engineering

Carroll Community CollegeEngineering

A series of questions and answers related to hvacr unit 55, covering topics such as oil furnace operation, fuel oil types, and burner components. It offers a valuable resource for students studying hvacr, providing insights into key concepts and practical applications. Structured as a question-and-answer format, making it easy to navigate and understand.

Typology: Exams

2024/2025

Available from 11/14/2024

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HVACR UNIT 55 EXAM | QUESTIONS &
ANSWERS (VERIFIED) | LATEST UPDATE |
GRADED A+
A major difference between the operation of an oil furnace and a gas furnace is that:
Correct answer: The oil must be atomized before ignition.
An oil furnace heat exchanger is built:
Correct answer: Like a drum.
How are oil burner nozzles rated?
Correct answer: Cone shape, spray angle, and GPH
Modern residential oil furnaces sense the flames using:
Correct answer: A cadmium sulfide cell.
Sealed combustion oil furnaces use:
Correct answer: High static oil burners.
Select the functions that the primary control performs. You may select more than one.
Correct answer: Provides flame safety shutdown,
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Download HVACR Unit 55 Exam: Questions and Answers and more Exams Engineering in PDF only on Docsity!

HVACR UNIT 55 EXAM | QUESTIONS &

ANSWERS (VERIFIED) | LATEST UPDATE |

GRADED A+

A major difference between the operation of an oil furnace and a gas furnace is that: Correct answer: The oil must be atomized before ignition. An oil furnace heat exchanger is built: Correct answer: Like a drum. How are oil burner nozzles rated? Correct answer: Cone shape, spray angle, and GPH Modern residential oil furnaces sense the flames using: Correct answer: A cadmium sulfide cell. Sealed combustion oil furnaces use: Correct answer: High static oil burners. Select the functions that the primary control performs. You may select more than one. Correct answer: Provides flame safety shutdown,

Controls ignition transformer, Starts and stops oil burner motor The cad cell senses the flames by: Correct answer: Dropping in resistance when exposed to light. The grade of fuel oil most commonly used in residential oil-fired furnaces is: Correct answer: Number 2. The grades of fuel oil are 1 through 6 with: Correct answer: 1 being the lightest and most distilled and having the lowest heating capacity. The heat in the combustion chamber is reflected and concentrated by the: Correct answer: Refractory The heating capacity of number 2 fuel oil is approximately: Correct answer: 140,000 BTU per gallon. The ignition operating sequence and flame safety are controlled on an oil burner by: Correct answer: The primary control. The ignition transformer provides:

What is a residual oil? Correct answer: A residual is what is left after all the distillates have been vaporized. What is oil viscosity? Correct answer: Viscosity is a measure of the thickness of the oil. What is the purpose of the second line on a two-pipe oil delivery system? Correct answer: To send the oil that was pumped but not burned back to the tank Which grade of fuel oil has the highest viscosity? Correct answer: Number 6 Which is the result of the twisting motion of the heated helix? Correct answer: Activation of the limit control switch Which of the following features increases overall efficiency to between 83 and 89%? Correct answer: Sealed combustion chamber Which of the following grades of oil are the grades of fuel oil primarily used for comfort heating applications? Correct answer: 1 and 2

Which of the following measures is the minimum steam pressure for a high-pressure boiler? Correct answer: 15 psi Which of the following statements is TRUE about a Grade 1 fuel oil? Correct answer: The oil consists of 100 percent light distillates. Which part of the nozzle produces the correct firing rate? Correct answer: Orifice Why can oil furnaces operate at higher efficiencies than gas furnaces without condensing water in the heat exchanger or vent? Correct answer: The flue gas contains only half as much water as flue gas from a gas furnace. With what must the nozzle spray pattern be compatible for proper mixing? Correct answer: Burner air pattern