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55 Cards in this Set
- Front
- Back
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F.C. The diagram that would show you the most information about sequence of operation is an: |
Flow Chart |
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F.C. The designation of L1 (Hot) on a ladder diagram means: |
Hot or black Wire |
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F.C. The switch is always placed before the load on a ladder diagram? T or F |
True |
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F.C. All electrical circuits require which three things? |
Load, conductor, and power source |
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F.C. How are the controls on a wiring diagram shown? |
Appliance Off |
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F.C. What is the purpose of a thermocouple? |
To produce 20-30 millivolts of power to energize and electromagnet in the power unit which keeps the gas flowing to the pilot |
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F.C. The power unit and the thermocouple together make up a system called: |
Flame safeguard |
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F.C. Three bimetal temperature sensing devices are: |
Strip type, spiral type, and disc type |
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F.C. What is the purpose of an anticipator? |
To anticipate the temperature in the room, shutting down the furnace just before the temperature reaches the setting on the thermostat. |
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F.C. On a heat only thermostat, the contacts will: |
Close on temperature decrease. |
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F.C. The fan control in the furnace: |
Turns the fan off between 90 and 100 degrees Fahrenheit and on between 120 and 140 degrees Fahrenheit. Minimum difference of 35 degrees Fahrenheit. |
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F.C. Limits with reset on them can be used to replace snap disc fan controls with summer fan switches? T or F |
False |
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F.C. What is the main purpose of a limit switch? |
To shut down the gas supply, should the furnace get too hot. |
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F.C. Transformers found in furnaces : |
Take 120 volts AC and transform it into 24 volts AC through magnetic induction |
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F.C. The creation of electricity is considered to be the: |
Altering of one form of energy to another form of energy. |
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F.C. Matter exists in one of several states because of: |
The temperature to which matter is heated. |
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F.C. Compounds are made up of: |
Elements that have chemically combined. |
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F.C. Constituents of the atom include: |
Electrons, protons and neutrons |
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F.C. Electrons orbit the nucleus of the atom in pathways called: |
Shells |
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F.C. Amperage is known as the measurement of: |
Electrical current flowing through a conductor |
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F.C. Electrical pressure is measured in: |
Volts |
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F.C. The resistance to current flow of an electrical circuit is expressed in units of resistance called: |
Ohms |
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F.C. Electromagnetism can be produced by: |
Electrical current flow creating a magnetic field around a conductor |
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F.C. The strength of an electromagnet is dependent on three factors: |
Type of core material, number of turns made around the core and voltage applied to conductors. |
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F.C. All circuits have a power source, a path for electron flow, a control device and a power consumer called a/an: |
Load |
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F.C. The name applied to various circuits comes from: |
The arrangement of conductors and components. |
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F.C. The Ohm’s law triangle is used to: |
Develop a formula to solve for an unknown quantity in an electrical circuit. |
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F.C. In a parallel circuit, total resistance is: |
Less than the smallest resistances in the circuit. |
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F.C. In a series circuit, total resistance is: |
The sum of all resistances in the circuit. |
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F.C. What is ohms law in the form of an equation? |
Back (Definition) |
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F.C. Materials that have less than 3 valence electrons are called: |
Conductors |
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F.C. When one electron bumps into another electron and this bumping continues throughout a conductor, this bumping action is called: |
Electron flow |
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F.C. The measurement of electron flow is: |
Amps |
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F.C. The measurement of EMF is____? What does EMF stand for? |
Electromotive Force, Volts |
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F.C. Current flows first in one direction and then reversed itself is called: |
Alternating current. |
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F.C. What would you use to measure resistance? |
Ohm meter |
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F.C. What would you use to measure the quantity of electron flow? |
Ammeter |
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F.C. By adding more resistance in a circuit the current flow will: |
Decrease. |
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F.C. By reducing the resistance fin a circuit the current flow will: |
Increase |
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F.C. The unit of measurement for energy that has been changed from electrical energy to mechanical energy is: |
Watts |
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F.C. What is the main difference between an intermittent pilot gas valve and a direct ignition gas valve? |
The direct ignition gas valve has no pilot connection |
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F.C. When using the electronic ignition, what is the process of proving the flame called? |
Flame rectification |
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F.C. What is the minimum flame rod to ground electrode area that is immersed in the flame? |
1:4 Flame to Ground (4:1 ground to flame) |
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F.C. Why have the flame conductivity systems not been used for proving the flame? |
The system will not distinguish between a flame and a short to ground |
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F.C. What is the first step in the sequence of operation for any heating appliance with electronic ignition? |
There is a call for heat at the thermostat |
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F.C. What is the importance of the connection diagram? |
It shows where the wires go and the colour of the wires |
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F.C. What is the importance of the ladder diagram? |
It shows how the appliance works for troubleshooting. |
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F.C. It is considered safe practice to inspect the electrical connections with the power turned on? T or F |
False! |
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F.C. A typical circuit board on any furnace will have only one voltage. T or F |
False |
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F.C. What is the maximum distance the supports can be apart on System 636 (BH vent) venting? |
Five feet |
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F.C./G.F. What are the calorific values for Natural Gas and Propane Gas? |
Natural Gas (CH4) 1000 cubic Ft Propane (C3H8) 2500 cubic ft |
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F.C. How is temperature rise calculated? |
The difference of the return air temperature and the supply air temperature |
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F.C. What is the material called that is used to separate the two plates in a capacitor? |
Dielectric |
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F.C. Name the three main designs of pilot burners. |
Aerated Non-Aerated (Non-linting) Post aerated (incinerating/target) |
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F.C. What is the fixed element that controls the amount of gas that a pilot will burn? |
Orfice |
