Gas - XMiscellaneous Flashcards
What is the estimated size of a proton?
0.07 trillionth of an inch in diameter.
The number of ______ that each atom has in it’s nucleus determines it’s atomic number.
Protons.
Atoms resist releasing their electrons because a phenomenon known as _____________.
Chemical stability.
All that is really required to produce electromagnetism is ___________ between conductor and a magnetic field.
Relative motion.
The effect of pressure in causing electrical charges is the definition of?
Piezoelectricity.
An electric charge which results when two pieces of material (such as a rubber rod and a piece of fur) are rubbed together and electrons from one material are passed to the other is the definition of?
Static electricity.
Electricity produced from friction is called the ________ effect.
Triboelectric.
When a light beam strikes certain materials (including potassium and sodium), the energy from the photons causes the atoms to release electrons is the definition of?
Photoelectricity or the photoelectric effect.
All atoms share the valence electrons and become bound together is the definition of:
Metallic bonding.
Neon light is an example of?
Television tube is an example of?
Fluorescent light bulb is an example of?
Electroluminescence.
Phosphorescence[][][]]
Fluorescence[][][][][][][]]
Magnets which retain their ability to attract other magnetic materials and do not require electricity to function are called?
Permanent magnets.
___________ is a name given to any material that acts like iron in a magnetic field.
Ferromagnetic.
These lines of force, called ____ lines exist around any conductor that is carrying current and are concentrated around poles of the magnet.
Flux.
The ease with which a material accepts magnetic lines of force is called it’s __________.
Permeability.
Negative is considered to be low pressure or __________.
Low potential.
Positive is considered to be high pressure or __________.
High potential.
The ease with which metal allows current to flow is called __________.
Conductance.
The opposition a material offers to the flow of electrical charges is called ________.
Resistance.
____ is used to describe the amount of power delivered from the source.
Load.
A ____ is defined as the electrical force required to produce 1 ampere of current in 1 ohm of resistance.
Volt.
One ______ of electrical current is defined as the movement of 1 coulomb of electrons that pass a given point of measurement in one second.
Ampere.
The ___ is defined as the resistance a material offers to 1 ampere when 1 volt of electrical potential is present across the material.
Ohm.
The current is equal to the voltage divided by the resistance is the definition of?
Ohm’s law.
The type of one-path electrical circuit where exactly the same amount of current flows through ever part of the circuit is known as?
A series circuit.
The type of multiple-path electrical circuit where there are one or more points where the current divides and follows different paths is known as?
A parallel circuit.
What should the tempurature difference between the hot and cold junction of a thermocouple be?
At least 400°F (204°C).
The ends of the ____ junction become the leads to the safety shut-off valve or switch.
Cold.
Commonly, thermocouples are ______ long, but models are made as long as __ in”.
18, 24 and 36 inches / 60 inches.
Most modern thermopiles have ____ thermocouples connected in series.
10 to 30.
A safety shut-off can only be used where there is a ____________________________________________.
Constant pilot supervised by a thermocouple or thermopile.
Aquastats with fixed differentials have a _____ tempurature differential. Those with adjustable differential can be adjusted between __ and __.
2-°5°F (1-3°C) 5°F and 30°F (3-17°C).
What are the three basic types of operating aquastats?
Remote bulb.
Surface mounted.
Direct mounted with horizontal probe.
What are the two types of circuit breakers?
Magnetic and Thermal.
The _____ is powered by the control module and is capable of producing an electric spark.
Igniter.
The _________ is connected to the control module and detects the prescence or absence of a flame.
Flame sensor.
The typical flame rod is usually made from ______ or _____.
Globar or Kanthol.
The _______ measures the current flowing through the circuit.
Ammeter.
________ are used to measure a difference in potential between two points.
Voltmeters.
_________ measure resistance.
Ohmmeters.
A ___________ has an open circuit output of ___ and can only be used to power a pilotstat device in a combustion safety circuit.
Thermocouple / 30 mV.
