MEP SYSTEMS I (COSC 325) ELECTRICAL EXAM –
HOUSTON NEWEST ACTUAL EXAM COMPLETE 250
QUESTIONS AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) |ALREADY GRADED A+
What is the movement of electrons from atom to atom? (20 - 431) - ANSWERElectricity
What is a state of matter that has definite volume and shape? (20-431) - ANSWERSolid
What is a state of matter that has definite volume but not definite shape? (20-431) -
ANSWERLiquid
What is a state of matter that is fluid, has a relatively low density, and is highly
compressible? (20-431) - ANSWERGas
True or False? All matter has electrical properties. (20-431) - ANSWERTrue
What is a material that has very little resistance and permits electrons to move through it
easily?
What is an example of this? (20-431) - ANSWERConductor
Copper, Silver, Gold, Aluminum, Iron
What is a material that has a very high resistance and resists the flow of electrons?
What is an example of this? (20-431) - ANSWERInsulator
Rubber, Glass, Paper, Plastic
What is a negatively charged particle in an atom? (20-431) - ANSWERElectron
What is a neutral particle, with a mass roughly equal to a proton, that exists in the
nucleus of an atom? (20-431) - ANSWERNeutron
What is a positively charged particle that exists in the nucleus of an atom? (20-431) -
ANSWERProton
What in an atom determines its weight and atomic number? (20-431) - ANSWERThe
number of Protons
What is produced when there are fewer electrons than normal? (20-431) -
ANSWERPositive Charge
What is produced when there are more electrons than normal? (20-431) -
ANSWERNegative Charge
, What is the maximum number of shells an atom can have? (20-432) - ANSWERSeven
What is the outermost shell of an atom that contains the electrons that form new
compounds? (20-432) - ANSWERValence Shell
What material is the best conductor? (20-433) - ANSWERSilver
What is an electronic device that has electrical conductibility between that of a conductor
and that of an insulator.
What are examples of these materials? (20-433) - ANSWERSemiconductor
Carbon, Germanium, Silicon
What is an electrical charge at rest? (20-433) - ANSWERStatic Electricity
What is the alternating current (AC) created by power plant generators? (20-433) -
ANSWERGenerated Electricity
Power plant generators create ____ ____ _____ ____ electricity. (20-433) -
ANSWERThree-Phase Alternating Current
What is an electric device that uses electromagnetism to change (step-up or step-down)
AC voltage from one level to another? (20-434) - ANSWERTransformer
What must you do to electricity before it enters a building from the wire? (20-434) -
ANSWERStep-down
What do transformers step electricity down to to service apartments, condos,
townhomes, and homes? (20-434) - ANSWER120 V/ 240 V
What is an electrical device containing fuses or circuit breakers for protecting the
individual circuits of a residence, and serves as means of disconnecting the entire
residence from the distribution system? (20-435) - ANSWERService Panel
Where can Service Panels be found? (20-435) - ANSWERWall-mounted in basements,
utility rooms, and attached garages. Must be easily accessible to residents.
What is a complete path (when ON) for current to take and INCLUDES electrical devices,
circuit protection, conductors, and loads? (20-436) - ANSWERCircuit
What protects occupants by providing a safe pathway for unwanted electricity to enter
the ground? (20-436) - ANSWERGrounding
What are the two levels of grounding? (20-436) - ANSWERSystem Ground
Equipment Ground
What is the primary function of System Grounding? (20-436) - ANSWERTo protect the
service entrance wiring and connections from lightning and high voltage surges.
Why do water pipes work well as grounds? (20-437) - ANSWERBecause a large surface
area of the pipe is in contact with the earth.
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