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COSC 325 Mechanical and Electrical Systems
Examination, University of Houston||Verified Exam!!||,
2026/2027 -Question Construction Science
Examination with Verified Solutions
What does a Transformer do? - Answer-Uses
electromagnetism to step down the voltage to a lower
voltage that the building can use and steps up amps.
If amps drive wire size, then is Primary or Secondary
bigger? - Answer-Secondary
What does a System Ground do? - Answer-Protects the
service entrance wiring and connections from lightning
and high voltage surges.
What is a Fuse? - Answer-an electric overcurrent
protection device used to limit the rate of current flow in a
circuit.
What is a Circuit Breaker? - Answer-An overcurrent
protection device with a mechanical mechanism that may
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manually or automatically open a circuit when an overload
condition or short circuit occurs.
What is the most common type of Circuit Breaker? -
Answer-Thermal-Magnetic Circuit Breaker
What is the maximum height at which a circuit breaker
handle can be installed? - Answer-6' - 7"
What is the most popular overcurrent device? - Answer-
Fuses
What is a GFCI? - Answer-A fast-acting receptacle that
detects low levels of leakage current to ground and opens
the circuit in response to the leakage.
Where is a GFCI typically installed? - Answer-Indoors:
Standard receptacle boxes
Outdoor: Weatherproof boxes
What is the smallest current leakage a GFCI can detect? -
Answer-.005A
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Purpose of LOTO - Answer-Stop the electrical flow
upstream of the electrical current.
What does NFPA 70E state? - Answer-The requirements
for maximum safety for personal protective equipment.
What kind of voltage reverses its direction of flow at
regular intervals and is the most common type of voltage
used to produce work? - Answer-Alternating Voltage (AC)
What is current measured in? - Answer-Amps
What is the common electrical service amperage for
Residential? - Answer-~200A
What is the common electrical service amperage for
Commercial? - Answer-400A+
Electrical Energy Calculation formula - Answer-E = P x T
Power formula - Answer-P = E x I
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What is a closed circuit? - Answer-An electrical circuit that
is complete and has current flowing from the power source
to the load and back to the power source.
What is an example of an Automatically Controlled Circuit?
- Answer-Sump Pump
How many control locations does a three-way switch
have? - Answer-2
How many control locations does a four-way switch have?
- Answer-3
What is the function of a Receptacle? - Answer-To supply
current to portable electrical equipment.
What is Ground Fault? - Answer-Any current above the
level that is required for a dangerous shock.
COSC 325 Mechanical and Electrical Systems
Examination, University of Houston||Verified Exam!!||,
2026/2027 -Question Construction Science
Examination with Verified Solutions
What does a Transformer do? - Answer-Uses
electromagnetism to step down the voltage to a lower
voltage that the building can use and steps up amps.
If amps drive wire size, then is Primary or Secondary
bigger? - Answer-Secondary
What does a System Ground do? - Answer-Protects the
service entrance wiring and connections from lightning
and high voltage surges.
What is a Fuse? - Answer-an electric overcurrent
protection device used to limit the rate of current flow in a
circuit.
What is a Circuit Breaker? - Answer-An overcurrent
protection device with a mechanical mechanism that may
,2|Page
manually or automatically open a circuit when an overload
condition or short circuit occurs.
What is the most common type of Circuit Breaker? -
Answer-Thermal-Magnetic Circuit Breaker
What is the maximum height at which a circuit breaker
handle can be installed? - Answer-6' - 7"
What is the most popular overcurrent device? - Answer-
Fuses
What is a GFCI? - Answer-A fast-acting receptacle that
detects low levels of leakage current to ground and opens
the circuit in response to the leakage.
Where is a GFCI typically installed? - Answer-Indoors:
Standard receptacle boxes
Outdoor: Weatherproof boxes
What is the smallest current leakage a GFCI can detect? -
Answer-.005A
,3|Page
Purpose of LOTO - Answer-Stop the electrical flow
upstream of the electrical current.
What does NFPA 70E state? - Answer-The requirements
for maximum safety for personal protective equipment.
What kind of voltage reverses its direction of flow at
regular intervals and is the most common type of voltage
used to produce work? - Answer-Alternating Voltage (AC)
What is current measured in? - Answer-Amps
What is the common electrical service amperage for
Residential? - Answer-~200A
What is the common electrical service amperage for
Commercial? - Answer-400A+
Electrical Energy Calculation formula - Answer-E = P x T
Power formula - Answer-P = E x I
, 4|Page
What is a closed circuit? - Answer-An electrical circuit that
is complete and has current flowing from the power source
to the load and back to the power source.
What is an example of an Automatically Controlled Circuit?
- Answer-Sump Pump
How many control locations does a three-way switch
have? - Answer-2
How many control locations does a four-way switch have?
- Answer-3
What is the function of a Receptacle? - Answer-To supply
current to portable electrical equipment.
What is Ground Fault? - Answer-Any current above the
level that is required for a dangerous shock.
