MECHANICAL AND ELECTRICAL FINAL QUESTIONS AND ANSWERS | EXAM PREP & PRACTICE
TEST 2026/2027
When using ohms law in a three phase system the law changes slightly. What is Ohms Law for a
three phase system? - correct answer ✔✔E=IR times (square root of 3)
Total pressure equals: - correct answer ✔✔Static Pressure plus Velocity pressure
Another name for the mechanical or vapor compression cycle is the Absorption Refrigeration
cycle - correct answer ✔✔False
A package terminal air conditioning unit has an inside unit (evaporator) and an outside unit
(condenser) - correct answer ✔✔False
When fluid enters the eye of a pump the pressure drops. The lower pressure may cause the
entrained air (vapor) to flash. This is called cavitation - correct answer ✔✔True
Degrees Rankin uses absolute 0 as the scale starting point. To correct degrees Fahrenheit (F) to
degrees Rankin (R) what is the addition factor? - correct answer ✔✔Degrees F + 460 = Degrees
R
Given a Pump efficiency of 78% and a water horsepower of 9.5 whp, calculate the brake
horsepower - correct answer ✔✔
Two loads are in parallel, R1=20 and R2=30, what is the equivalent ohm value? - correct answer
✔✔12 ohms
VAV is the acronym for: Variable air volume - correct answer ✔✔True
, What frequency is used in U.S. electrical systems? - correct answer ✔✔60 hertz
A water hammer arrestor absorbs the shock wave caused by a quick shut-off device in a water
system - correct answer ✔✔True
Only non-grounded power tools and equipment need to be plugged into a ground fault circuit
interrupter - correct answer ✔✔False
Commissioning is LEED requirement - correct answer ✔✔true
An HVAC zone is the area controlled by a thermostat - correct answer ✔✔True
Force draft ventilation provides positive pressure to the boiler combustion chamber - correct
answer ✔✔True
When equipment is de-energized for maintenance and repair always use Lock out tase out
(LOTO) procedures to prevent someone from inadvertently re-energizing the equipment -
correct answer ✔✔True
The refrigeration process most often used in HVAC systems is called the vapor compression
cycle - correct answer ✔✔True
What is the purpose of a GFCI? - correct answer ✔✔
The advantage of AC over DC is its ability to be transformed - correct answer ✔✔True
A 12 volt circuit has two resistance in series. The first is 12 ohms and the other is 9 ohms. What
is the total current in the circuit? - correct answer ✔✔0.57
TEST 2026/2027
When using ohms law in a three phase system the law changes slightly. What is Ohms Law for a
three phase system? - correct answer ✔✔E=IR times (square root of 3)
Total pressure equals: - correct answer ✔✔Static Pressure plus Velocity pressure
Another name for the mechanical or vapor compression cycle is the Absorption Refrigeration
cycle - correct answer ✔✔False
A package terminal air conditioning unit has an inside unit (evaporator) and an outside unit
(condenser) - correct answer ✔✔False
When fluid enters the eye of a pump the pressure drops. The lower pressure may cause the
entrained air (vapor) to flash. This is called cavitation - correct answer ✔✔True
Degrees Rankin uses absolute 0 as the scale starting point. To correct degrees Fahrenheit (F) to
degrees Rankin (R) what is the addition factor? - correct answer ✔✔Degrees F + 460 = Degrees
R
Given a Pump efficiency of 78% and a water horsepower of 9.5 whp, calculate the brake
horsepower - correct answer ✔✔
Two loads are in parallel, R1=20 and R2=30, what is the equivalent ohm value? - correct answer
✔✔12 ohms
VAV is the acronym for: Variable air volume - correct answer ✔✔True
, What frequency is used in U.S. electrical systems? - correct answer ✔✔60 hertz
A water hammer arrestor absorbs the shock wave caused by a quick shut-off device in a water
system - correct answer ✔✔True
Only non-grounded power tools and equipment need to be plugged into a ground fault circuit
interrupter - correct answer ✔✔False
Commissioning is LEED requirement - correct answer ✔✔true
An HVAC zone is the area controlled by a thermostat - correct answer ✔✔True
Force draft ventilation provides positive pressure to the boiler combustion chamber - correct
answer ✔✔True
When equipment is de-energized for maintenance and repair always use Lock out tase out
(LOTO) procedures to prevent someone from inadvertently re-energizing the equipment -
correct answer ✔✔True
The refrigeration process most often used in HVAC systems is called the vapor compression
cycle - correct answer ✔✔True
What is the purpose of a GFCI? - correct answer ✔✔
The advantage of AC over DC is its ability to be transformed - correct answer ✔✔True
A 12 volt circuit has two resistance in series. The first is 12 ohms and the other is 9 ohms. What
is the total current in the circuit? - correct answer ✔✔0.57
