MECHANICAL AND ELECTRICAL SYSTEMS EXAM 3 QUESTIONS AND ANSWERS | EXAM PREP &
PRACTICE TEST 2026/2027
When the pressure in the system exceeds about 30 psi, a spring-loaded temperature/pressure
relief valve opens, permitting some of the water to bleed out of the system, which allows the
pressure to drop - correct answer ✔✔what is a safety relief valve
four common: series loop, one piper, two pipe, radiant arrangements
usually copper, sometimes steel or thermoplastic, - correct answer ✔✔hot water systems
Radiant heating in the floor slab requires that the tubing be installed before the slab is placed. -
correct answer ✔✔radiant heating systems t/f
three pipe and four pipe - correct answer ✔✔which is not a piping arrangements commonly
used in residential and commercial
he expansion tank in a hydronic system allows for the expansion of the water in the system as it
is heated.
connected to water supply
must have means to eliminate air
Common terminal units for heating used in hydronic systems are convection heaters, baseboard
convectors, convector radiators, radiators, fan-coil units, and unit ventilators. - correct answer
✔✔what is a hydronic system in hvac
controls air temp in the space
one thermostat for each zone - correct answer ✔✔what does a thermostat do in a hydronic
system
, circulator or circulating pump - correct answer ✔✔in a hydronic system hot water is from the
boiler to the pipers back to the boilers by what
Series loop One-pipe Two-pipe Radiant arrangements - correct answer ✔✔which of these is not
a piping arrangement in commercial buildings that involve both heating and cooling
passive - correct answer ✔✔_________ solar heating is integrated in the building elements and
materials
is a radiant energy source that causes natural processes such as photosynthesis, thermal
heating, and wind. - correct answer ✔✔what is solar energy
use a small amount of conventional energy to control dampers, shutters, night insulation, and
other devices that enhance solar energy collection, storage, and use, and reduce undesirable
heat loss.
The goal of all passive solar heating systems is to capture solar energy within the building
envelope and naturally release that heat during periods when the sun is not shining
does not use auxiliary energy - correct answer ✔✔a passive solar system works how
true - correct answer ✔✔solar energy avaible on earth can be affected by several things t/f
angle of incidence - correct answer ✔✔solar radiation travels in a straight line, the angle
created by incoming radiation intercepting surfaces is called the what
active, passive, photvoltaic - correct answer ✔✔there are three basic solar systems used in
buildings
true - correct answer ✔✔solar systems can be used in buildings t/f
PRACTICE TEST 2026/2027
When the pressure in the system exceeds about 30 psi, a spring-loaded temperature/pressure
relief valve opens, permitting some of the water to bleed out of the system, which allows the
pressure to drop - correct answer ✔✔what is a safety relief valve
four common: series loop, one piper, two pipe, radiant arrangements
usually copper, sometimes steel or thermoplastic, - correct answer ✔✔hot water systems
Radiant heating in the floor slab requires that the tubing be installed before the slab is placed. -
correct answer ✔✔radiant heating systems t/f
three pipe and four pipe - correct answer ✔✔which is not a piping arrangements commonly
used in residential and commercial
he expansion tank in a hydronic system allows for the expansion of the water in the system as it
is heated.
connected to water supply
must have means to eliminate air
Common terminal units for heating used in hydronic systems are convection heaters, baseboard
convectors, convector radiators, radiators, fan-coil units, and unit ventilators. - correct answer
✔✔what is a hydronic system in hvac
controls air temp in the space
one thermostat for each zone - correct answer ✔✔what does a thermostat do in a hydronic
system
, circulator or circulating pump - correct answer ✔✔in a hydronic system hot water is from the
boiler to the pipers back to the boilers by what
Series loop One-pipe Two-pipe Radiant arrangements - correct answer ✔✔which of these is not
a piping arrangement in commercial buildings that involve both heating and cooling
passive - correct answer ✔✔_________ solar heating is integrated in the building elements and
materials
is a radiant energy source that causes natural processes such as photosynthesis, thermal
heating, and wind. - correct answer ✔✔what is solar energy
use a small amount of conventional energy to control dampers, shutters, night insulation, and
other devices that enhance solar energy collection, storage, and use, and reduce undesirable
heat loss.
The goal of all passive solar heating systems is to capture solar energy within the building
envelope and naturally release that heat during periods when the sun is not shining
does not use auxiliary energy - correct answer ✔✔a passive solar system works how
true - correct answer ✔✔solar energy avaible on earth can be affected by several things t/f
angle of incidence - correct answer ✔✔solar radiation travels in a straight line, the angle
created by incoming radiation intercepting surfaces is called the what
active, passive, photvoltaic - correct answer ✔✔there are three basic solar systems used in
buildings
true - correct answer ✔✔solar systems can be used in buildings t/f
