MECHANICAL AND ELECTRICAL EXAM 2 QUESTIONS AND ANSWERS | EXAM PREP & PRACTICE
TEST 2026/2027
Heat gain is the amount of heat that a building or building space accumulates from external
sources (e.g., high outside temperature and solar radiation) and internal sources (e.g.,
occupants, lights, equipment, and appliances). - ANS ✔✔Heat gain in building
The ________________ is the heat the HVAC equipment must remove to maintain the building
interior at inside design conditions. - ANS ✔✔Cooling Load
Heat that enters a building or that is generated in a building interior can affect the cooling load
instantly or may be temporarily stored in materials or furnishings and released to affect the
cooling load at a later time. - ANS ✔✔Heat gain
________________ are made to size an HVAC cooling system and its components based upon
the effects of heat gains and building performance at extreme conditions, usually midday during
the summer. - ANS ✔✔Cooling Load Computation
T/F An installation of multiple small boilers is typically more efficient and effective than an
installation of a single large boiler. - ANS ✔✔True
A ___________ is normally more efficient than a comparable large boiler. - ANS ✔✔Small Boiler
T/F A boiler is most efficient when it operates at or near its rated capacity. - ANS ✔✔True
A ___________________ is a DX refrigeration cooling system. - ANS ✔✔Central Air Conditioner
What is the four basic parts of a Central Air Conditioner? - ANS ✔✔a condensing unit
(containing the compressor, condenser, and expansion valve)
, a cooling coil (an evaporator in the air-handling unit or ductwork near the furnace)
ductwork (to distribute the cooled air)
control mechanism such as a thermostat.
The most common type of central air conditioner is a ______________ - ANS ✔✔Split System
A ________________ has the condensing unit (containing the compressor, condensing coil and
fan, and expansion valve) located outside and a cooling coil (an evaporator in an air-handling
unit or in the ductwork near the furnace) located inside. - ANS ✔✔Split System
_____________consist of a hot surface that radiates heat energy in a specific direction. In large
space heating designs, adjustable reflectors that are part of the heating unit control distribution
patterns. - ANS ✔✔Infrared heaters
____________ warms floors and other objects in the space. - ANS ✔✔Radiated Energy
T/F Little energy is lost because air is a poor absorber. - ANS ✔✔True
Heat is released from these objects by ____________ - ANS ✔✔Convection
______ is mixed with water vapor, in proportions that vary with climate, season, and daily
weather conditions. - ANS ✔✔Air
T/F Low humidity levels result in the generation of static electricity, which is damaging to
electronic equipment. - ANS ✔✔True
At relative humidity levels below _______, these problems increase drastically. - ANS ✔✔20%
TEST 2026/2027
Heat gain is the amount of heat that a building or building space accumulates from external
sources (e.g., high outside temperature and solar radiation) and internal sources (e.g.,
occupants, lights, equipment, and appliances). - ANS ✔✔Heat gain in building
The ________________ is the heat the HVAC equipment must remove to maintain the building
interior at inside design conditions. - ANS ✔✔Cooling Load
Heat that enters a building or that is generated in a building interior can affect the cooling load
instantly or may be temporarily stored in materials or furnishings and released to affect the
cooling load at a later time. - ANS ✔✔Heat gain
________________ are made to size an HVAC cooling system and its components based upon
the effects of heat gains and building performance at extreme conditions, usually midday during
the summer. - ANS ✔✔Cooling Load Computation
T/F An installation of multiple small boilers is typically more efficient and effective than an
installation of a single large boiler. - ANS ✔✔True
A ___________ is normally more efficient than a comparable large boiler. - ANS ✔✔Small Boiler
T/F A boiler is most efficient when it operates at or near its rated capacity. - ANS ✔✔True
A ___________________ is a DX refrigeration cooling system. - ANS ✔✔Central Air Conditioner
What is the four basic parts of a Central Air Conditioner? - ANS ✔✔a condensing unit
(containing the compressor, condenser, and expansion valve)
, a cooling coil (an evaporator in the air-handling unit or ductwork near the furnace)
ductwork (to distribute the cooled air)
control mechanism such as a thermostat.
The most common type of central air conditioner is a ______________ - ANS ✔✔Split System
A ________________ has the condensing unit (containing the compressor, condensing coil and
fan, and expansion valve) located outside and a cooling coil (an evaporator in an air-handling
unit or in the ductwork near the furnace) located inside. - ANS ✔✔Split System
_____________consist of a hot surface that radiates heat energy in a specific direction. In large
space heating designs, adjustable reflectors that are part of the heating unit control distribution
patterns. - ANS ✔✔Infrared heaters
____________ warms floors and other objects in the space. - ANS ✔✔Radiated Energy
T/F Little energy is lost because air is a poor absorber. - ANS ✔✔True
Heat is released from these objects by ____________ - ANS ✔✔Convection
______ is mixed with water vapor, in proportions that vary with climate, season, and daily
weather conditions. - ANS ✔✔Air
T/F Low humidity levels result in the generation of static electricity, which is damaging to
electronic equipment. - ANS ✔✔True
At relative humidity levels below _______, these problems increase drastically. - ANS ✔✔20%
