Page 1 of 53
HVAC/R (Heating, Ventilation, Air Conditioning,
and Refrigeration) Systems, Commercial
Building Controls, and Basic Electrical
Principles.
Download now
Johns Hopkins University
HIGH YIELDS QUESTIONS
NEWEST MODEL 2026 EXAM LATEST
VERSION SOLVED QUESTIONS &
ANSWERS VERIFIED 100 %
Exam
, Page 2 of 53
UA Star Exam 140
1. If not properly installed a hot gas muffler might trap
A. Hot
B. Superheated vapor C.
Suction gas
D. Oil
D. Oil
2. Unit ventilators are usually equipped with outside air dampers :
A. Provide ventilation air during building occupancy
B. Comply with most local or state codes
C. Provide free cooling in winter months
D. Both A and B are correct
D. Both A and B are correct
3. Copper plating of compressor parts parts
A. Done at the factory to prevent rusting
B. Caused by contaminants in the system
C unlikely to happen unless the motor has grounded
D prevented by adding ethanol to the system
B. Caused by contaminants in the system
4. Face and bypass dampers should be adjusted to provide
A. A mixture of heated or cooled air at all times
B. Tight shut off to reduce the possibility of overcooling or overheating
C the proper air volume at all load conditions
D a uniform air flow rate at low loads
B Tight shut off to reduce the possibility of overcooling or overheating
, Page 3 of 53
5. With belt driven equipment, alignment of the motor and driven equipment
pulleys
A. Is not critical since the belts are flexible Misaligned pulleys will cause
excessive wear on belts , pulleys and bearings
B. accomplished using a string or straight edge
C. accomplished when the belts are parallel to one another
D. accomplished using dial indicator
B. accomplished using a string or straight edge
6. To assist consumers in making an informed choice when purchasing unitary
air conditioning equipment the efficiency of such units is expressed as Energy
Efficiency Ratio ( EER or SEER the units of which are
A. Btuh / ampere
B. Btuh volt
C. Btuh / watt
D. Btuh / Hp
C. Btuh/watt
7. Fire stats located in the air stream of air handling units
A. Are required in both the supply and return air streams
B. Should be the manual reset type
C. Should be nonadjustable
D. All of the above
D. All of the above
8. Sleeve bearing would typically be used in motor that :
A. Operates with a light load and where noise factor
B. Operates with heavy load and where noise is not a factor
C. Operates with a heavy load a dirty atmosphere
D. Operates with a heavy load in moist atmosphere
A. Operates with a light load and where noise is factor
9. A bearing used on bottom of a motor where the shaft positioned vertically is
called bearing
A. Sleeve
B. Ball
C. Thrust
D. Bronze
, Page 4 of 53
C. Thrust
10. To produce electromagnetism relative motion is required between a
magnetic field and a an :
A. Switch
B. Conductor
C. Element
D. Ground
E. Insulator
B. Conductor
11. Materials which do not allow their electrons spin out of orbit easily are
called
A. Conductors
B. Grounds
C. Insulators
D. Elements
E. Magnets
C. Insulators
12. Current flowing through conductor in one direction for split second then in
the opposite direction for a split second a good definition : Current flowing
through conductor in one direction for split second then in the opposite
direction for a split second a good definition :
A. Alternating current
B. Direct current
C. Voltage
D. Resistance
E. Wattage
A. Alternating current
13. a pressure gauge reads five psig at sea level elevation the corresponding
absolute pressure
A. 14.7 psig
B. 14.17 psia
C. 19.7 psia
D. 19.7 psig
C. 19.7 psia
HVAC/R (Heating, Ventilation, Air Conditioning,
and Refrigeration) Systems, Commercial
Building Controls, and Basic Electrical
Principles.
Download now
Johns Hopkins University
HIGH YIELDS QUESTIONS
NEWEST MODEL 2026 EXAM LATEST
VERSION SOLVED QUESTIONS &
ANSWERS VERIFIED 100 %
Exam
, Page 2 of 53
UA Star Exam 140
1. If not properly installed a hot gas muffler might trap
A. Hot
B. Superheated vapor C.
Suction gas
D. Oil
D. Oil
2. Unit ventilators are usually equipped with outside air dampers :
A. Provide ventilation air during building occupancy
B. Comply with most local or state codes
C. Provide free cooling in winter months
D. Both A and B are correct
D. Both A and B are correct
3. Copper plating of compressor parts parts
A. Done at the factory to prevent rusting
B. Caused by contaminants in the system
C unlikely to happen unless the motor has grounded
D prevented by adding ethanol to the system
B. Caused by contaminants in the system
4. Face and bypass dampers should be adjusted to provide
A. A mixture of heated or cooled air at all times
B. Tight shut off to reduce the possibility of overcooling or overheating
C the proper air volume at all load conditions
D a uniform air flow rate at low loads
B Tight shut off to reduce the possibility of overcooling or overheating
, Page 3 of 53
5. With belt driven equipment, alignment of the motor and driven equipment
pulleys
A. Is not critical since the belts are flexible Misaligned pulleys will cause
excessive wear on belts , pulleys and bearings
B. accomplished using a string or straight edge
C. accomplished when the belts are parallel to one another
D. accomplished using dial indicator
B. accomplished using a string or straight edge
6. To assist consumers in making an informed choice when purchasing unitary
air conditioning equipment the efficiency of such units is expressed as Energy
Efficiency Ratio ( EER or SEER the units of which are
A. Btuh / ampere
B. Btuh volt
C. Btuh / watt
D. Btuh / Hp
C. Btuh/watt
7. Fire stats located in the air stream of air handling units
A. Are required in both the supply and return air streams
B. Should be the manual reset type
C. Should be nonadjustable
D. All of the above
D. All of the above
8. Sleeve bearing would typically be used in motor that :
A. Operates with a light load and where noise factor
B. Operates with heavy load and where noise is not a factor
C. Operates with a heavy load a dirty atmosphere
D. Operates with a heavy load in moist atmosphere
A. Operates with a light load and where noise is factor
9. A bearing used on bottom of a motor where the shaft positioned vertically is
called bearing
A. Sleeve
B. Ball
C. Thrust
D. Bronze
, Page 4 of 53
C. Thrust
10. To produce electromagnetism relative motion is required between a
magnetic field and a an :
A. Switch
B. Conductor
C. Element
D. Ground
E. Insulator
B. Conductor
11. Materials which do not allow their electrons spin out of orbit easily are
called
A. Conductors
B. Grounds
C. Insulators
D. Elements
E. Magnets
C. Insulators
12. Current flowing through conductor in one direction for split second then in
the opposite direction for a split second a good definition : Current flowing
through conductor in one direction for split second then in the opposite
direction for a split second a good definition :
A. Alternating current
B. Direct current
C. Voltage
D. Resistance
E. Wattage
A. Alternating current
13. a pressure gauge reads five psig at sea level elevation the corresponding
absolute pressure
A. 14.7 psig
B. 14.17 psia
C. 19.7 psia
D. 19.7 psig
C. 19.7 psia
