What type of compressors are most commonly used in rooftop packaged units?
A) Hermetic rotary and hermetic centrifugal compressors
B) Hermetic reciprocating or hermetic scroll compressors
C) Open type centrifugal and open type screw compressors
D) Semi-hermetic scroll or semi-hermetic rotary compressors
B
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Since the overload unit must be sensitive to motor current, the heater of the overload relay is connected ____.
a. above the motor b. in parallel with the motor c. below the motor d. in series with the motor
The automatic switchover between compression heat and fossil-fuel heat in a dual-fuel heat pump application is done by a(n) _____.
a. reversing valve b. room thermostat c. furnace control board d. outdoor thermostat
Which type of vitamin is made in the animal's body after exposure to ultraviolet (UV) rays from the sun?
A) D B) K C) E D) B
Quail and pheasant are grown for restaurants and gourmet food markets, as well as wildlife areas.
Answer the following statement true (T) or false (F)