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michaelmorris17 michaelmorris17
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6 years ago
What type of vent is used with 80 percent Category I furnaces?
 
  A) Type B double-wall gas vent
  B) 90 percent efficiency furnaces do not require a vent.
  C) PVC
  D) Single-wall stainless steel


[Ques. 2] What is the RPM of a fan that uses a 4 in motor pulley, 8 in fan pulley, and a motor RPM of 1,750?
 
  A) 1,250 B) 875 C) 750 D) 500


[Ques. 3] In order to double fan RPM, the motor horsepower:
 
  A) Will not be affected by the fan RPM. B) Must also double.
  C) Must increase by a factor of 8 (2  2  2). D) Must increase by a factor of 4 (2  2).


[Ques. 4] Which type of system reduces the total amount of refrigerant charge required?
 
  A) Multiplex B) Distributed C) Direct-expansion D) Secondary-loop


[Ques. 5] The rack-type system is the most common configuration for which type of system?
 
  A) Distributed B) Secondary-loop C) Multiplex D) Direct-expansion
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pattiegalvezpattiegalvez
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6 years ago
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6 years ago
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