Concrete that has hardened but not yet gained structural strength, is referred to as _____.

Concrete that has hardened but not yet gained structural strength, is referred to as _____.
 
  a. raw
  b. green
  c. uncured
  d. unstable

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[Ques. 2]

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[Ques. 3] The purpose of a condenser heat recovery system is to _____.
 
  a. precool air entering the evaporator
  b. extract heat from the refrigerant before it enters the condenser
  c. capture heat that is rejected by the condenser
  d. store heat for later distribution by the air handling unit

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[Ques. 4] A refrigeration system in which the hot discharge gas from the compressor can be diverted from the system
  condenser and into a heat recovery condenser is commonly called a _____.
 
  a. dual-condenser system
  b. double-bundle condenser system
  c. heat pump heat reclaim system
  d. bypass condenser system

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[Ques. 5] Which of the following refrigerant oils is glycol-based?
 
  a. Alkylbenzene
  b. POE
  c. PAG
  d. PVE