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YAZID YAZID
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7 years ago
A mechanical seal that is actually two seals, with one inner seal designed to handle full system pressure, and
  one outer seal that serves as a backup if the inner seal fails, is known as a _____ seal.
 
  a. single inside
  b. face-to-face
  c. back-to-back
  d. tandem

 Q. 2

Which type of burner port should be used for maximum efficiency?
 
  A) drilled port B) ribbon C) in-shot D) slotted
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ghdfharfgghdfharfg
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7 years ago
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YAZID Author
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7 years ago
Great answers, all of them were right
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