List three differences between safety valves and relief valves.
What will be an ideal response?
Safety valves are intended for use in gas service whereas relief valves are used in liquid service; safety valves have a larger outlet than relief valves, because compressible gases require that a greater amount be released to reduce pressure; and safety valves open fully and quickly when set pressure is exceeded, but relief valves open more slowly and in proportion to the pressure increase.
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La cantidad de gajos de una cabeza está determinada por ____.
a. un cuadro b. la división del diámetro por el ancho del gajo que con mayor facilidad se instale c. la multiplicación del diámetro por pi d. la división de la circunferencia por el ancho del gajo que con mayor facilidad se instale
____________________ is a measurement of the vibrating speed or frequency of the atoms in matter.
Fill in the blank(s) with the appropriate word(s).
What is the total inductance if a 50 mH inductor is connected in series with a 15 mH inductor?
A) 50 mH B) 15 mH C) 65 mH D) 11.5 mH
Which instrument measures the pressure of flue gases in the furnace?
A. draft gauge B. smoke tester C. carbon dioxide tester D. stack thermometer