Furnaces are used to:

a. increase the temperature of a fluid
b. release harmful gases to the environment
c. decrease temperature and pressure
d. decrease the viscosity of a fluid


a. Correct. A furnace, also referred to as a process heater, is an apparatus in which heat is released by burning fuel and is transferred directly or indirectly to a fluid mass for the purpose of increasing the temperature of fluids flowing through tubes.
b. Incorrect. A furnace, also referred to as a process heater, is an apparatus in which heat is released by burning fuel and is transferred directly or indirectly to a fluid mass for the purpose of increasing the temperature of fluids flowing through tubes.
c. Incorrect. A furnace, also referred to as a process heater, is an apparatus in which heat is released by burning fuel and is transferred directly or indirectly to a fluid mass for the purpose of increasing the temperature of fluids flowing through tubes.
d. Incorrect. A furnace, also referred to as a process heater, is an apparatus in which heat is released by burning fuel and is transferred directly or indirectly to a fluid mass for the purpose of increasing the temperature of fluids flowing through tubes.

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