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Author Question: Calculate the amount of heat required to change 5 pounds of 32 ice to water. A) No extra heat is ... (Read 65 times)

luvbio

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on: Jul 26, 2018
Calculate the amount of heat required to change 5 pounds of 32 ice to water.
 
  A) No extra heat is required because the ice is already at the melting temperature.
  B) 5lbs  32F  0.5 BTU/lb = 80 BTUs
  C) 5 lbs  144 BTUs/lb = 720 BTUs
  D) The amount of heat required cannot be calculated without knowing the ending temperature of the water.

Question 2

Technicians should be careful when brazing lines to evaporator coils that have pre-installed thermostatic expansion valves because the heat from brazing the lines:
 
  A) Can overheat the TEV bulb and destroy the valve.
  B) Alter the chemical makeup of the bulb charge and change its physical properties.
  C) Can weld the sensing bulb to the suction line.
  D) Can catch the refrigerant on fire.


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randomguy133

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Reply #1 on: Jul 26, 2018
Answer to Question 1

C

Answer to Question 2

A


luvbio

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Reply #2 on: Jul 26, 2018
Thank you!


randomguy133

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Reply #3 on: Jul 26, 2018
Always glad to help...


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