Heat Transfer

Question: Which of the following refrigerant is highly toxic and flammable? [A]. Ammonia [B]. Carbon dioxide [C]. Sulphur dioxide [D]. R-12 Answer: Option A Explanation: No answer description available for this question.

Question: Which of the following refrigerant has the highest freezing point. [A]. Ammonia [B]. Carbon dioxide [C]. Sulphur dioxide [D]. R-12 Answer: Option B Explanation: No answer description available for this question.

Question: Which of the following refrigerant has the lowest boiling point? [A]. Ammonia [B]. Carbon dioxide [C]. Sulphur dioxide [D]. R-12 Answer: Option B Explanation: No answer description available for this question.

Question: The boiling point of R-12 is about – 30°C. [A]. True [B]. False Answer: Option A Explanation: No answer description available for this question.

Question: The boiling point of __________ is -10.5°C. [A]. ammonia [B]. R-12 [C]. sulphur dioxide [D]. carbon dioxide Answer: Option C Explanation: No answer description available for this question.

Question: The boiling point of carbon dioxide is [A]. -20.5°C [B]. -50°C [C]. -63.3°C [D]. -78.3°C Answer: Option D Explanation: No answer description available for this question.

Question: The boiling point of ammonia is [A]. -10.5°C [B]. -30°C [C]. -33.3°C [D]. -77.7°C Answer: Option C Explanation: No answer description available for this question.

Question: Which of the following statement is correct for ammonia as a refrigerant? [A]. It is toxic to mucous membranes. [B]. it requires large displacement per TR compared to fluoro carbons. [C]. It reacts with copper and its alloys. [D]. all of these Answer: Option D Explanation: No answer description available for this question.

Question: A refrigerant with the highest critical pressure is [A]. R-11 [B]. R-12 [C]. R-22 [D]. Ammonia Answer: Option D Explanation: No answer description available for this question.

Question: Which of the following refrigerant has the lowest freezing point? [A]. R-11 [B]. R-12 [C]. R-22 [D]. Ammonia Answer: Option C Explanation: No answer description available for this question.