question_answer

Consider the following statements:

1. Practically all common refrigerants have approximately the same COP and power requirement.

2. Ammonia mixes freely with lubricating oil and this helps lubrication of compressors.

3. Dielectric strength of refrigerants is an important property in hermetically sealed compressor units.

4. Leakage of ammonia can detected by halide torch method.

Of these statements

A) 1, 2, and 4 are correct

B) 2 and 4 are correct

C) 1, 3 and 4 are correct

D) 1 and 3 are correct