R-12 has the __________ freezing point. lowest highest

CuriousTab

CuriousTab

Home Aptitude

Discussion

Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments

Question
R-12 has the __________ freezing point.
Options
A. lowest
B. highest

Correct Answer

lowest

Heat Transfer, Refrigeration and Air Conditioning problems

Search Results

1. The process of undercooling is generally brought about by
Options
A. circulating more quantity of cooling water through the condenser
B. using water colder than the main circulating water
C. employing a heat exchanger
D. any one of the above

2. In a pressure enthalpy chart, the space to the left of the saturated liquid line represents
Options
A. wet vapour region
B. superheated vapour region
C. sub-cooled liquid region
D. none of these

4. In which of the following refrigeration system, waste heat can be effectively used?
Options
A. Vapour compression cycle
B. Vapour absorption cycle
C. Air refrigeration cycle
D. none of these

5. Which of the following statement is wrong?
Options
A. The performance of the vapour compression refrigerator varies considerably with both vaporising and condensing temperatures.
B. In vapour compression cycle, the useful part of the heat transfer is at the condenser.
C. In ammonia-hydrogen (electolux) refrigerator, no compressor, pump or fan is required.
D. The effect of under-cooling the liquid refrigerant is to decrease the coefficient of performance.

6. The temperature of air recorded by a thermometer, when it is not effected by the moisture present in the air, is called
Options
A. wet bulb temperature
B. dry bulb temperature
C. dew point temperature
D. none of these

Comments

More in Mechanical Engineering: