Refrigerators — MCQ Practice

A refrigerator extracts $2000,\text{J}$ of heat from the cold reservoir in one cycle. If the coefficient of performance (COP) of the refrigerator is 4, what is the work done on the working substance in each cycle?

An ideal refrigerator operates between the temperatures of $27^circ\text{C}$ and $-13^circ\text{C}$. What is its coefficient of performance (COP)?

Which of the following statements is TRUE regarding a refrigerator?

A refrigerator rejects $3000,\text{J}$ of heat to the surroundings for every $1000,\text{J}$ of work done on it. What is the heat extracted from the cold reservoir?

An ideal refrigerator has a COP of 5. If it rejects $1200,\text{J}$ of heat to the hot reservoir in one cycle, what is the temperature of the cold reservoir if the hot reservoir is at $27^circ\text{C}$?

Which component of a refrigerator is responsible for increasing the pressure and temperature of the refrigerant vapor?