Previous Year NEET Question- Heat Engine & Refrigerators

2019:

The efficiency of a Carnot engine is given by the equation:

η = 1 - (T2 / T1)

where:

• η is the efficiency of the engine
• T1 is the temperature of the hot reservoir
• T2 is the temperature of the cold reservoir

In this problem, we have:

• T1 = 600 K
• T2 = 400 K

So, the efficiency of the engine is:

η = 1 - (400 K / 600 K) = 0.333 = 33.3%

2018:

The coefficient of performance of a refrigerator is given by the equation:

COP = 1 - (T2 / T1)

where:

• COP is the coefficient of performance
• T2 is the temperature inside the refrigerator
• T1 is the temperature outside the refrigerator

In this problem, we have:

• COP = 5
• T2 = 273 K