CBSE Class 11-science - Heat Engines Videos

• Show four steps of carnot engine in P – V graph write the equation of each step and obtain the work done by the system. Also obtain the efficiency of a carnot engine.
• State the conditions which must be fulfilled to utilize heat into useful work.
• Can a room be cooled by leaving the door of an electric refrigerator open?
• Two ideal heat engines A and B have their sources at 600K and 400K and their sinks at 300K and 250K respectively.  Which engine is more efficient?
• Define efficiency of a heat engine.  Also draw the symbolic representation of a heat engine.
• What does a heat engine do? Name two types of heat engines. Give one example of each.
• (a) What is a refrigerator?  Explain its principle by a schematic diagram.  Name the gas commonly used in refrigerators? (b)  In the household refrigerators, name the agency that does the work.  
• Explain the following terms in context with a heat engine: (i)  Hot reservoir (or source) (ii)  Cold reservoir (or sink) (iii)  Working substance (iv)  Mechanical parts
• Refrigerator P works between - 10^oC and 27^oC, while refrigerator Q works between -27^oC and 17^oC. Both of them remove 2000 J heat from the freezer. Which of the two is a better refrigerator?
• In a refrigerator, heat is transferred from inside at 277K to a room at 300K.  How many joules of heat will be delivered to the room for each joule of electric energy consumed ideally?

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