Page 1 - Worksheet-3 thermodynamics
P. 1

Worksheet-3

               Thermodynamics


               1    The coefficient performance of a refrigerator is 5. If the temperature inside the freezer is -20℃,
                    calculate the heat rejected to the surrounding
                    (a) 11℃
                    (b) 41℃
                    (c) 21℃
                    (d) 31℃
               2    A heat engine: A) converts heat input to an equivalent amount of work
                    B) converts work to an equivalent amount of heat C) takes heat in, does
                    work, and loses energy heat D) uses positive work done on the system
                    to transfer heat from a low temperature reservoir to a high temperature
                    reservoir E) uses positive work done on the system to transfer heat from
                    a high temperature reservoir to a low temperature reservoir
               3    A heat engine that in each cycle does positive work and loses energy as
                    heat, with no heat energy input, would violate: A) the zeroth law of
                    thermodynamics B) the first law of thermodynamics C) the second
                    law of thermodynamics D) the third law of thermodynamics
                    E) Newton's second law
               4    A Heat engine operates between 200°C and 20°C. Its maximum possible
                    efficiency is: A) 90% B) 100% C) 38% D) 72% E) 24%
               5    A geyser heats water flowing at the rate of 3.0 litres per minute from 2 7°C to 77°C. If the geyser
                    operates on a gas burner, what is the rate of consumption of the fuel if its heat of combustion is
                    4.0 x 104 J/g?
               6



               7







               8





               9




               10
   1