For the control volume shown, the pump power is 4 Watts, with a heat transfer of
ID: 1710677 • Letter: F
Question
For the control volume shown, the pump power is 4 Watts, with a heat transfer of 6 Watts from the fluid in the pump to the surroundings. Using the sign conventions from class, the rate of energy transfer to the fluid is: a) -2 Watts b) 10 Watts c) 2 Watts d)-10 Watts B. Which of the following assumptions must hold for the Bernoulli equation to to be applied: I. Unsteady flow. II. Inviscid flow. III. Compressible Flow. IV. Flow where heat and work transfer rates arc zero. a) I, II, and II b) II, III, and IV c) I and III d) II and IVExplanation / Answer
given pump power = 4 watts
heat transfer from the fluid in the pipe to the sorroundings = 6 watts
rate of energy transfered to fluid = pump power - heat transffered from the fluid in pipe to sorrounding
=4-6
=- 2 watts
option a is the right answer
assumptions of bernoulis equation:
1. steady flow
2. valid for incompressible flow
3.invicid flow
4. no friction
as by simply seeing those options by comparing above
option d is the correct answer