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Midterm22006

# Midterm22006 - ENGR 225 Recitation 8:30-9:45 Sears 435...

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ENGR 225 Name ____________________________________ Recitation Midterm 2, October 27, 2004 _____ 8:30-9:45 Sears 435 _____ 10:00-11:15 Sears 435 _____ 1:15-2:30 Bingham 304 _____ 1:15-2:30 Olin 314 Short answer (2 pts. Each, for T/F and multiple choice circle the best answer of the choices given, fill in the blank must be completed with a meaningful word or phrase) 1. T F The total amount of energy in a system can change during a process. 2. For a closed system there are two means by which energy can be transferred into or out of a system, work and _______________. 3. During steady flow a. the mass-flow-rate-in is equal to the mass-flow-rate-out b. the system energy is constant c. the properties of the fluid at any particular point are constant d. all of the above e. none of the above 4. T F Work is done on a turbine by a moving fluid. 5. The mass balance for unsteady-flow is often written as m in – m out = Δ m system and the corresponding energy balance is (Q in +W in + Σ m i θ i ) – (Q out +W out + Σ m e θ e ) = (m 2 e 2 – m 1 e 1 ). These expressions assume that the flow at the inlets and outlets does change with time and this is called ____________ flow. 6. In the development of the second law of thermodynamics, it is convenient to to have a hypothetical body with a relatively large thermal energy capacity (mass x specific heat) that can supply or absorb finite amounts of heat without undergoing any change in temperature. Such a body is referred to as a a. thermal reservoir b. diffuser c. heat pump d. all of the above e. none of the above 7. T F Heat engines operate such that there is a net flow of heat into the system and net work done by

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Midterm22006 - ENGR 225 Recitation 8:30-9:45 Sears 435...

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