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ME303 Final Exam - Thermal-Fluid Systems
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MCQs on Mechanical Engineering - Thermal-Fluid Systems.

ME303 Final Exam - Thermal-Fluid Systems
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25 Questions

1. In studying Bernoulii's equation and the forms for the relationship between pressure drop and flow rate for an orifice plate and venturi meter, the results can be summarized by which of the following statements?
2. What is the most efficient thermodynamic cycle for interconverting work and heat commonly called?
3. A refrigerator with a COP of 3 is used to produce 1000 lbs/day of ice from water at 0°C. What is the minimum power required using this refrigerator?
4. Air is flowing through a pipe with an internal diameter of 15 cm. It passes through an orifice of diameter 8 cm. The air density at the operating conditions is about 1.3 kg/m3. The observed pressure difference across the orifice is approximately 100 mm Hg, and the flow coefficient for the orifice is approximately 0.7. What is the mass flow rate of air?
5. The schematic depicts a shell-and-tube heat exchanger. If fluids enter at 1 and 2, then the flow configuration is said to be which of the following?
6. A sharp crested, contracted, rectangular weir of length 12 ft and height 1 ft exhibits a head (h0) of 2 inches of water. Calculate the water flow in ft3/s. Assume the head of velocity approach is small.
7. Important factors for choosing a pipe material include which of the following?
8. A reciprocating, spark ignition, engine takes in an air-fuel mixture at 20°C. It has a compression ratio of 10. The air-to-fuel ratio is 12, and the heating value of the fuel is 60,000 kJ/kg. For an air standard cycle analysis, what is the largest pressure reached? You may assume Cv is approximately 0.7 kJ/kg K and Cp/Cv approximately 1.4.
9. When are water-LiBr absorption systems for cooling useful?
10. A piece of analytical equipment employs very narrow diameter tubing to supply solvent (density = 0.9 g/cm3, viscosity = 0.78 cP) to a workstation at a flow rate of 5 ml/min. The internal diameter of the tubing is 1000
m and the length of the tubing is 75 cm. What is the pressure drop in the tubing?
11. Fill in the blank. Pressure drops for elements in series are _________________.
12. Solvent pairs used for refrigeration-absorption include all of the following, EXCEPT:
13. Calculate the maximum COP for a vapor absorption refrigeration system operating with a heat source (generator) at 90°C, a chiller temperature (absorber) of 5°C, and a condenser temperature of 30°C.
14. Which of the following is a state variable?
15. Fill in the blank. A reversible, adiabatic process may also be called ________________.
16. A centrifugal pump can provide a flow of 20 L/min at a pressure of 20 psi above atmospheric pressure. What is the minimum pipe diameter (
) that can be used to carry water for 50 m?
17. Vapor compression refrigeration systems are most closely associated with which cycle?
18. A centrifugal pump is used to lift water at five gallons per minute against a head of 50 feet of water. The efficiency of the pump is 70%. Approximately, what is the power required by the pump?
19. Which of the following is a form of anemometry?
20. A fluid with density 0.78 g/cm3 and viscosity 2.3 cP flows at 1 gallon per minute through a 2 inch internal diameter pipe. The flow should be considered as which of the following?
21. For gas flow in a pipe, as the pressure decreases downstream the gas velocity does which of the following?
22. In considering the exits of two pumps or blowers configured in parallel, which of the following statements is true?
23. The first practical steam engine was produced about how many years ago?
24. The power input for vapor absorption refrigeration systems is best described by which of the following?
25. Four states of an ideal Rankine cycle for an unknown fluid are shown in the table below. Calculate the turbine power for a fluid rate of 10 kg/s.
State
T(C)
P (kPa)
H(kJ/kg)
S (kJ/kg K)
1
300
1000
750
10
2
50
10
512
10
3
50
10
75
2
4
50
1000
75
2

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