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Page 1: Fsall-10 ME 3333 Thermodynamics Exam-1

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PUMP 

Pump inlet 

40 kW

Motor

2 

1 

Mechanical & Aerospace Engineering, Polytechnic Institute of NYU

ME 3333 THERMODYNAMICS

Exam #1 (CLOSED BOOK & NOTES) October 11, Monday, Fall 2010

Name: ______________________ 100 points Poly ID: ______________________ 2 hours 1. (a) Define property. What is the difference between intensive and extensive properties?

Explain with illustration.

(b) The water in a tank is pressurized by air, and the pressure is measured by a multi-fluid manometer as shown in Fig. 1. The tank is located in mountain at an altitude of 1350 m where the atmospheric pressure is 92 kPa. Determine the gage pressure in the tank if h1= 0.2 m, h2 = 0.35 m, and h3 = 0.45 m. Assume the densities of water, oil, and mercury to be 1000 kg/m3, 850 kg/m3, and 13.6 g/cc, respectively. Fig. 1

2. (a) What is the mechanical energy? How does it differ from thermal energy? What are the forms of mechanical energy of a fluid stream?

(b) Consider a stone having a mass of 10 kg and a bucket containing 100 kg of liquid water. Initially the stone is 10.2 m above the water, and the stone and the water are at the same temperature, state 1. The stone then falls into the water. Determine ΔU, ΔKE, ΔPE, Q, and W for the following changes of state, assuming standard gravitational acceleration of 9.81 m/s2, (i) the stone is about to enter the water, state 2, (ii) the stone has just come to rest in the bucket, state 3.

3. (a) What is the difference between the critical point and triple point? Does quality have any meaning at critical point? (b) An oil pump as shown in the Fig. 2 is drawing 40 kW of electric power while pumping oil (density = 900 kg/m3) at rate of 0.2 m3/s. The inlet and outlet diameters of the pipe are 100 mm and 140 mm, respectively. If the pressure rise of oil in the pump is measured to be 400 kPa and the motor efficiency is 90 percent, determine the mechanical efficiency of the pump. Fig. 2

4. (a) A piston cylinder device contains 8 m3 of saturated water vapor. The piston that is free to

move has a mass of 10 kg and a diameter of 20 cm. The local atmospheric pressure is 90 kPa. Determine the temperature and the mass of the vapor inside the cylinder.

(b) A rigid tank contains 12 kg of water at 82.5 oC. If 7 kg of the water is in the liquid form and the rest is in the vapor form, determine (i) the pressure in the tank and (ii) the volume of the tank.

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