Helium enters a continuous flow compressor at 326 K and leaves at 441 K. If the mass flow rate is 1.5 kg/s, which of the following is the required power? (Cp = 5.1926 kJ/kgK) a) 988.7 kW B) 895.7 kW NS) 617.9 kW D) 927.9 kW TO) 836.0 kW
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Helium enters a continuous flow compressor at 326 K and leaves at 441 K. If the mass flow rate is 1.5 kg/s, which of the following is the required power? (Cp = 5.1926 kJ/kgK) |
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- Energy balance results (in kW) obtained for the same medium speed single cylinder diesel engine are reported in the following table. For case 1, if the coolant temperature is 105 °C at the outlet of the engine and the volumetric flow rate is 0.22*10-3 m3/s, the temperature of the coolant at the inlet is (in °C): (The coolant is considered water with a density 999 kg/m3 and a specific heat 4.2 k/kg.K). Case N (rpm) bmep (bar) W. O ambient Q ahast shaft 2.2 4.2 19.1 60.3 9.90 3.52 1 500 7.1 24.5 23.8 500 6.1 3.6 5.2 400 3.50 4.9 4.1 1.4 Select one: O a. 142.1 O b. 112.7 O c. 97.31 O d. 87.2 O e. 370.31In a steam turbine system, suppose the value of ∆mH is constant (meaning, inlet and outlet conditions are maintained). From the energy balance equation, Qnet + Wnet = ∆mH + ∆KE + ∆PE or −0.1209 kW − 70 kW = ??̇? + 8.75 kW − 0.0068kW 1. What will happen to Wnet if there was no increase in kinetic energy, will the magnitude of Wnet increase or decrease? What should be the sign of potential energy so that Wnet will increase in magnitude?2. For a turbine system, what should happen to Qnet, ∆KE, and ∆PE to maximize the work done by the turbine? Which factor is the most significant?Air passes through a narrow section during horizontal flow. The initial air temperature is 21 [℃], flow rate 91.5 [m / s], pressure 10.56 [Kg / cm2 abs], later flow rate 152 [m/s], pressure 7.05 [Kg/cm2. abs], what is the temperature of the air at the outlet if there is no outside or heat coming in? The average specific heat of air is 7 [kcal / kg mol. ℃] and calculate as an ideal gas.
- 39 - The speed of the air entering a nozzle at the nozzle exit was 196 m/s and its density was measured as 0.681 kg/m³. Since the mass flow rate in the nozzle is 1,421 kg/s continuously, which of the following is the outlet cross-sectional area of the nozzle? a) 48,325 cm² B) 49,373 cm² NS) 106,461 cm² D) 110,603 cm² TO) 84,678 cm²What is the engine bore (in mm) required for good volumetric efficiency for an engine with two inlet and two exhaust valves, stroke of 90 mm, inlet air temperature of 332 K, exhaust temperature of 900 K, engine speed of 8200 rpm and exhaust valve diameter Assume specific heat ratio =1.3, R = 287 J/kg.K, and an average inlet flow coefficient 0.4 and an average exhaust flow coefficient 0.5. mm (each). Select one: O a. 96.57 O b. 70.23 O c. 105.2 O d. 91.05 O e. 82.71Inlet: Air, 72 kPa, 291.15K, 230 meters/second Outlet: Air, 98 kPa, 0 meters/second What is the temperature at the outlet? Cp=3.5(8.3145). No heat exchange.
- 1) A plot of pump net head is shown below. Two curves are drawn: blue color curve and red color curve. Which one is called pump performance curve? Will the location of pump performance curve change if the velocity of the fluid at pump outlet changes? a) red curve; No, the location will not change b) blue curve; yes, the location will change c) red curve; yes, the location will change d) blue curve; No, the location will not change 2) In a turbine system, states A and B are homologous. If the net head ratio HA/HB =16 , volume flow rate ratio VA˙/VB˙=9. What is the diameter ratio DA/DB ? a) 3/2 b) 6 c) 12 d) 2/3Air flows steadily through an engine at constant temperature, 127 deg C. Assuming that the Kinetic and Potential energies are negligible and if the exit pressure is one-fourth of the initial pressure, in which the initial pressure is 702 kPa, the work per mass is Answer kJ (nearest whole number).HANDWRITTEN AND FINAL ANSWER MUST BE IN ENGLISH UNITS. Show solution. An experimental gas turbine engine is under development to increase its mechanical efficiency. It has a turbine efficiency of 95% and compressor efficiency of 85%. The following parameters are provided: P1 = 550 kPa, T1 = 25 deg C, rp = 5.5, T3 = 1450 deg C, Wnet = 5500 kW. Compute for the (a) flow rate and (b) mean effective pressure. Consider Ethane as your working fluid.
- 32 - A fixed volume insulated tank, initially empty, was connected to a distribution line carrying helium gas at 115ºC by means of a valve. The valve is opened first and closed when the pressure is the same as the distribution line pressure. What is the final internal energy of helium in the tank? (Internal energy of the warehouse in the final state = Enthalpy of the distribution line). (Cp=5.1926) will be taken. a) 2014.7 kJ/kg B) 649.1 kJ/kg NS) 2118.6 kJ/kg D) 2066.7 kJ/kg TO) 597.1 kJ/kg1000 cfm of air at 95°F dry bulb, 74°F wet bulb is mixed with 2000 cfm of air at 65°F dry bulb, 54°F wet bulb. Determine the volumetric flow rate of the mixed stream.A. 1845 cfmB. 2445 cfmC. 2745 cfmD. 3104 cfmA turbine is driven by a system that enters the turbine at the ff. conditions: 200 kg/h, 39 atm, 501 deg C, 49 m/s linear speed. The steam exits at a point 8 meters below the inlet stream of the turbine with the following conditions: atmospheric pressure, 290 m/s speed. 69000 W of shft work is delivered by the turbine while 100 kcal/h heat is lost. What is the value of (a) expansion work and (b) flow work? If the value is zero, explain why is it so.If it cannot be calculated, explain why.