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Engineering · Mechanical Engineering
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Time: 120 min (25 Marks) Problem One: Select the one correct, best or most probable statement of the multiple choice answers: 1. the compression stroke at A diesel engine is designed to operate with a compression ratio of 16 and air entering 110 kPa and 20°C. If the energy added during combustion is 1800 kJ/kg, calculate the cutoff ratio- (E) 3.42 (E) 1390 kPa (E) 0.212 kJ/kg (D) 2.62 (D) 1080 kPa (D) 0.122 kJ/K (D) 1225 kJ/kg (D) 320 m/s (D) 2304 kJ/kg (A) 3.22 (C) 2.81 (C) 1120 kPa (C) 0.53 kJ/K (C) 1408 kJ/kg (C) 380 m/s (B) 3.03 2. The MEP of the diesel cycle of Prob. 1 is (A) 1430 kPa (B) 1290 kPa 3. (A) 1.05 kJ/K Find ASnet of a 10-kg copper mass at 100°C if submerged in a 20°C lake. (B) 0.73 kJ/K 4. (A) 1625 kJ/kg Find the maximum work output from a steam turbine if Pl-10 MPa.T1-600°C, and P2 -40 kPa. (E) 1312 kJ/kg (B) 1545 kJ/kg 5.Find the maximum outlet velocity for an air nozzle that operates between 400 and 100 kPaif20 T1 27°C. (A) 570 m/s (E) 520 m/s (B) 440 m/s 6. . Teefficiency of a (A) 2560 kJ/kg n adiabatic steam turbine operating between 10 MPa, 600°C and 40 kPa is 80% what is u2? (E) 2102 k/kg . a (B) 2484 kJkg (C) 2392 kJ/kg A Rankine cycle operates between 10 MPa and 20 kPa. If the high temperature of the steam is 600°C, the put is A) 3375 kJ/kg (E) 3620 k/kg (C) 2875 kJ/kg (C) 1450 kJ/kg (C) 3695 kJ/kg (C) 930 kW (D) 2650 kJkg (D) 1500 kJ/kg (D) 3625 kJkg (D) 730 kW (B) 3065 kJ/kg The turbine output of the Rankine cycle of Prob. 7 is ) 1350 kJ/kg (E) 1602 kJ/k (B) 1400 kJ/kg The steam in the Rankine cycle of Prob. 7 is reheated at 4 MPa to 600°C. The total heat input is 3850 kJ/kg (B) 3745 kJ/kg (E) 3245 kJ/A If the mass flux is 2400 kg/min, the pump power requirement in the Rankine cycle of Prob. 7 is 1580 kW (B) 1260 kW (E) 860 kW

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