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An engine working on air standard Otto cycle has a cylinder diameter of 10 cm and stroke length of 15 cm. The ratio of specific heats for air is 1.4. If the clearance volume is 196.3; cc and the heat supplied per kg of air per cycle is 1800 kJ/kg, then work output per cycle per kg of air is                                     

      (a) 879.1 kJ                                                        (b) 890.2 kJ

      (c) 895.3 kJ                                                        (d) 973.5 kJ

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