Q2: A two-stroke diesel engine was electrically motored (non-firing operation) when the mete reading was 1.5 kW. Then the test on the engine was carried out for firing operation and th following observations were recorded: brake torque = 120 N.m; speed = 600 rpm. (i) Determin the brake power (b.p), the indicated power (ip), and mechanical efficiency (nm). (ii) Draw u the heat balance sheet on percentage basis, if the fuel used = 2.5 kg/hr; calorific value of fuel 40.3 MJ/kg; cooling water used = 818 kg/hr; rise in temperature of cooling water 10°C exhaust gas temperature = 345°C; room temperature 25°C; AFR = 32:1. Tak (n=42 kl/kg K and Cn = 1.05 kl/kg K Assume n = = - 98%

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Q2: A two-stroke diesel engine was electrically motored (non-firing operation) when the meter
reading was 1.5 kW. Then the test on the engine was carried out for firing operation and the
following observations were recorded: brake torque = 120 N.m; speed = 600 rpm. (i) Determine
the brake power (b.p), the indicated power (ip), and mechanical efficiency (nm). (ii) Draw up
the heat balance sheet on percentage basis, if the fuel used = 2.5 kg/hr; calorific value of fuel =
40.3 MJ/kg; cooling water used = 818 kg/hr; rise in temperature of cooling water = 10°C;
exhaust gas temperature 345°C; room temperature 25°C; AFR = 32:1. Take
Cpw = 4.2 kJ/kg.K and Cpesh = 1.05 kJ/kg.K. Assume comb = 98%.
=
=
Transcribed Image Text:Q2: A two-stroke diesel engine was electrically motored (non-firing operation) when the meter reading was 1.5 kW. Then the test on the engine was carried out for firing operation and the following observations were recorded: brake torque = 120 N.m; speed = 600 rpm. (i) Determine the brake power (b.p), the indicated power (ip), and mechanical efficiency (nm). (ii) Draw up the heat balance sheet on percentage basis, if the fuel used = 2.5 kg/hr; calorific value of fuel = 40.3 MJ/kg; cooling water used = 818 kg/hr; rise in temperature of cooling water = 10°C; exhaust gas temperature 345°C; room temperature 25°C; AFR = 32:1. Take Cpw = 4.2 kJ/kg.K and Cpesh = 1.05 kJ/kg.K. Assume comb = 98%. = =
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