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Engine has a brake power output of 8kW. Mechanical efficiency of engine is 80%. Calorific value is 40 MJ/kg. ISFC (indicated specific fuel consumption) in kg/kW hr is:-
(Assume indicated thermal efficiency to be 35%)
  • a)
    1.53
  • b)
    0.153
  • c)
    2.57
  • d)
    0.257
Correct answer is option 'D'. Can you explain this answer?
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Calculation of ISFC:

1. Calculate Brake Power Output:
Given, Brake Power Output = 8 kW

2. Calculate Indicated Power Output:
Mechanical efficiency = 80%
Brake Power Output = Indicated Power Output * Mechanical Efficiency
Indicated Power Output = Brake Power Output / Mechanical Efficiency
Indicated Power Output = 8 kW / 0.8 = 10 kW

3. Calculate Indicated Thermal Efficiency:
Given, Indicated Thermal Efficiency = 35%

4. Calculate Heat Input:
Indicated Thermal Efficiency = Output / Input
Input = Output / Indicated Thermal Efficiency
Input = Indicated Power Output / Indicated Thermal Efficiency
Input = 10 kW / 0.35 = 28.57 kW

5. Calculate Fuel Consumption:
Calorific Value = 40 MJ/kg
Fuel Consumption = Heat Input / Calorific Value
Fuel Consumption = 28.57 kW / 40 MJ/kg = 0.71425 kg/hr

6. Calculate ISFC:
ISFC = Fuel Consumption / Brake Power Output
ISFC = 0.71425 kg/hr / 8 kW = 0.257 kg/kW hr

Therefore, the ISFC in kg/kW hr is 0.257. Hence, the correct answer is option 'D'.
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Engine has a brake power outputof 8kW. Mechanical efficiency ofengine is 80%. Calorific value is40 MJ/kg. ISFC (indicated specificfuel consumption) in kg/kW hr is:-(Assume indicated thermalefficiency to be 35%)a)1.53b)0.153c)2.57d)0.257Correct answer is option 'D'. Can you explain this answer?
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Engine has a brake power outputof 8kW. Mechanical efficiency ofengine is 80%. Calorific value is40 MJ/kg. ISFC (indicated specificfuel consumption) in kg/kW hr is:-(Assume indicated thermalefficiency to be 35%)a)1.53b)0.153c)2.57d)0.257Correct answer is option 'D'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Engine has a brake power outputof 8kW. Mechanical efficiency ofengine is 80%. Calorific value is40 MJ/kg. ISFC (indicated specificfuel consumption) in kg/kW hr is:-(Assume indicated thermalefficiency to be 35%)a)1.53b)0.153c)2.57d)0.257Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Engine has a brake power outputof 8kW. Mechanical efficiency ofengine is 80%. Calorific value is40 MJ/kg. ISFC (indicated specificfuel consumption) in kg/kW hr is:-(Assume indicated thermalefficiency to be 35%)a)1.53b)0.153c)2.57d)0.257Correct answer is option 'D'. Can you explain this answer?.
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