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Single cylinder four stroke C.I. engine running at 2800 rpm has bore diameter of 90mm and stroke length of 120mm. Air consumption is 0.80 kg per minute. Brake power output is 10 kW. Air-fuel ratio is 20:1. Calorific value is 42 MJ/kg. Density of ambient air is 1.18 kg/ m3.
Q. Brake specific fuel consumption is:-
- a)2.4 kg/kWh
- b)0.24 kg/kWh
- c)4.8 kg/kWh
- d)0.48 kg/kWh
Correct answer is option 'B'. Can you explain this answer?
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Single cylinder four stroke C.I.engine running at 2800 rpm has boredia...
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Brake Specific Fuel Consumption (BSFC) is a measure of the fuel efficiency of an engine. It represents the amount of fuel consumed by the engine to produce a unit of power. In this case, we need to calculate the BSFC for a single cylinder four-stroke C.I. engine.
Given data:
- Engine speed (rpm): 2800
- Bore diameter (mm): 90
- Stroke length (mm): 120
- Air consumption (kg/min): 0.80
- Brake power output (kW): 10
- Air-fuel ratio: 20:1
- Calorific value (MJ/kg): 42
- Density of ambient air (kg/m3): 1.18
To calculate BSFC, we need to determine the fuel consumption rate and the power output of the engine.
1. Determine the displacement volume of the engine:
Displacement volume (Vd) = (π/4) * (bore diameter)^2 * stroke length
Vd = (π/4) * (90^2) * 120
Vd = 2864788 mm3
2. Convert displacement volume to liters:
Displacement volume (Vd) = 2864788 mm3 = 2864.788 cm3 = 2.864788 liters
3. Determine the fuel consumption rate:
Fuel consumption rate = Air consumption rate / Air-fuel ratio
Fuel consumption rate = 0.80 kg/min / 20
Fuel consumption rate = 0.04 kg/min
4. Convert fuel consumption rate to kg/s:
Fuel consumption rate = 0.04 kg/min = 0.04 / 60 kg/s
Fuel consumption rate = 0.00067 kg/s
5. Determine the brake specific fuel consumption:
BSFC = Fuel consumption rate / Brake power output
BSFC = 0.00067 kg/s / 10 kW
BSFC = 0.000067 kg/s/kW
6. Convert BSFC to kg/kWh:
BSFC = 0.000067 kg/s/kW * 3600 s/h * 1000 Wh/kW
BSFC = 0.24 kg/kWh
Therefore, the brake specific fuel consumption for this engine is 0.24 kg/kWh. So, option 'B' is the correct answer.
Given data:
- Engine speed (rpm): 2800
- Bore diameter (mm): 90
- Stroke length (mm): 120
- Air consumption (kg/min): 0.80
- Brake power output (kW): 10
- Air-fuel ratio: 20:1
- Calorific value (MJ/kg): 42
- Density of ambient air (kg/m3): 1.18
To calculate BSFC, we need to determine the fuel consumption rate and the power output of the engine.
1. Determine the displacement volume of the engine:
Displacement volume (Vd) = (π/4) * (bore diameter)^2 * stroke length
Vd = (π/4) * (90^2) * 120
Vd = 2864788 mm3
2. Convert displacement volume to liters:
Displacement volume (Vd) = 2864788 mm3 = 2864.788 cm3 = 2.864788 liters
3. Determine the fuel consumption rate:
Fuel consumption rate = Air consumption rate / Air-fuel ratio
Fuel consumption rate = 0.80 kg/min / 20
Fuel consumption rate = 0.04 kg/min
4. Convert fuel consumption rate to kg/s:
Fuel consumption rate = 0.04 kg/min = 0.04 / 60 kg/s
Fuel consumption rate = 0.00067 kg/s
5. Determine the brake specific fuel consumption:
BSFC = Fuel consumption rate / Brake power output
BSFC = 0.00067 kg/s / 10 kW
BSFC = 0.000067 kg/s/kW
6. Convert BSFC to kg/kWh:
BSFC = 0.000067 kg/s/kW * 3600 s/h * 1000 Wh/kW
BSFC = 0.24 kg/kWh
Therefore, the brake specific fuel consumption for this engine is 0.24 kg/kWh. So, option 'B' is the correct answer.
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Single cylinder four stroke C.I.engine running at 2800 rpm has borediameter of 90mm and strokelength of 120mm. Air consumptionis 0.80 kg per minute. Brake poweroutput is 10 kW. Air-fuel ratio is20:1. Calorific value is 42 MJ/kg.Density of ambient air is 1.18 kg/m3.Q.Brake specific fuel consumptionis:-a)2.4 kg/kWhb)0.24 kg/kWhc)4.8 kg/kWhd)0.48 kg/kWhCorrect answer is option 'B'. Can you explain this answer?
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Single cylinder four stroke C.I.engine running at 2800 rpm has borediameter of 90mm and strokelength of 120mm. Air consumptionis 0.80 kg per minute. Brake poweroutput is 10 kW. Air-fuel ratio is20:1. Calorific value is 42 MJ/kg.Density of ambient air is 1.18 kg/m3.Q.Brake specific fuel consumptionis:-a)2.4 kg/kWhb)0.24 kg/kWhc)4.8 kg/kWhd)0.48 kg/kWhCorrect answer is option 'B'. 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 Single cylinder four stroke C.I.engine running at 2800 rpm has borediameter of 90mm and strokelength of 120mm. Air consumptionis 0.80 kg per minute. Brake poweroutput is 10 kW. Air-fuel ratio is20:1. Calorific value is 42 MJ/kg.Density of ambient air is 1.18 kg/m3.Q.Brake specific fuel consumptionis:-a)2.4 kg/kWhb)0.24 kg/kWhc)4.8 kg/kWhd)0.48 kg/kWhCorrect answer is option 'B'. 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 Single cylinder four stroke C.I.engine running at 2800 rpm has borediameter of 90mm and strokelength of 120mm. Air consumptionis 0.80 kg per minute. Brake poweroutput is 10 kW. Air-fuel ratio is20:1. Calorific value is 42 MJ/kg.Density of ambient air is 1.18 kg/m3.Q.Brake specific fuel consumptionis:-a)2.4 kg/kWhb)0.24 kg/kWhc)4.8 kg/kWhd)0.48 kg/kWhCorrect answer is option 'B'. Can you explain this answer?.
Single cylinder four stroke C.I.engine running at 2800 rpm has borediameter of 90mm and strokelength of 120mm. Air consumptionis 0.80 kg per minute. Brake poweroutput is 10 kW. Air-fuel ratio is20:1. Calorific value is 42 MJ/kg.Density of ambient air is 1.18 kg/m3.Q.Brake specific fuel consumptionis:-a)2.4 kg/kWhb)0.24 kg/kWhc)4.8 kg/kWhd)0.48 kg/kWhCorrect answer is option 'B'. 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 Single cylinder four stroke C.I.engine running at 2800 rpm has borediameter of 90mm and strokelength of 120mm. Air consumptionis 0.80 kg per minute. Brake poweroutput is 10 kW. Air-fuel ratio is20:1. Calorific value is 42 MJ/kg.Density of ambient air is 1.18 kg/m3.Q.Brake specific fuel consumptionis:-a)2.4 kg/kWhb)0.24 kg/kWhc)4.8 kg/kWhd)0.48 kg/kWhCorrect answer is option 'B'. 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 Single cylinder four stroke C.I.engine running at 2800 rpm has borediameter of 90mm and strokelength of 120mm. Air consumptionis 0.80 kg per minute. Brake poweroutput is 10 kW. Air-fuel ratio is20:1. Calorific value is 42 MJ/kg.Density of ambient air is 1.18 kg/m3.Q.Brake specific fuel consumptionis:-a)2.4 kg/kWhb)0.24 kg/kWhc)4.8 kg/kWhd)0.48 kg/kWhCorrect answer is option 'B'. Can you explain this answer?.
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