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A four stroke double acting petrol engine is used 90 kW brake power on a job. The engine used 40 kg/h of fuel under working condition and its mechanical efficiency is 75%. If the engine friction power reduces by 10 kW then the saving of fuel (in kg/h) is (assume, indicated thermal efficiency remain constant)
  • a)
    0
  • b)
    1.67 kg/h
  • c)
    6.67 kg/hr
  • d)
    3.33 kg/h
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
A four stroke double acting petrol engine is used 90 kW brake power on...
Given, BP = 90 kW, m1= 40 kg/h, ηmech= 0.75
Initial indicated power,

(IP)1 = 90/0.75 = 120 kW
Frictional power, FP =IP−BP = 30 kW
New frictional power, FP = 30−10 =20 kW
(IP)2 = BP + IP =90 + 20 =110 kW
According to question,
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A four stroke double acting petrol engine is used 90 kW brake power on a job. The engine used 40 kg/h of fuel under working condition and its mechanical efficiency is 75%. If the engine friction power reduces by 10 kW then the saving of fuel (in kg/h) is (assume, indicated thermal efficiency remain constant)a)0b)1.67 kg/hc)6.67 kg/hrd)3.33 kg/hCorrect answer is option 'D'. Can you explain this answer?
Question Description
A four stroke double acting petrol engine is used 90 kW brake power on a job. The engine used 40 kg/h of fuel under working condition and its mechanical efficiency is 75%. If the engine friction power reduces by 10 kW then the saving of fuel (in kg/h) is (assume, indicated thermal efficiency remain constant)a)0b)1.67 kg/hc)6.67 kg/hrd)3.33 kg/hCorrect answer is option 'D'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about A four stroke double acting petrol engine is used 90 kW brake power on a job. The engine used 40 kg/h of fuel under working condition and its mechanical efficiency is 75%. If the engine friction power reduces by 10 kW then the saving of fuel (in kg/h) is (assume, indicated thermal efficiency remain constant)a)0b)1.67 kg/hc)6.67 kg/hrd)3.33 kg/hCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A four stroke double acting petrol engine is used 90 kW brake power on a job. The engine used 40 kg/h of fuel under working condition and its mechanical efficiency is 75%. If the engine friction power reduces by 10 kW then the saving of fuel (in kg/h) is (assume, indicated thermal efficiency remain constant)a)0b)1.67 kg/hc)6.67 kg/hrd)3.33 kg/hCorrect answer is option 'D'. Can you explain this answer?.
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