Mechanical Engineering Exam  >  Mechanical Engineering Questions  >  An open cycle constant pressure gas turbine u... Start Learning for Free
An open cycle constant pressure gas turbine uses a fuel of calorific value 45000 kJ/kg with A/F ratio 60 : 1 and develops a net output of 100 kj/kg of air. The thermal efficiency of the cycle is
  • a)
    10.33%
  • b)
    12%
  • c)
    13.33%
  • d)
    16.67%.
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
An open cycle constant pressure gas turbine uses a fuel of calorific v...
View all questions of this test
Most Upvoted Answer
An open cycle constant pressure gas turbine uses a fuel of calorific v...
Given information:
- Calorific value of fuel = 45000 kJ/kg
- A/F ratio = 60:1
- Net output = 100 kJ/kg of air

To find:
- Thermal efficiency of the cycle

Assumptions:
- The gas turbine operates on an open cycle.
- The combustion process occurs at constant pressure.
- The fuel and air are mixed in the stoichiometric ratio.

Solution:

1. Calculation of the amount of air:
- The stoichiometric ratio of fuel and air is given as 60:1. This means that 1 kg of fuel requires 60 kg of air for complete combustion.
- Since the A/F ratio is 60:1, the amount of air required for 1 kg of fuel is 1/60 kg.
- Therefore, the amount of air required for 1 kg of fuel is 0.0167 kg.

2. Calculation of the heat supplied:
- The heat supplied to the cycle can be calculated using the calorific value of the fuel and the amount of fuel burned.
- The heat supplied per kg of air is given as 45000 kJ/kg. Therefore, the heat supplied per kg of fuel is (45000 kJ/kg) × (0.0167 kg) = 750 kJ/kg.

3. Calculation of the thermal efficiency:
- The net work output of the cycle is given as 100 kJ/kg of air.
- The thermal efficiency of the cycle can be calculated using the formula:

Thermal efficiency = (Net work output / Heat supplied) × 100%

- Substituting the values, we get:

Thermal efficiency = (100 kJ/kg) / (750 kJ/kg) × 100% = 13.33%

Conclusion:
The thermal efficiency of the open cycle constant pressure gas turbine is 13.33%. Therefore, the correct answer is option 'C'.
Attention Mechanical Engineering Students!
To make sure you are not studying endlessly, EduRev has designed Mechanical Engineering study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Mechanical Engineering.
Explore Courses for Mechanical Engineering exam

Similar Mechanical Engineering Doubts

Top Courses for Mechanical Engineering

An open cycle constant pressure gas turbine uses a fuel of calorific value 45000 kJ/kg with A/F ratio 60 : 1 and develops a net output of 100 kj/kg of air. The thermal efficiency of the cycle isa)10.33%b)12%c)13.33%d)16.67%.Correct answer is option 'C'. Can you explain this answer?
Question Description
An open cycle constant pressure gas turbine uses a fuel of calorific value 45000 kJ/kg with A/F ratio 60 : 1 and develops a net output of 100 kj/kg of air. The thermal efficiency of the cycle isa)10.33%b)12%c)13.33%d)16.67%.Correct answer is option 'C'. 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 An open cycle constant pressure gas turbine uses a fuel of calorific value 45000 kJ/kg with A/F ratio 60 : 1 and develops a net output of 100 kj/kg of air. The thermal efficiency of the cycle isa)10.33%b)12%c)13.33%d)16.67%.Correct answer is option 'C'. 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 An open cycle constant pressure gas turbine uses a fuel of calorific value 45000 kJ/kg with A/F ratio 60 : 1 and develops a net output of 100 kj/kg of air. The thermal efficiency of the cycle isa)10.33%b)12%c)13.33%d)16.67%.Correct answer is option 'C'. Can you explain this answer?.
Solutions for An open cycle constant pressure gas turbine uses a fuel of calorific value 45000 kJ/kg with A/F ratio 60 : 1 and develops a net output of 100 kj/kg of air. The thermal efficiency of the cycle isa)10.33%b)12%c)13.33%d)16.67%.Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Mechanical Engineering. Download more important topics, notes, lectures and mock test series for Mechanical Engineering Exam by signing up for free.
Here you can find the meaning of An open cycle constant pressure gas turbine uses a fuel of calorific value 45000 kJ/kg with A/F ratio 60 : 1 and develops a net output of 100 kj/kg of air. The thermal efficiency of the cycle isa)10.33%b)12%c)13.33%d)16.67%.Correct answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of An open cycle constant pressure gas turbine uses a fuel of calorific value 45000 kJ/kg with A/F ratio 60 : 1 and develops a net output of 100 kj/kg of air. The thermal efficiency of the cycle isa)10.33%b)12%c)13.33%d)16.67%.Correct answer is option 'C'. Can you explain this answer?, a detailed solution for An open cycle constant pressure gas turbine uses a fuel of calorific value 45000 kJ/kg with A/F ratio 60 : 1 and develops a net output of 100 kj/kg of air. The thermal efficiency of the cycle isa)10.33%b)12%c)13.33%d)16.67%.Correct answer is option 'C'. Can you explain this answer? has been provided alongside types of An open cycle constant pressure gas turbine uses a fuel of calorific value 45000 kJ/kg with A/F ratio 60 : 1 and develops a net output of 100 kj/kg of air. The thermal efficiency of the cycle isa)10.33%b)12%c)13.33%d)16.67%.Correct answer is option 'C'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice An open cycle constant pressure gas turbine uses a fuel of calorific value 45000 kJ/kg with A/F ratio 60 : 1 and develops a net output of 100 kj/kg of air. The thermal efficiency of the cycle isa)10.33%b)12%c)13.33%d)16.67%.Correct answer is option 'C'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
Explore Courses for Mechanical Engineering exam

Top Courses for Mechanical Engineering

Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev