Mechanical Engineering - Thermodynamics - Discussion
Discussion Forum : Thermodynamics - Section 1 (Q.No. 43)
43.
When cut-off ratio is __________ the efficiency of Diesel cycle approaches to Otto cycle efficiency.
Discussion:
23 comments Page 1 of 3.
Manoj Boja said:
8 years ago
Zero is not the right answer.
V2/V1 is the cut off ratio. If it is zero, there is no meaning in it. In diesel cycle heat addition is done in the isobaric process (V2/V1). If that to be changed to isochoric process (V2/V1), it should be 1. Hence it is V1=V2.
V2/V1 is the cut off ratio. If it is zero, there is no meaning in it. In diesel cycle heat addition is done in the isobaric process (V2/V1). If that to be changed to isochoric process (V2/V1), it should be 1. Hence it is V1=V2.
Spandan said:
9 years ago
Cut off ratio is the ratio of cylinder volumes after and before the combustion process. So, obviously, the ratio should be greater than zero.
When the cut-off ratio is 1 the efficiency of diesel cycle approaches to that of otyo cycle.
When the cut-off ratio is 1 the efficiency of diesel cycle approaches to that of otyo cycle.
Vishnu said:
8 years ago
The Answer is correct.
Cut off ratio is inversely proportional to efficiency. And when it become zero efficiencies of diesel engine equal to that of a petrol engine.
Cut off ratio is inversely proportional to efficiency. And when it become zero efficiencies of diesel engine equal to that of a petrol engine.
Waseem said:
8 years ago
Definitely, the answer is zero. It cannot be 1, because if 1 is inserted in an equation of efficiency of diesel cycle.
It becomes indeterminate numbers.
It becomes indeterminate numbers.
Vanraj Gajarotar said:
9 years ago
Right answer is Option D, because cutt-off ratio equal to 1 put in equation then the efficiency of Diesel cycle approaches to Otto cycle efficiency.
Vikram koppula said:
8 years ago
Cut off ratio is should be 1. Then only diesel cycle approaches to Otto cycle efficiency. Cut off and cut off ratio both are different.
Sssrinivas said:
1 decade ago
Otto cycle has more efficiency than diesel one, when cutoff ratio avoids diesel cycle reaches approx to otto.
Tushar Thakare said:
6 years ago
How the volume can be zero. If not then How the Division of Non zero value can be Zero. It should be 1.
Usama Tayyab said:
5 years ago
Cut off should be zero, and if we talk about cutoffs ratio it should be 1.
Vinay said:
5 years ago
Cut off should be zero, and if we talk about cutoffs ratio it should be 1.
(1)
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