Mechanical Engineering - IC Engines and Nuclear Power Plants - Discussion
Discussion Forum : IC Engines and Nuclear Power Plants - Section 1 (Q.No. 3)
3.
In a four stroke cycle, the minimum temperature inside the engine cylinder occurs at the
Discussion:
58 comments Page 5 of 6.
Swasthika kulamarva said:
1 decade ago
I don't think PV=nRT is valid for open systems like engines. It is valid for only closed systems i.e. until inlet and exhaust valves are closed. So, answer is B according to me.
Hari said:
1 decade ago
Temperature is less at the end of the suction stroke, as fresh air also takes the cylinder's hotness.
NIKHILJOSHTE said:
1 decade ago
I think answer B is correct. The inside surface area of cylinder is still hot at the beginning of suction some heat will be transfer to the air by convection at the end of suction.
Segupratheek said:
1 decade ago
He tells the minimum temperature means the ends of suction stroke the piston will comes from TDC to BDC. Because of the friction the minimum heat will be generated. The answer is B.
Gaurav hirani said:
1 decade ago
All those who are giving the reason PV=nRT are only taking into consideration P, V and T parameters, also look at n, at the beginning of stroke n is very less and after the completion of suction stroke n will be higher, and since temp is inversely proportional to n we can also say temperature will be higher at beginning and lesser at end of suction stroke.
Harsh said:
1 decade ago
Option B seems to be more appropriate because the fresh air cools the cylinder and reduces the temperature resulting minimum temperature.
Amit said:
1 decade ago
Answer A is correct because at beginning of suction the temperature is less. As well as the piston move downward the cylinder surface be contact with air and so that cylinder heat absorbed by air and its temperature increases.
Nihit said:
1 decade ago
I think B because at the starting of suction stroke temp. Of gas is atmosphere and gas expand in the cylinder during movement of piston from TDC to BDC (at the end of suction stroke). So temperature of gas decrease.
XYZ said:
1 decade ago
Just check the T-S diagram for 4 stroke engine.
Pupun said:
1 decade ago
At end of the suction process because at that point volume is maximum.
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