Explanation: Otto cycle is more efficient than Diesel cycle for a given compression ratio. 6. For constant maximum pressure and heat input, the air standard efficiency of the gas power cycle is in the order. Explanation: None.
Which cycle is the most efficient of these for the same compression ratio of Otto cycle B Diesel cycle?
Explanation: Otto cycle is more efficient than Diesel cycle for a given compression ratio. 6. For constant maximum pressure and heat input, the air standard efficiency of the gas power cycle is in the order. Explanation: None.
Which cycle has the highest efficiency for the same compression ratio and heat addition?
The cycle which has the least heat rejected will have the highest efficiency. Thus, the Otto cycle is the most efficient and the Diesel cycle is the least efficient of the three cycles.
Which cycle is more efficient?
Classical thermodynamics indicates that the most efficient thermodynamic cycle operating between two heat reservoirs is the Carnot engine [1] , and a basic theorem expresses that any reversible cycle working between two constant temperature levels should have the same efficiency as a Carnot cycle [2].
What is the same compression ratio?
Theoretically, at a same compression ratio, gasoline engine would have higher efficiency . ... If we use a compression ratio of 10 for both engines, gasoline engine will operate normally while diesel engine might not operate at all.
What is the compression ratio for Otto cycle?
In the ideal Otto cycle the fuel-air mixture is introduced during the induction stroke and compressed to a much lower compression ratio ( around 8:1 ) and is then ignited by a spark. The combustion results in a sudden jump in pressure while the volume remains essentially constant.
What is K in Otto cycle?
Thermal Efficiency Derivation
A typical value for an air/fuel mixture is k = 1.35 .
Why CI engines are mostly used?
The compression ignition engine or diesel engine is the type that has most commonly been used for power generation , particularly in off-grid situations. The engine uses a higher compression ratio than a spark ignition engine to heat air in the engine cylinder.
Which cycle is most efficient cycle for same maximum pressure and heat input?
The maximum pressure is same and same heat input is given. It is clear from T-S diagram that heat rejected by diesel cycle (4′ – 1) is less than heat rejected by Otto cycle (4 – 1). Hence the diesel cycle is more efficient than Otto cycle.
What is the cutoff ratio?
The cutoff ratio is the ratio of the time required for water to advance to the end of the furrow divided by total set time. Cutoff Ratio = Average Advance Time/Set Time . Research has been conducted to determine the “best” cutoff ratio for various types of furrow irrigation systems and soil types.
Why is the Carnot cycle the most efficient?
The Efficiency of Carnot’s Cycle
Practical engine cycles are irreversible and thus have inherently lower efficiency than the Carnot efficiency when operating at the same temperatures. ... The Carnot cycle achieves maximum efficiency because all the heat is added to the working fluid at the maximum temperature .
Which cycle has the highest thermal efficiency?
The thermal efficiency of the ideal Otto cycle increases with an increasing compression ratio. 2. an actual version of this cycle used in internal combustion engines.
Which cycle is more efficient for electricity generation plant?
The Brayton (gas turbine) cycle , which makes one-half of the electricity in the IFCC, is inherently more efficient than a Rankine (steam) cycle, because there is no loss of the heat of vaporization of the water to make steam in the Brayton cycle.
What octane is needed for 11 1 compression?
95 Octane . Gasoline with this octane number is known in Indonesia under the brands Pertamax Plus (produced by Pertamina), Super Extra (produced by Shell), and Primax (produced by Petronas). This type of gasoline is advisable for car engines with compression ratios of 11:1 to 12:1.
What happens if compression ratio is too high?
Higher octane means the fuel can resist self-ignition at a higher pressure and temperature than a fuel with a lower octane rating. All things equal, engines with higher compression ratios require higher fuel octane. ... For this reason, running a higher compression can cause engine damage, but that’s gradually changing.
What is a good compression ratio?
Compression ratios usually vary between 1.05–7 per stage; however, a ratio of 3.5–4.0 per stage is considered maximum for most process operations. Quite often, the temperature rise of the gas during the compression dictates a limit for the safe or reasonable pressure rise.
