Thermal Efficiency and Compression Ratio Quiz

The inc______ease in the______mal efficiency with , howeve, is not as p______onounced at high ’s. When highe ______ is used, the tempe______atu______e of the ai______-fuel mixtu______e may ______ise above the auto-ignition tempe______atu______e of the fuel du______ing the comp______ession p______ocess, causing an ea______ly and ______apid bu______n of fuel even befo______e the spa______k ignition. This ea______ly and apid bu______n p______oduces an audible noise, which is called engine knock. Autoignition (the p______ematu______e ignition of fuel) in spa______k-ignition engines cannot be tole______ated since it hu______ts engine pe______fo______mance and can cause damage. Thus, the______e is an uppe limit to comp______ession atio fo spa______k-ignition engines. Tet______aethyl lead is used as an antiknock additive in gasoline and jet fuels to inc______ease octane ______ating. Octane ______ating is the measu______e of the engine knock esistance of fuel. Fuels with a highe octane ______ating.

Under cold-air standard assumption is only a function of the compression ratio. Thus, a higher r can generate a higher ______.

The ______ under cold-air standard assumption is only a function of the compression ratio. Thus, a higher r can generate a higher thermal efficiency.

______ is used as an antiknock additive in gasoline and jet fuels to increase octane rating.

______ (the premature ignition of fuel) in spark-ignition engines cannot be tolerated since it hurts engine performance and can cause damage.

Thermodynamic cycles can be divided i______ power generation and refrigeration cycles.

Power generation and refrigeration are usually accomplished by systems that operate on a thermodynamic c______.

A system completes a thermodynamic cycle when after undergoing two or more processes, it returns back to its i______ state.

The student should be able to identify simplifying assumptions for the analysis of power and refrigeration c______.

The end of the chapter, the student should be able to solve problems on thermodynamic c______ by applying the fundamental concepts learned.