Increasing the piston diameter or piston stroke of Otto cycle engine will

The work output per cycle also depends strongly on the compression ratio as well as the

The mean effective pressure of Otto cycle can be increased by increasing the heat transfer into the engine per cycle or by

________ the engine in Otto cycle can increase the power of the cycle but not to increase efficiency.

A _________ is used in aircraft engines and some automotive engine. In this method, a turbine driven by the exhaust gases is used to provide power to compressor or blower at the inlet.

The practical disadvantage of supercharging is that the pressure P3 will be greater in the supercharge engine, resulting in

Most supercharged of turbo-charged engines use fuel injection of gasoline directly to

A diesel cycle has two isentropic, one constant pressure and one.

The ideal cycles are

The thermal efficiency of an ideal cycle is less than that of a totally reversible cycle operating between

The only devices where the changes in kinetic energy are significant are the

The T-s diagram is useful in the analysis of

Equations pertaining to steady flow systems should be used in the analysis of

Equations pertaining to closed systems should be used in the analysis of

The Carnot cycle is a function of the

Thermal efficiency of Carnot cycle increases with _______ at which heat is added to the system or with a decrease in the average temperature at which heat is rejected from the system.

Spark-ignition automobile engines, diesel engines, and the conventional gas turbines are devices which operates on____________, They are also internal combustion engines.

Another assumption which is often utilized to simplify the analysis of air standard assumptions is that air has ________ whose value are determined at room temperature (25° C).

A cycle for which the air-standard assumptions are applicable is frequently referred as

_________basically a piston-cylinder device.

_________is the position of the piston when it forms the smallest volume in the cylinder.

________ is the position of the piston when it forms the largest volume in the cylinder.

The distance between TDC and BDC in which the piston can travel is the

The diameter of the piston is called

The air or air-fuel mixture is drawn into the cylinder through the

The combustion products are expelled from the cylinder through the

The minimum volume formed in the cylinder when the piston is at TDC is called the

The volume displaced by the piston as it moves between TDC and BDC is called

The ratio of the maximum volume formed in the cylinder to the minimum volume is called the _______ of the engine.

Compression ratio is a

_______is the fictitious pressure which, if it acted on the piston during the entire power stroke, would produce the same amount of work as that produced during the actual cycle.

Reciprocating engines are classified as a

In spark-ignition engine, the combustion of the air-fuel mixture is initiated by a

In compression-engine, the combustion of air-fuel mixture is self-ignited as a result of compressing the mixture above its

_________ the piston executes four complete strokes (two mechanical cycles) within the cylinder, and crankshaft completes 2 revolutions for each thermodynamic cycle.

Initially, both the intake and the exhaust valves are closed, and the piston is at its

During compression stroke, the piston moves ______, compressing the air-fuel mixture.

Shortly before the piston reaches its highest position, the spark plugs fires ________ of the system.

In 4 stroke cycle, the useful output is done during the

The pressure in the cylinder is ______________ during the exhaust stroke and slightly below during intake stroke.

Two stroke engine performs intake, compression, expansion and exhaust stroke in ________ only.

Two stroke engines are generally ______________, then four-stroke engines because of isentropic expulsion of the exhaust gases and partial expulsion of fresh air-fuel mixture with the exhaust gases.

Two stroke engine are relatively _________ and have high power-to-weight and power-to-volume ratios, which make them suitable for applications requiring small size and weight such as for motorcycles, chain saws, and lawn mowers.

Two stroke engines has _____________ compared to four stroke engines.

The thermal efficiency of an ideal Otto Cycle depends ________ of the working fluid.

The thermal efficiency of Otto cycle increases as the compression ratio.

Typical compression ratio of Otto cycle is

The premature ignition of the fuel is called

Auto ignition in spark-ignition engine can __________ to the engine.

___________ has been added to gasoline because it is the cheapest method of raising the octane rating.

Is a measure of the engine knock resistance of a fuel.

Leaded gasoline engine has

Most cars have been designed to use unleaded gasoline and the compression ratio had to be lowered to avoid

The thermal efficiency of car engines has been decreased somewhat as a result

The second parameter affecting the thermal efficiency of an ideal Otto cycle is the

Using monatomic gas, the thermal efficiency of Otto cycle

The thermal efficiency of actual spark-ignition engines range from about

The diesel engine is the ideal for CI (compression ignition) in

Invented diesel engine is _________ in the 1890.

If the density of air increases if its ___________ will increase.

The difference between enthalpy and wo flow is

At critical point of T-s diagram in Rankine Cycle the, what s the relation of saturated cycle enthalpy of liquid and vapor?

At one point of a pipe, x = volume flow of liquid, y = specific volume of liquid. The mass flow of liquid is

The fuel used in diesel is __________ than in the fuel used in gasoline engine.

The fuel injection process in diesel engines starts when the piston _________ and continues during the first part of power stroke.

In diesel engine, combustion process during combustion occurs during

The Otto and Diesel cycle differs during

A measure of performance for any power cycle is its

Is the ratio of cylinder volumes after and before the combustion process.

The thermal efficiency of Otto cycle is always _________ the thermal efficiency of Diesel cycle when both cycle operates in the same compression ratio.

If the cutoff ratio decreases, the efficiency of Diesel cycle

If the cutoff ratio is unity, the diesel and Otto Cycle are

The diesel engines also burn the fuel more completely since they usually operate __________ than spark ignition engines.

Thermal efficiencies of diesel engines range from about

The _________ of diesel engines make them the clear choice in applications requiring relatively large amounts of power, such as locomotive engines, emergency power generation units, large ships, and heavy trucks.

A diesel engine can be built as much as At 122 rpm.

A better approach would be to model the combustion process in both gasoline and diesel engines as a combination of two heat transfer Process. This process is known as

In dual cycle, the heat is added during constant volume and _________ process

_____________ is the process during which heat is transferred to a thermal energy storage device.

The regenerator is a device that borrows ________ from the working fluid during one part of the cycle and pays it back during another part of the cycle.

In Stirling cycle, regeneration process works during _________ process.

In Ericsson cycle, the regeneration process occurs during _________ process.

Invented Stirling engine is _________, it is very heavy and complicated.

Both the Stirling and Ericsson cycles are totally reversible as is the

_________ have the same efficiency when operating the same temperature limits.

Both the Stirling and Ericsson cycles are

Are two gases commonly employed in Stirling and Ericsson cycles.

Advantage of Stirling and Ericsson cycle:

In Stirling cycle, Regeneration can

Brayton cycle is invented by

Gas turbines usually operates on an

In gas turbine, the gas is expanded to the

Brayton cycle is made up of __________ Internally reversible process.