What is two stroke engine? 

The otto-cycle engine in a Mercedes-Benz slk230 has a compression ratio of 8.8. What is the ideal efficiency of the engine?

Use:

A turboprop engine consists of a diffuser,
compressor, combustor, turbine, and nozzle. The
turbine drives a propeller as well as the
compressor. Air enters the diffuser with a
volumetric flow rate of 83.7 m3
/s at 40 kPa, 240 K,
and a velocity of 180 m/s, and decelerates
essentially to zero velocity. The compressor
pressure ratio is 10 and the compressor has an
isentropic efficiency of 85%. The turbine inlet
temperature is 1140 K, and its isentropic efficiency
is 85%. The turbine exit pressure is 50 kPa. Flow
through the diffuser and nozzle is isentropic. Using
an air-standard analysis, determine: (a) the power
delivered to the propeller, in MW. (b) the velocity at
the nozzle exit, in m/s. Neglect kinetic energy
except at the diffuser inlet and the nozzle exit

In the figure shown below there are 125 ft of 2 -in pipe, 75ft of 6 -in pipe, and 150 \mathrm{ft} of 3 -in pipe, all cast iron. There are two 90 elbows and an open globe valve, all flanged. If the exit elevation is zero and the elevation at A is 100 ft, what horsepower is extracted by the turbine when the flow rate is 0.16 of water at ? For water at , take and slug/ft.s. For cast iron, . For Re=113500,37800, and 75600 , take f 0.0314,0.0266, and 0.0287 respectively.

sharp 2" entrance: K=0.5; two 2" 90 elbows: K=2(0.39)

2" sudden expansion: K 0.79 ; 3" open globe valve: K 8.5