Q-4 An air standard Diesel cycle that has acompression ratio of 18 and the cut off ratio of 2.1. At the beginning of the compression Process, the temperature, pressure and volume are 300k, lookpa and 0.005m³ respectively. Calculate ①maximum pressure The temperature at the end of adiabatic expansion 3 work mean effective pressure. For air take Cp = 1.0035 kj/kg.k and R = 0.287 Ki/kg k done

The compression ratio of an Otto cycle is 8, at the beginning of the zanthropic compression process, the pressure of the air is 100 kPa, the temperature is 27 "C, the volume is 550 cm. At the end of the lzantropic expansion process, the temperature of the air is 700 K. Using the specific temperature values ​​at room temperature (according to the cold air standard assumptions) Find the gravity of the air.

A The compression ratio of a diesel cycle is 15.5, and the cutoff occurs at 10% of the stroke. 14 psia and 600 K characterize state 1. Calculate the following for the hot-air standard with k= 1.34 and a starting volume of 2 cu ft: Qin a. Find T2 , P2 , V2 , T3 , V3 , P4 , and T4 3 P = P, b. Compute the heat added (QA), Wout heat rejected (Qr), work (W) and the cycle efficiency (e). P. c. for a rate of circulation of 1000 cfm, Qout compute the horsepower.

In a C.I. engine working on the dual combustion cycle the compression ratio is 12.5:1. Air at 101.3kPa and 35°C is compressed adiabatically. Fuel is then added until the pressure reaches 4000kPa, then at constant pressure to a temperature of 1425°C. After adiabatic expansion to the initial volume exhaust takes place. Calculate: (a). work done/kg air (b). thermal efficiency

Q3:A small truck has #cylinder ,4 liter compression ignition engine that operates on irstandard Dual cycle with air fuel ratio of 16:1, the compression ratio is 17 and the cylinderdiameter is 14.5Cm. At the start of compression stroke Ta=5O'C and Pa=100 kpa .It can beassumed the half of the heat input is added at constant volume and halt at constant pressureCalculate:-Temperature and pressure at each state of the cycle. -Indicated thermal efficiency.

Q3: An Otto cycle has a compression ratio of (8.5) at the beginning of the com. Press ion stroke, the temperature is (300K) and the pressure is (90KPa). If the heat input is (800Kj) and the maximum temperature in the cycle is 1100K, determine (a) The mass of air in the cycle. (b)The heat rejection. (c) thermal efficiency. (d) The mean effective pressure.

Instead, assume variable specific heat An ideal Diesel cycle has a compression ratio of 17and a cutoff ratio of 1.3. Determine the maximum tempera-ture of the air and the rate of heat addition to this cycle whenit produces 140 kW of power and the state of the air at thebeginning of the compression is 90 kPa and 578C. Use con-stant specific heats at room temperature

DUAL CYCLE Problem. Please show your solution completely.

art Il: Power Cycles & Fluid Assume an Otto cycle with compression ratio of CR = 9 1. The intake air is at 100kPa, 20°C, and the volume of the chamber is 500cm prior to the compression stroke. The temperature at the end of the adiabatic expansion is T. 800K. If air specific heat capacity at constant pressure of air at atmospheric pressure and room temperature is c 1.01KJ/kgK Specific heat capacity at constant volume of air at atmospheric pressure and room temperature: Cy = 0.718KJ/kgK Calculate: (i) the mass of the intake air (ii) the temperature T3, (iii) the pressure pa, (iv) the amount of heat added by burning fuel-air mixture (v) the thermal efficiency of the cycle;B (vi) the mean effective pressure (MEP).

4. The open cycle gas turbine operate on Brayton cycle with pressure ratio 4.5/1. Air enter the compressor at 210C and heated to 7800C at entry to the turbine. If mass flow rate is 140kg/min, Determine: a. e b. Wnet