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Anonymous

Asked: 1 month agoIn: Mechanical Engineering

An ideal Otto cycle has a compression ratio of 7. At the beginning of the compression process, P1 = 90 kPa, T1 = 27°C and V1 = 0.004 m³. The maximum cycle temperature is 1137°C. For each repetition of the cycle, calculate the heat rejection and the net work production. Also, calculate the thermal efficiency and mean effective pressure for this cycle. Use constant specific heats at room temperature. The properties of air at room temperature are Cp = 1.005kJ / kgK Cv = 0.718kJ / k gK R = 0.287kJ / k gK and k = 1.4 The heat rejection is kJ. kJ. The net work production is The thermal efficiency is The mean effective pressure kPa.

An ideal Otto cycle has a compression ratio of 7. At the beginning of the compression process, P1 = 90 kPa, T1 = 27°C and V1 = 0.004 m³. The maximum cycle temperature is 1137°C. For each repetition ...Read more

Tuntun KumarBegginer

Asked: 2 months agoIn: Mechanical Engineering

A 1 kW stirring motor is applied to a tank of water. The tank contains 15 kg of water and the stirring action is applied for 1/2 hr. If the tank is perfectly insulated, calculate the change in internal energy of the water, assuming that the process occurs at constant pressure and C, of water may be taken as 4.18 kJ/kgK. Also calculate the rise in temperature.

A 1 kW stirring motor is applied to a tank of water. The tank contains 15 kg of water and the stirring action is applied for 1/2 hr. If the tank is perfectly insulated, calculate the change in ...Read more

Priya SinghPundit

Asked: 1 month agoIn: Food Technology

Define the compressibility factor, and explain its importance in real gas behaviour.

Sumit KumarPundit

Asked: 4 weeks agoIn: Mechanical Engineering

In Fig. P3.5, CV A is the mass inside a piston/ cylinder, and CV B is the mass plus the piston outside, which is the standard atmosphere. Write the energy equation and work term for the two CVs, assuming we have a nonzero Q between state 1 and state 2?

CV A is the mass inside a piston/ cylinder, and CV B is the mass plus the piston outside, which is the standard atmosphere. Write the energy equation and work term for the two CVs, assuming we ...Read more

VishalProfessional

Asked: 2 months agoIn: Mechanical Engineering

The following readings were taken during the test of four-stroke single cylinder petrol engine: Load on brake drum = 50 kg; Diameter of brake drum = 1,250 mm Spring balance reading = 7 kg; Engine speed = 450 rpm Fuel consumption = 4 kg/hr; Calorific value of fuel = 43,000 kJ/kg Calculate: (i) indicated thermal efficiency, and (ii) brake thermal efficiency. Assume mechanical efficiency as 70%.

The following readings were taken during the test of four-stroke single cylinder petrol engine: Load on brake drum = 50 kg; Diameter of brake drum = 1,250 mm Spring balance reading = 7 kg; Engine speed = 450 ...Read more

Tuntun KumarBegginer

Asked: 2 months agoIn: Mechanical Engineering

An insulated rigid tank having 5 kg of air at 3 atm and 30°C is connected to an air supply line at 8 atm and 50°C through a valve. The valve is now slowly opened to allow the air from the supply line to flow into the tank until the tank pressure reaches 8 atm and the valve is closed. Determine the final temperature of the air in the tank. Also, find the amount of air added to the tank.

An insulated rigid tank having 5 kg of air at 3 atm and 30°C is connected to an air supply line at 8 atm and 50°C through a valve. The valve is now slowly opened to allow the ...Read more

Priya SinghPundit

Asked: 1 month agoIn: Chemical Engineering

Heat flow into a system is , and heat flow out of the system is ____

Heat flow into a system is ____, and heat flow out of the system is ________

VishalProfessional

Asked: 2 months agoIn: Mechanical Engineering

One kg gas is compressed adiabatically by following the law pV = C from initial temperature of 290 K. The initial pressure of gas is 1 bar. The initial and final volumes of gas are 0.50 and 0.05 respectively. Find the final temperature and pressure of gas. Assume γ =1.4.

One kg gas is compressed adiabatically by following the law pV = C from initial temperature of 290 K. The initial pressure of gas is 1 bar. The initial and final volumes ...Read more

Tuntun KumarBegginer

Asked: 2 months agoIn: Mechanical Engineering

A cylinder contains 1 m3 of gas at 100 kPa and 100°C, the gas is polytropically compressed to a volume of 0.25 m3. The final pressure is 600 kPa. Determine the (a) mass of the gas (b) value of index 'n' for compression (c) change in internal energy of the gas and (d) heat transferred by the gas during compression. Assume R = 0.287 kJ/kgK and γ = 1.4.

A cylinder contains 1 m3 of gas at 100 kPa and 100°C, the gas is polytropically compressed to a volume of 0.25 m3. The final pressure is 600 kPa. Determine the (a) mass of the gas (b) value ...Read more