thermodynamics Archives - Page 9 of 9

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Mazurek GravityPundit

Asked: 2 months agoIn: Mechanical Engineering

A Spark Ignition 2-stroke engine produces 28 kW and 43.6 kW of frictional power. The air consumption of this engine is 0.0556 kg/s and works with 1:10 of fuel-air ratio. The heating value of the fuel is 42000 kJ/kg. Calculate the fuel consumption, indicated thermal efficiency, brake thermal efficiency, brake specific fuel consumption and indicated specific fuel consumption.

A Spark Ignition 2-stroke engine produces 28 kW and 43.6 kW of frictional power. The air consumption of this engine is 0.0556 kg/s and works with 1:10 of fuel-air ratio. The heating value of the fuel is 42000 ...Read more

VishalProfessional

Asked: 2 months agoIn: Mechanical Engineering

A two-stroke CI engine develops a brake power of 368 kW while its frictional power is 73.6 kW. Its fuel consumption is 180 kg/h and works with an air-fuel ratio of 20:1. The heating value of teh fuel is 42000 kJ/kg. Calculate (i) indicated power (ii) mechanical efficiency (iii) air consumption per hour (iv) indicated thermal efficiency and (v) brake thermal efficiency.

A two-stroke CI engine develops a brake power of 368 kW while its frictional power is 73.6 kW. Its fuel consumption is 180 kg/h and works with an air-fuel ratio of 20:1. The heating value of teh fuel ...Read more

VishalProfessional

Asked: 2 months agoIn: Mechanical Engineering

Isentropic nozzle heat drop 185 kj/kg, reheat of steam due to blade friction 10% of isentropic heat drop. Nozzle angle 20, ratio of blade speed to whirl component of steam speed is 0.5, velocity coefficient for blade 0.95. you may assume that steam at entry to nozzle has a velocity of 30 m/s. Find the blade angles so that steam enter them without shock and leave them in an axial direction. Also find work output.

Isentropic nozzle heat drop 185 kj/kg, reheat of steam due to blade friction 10% of isentropic heat drop. Nozzle angle 20, ...Read more

VishalProfessional

Asked: 2 months agoIn: Mechanical Engineering

A vessel contains 4 kg of air at a pressure of 600 kPa and a temperature of 40°C. The vessel is connected to another by a short pipe and the air exhausts into it. The final pressure in both vessels is 250 kPa and the temperature in both is 15°C. If the pressure in the second vessel before the air entered was zero, determine the volume of each vessel. Assume R for air is 287 J/(kg K).

A vessel contains 4 kg of air at a pressure of 600 kPa and a temperature of 40°C. The vessel is connected to another by a short pipe and the air exhausts into it. The final pressure in ...Read more

VishalProfessional

Asked: 2 months agoIn: Mechanical Engineering

A compressed air cylinder has a volume of 0.6 m³ and contains air at a pressure of 1.2 MPa absolute and a temperature of 37°C. After use the pressure is 800 kPa absolute and the temperature is 17°C. Calculate (a) the mass of air removed from the cylinder, and (b) the volume the mass of air removed would occupy at STP conditions. Take R for air as 287 J/(kg K) and atmospheric pressure as 100 kPa.

A compressed air cylinder has a volume of 0.6 m³ and contains air at a pressure of 1.2 MPa absolute and a temperature of 37°C. After use the pressure is 800 kPa absolute and the temperature is 17°C. ...Read more

VishalProfessional

Asked: 2 months agoIn: Mechanical Engineering

A gas is contained in a vessel of volume 0.02 m³ at a pressure of 300 kPa and a temperature of 15°C. The gas is passed into a vessel of volume 0.015 m³. Determine to what temperature the gas must be cooled for the pressure to remain the same.

A gas is contained in a vessel of volume 0.02 m³ at a pressure of 300 kPa and a temperature of 15°C. The gas is passed into a vessel of volume 0.015 m³. Determine to what temperature the ...Read more

VishalProfessional

Asked: 2 months agoIn: Mechanical Engineering

During testing of single cylinder two-stroke petrol engine following data were obtained. Brake torque = 640 Nm, cylinder diameter 21 cm, speed 350 rpm, stroke length = 28 cm, mean effective pressure = 5.6 bar, oil consumption = 8.16 kg/h, calorific value of the fuel = 42,705 kJ/kg. Determine: (i) mechanical efficiency, (ii) Indicated thermal efficiency, (iii) Brake thermal efficiency, and (iv) brake specific fuel consumption.

During testing of single cylinder two-stroke petrol engine following data were obtained. Brake torque = 640 Nm, cylinder diameter 21 cm, speed 350 rpm, stroke length = 28 cm, mean effective pressure = 5.6 bar, oil consumption = ...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

VishalProfessional

Asked: 3 months agoIn: Mechanical Engineering

0.3 Kg of Nitrogen gas at 100 kPa and 40°C is contained in a cylinder. The piston is moved compressing nitrogen until the pressure becomes 1 MPa and temperature becomes 160°C. The work done during the process is 30 kJ. Calculate the heat transferred from the nitrogen to the surroundings. Cv for Nitrogen = 0.75 kJ/kg-K.

0.3 Kg of Nitrogen gas at 100 kPa and 40°C is contained in a cylinder. The piston is moved compressing nitrogen until the pressure becomes 1 MPa and temperature becomes 160°C. The work done during the process is ...Read more