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Tuntun KumarBegginer

Asked: 2 months agoIn: Mechanical Engineering

During the working stroke of an engine the heat transferred out of the system was 150 kJ/kg of the working substance. Determine the work done when the internal energy is decreased by 400 kJ/kg. Also state whether the work done on or by the engine.

During the working stroke of an engine the heat transferred out of the system was 150 kJ/kg of the working substance. Determine the work done when the internal energy is decreased by 400 kJ/kg. Also state whether the ...Read more

Tuntun KumarBegginer

Asked: 2 months agoIn: Mechanical Engineering

A gas whose original pressure, volume and temperature were 140 kN/m3, 0.1 m3 and 25°C respectively is compressed such that new pressure is 700 kN/m2 and its new temperature is 60°C. Determine the new volume of the gas.

A gas whose original pressure, volume and temperature were 140 kN/m3, 0.1 m3 and 25°C respectively is compressed such that new pressure is 700 kN/m2 and its new temperature is 60°C. Determine the new volume of the gas.

Anonymous

Asked: 2 months agoIn: Mechanical Engineering

A Van der Waals gas is compressed reversibly at constant temperature from volume V1 to V2. The equation of state is given by mole by p = Determine the work done per mole of the gas.

A Van der Waals gas is compressed reversibly at constant temperature from volume V1 to V2. The equation of state is given by mole by p = Determine the work done per mole of ...Read more

Tuntun KumarBegginer

Asked: 2 months agoIn: Mechanical Engineering

25 people attended a farewell party in a small room of size 10 m × 8 m and has a 5 m ceiling. Each person gives up about 350 kJ of heat per hour. Assuming the room is completely sealed off and insulated, calculate the air temperature rise occurring within 10 minutes. Assume C, of air 0.718 kJ/kgK and R = 0.287 kJ/kgK and each person occupies a volume of 0.05 m3.

25 people attended a farewell party in a small room of size 10 m × 8 m and has a 5 m ceiling. Each person gives up about 350 kJ of heat per hour. Assuming the room is ...Read more

Tuntun KumarBegginer

Asked: 2 months agoIn: Mechanical Engineering

During summer season, a room measuring 10 × 13 × 6 m3 is cooled electrically from initial temperature 28°C to 2°C. The air pressure inside the room is same as surroundings and is equal to 72 cm of Hg. The pressure remains constant during the cooling process. The cooling capacity of furniture and wall is 35 kJ/K. The specific heat of air is 1.005 kJ/kgK. Calculate the amount of electric energy needed for cooling the room. How much air comes out through gaps and windows during cooling period?

During summer season, a room measuring 10 × 13 × 6 m³ is cooled electrically from initial temperature 28°C to 2°C. The air pressure inside the room is same as surroundings and is equal to 72 cm of Hg. ...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

Tuntun KumarBegginer

Asked: 2 months agoIn: Mechanical Engineering

A paddle wheel fixed to a shaft of an engine revolves in a closed hollow vessel containing water. This closed vessel is connected freely on the shaft and restraint to its turning moment is proved by a mass attached to its side. Find the temperature rise for the following observations. Engine rpm = 650 Load applied = 60 kg at a leverage of 1.2 m Quantity of water = 200 kg Duration of test = 20 minutes

A paddle wheel fixed to a shaft of an engine revolves in a closed hollow vessel containing water. This closed vessel is connected freely on the shaft and restraint to its turning moment is proved by a mass ...Read more

Tuntun KumarBegginer

Asked: 2 months agoIn: Mechanical Engineering

The following data refer to a closed system which undergoes a thermodynamics cycle consisting of four processes. Show that the data is consistent with the first law of thermodynamics and calculate the (a) Net rate of work output as MW (b) Efficiency of the cycle.

The following data refer to a closed system which undergoes a thermodynamics cycle consisting of four processes. Show that the data is consistent with the first law of thermodynamics and calculate the (a) Net rate of work ...Read more

Tuntun KumarBegginer

Asked: 2 months agoIn: Mechanical Engineering

Calculate the distance moved by a locomotive by consuming 2 tonne of coal if 10% of the heat generated by the coal is converted into coal gas then into mechanical work. The tractive effort required is 30 N/tonne of dead mass of the locomotive where the dead mass of the locomotive is 2500 tones. Assume 1 kg of coal liberating 35000 kJ of heat on burning.

Calculate the distance moved by a locomotive by consuming 2 tonne of coal if 10% of the heat generated by the coal is converted into coal gas then into mechanical work. The tractive effort required is 30 N/tonne ...Read more

Tuntun KumarBegginer

Asked: 2 months agoIn: Mechanical Engineering

During the compression stroke of a reciprocating compressor, the work done to the air in the cylinder is 95 kJ/kg and 43 kJ/kg of heat is rejected to the surroundings. Determine the change in internal energy.

During the compression stroke of a reciprocating compressor, the work done to the air in the cylinder is 95 kJ/kg and 43 kJ/kg of heat is rejected to the surroundings. Determine the change in internal energy.