IC engine and R...

An ideal petrol engine produce 0.98 kJ of work after consuming 0.070 gm of fuel. The calorific value of fuel is 43757 kJ/kg. What is the required compression ratio if specific heat air is assumed constant?

A sample of air at 35°C and standard atmospheric pressure is taken. Then sample has 70% relative humidity

If room sensible heat = 10 kW and latent heat = 70 kW, then room sensible heat factor is

The chemical formula for refrigerant R – 114 is

The compressor work in a refrigerating machine with throttle valve is 20 kJ/kg, by using expander the increase in net refrigerating effect is 3.5 kJ/kg. The percentage change in work is____

The compression ratio of air standard Otto cycle is 8. The initial conditions of air at the beginning of the compression stroke are 300K and 0.2MPa. The amount of energy added during the combustion process is 25kJ/mol.  Work done(kJ) per mole of air ____

The supply air temperature is 15˚C and apparatus dew point is 12˚C for the cooling coil with bypass factor of 0.15. What is temperature (˚C) at inlet of cooling coil?

Moist air with DBT = 40°C and relative humidity of 60 % is compressed to 5.05 bar and DBT = 150° C.

Using the following data, find the relative humidity of compressed air ______%.

R_H2O = 462 J/kg k, P_s at 40° C = 7.384 kPa, P_s at 150° C = 4.76 bar, Atm. Pressure = 1.01 bar (round off to two decimals)

Dry bulb temperature of the air is 25°C and dew point temperature at 1 atm pressure is 20°C. The saturation pressure of water at 20°C and 25°C are 0.02462 bar and 0.03813 bar respectively. The specific heat of the air and water vapour are 1.005 and 1.88 kJ/kgK respectively and latent heat of vaporization of water at 0°C is 2500 kJ/kg. The enthalpy (in J/kg) of air is

An engine based on a standard Otto cycle is operating with air as an medium with specific heat of 1.4 has a cylinder diameter of 5 cm and stroke length of 7.5 cm. If the clearance volume is 88.15 cc and the heat supplied per kg of air per cycle is 900 kJ/kg, then work output (in kJ) per kg of air is?

A car has 4 cylinder engine of 80 mm bore and 90 mm stroke, what is the clearance volume of each cylinder and the cubic capacity of engine if compression ratio is 8?

44 kg of C₃H₈ is burnt with 1160 kg of air (Mol. Wt. = 29) to produce 88 kg of CO₂ and 14 kg of CO

\({C_3}{H_8} + 5{O_2} = 3C{O_2} + 4{H_2}O\) 

What is the percent excess air used?

Air enters a duct at 15°C and 80% relative humidity and leaves at 30°C with a flow rate of 2.5 m³/s. If the air remains constant at 101.3 kPa, then the rate of heat transfer is

More test was conducted for a 2-stroke spark ignition engine having 2 – cylinders and following data is obtained. Brake power = 14 kW Brake Power of individual cylinder = 5.4 kW, 4.80 kW.

What is the mechanical efficiency of this engine?

Heat rejection factor for an ideal refrigerator working on vapor compression refrigeration cycle is 1.55. The heat absorbed in evaporator is found to be 50 kW. Keeping the heat rejection from the condenser as constant, the COP is now increased by 20 %. What will be the work done required (kW) now?