The heat given to cooling medium in IC engines is about
IC engines at best can transform about 25 - 35% of chemical energy into mechanical energy. About 35% of heat generated is lost to the cooling medium, remainder being dissipated through exhaust and lubricating oil.
Gas temperature variation inside the engine cylinder during a cycle is minimum during
Which part of the piston is subjected to maximum temperature ?
Maximum temperature: At the center of piston crown.
Minimum temperature: At the bottom of oiston skirt.
The peak cylinder gas temperature is of the order of
Match List-I (Cooling system) with List-ll (Application) the following:
A. Air cooled system
B. Evaporative cooling system
C. Forced circulation cooling system
D. Thermosyphon system
1. Small output engine
2. Automobile engine
3. Small & medium sized engines
4. Stationary engin
Thermostat is used in radiators to
A thermostat prevents the circulation of water below a certain temperature through the radiator so that the water gets heated, in modern engines, a wax-element type thermostat is normally employed.
What approximate percentage of heat of combustion is lost to the jacket cooling water?
In the automobile water cooling system, the thermostat comes into operation at about
The thermostat allows the water to go to the radiator only when the water has been raised to a pre-determined temperature of about 80 - 85° C. If the temperature of water is less, it is by passed to the pump.
A fan is provided in the water cooling system to
It draws air through the spaces between the radiator tubes to bring down the water temperature appreciably.
Direct system of cooling air in one in which
It is used where plenty of water is available. The water from a storage tank is directly supplied through an inlet valve to the engine cooling water jacket. The hot water is not cooled for re-use but simply discharged. It is also known as nonreturn system.