__RETARDATION TEST ON SINGLE CYLINDER CI ENGINE__**AIM:**

To perform retardation test on the given single cylinder CI engine

**APPARATUS REQUIRED:**

2. Tachometer

3. Stop watch

**PROCEDURE:**

1. Engine is started and allowed to run at rated rpm in no loading conditions.

2. Fuel supply is cut off.

3. Time taken for the speed to decrease to various values is noted down.

4. Again fuel supply is given and engine is brought back to rated speed.

5. The engine load is adjusted using dynamometer to some known value

6. Fuel supply is cut-off and time taken for the speed to decrease to various values is noted down as in the no load condition

7. Curves are plotted b/w Speed and Time on no load as well as load condition

**CALCULATION OF FRICTION POWER:**

At no load condition, the torque is only due to friction

T

_{f }α ΔN/t_{1}………1 At load condition, the torque is the sum of torque due to load and friction torque

( T

_{L}+ T_{f}) α ΔN/t_{2}...…….2Where,

T

_{f }- Friction torque T

_{L }- Load torquet1 & t2 are times for decrease in Speed of ΔN from the Speed Vs Time curves on no load and on load respectively.

From equation 1 & 2,

Solving,

Therefore, Frictional Power FP =

**RESULT**

Thus the retardation test is conducted, the results are plotted and the frictional power of the engine is found.

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