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Electrical Machines Lab Experiments

To verify the law of moments by rotating disc apparatus.



Aim

To verify the law of moments by rotating disc apparatus.

Theory:

As per this law we can say that if a number of coplanar forces acting on a rigid body which is in equilibrium then the algebraic sum of the moments of all forces about any point in their plane is zero.

Apparatus Used:

  1. Rotating disc apparatus
  2. Sets of weights
  3. Scale
apparatus

Procedure:

  1. Put weights in the two pans and note down W1 and W2.
  2. Note down the distance d1 and d, on the scale and enter in table.
  3. Take different sets of reading by changing the position of pins &find out the value of both the moments.
  4. Calculate the percentage error.
  5. What is the principle of moment

Observations and Calculations:

Radius of flywheel axle (r) =……….cm

S.no Weight W1 Distance from centre d1 Weight W2 Distance from centre d2 M1 = W1 d1 M2 = W2 d2
1
2
3
4
5
6

Result:The average percentage error is =……………………

Precautions:

  1. Note down the distance carefully
  2. Place the Weights gently.
  3. Lubrication should be done.

Viva Questions:

1.What are the conditions of equilibrium?

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Q.-2. Define Force.

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Q.-3.Define moment.

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Q.-4.Define couple

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Q.-5.Define Force, moment, and couple

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Q.-6.State the conditions of equilibrium.

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Q.-7. State the types of equilibrium

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Q.-8.Distinguish between moment and couple

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