Question: A 250-V, 4-pole, wave-wound d.c. series motor has 782 conductors on itsarmature. It has armature and series field resistance of 0.75 ohm. The motor takesa current of 40 A. Estimate its speed and gross torque developed if it has a flux per pole of 25 mWb Answer: Step 1 Mechanical Engineering homework question answer, step 1, image 1 Mechanical Engineering homework question answer, step 1, image 2 Step 2 Mechanical Engineering homework question answer, step 2, image 1 Step 3 Mechanical Engineering homework question answer, step 3, image 1

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Question:

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Answer:

Step 1

The free body diagram of the section ADEB is,

Here, P is the effective loading due to the UDL. H and V are the subscript for the horizontal and vertical reaction at A respectively.

Step 2

Calculate the value of effective loading due to the UDL, P,

Consider the angle B as θ and apply the condition for the equilibrium of moment about support A.

Step 3

Apply the condition for the equilibrium of forces along the vertical direction.

Step 4

Similarly, apply the condition for the equilibrium of forces along the horizontal direction.

Step 5

Consider the FBD of the section AD of the beam,

Calculate the effective load due to UDL, PAD  acting on AD,

Step 6

Apply the condition for the equilibrium of forces along the vertical direction for the section AD.

This the vertical reaction at point D.

Step 7

Apply the condition for the equilibrium of forces along the horizontal direction for the section AD.

This the horizontal reaction at point D.

Step 8

Now, apply the condition for the equilibrium of moment about point D.