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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Step 1 of 8

Given circuit diagram is

Step 2 of 8

Given parameters are,

,

,

Bandwidth,

,

From the given circuit we have

, and

Step 3 of 8

(a)

The Bandwidth is,

Since,,

Step 4 of 8

Time constant, 

Step 5 of 8

The RC circuit time constant is

Step 6 of 8

(b)

Step 7 of 8

(c)

Output voltage,

and

Maximum voltage gain, 

where

Step 8 of 8

The maximum gain is