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:

For the output stage shown in (Figure 1), the transistors parameters are:
npn BJT’s : β = 150 &VA=100 V
pnp BJT’s : β = 50 &VA=60 V
a) Draw the transfer C/Cs for (R2 large resistor) and (R2 small resistor).
b) Calculate R2 so that the maximum output limit = 8 V.
c) Calculate the maximum efficiency corresponding to part – b

assume it's a sinusoidal signal

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Answer: