Input voltage to system and the output motor speed, Electrical Engineering

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A system contains an amplifier with a gain of 10 offering the armature voltage for a motor which provides an output speed which is proportional to the armature voltage, the constant of proportionality being 5 (rev/s)/V.

What is the relationship among the input voltage to the system and the output motor speed?

Solution: The overall gain G = G₁ x G₂ = 10 x 5 = 50 (rev/s)/V.

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