Answered: closes the valve. Input flow is not…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Question

The figure shows a simple level-control system in which a closed relay opens the valve and an open relay closes the valve. Input flow is not controlled. The level sensor has a transfer function of V_h=0.8h+0.4. The system uses 12 V supply. The relay closes at 6.4 V and opens again at 4.7 V.

a-Find the value of amplifier gain, K, required to open the valve when the level reaches 1.5 m.
b. At what level does the valve close?
c. Suppose Q₁=5 m³/min , Q2=2 m³ ⁄min and Q_out=9 m³/min (when open). What is the period of the level oscillation?

Level
Tank radius
2.0 m
sensor
Valve
Qout
K
V, = KVn
Relay
Level-Control System

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