Posted: April 24th, 2025

Engineering – Mechanical Engineering Automation assignment

I have failed in this subject and have to redo the assignment part 1 & 2 as per attachment, I’m doing diploma currently and need your support to pass

MODULE TITLE : CONTROL SYSTEMS AND AUTOMATION

TOPIC TITLE : BASIC PRINCIPLES AND CONTROL

ACTIONS

TUTOR MARKED ASSIGNMENT

NAME………………………………………………………………………………………………………………………

ADDRESS …………………………………………………………………………………………………………………

…………………………………………………………………………………………………………………………………

……………………………………………… HOME TELEPHONE ……………………………………………..

EMPLOYER………………………………………………………………………………………………………………

…………………………………………………………………………………………………………………………………

……………………………………………… WORK TELEPHONE………………………………………………

CSA – 1 – TMA (v2.1)

THIS BOX MUST BE COMPLETED

Student Code No. ……………………………………………………………………………………….

Student’s Signature ……………………………………………………………………………………..

Date Submitted …………………………………………………………………………………………..

Contact e-mail ……………………………………………………………………………………………

Published by Teesside University Open Learning (Engineering)

School of Computing, Engineering and Digital Technologies

Teesside University

Tees Valley, UK

TS1 3BA

+44 (0)164

3427

retrieval system, or transmitted, in any form or by any means, electronic, mechanical,

photocopying, recording or otherwise without the prior permission

of the Copyright owner.

This book is sold subject to the condition that it shall not, by way of trade or

otherwise, be lent, re-sold, hired out or otherwise circulated without the publisher’s

prior consent in any form of binding or cover other than that in which it is

published and without a similar condition including this

condition being imposed on the subsequent purchaser.

Before you start please read the following instructions carefully.

1. This assignment forms part of the formal assessment for this

module.

2. You should therefore not submit the assignment until you are

reasonably sure that you have completed it successfully. Seek your tutor’s

advice if unsure.

3. Ensure that you indicate the number of the question you are answering.

4. Make a copy of your answers before submitting the assignment.

5. Complete all details on the front page of this TMA and return it with the

completed assignment including supporting calculations where

appropriate. The preferred submission is via your TUOL(E) Blackboard

account:

https://eat.tees.ac.uk

6. Your tutor’s comments on the assignment will be posted on Blackboard.

IMPORTANT

1. Choose a simple single control loop used on a process you are familiar

with (it could be domestic or industrial).

(a) Explain why the control is necessary.

(b) Write a description of the control system.

(d) Draw a block diagram of the control system.

(e) State the type(s) of signal used in the process.

(f) State whether the control is open or closed loop, feed forward or

feedback.

(g) State and describe the sensor used for measuring the process variable

to be controlled.

2. The curve in FIGURE 1 shows the response of a bare thermocouple

which has been subjected to a step change in temperature from 50°C to

10°C. Assuming that the bare thermocouple behaves as a single

transfer lag system, determine the mathematical relationship between the

temperature (T) and time (t) [i.e. determine the equation relating T to t].

FIG. 1

0 2 4

8 10 12

Time, ts

14 16 18 20

T
em

p
er

a
tu

re
,
T
C

3. FIGURE 3 shows an open loop system containing a distance velocity lag

and a single transfer lag.

FIG. 3

If the system input xi is subjected to a step disturbance from 2 units to 12

units, plot the response of xo on a base of time. Determine graphically, and

verify mathematically, the time taken for the output to change by 4 units.

xi xo
Single

transfer lag of  = 5s
4.0s

Distance –
velocity lag of

4. FIGURE

shows an electrically heated oven and its associated control

circuitry. The current, I, to the oven’s heating element is fed from a

voltage-controlled power amplifier such that I = K1. A voltage, VD, derived

from a potentiometer, sets the desired oven temperature, TD. The oven

temperature is measured using a thermocouple that, for simplicity, is

assumed to generate a constant emf of 10 V per degree Celsius. The effect

of the ambient temperature is ignored.

12 V

 = VD – VM

Power
supply

I = k1

Heater

Oven

Thermocouple

VM = k2Vt

FIG.

Vt = ktTO

Power
amplifier

Voltage
amplifier

TO = kOI

(a) Represent the arrangement by a conventional control-system block

diagram. Identify the following elements in the block diagram:

input; error detector (comparator); controller; controlled

element; detecting element and feedback loop.

(b) Derive an expression for the transfer function of the system, in terms

of the system parameters k1, k2, kO and kt.

when the potentiometer is at its mid-point.

PARAMETER VALUE

kt
10 V/°C

kO 6.9 °C/A

k1 6 A/V

k2 2400

TABLE A

5. The proportional control system of FIGURE 3(a) has an input, 1, of

10 units. The uncontrolled input, 2, has a value of 50 units, prior to a

step change down to 40 units. The result of this disturbance upon the

output, o, is shown in FIGURE 3(b).

(a) Calculate the change in offset in the output produced by the step

change.

(b) Draw a modified block diagram to show how the offset could be

minimised by the inclusion of another control action. Also, show by

means of a sketch how the modification might be expected to affect

the output response.

the disturbance could be minimised by the inclusion of a third type of

control action.





Fig 3 (a)

o

0 10 20 30 40 50 60

Time (minutes)

Fig 3 (b)

6. (a) FIGURE 5 shows the input and output waveforms for a

proportional plus integral controller. State:

(i) the controller’s proportional gain

(ii) the controller’s integral action time

Fig 5

(b) FIGURE 6 shows a proportional plus derivative controller that has a

proportional band of 20% and a derivative action time of 0.1 minutes.

Construct the shape of the output waveform for the triangular input

waveform shown, if the input rises and falls at the rate of 4 units per

minute.

Fig 6

Question

No.

MODULE TITLE : CONTROL SYSTEMS AND AUTOMATION

TOPIC TITLE : MODELLING OF PROCESSES AND

CONTROL DEVICES AND SYSTEMS

TUTOR MARKED ASSIGNMENT

NAME……………………………………………………………………………………………………………………….

ADDRESS …………………………………………………………………………………………………………………

…………………………………………………………………………………………………………………………………

……………………………………………… HOME TELEPHONE ……………………………………………..

EMPLOYER………………………………………………………………………………………………………………

…………………………………………………………………………………………………………………………………

……………………………………………… WORK TELEPHONE………………………………………………

CSA – 2 – TMA (v2.2)

THIS BOX MUST BE COMPLETED

Student Code No. ……………………………………………………………………………………….

Student’s Signature ……………………………………………………………………………………..

Date Submitted …………………………………………………………………………………………..

Contact e-mail ……………………………………………………………………………………………

Published by Teesside University Open Learning (Engineering)

School of Computing, Engineering and Digital Technologies

Teesside University

Tees Valley, UK

TS1 3BA

+44 (0)1642 342740

retrieval system, or transmitted, in any form or by any means, electronic, mechanical,

photocopying, recording or otherwise without the prior permission

of the Copyright owner.

This book is sold subject to the condition that it shall not, by way of trade or

otherwise, be lent, re-sold, hired out or otherwise circulated without the publisher’s

prior consent in any form of binding or cover other than that in which it is

published and without a similar condition including this

condition being imposed on the subsequent purchaser.

Before you start please read the following instructions carefully.

1. This assignment forms part of the formal assessment for this module. If you

fail to reach the required standard for the assignment then you will be

allowed to resubmit but a resubmission will only be eligible for a Pass

grade, not a Merit or Distinction.

You should therefore not submit the assignment until you are reasonably

sure that you have completed it successfully. Seek your tutor’s advice if

unsure.

2. Ensure that you indicate the number of the question you are answering.

3. Make a copy of your answers before submitting the assignment.

4. Complete all details on the front page of this TMA and return it with the

completed assignment including supporting calculations where

appropriate. The preferred submission is via your TUOL(E) Blackboard

account:

https://eat.tees.ac.uk

5. Your tutor’s comments on the assignment will be posted on Blackboard.

IMPORTANT

1. A steady state distillation process is shown diagrammatically as

FIGURE 1.

s
u
p
p
l
i
e
d
t
o
b
o
i
l
e
r

FIG. 1

4 



Assuming no heat losses to the atmosphere:

(i) Write four balanced equations for this system.

(ii) Identify where any. constitutive equations may be required for the

modelling processes

2. A process can be represented by the first order equation

dyt 
dt

y t   3u t 



Assume the initial state is steady (y = 0 at t = –0).

(a) Determine the transfer function of this process in the s domain.

(b) If the input is a ramp change in u(t) = 4t, determine the value of y(t)

when t = 10 s.

3. Using a simulator of your own choice, or the one used during the lessons

at the website;

http://newton.ex.ac.uk/teaching/CDHW/Feedback/OvSimForm-gen.html

note the initial values used by the simulator and the output produced.

For BOTH ON-OFF and PID control,

(a) sketch (or print copies) of the effect of changing the following

parameters from their existing value (resetting them to the original

after every change has been recorded):

(i) Increasing the proportional control by a factor of 10.

(ii) Decreasing proportional control by a factor of 10.

(iii) Increasing the integral control by a factor of 10.

(iv) Decreasing integral control by a factor of 10.

(v) Increasing the derivative control by a factor of 10.

(vi) Decreasing derivative control by a factor of 10.

(vii) Increasing the hysteresis by a factor of 10.

(viii) Decreasing hysteresis by a factor of 10.

(ix) Increasing the system lag by a factor of 10.

(x) Decreasing system lag by a factor of 10.

(b) Explain your results.

http://newton.ex.ac.uk/teaching/CDHW/Feedback/OvSimForm-gen.html

4. The purpose of the arrangement shown in FIGURE 4 is to

mix the two liquid products A and B in a fixed mass ratio.

Product A, which is itself a mixture, is a ‘wild’ flow, whilst

product B, a pure compound, is controlled. As the mixture

leaves the tank the transmitter TX measures its density.

(a) Complete the diagram to show how the arrangement

could be controlled by the method of ‘variable ratio

control’.

(b) Identify which transmitter provides ‘feedforward’.

disturbance caused by a variation in the density of

product A.

Fig 4

5. FIGURE 5 shows a partially completed diagram of a flow

control system. The flow controller is reverse acting and

has a 0.2 to 1.0 bar pneumatic output signal which will

supply both control valves V1 and V2.

The small range control valve, V2, only needs to operate on the

first 25% output change of the controller output signal. For

larger flow rates the small range valve will remain fully open

and control will be achieved by operation of the large range

valve. Note the differing air failure action of the two valves.

Fig 5

Design a system utilising valve positioners which will meet the prestated

specifications.

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