Btec engineering level 3 assignments answers

Centre No: 04943

Technical Education Centre for Online Learning

Assignment Brief

Programme Title:

BTEC Level 3 Award/Cert/Dip in Engineering

Programme No:

L3E-

Unit Number and Title:

Unit 4: Principles and Applications of Electronic Devices and Systems

Edexcel Unit Code:

K/600/0300

Coursework Title:

Device theory and circuit simulation

Coursework Number:

A1 (of 2)

Date issued

Final deadline

(5 weeks)

Student Name

Assessor

G Tweed

Task No

Assessment criteria covered

Date Achieved

Feedback

1st

Attempt

2nd Attempt*

Comment

Attached?

Grading criteria: P1, P2, P3, P7, P8, D1

1

P1: Explain the purpose of two different types of diode, each

in a different electronic circuit application

2

P2: Explain the operation of two different types of transistor,

one in an analogue and one in a digital circuit

3

P3: Explain the operation of three different logic gates with

appropriate gate symbols, truth tables and Boolean

expressions

4

P7: Use a computer software package to simulate the construction and testing of an analogue circuit with three different types of components

5

P8: Use a computer software package to simulate the construction and testing of a digital logic circuit with three gates.

6

D1: Using a simulation package, analyse the effects of changing the values of circuit parameters on the performance of an analogue circuit containing an operational amplifier or transistors

Scenario: You are starting out as an apprentice technician where you need to understand a range of electronic circuits. You have been asked to explain these and to use a computer simulation package such as Yenka to build and test different types of analogue and digital circuits.

Evidence you must produce for this assignment: Written report with appropriate calculations. Also a copy of computer circuit simulator files.

Sources of information: Unit 4 course notes sections 1 and 2.

Bishop O, Electronics - A first course (Newnes/Elsevier 2006) ISBN: 0-7506-6960-3

Bishop O, Electronics – Circuits and Systems (Newnes/Elsevier 2003) ISBN: 0-7506-5845-2

*Re-submission Conditions: Only one opportunity to re-submit work will be allowed for each task. All three of the conditions below must be met if this is to be allowed: These are that:

· You have met the original ‘deadline’ date or agreed extension date. The normal extension on receipt of approved extenuating circumstances will be 5 days

· Your tutor judges that you will be able to provide improved evidence without further guidance

· Your tutor can be sure that the evidence submitted is your own work, and that you have signed a declaration of authenticity declaring that it is your own work.

A resubmission date will be set for 10 working days after the assessment has been returned to you.

Coursework

Internal Verifier : Sign

(WWatson)

30/10/14

Assessment Submission and Declaration

Please list the evidence submitted for each task. Indicate the page numbers where the evidence can be found or describe the nature of the evidence (e.g. written report, calculation, file name).

Task /

Criteria ref.

Evidence submitted

Task /

Criteria ref.

Evidence submitted

Additional comments to the Assessor:

Student Declaration on Submission

I confirm that all the work in this coursework is my own.

Student Signature.

Date.

General Feedback by Tutor

Sampled by IV: Sign

Date:

Tasks for Assessment 1

All answers must be your own worK

Note: Copy and paste these cover and task sheets to the front of your written work as you must sign (electronic signature) and date these in order to have your assessment marked and graded

Task 1 [P1]

(a) State the two types of diodes being utilised in the schematic diagram shown below

(b) Explain the application of each diode in the above diagram

(c) With the use of diagrams/graphs explain the operation of each diode

Task 2 [P2]

(a) With the aid of diagrams/graphs explain the operation of the transistor in the diagram shown below.

(b) From diagram shown below, state the name of the circuit and explain how it operates including the purpose of the resistors.

Task 2 (contd.)

(c) With the aid of diagrams/graphs explain the operation of the transistor in the diagram shown below.

(d) From the diagram shown below, state the name of the circuit and explain how it operates including the purpose of the resistors.

Task 3 [P3]

(a) Identify and explain the operation of 3 logic gates shown in the diagram below including their truth tables

(b) From the diagram shown below, explain how it operates by giving the truth table and Boolean expression at each stage marked with a box

Task 4 [P7]

(a) Use a computer simulation package such as Yenka to build the BJT (BC108) amplifier circuit, with an AC input sine wave Vi = 50 mV @ 1 kHz and DC blocking capacitor C = 10µF, as shown below:

(b) Using the simulator’s Oscilloscope or Graph function to display and measure the gain Av of the amplifier. Clearly show both Vi and Vo on your graph. Indicate the X (time) and Y (voltage) scales used.

(c) Confirm your measurement by also calculating the gain for the circuit.

(d) Briefly explain the role of each component in your circuit (150-200 words)

(e) As part of your evidence, print-screen a copy of your computer based circuit layout and graph. Save your simulator file as ‘U4A2T1_amp1’ and attach a copy.

Task 5 [D1]

(a) Modify the circuit in Task 4 to achieve a gain of 10 with an AC input Vi =10mV @1 KHz. Save your simulator file as ‘U4A2T2_amp2’ and attach a copy.

(b) Modify the circuit in Task 5a to find the maximum (i.e. open) gain of the BJT amplifier. Save your simulator file as ‘U4A2T2_amp3’ and attach a copy.

(c) Show evidence of using the simulator’s Oscilloscope or Graph function, by displaying and measuring the gain Av of the amplifier for both task parts.

(d) As part of your evidence, print-screen copies of your computer based circuit layouts and graphs.

Task 6 [P8]

A logic system is required that will sound a buzzer if the conditions within a PCB etching tank are incorrect. The buzzer must operate if the state of three sensors is as follows:

· Sensor A is ON and B is ON but C is OFF

· Sensor A is ON but B and C are both OFF

· Sensor B is ON but A and C are both OFF

· Sensors B and C are both ON but A is OFF

Under all other conditions the buzzer must not operate.

a) Complete the truth table for the above conditions

Inputs

A

B

C

Q(Buzzer)

0

0

0

0

0

1

0

1

0

0

1

1

1

0

0

1

0

1

1

1

0

1

1

1

b) Derive the Boolean Expression for the Truth Table shown above and draw the circuit required to implement the Boolean expression.

c) Use a computer simulation package such as Yenka to build your design, with the logic latch switches and indicators connected for each combination of inputs which can verify your design.

d) Briefly explain the role of each component in your circuit (150-200 words)

e) As part of your evidence, print-screen a copy of your computer based circuit layout. Save your simulator file as ‘U4A2T3_logic1’ and attach a copy.

Assessment A1

S

W

1

R

4

R

2

B

C

1

0

8

R

1

R

3

9

V

0

V

L

E

D