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CORK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 2 Examinations 2012
Module Title: Industrial Electronics 2
Module Code: ELEC 6025
School: Mechanical, Electrical and Process Engineering
Programme Title: Bachelor of Engineering in Electrical Engineering – Stage 1 Bachelor of Engineering (Honours) in Electrical Power Systems – Year 1
Programme Code: EELEC_7_Y EEPSY_8_Y
External Examiner(s): Ms Mary Desmond, Mr Colm Murray Internal Examiner(s): Dr. Pascal O’Connor
Instructions: Answer THREE questions. All formula for calculations must be shown.
Duration: 2 Hours
Sitting: Summer 2012
Requirements for this examination:
Note to Candidates: Please check the Programme Title and the Module Title to ensure that you have received the correct examination paper. If in doubt please contact an Invigilator.
Q1. (a) Fig.Q1(a) shows a logic circuit with three inputs (A,B,C) and one output Z (a Lamp).
(i) Develop a Truth Table for this circuit. (ii) Derive a Boolean expression for the output Z. (iii) Simplify this expression and state the input conditions necessary for the Lamp ON mode. (12 Marks)
Fig.Q1(a)
(b) An experiment is controlled by four logic signals, A, B, C and D, which make up the data-word ABCD. A control line (Q) is required which is set High only if this data-word takes on the equivalent decimal values 1, 2, 4, 8.
(i) Develop a Truth-Table for this function, Q. (ii) Extract a Boolean equation from the truth-table. (iii) Simplify or Minimise this equation, if possible. (iv) Implement the equation in (iii) using AND-OR configuration. (v) Implement the equation in (iii) using a configuration with XOR gates. (21 Marks)
Q3. (a) Construct a Truth-Table for the logical functions at points X, Y and Z in Fig.Q3(a). (i) Draw a Truth-Table for points X, Y and Z (ii) State the equations for X, Y and Z. (iii) Identify a single logic gate that can be used to replace the whole circuit. (12 Marks)
Fig.Q3(a)
(b) Find a Boolean expression/equation for the output Z of Fig.3(b). Simplify it and draw the simplified logic diagram. Develop the Truth-Table for Fig.3(b) and compare it to your Boolean equation.
Fig.Q3(b) (12 Marks)
(c) A logical circuit is shown in Fig.3(c). Explain its operation and state what it could be used as.
Fig.Q3(c) (9 Marks)
Q4. (a) For the diagram shown in Fig.Q4(a), calculate all the currents and voltages around the circuit for R 2 = 5kΩ, (assume βDC = hFE = 50 ; the ON-mode for the 2V LED is ; Iz(MIN) = 1mA for Zener diode). Is the LED ON? (Outline any assumptions you make.) (20 Marks)
Fig.Q4(a)
(b) If R 2 is reduced to 1kΩ, what effect, if any does this have on the circuit? (recalculations must be provided.) (13 Marks)
