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RK INSTITUTE OF TECHNOLOGY
INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 1 Examinations 2008/
Module Title: Mechatronics System Design
Module Code: MECH 8014
School: Mechanical and Process Engineering
Programme Title: Bachelor of Engineering (Honours) in Mechanical Engineering – Award
Programme Code: EMECH_8_Y EBIOM_8_Y
External Examiner(s): Prof. Robin Clarke, Mr. Peter Clarke, Mr. Murtagh Murphy Dr. David Fitzpatrick Internal Examiner(s): Dr. Michael J. O’Mahony
Instructions: Attempt 3 questions All questions carry equal marks
Duration: 2 H ours
Sitting: Winter 2008
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.
- (a) Using Karnaugh maps, or otherwise, reduce the following switching functions to their simplest sum-of-products form:
1
2
G
G
A B C D A B C AC D A BD A B C B C D B C D
X Y Z X YZ Y Z X Y Z
−
(8 Marks)
(b) The switching function below is expressed as a sum of its minterms. Reduce the function to its simplest form using a Karnaugh map.
X indicates a “don’t care” condition. (8 Marks)
(c) A computer interface to a line printer has seven data lines that control the movement of the paper and the print head and determine which character to print. The data lines are labelled A, B, C, D, E, F and G, and each represents a binary 0 or 1. When the data lines are interpreted as a 7-bit binary number with line A being the most significant bit, the data lines can represent numbers 0 to 127 10. The number 13 10 is the command to return the print head to the beginning of a line, the number 10 10 means to advance the paper by one line, and the number 32 10 to 127 10 represent printing characters.
(i) Write an equation for the variable X which is 1 iff the data lines indicate a command to return the print head to the beginning of the line. (5 Marks) (ii) Write an equation for the variable Y which is 1 iff there is an advance paper command on the data lines. (6 Marks)
(iii) Write an equation for the variable Z which is 1 iff the data lines indicate a printable character. ( Hint : Consider the binary representation of the numbers 0 – 31 and 32 – 127 and write the equation for Z with only two terms) (6 Marks)
1
1
F W X Y Z 1 4 5 9 10 1112 13^ 2 6 14
X
- (i) State the properties of an ideal op-amp. (13 Marks)
Figure 4
(i) Derive the relationship between the input voltages v 1 , vi2 and the output voltage v (^) o in the op-amp circuit shown in figure 4 as a function of R1, R2, R 3 and R4. (20 Marks)
- Write detailed notes on any THREE of the following:
(i) The effect of amplifier input and output impedance on input and output loading errors. Use Figure 5 (i) as a guide.
(ii) Embedded controller versus nonembedded computer.
(iii) Applications where microcontrollers have enhanced or replaced the mechanical and analog components of a design.
(iv) Stepper Motor Operation and Control.
(v) Pulse width Modulation (PWM) control of DC motors.
Figure 2
Figure 5 (i)
