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Page 1 of 3 MECH 6017
CORK INSTITUTE OF TECHNOLOGY INSTITIÚID TEICNEOLAÍOCHTA CHORCAÍ
Semester 1 Examinations 2007/08
Module Title: Mechatronics I
Module Code: MECH 6017 School: Mechanical and Process Engineering Programme Title: Bachelor of Engineeringin Mechanical Engineering – Year 1 Programme Code: EMECH_7_Y1 External Examiner(s): Mr. Alan Bateman Dr. Patrick Delassus Internal Examiner(s): Mr. Sean Williams Instructions: Candidates are required to answer three from four questionsin the
time allowed Duration: 2 Hours Sitting: Winter 2007 Requirements for this examination:Note to Candidates: Please check the Programme Title and the Module Title to ensure that you are attempting the correct examination paper. If in doubt please contact an Invigilator.
Page 2 of 3 MECH 6017
a) List the disadvantages associated with pneumatics. (6 marks)
b) Draw a pneumatic circuit diagram which illustrates the correct method of
circuit layout. (8 marks)
c) Explain the function undertaken by each pneumatic component illustrated in the
circuit drawn for part (b). (8 marks)
d) Show with the aid of diagrams how the following valves function:
1. Quick Exhaust valve 2. Pressure relief valve
a) State the rules associated with constructing cascading circuits. (8 marks)
b) Design and draw an appropriate circuit diagram which illustrates the following cylinder sequence:
Use correct pneumatic symbols and associated notation in your solution. (17 marks)
c) A problem has arisen in the sequence above. The first stage of cylinder movement
(A+) takes place, but stage two (B+) does not. List possible problems and suggest a solution for each problem identified.
Page 3 of 3 MECH 6017
a) Explain the term “pilot operated signal”. (4 marks)
b) Sketch the cross section of a single acting spring return cylinder.
(15 marks) c) From the diagram in part (c) identify the types of seals found and highlight their
function. (6 marks)
d) Calculate the volume of air consumed by a single acting cylinder which has a
stroke length of 60mm and a piston diameter of 25mm. Gauge pressure associated with the pneumatic circuit is 1.5 bar and the cylinder operates at 10 cycles per minute.
(8 marks) Q4.
a) Draw the following pneumatic symbols in accordance with British Standards 2917.
i. Double Acting Cylinder with single adjustable cushioning
ii. 5/2 Directional Control Valve iii. Throttle valve and non-return valve
(b) List safety procedures associated with pneumatic systems. (8 marks)
(c) Draw a circuit based upon the logic “OR” valve (shuttle valve), also show the approriate truth table.
d) Explain the difference between sequential and cascading in relation to multi- cylinder pneumatic circuit design.