Pneumatic Control Systems
With reference to air compressors and pneumatic control systems:
(a) state ONE advantage and ONE disadvantage of a compressed air system compared to a hydraulic system;(2)
(b) explain why it is desirable to remove moisture from the air;(2)
(c) explain why its desirable to limit oil carry over;(2)
d) describe how EACH of the following is achieved:
(i) removal of moisture from the air;(2)
(ii) limiting of oil carry over.(2)
1.Quiz. Study Notes
With reference to using air as a pneumatic medium:
(a) state FOUR advantages;(4)
(b) state, with reasons, THREE disadvantages.(6)
2.Quiz. Study Notes
With reference to accumulators in pneumatic control systems:
(a) state the TWO main purposes;(2)
(b) explain why EACH of the purposes stated in part (a) are required.(8)
3.Quiz. Study Notes
With reference to pneumatic control systems, explain EACH of the following:
(a) why moisture is undesirable;(4)
(b) why oil is generally undesirable;(3)
(c) why oil may be intentionally introduced into parts of the system.(3)
4.Quiz. Study Notes
With reference to an air supply for pneumatic control systems:
(a) state THREE contaminants that may be present;(3)
(b) explain why the contaminants stated in part (a) are undesirable.(7)
5.Quiz. Study Notes
With reference to pneumatic control systems, explain EACH of the following:
(a) why having a supply of clean dry air is important;(5)
(b) how a supply of clean dry air is achieved.(5)
6.Quiz. Study Notes
Describe TWO methods of drying compressed air for use in a pneumatic control system.(10)
7.Quiz. Study Notes
Describe, with the aid of a sketch, a pressure reducing valve suitable for supplying control air from the main starting air supply.(10)
8.Quiz. Study Notes
With reference to control systems:
(a) state FIVE advantages of using pneumatics;(5)
(b) state FIVE advantages of using hydraulics.(5)
9.Quiz. Study Notes