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Machine Systems Exam: Pneumatics & Hydraulics - Higher Cert. in Mechanical Engineering, Exams of Machine Design

Aligarh Muslim UniversityMachine Design

A past exam paper from the machine systems module of the higher certificate in engineering in mechanical engineering program at cork institute of technology. The exam covers topics related to pneumatics and hydraulics, including applications, limitations, boyle's law, pressure, two-stage compression, screw compressors, air distribution systems, pipe sizing, frl, quick exhaust valves, pneumatic and hydraulic cylinders, and hydraulic external gear pumps.

Typology: Exams

2012/2013

Uploaded on 03/28/2013

kirann
kirann 🇮🇳

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Cork Institute of Technology
Higher Certificate in Engineering in Mechanical Engineering - Stage 1
(National Certificate in Engineering in Mechanical Engineering – Stage 1)
(NFQ – Level 6)
Autumn 2005
Machine Systems (Pneumatics & Hydraulics)
(Time: 2.5 Hours)
Instructions: Examiners:
Answer four questions. Mr. Sean Williams
All questions carry equal marks. Mr. Manfred Uhlemann
Mr. J. Connolly
Mr. R. Simpson
Q1. (a) List five pneumatic industrial applications. (5 marks)
(b) State and explain four limitations associated with pneumatic systems. (6 marks)
(c) Give, in your own words, an interpretation of Boyles Law.
Use sketches if necessary. (8 marks)
(d) Define the term “pressure” and state the units it’s measured in. (6 marks)
Q2. (a) Define the term “two-stage compression.” (4
marks)
(b) Describe using diagrams the operation of the screw compressor. (7 marks)
(c) Explain using diagrams the features installed in an air distribution system to remove
moisture. (8 marks)
(d) Find the pipe size to carry an air flow rate of 10 litres/s at a velocity of 10 m/s.
Note: Refer to table 3 (outline of pipe dimensions). (6 marks)
pf3
pf4
pf5

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Higher Certificate in Engineering in Mechanical Engineering - Stage 1

(National Certificate in Engineering in Mechanical Engineering – Stage 1)

(NFQ – Level 6)

Autumn 2005

Machine Systems (Pneumatics & Hydraulics)

(Time: 2.5 Hours)

Instructions: Examiners: Answer four questions. Mr. Sean Williams All questions carry equal marks. Mr. Manfred Uhlemann Mr. J. Connolly Mr. R. Simpson

Q1. (a) List five pneumatic industrial applications. (5 marks) (b) State and explain four limitations associated with pneumatic systems. (6 marks) (c) Give, in your own words, an interpretation of Boyles Law. Use sketches if necessary. (8 marks) (d) Define the term “pressure” and state the units it’s measured in. (6 marks)

Q2. (a) Define the term “two-stage compression.” ( marks) (b) Describe using diagrams the operation of the screw compressor. (7 marks) (c) Explain using diagrams the features installed in an air distribution system to remove moisture. (8 marks) (d) Find the pipe size to carry an air flow rate of 10 litres/s at a velocity of 10 m/s. Note: Refer to table 3 (outline of pipe dimensions). (6 marks)

Q3. (a) Explain the term “F.R.L.” and describe the function of each component part. (9 marks) (b) Show using diagrams the operation of a quick exhaust valve. (8 marks) (c) Draw the symbols for four of the following pneumatic components: (i) Double-acting cylinder (ii) 3/2 valve, normally closed position (iii) Push button (iv) Quick exhaust valve (v) Shuttle valve (8 marks)

Q4. (a) Using table 1 and table 2 provided calculate the pressure drop from the compressor to point “A” in the pipeline as shown in figure 1. Pressure at compressor = 6 bar Nominal pipe diameter = 60mm Airflow, converted to free air = 250 litre per second. (12 marks) (b) Describe an industrial application where hydraulic control is used. Give two reasons for the selection of hydraulic actuation in preference to pneumatic actuation for the application selected. (6 marks) (c) Sketch a hydraulic external gear pump and explain how it works. (7 marks)

Q5. (a) A load of 1500kg is to be lifted. Calculate the diameter of: (i) a pneumatic cylinder if air pressure available equals 6 bar (ii) a hydraulic cylinder if hydraulic pressure equals 110 bar. (12 marks) (b) Which cylinder would you choose for the task, state the reasons for your selection. (5 marks) (c) Sketch and label the parts of a gas pressurised hydraulic accumulator. (8 marks)