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Set 435: Fluid Poweer Systems Question Paper

Set 435: Fluid Poweer Systems

Course:Bachelor Of Engineering In Mechanical Engineering

Institution: Kenyatta University question papers

Exam Year:2008

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2008/2009
FIRST SEMESTER EXAMINATION FOR THE DEGREE OF BACHELOR OF
SCIENCE (ENERGY ENGINEERING)
SET 435: FLUID POWER SYTEMS

DATE: Tuesday 25th November, 2008

TIME: 11.00 a.m. – 1.00 p.m.

INSTRUCTIONS
This paper consists of FIVE questions.
Answer question ONE and any other TWO.

1.
(a)
What are the basic principles of hydraulics?

[4 marks]
(b)
With the aid of a diagram, describe the operation of a closed center
hydraulic system raising a load.

[13 marks]
(c)
What are the advantages and disadvantages of hydraulic systems
compared to other common methods of transferring power?

[8 marks]
(d)
With the aid of a diagram explain the operation of an in-line axial piston
pump.

[15 marks]
2.
(a)
What are the purposes for which pressure control valves are used?

[4 marks]

(b)
What precautions should be taken before servicing valves? [5 marks]

(c)
What factors does a designer of a hydraulic system consider when
choosing a seal?

[6 marks]
3.
(a)
With the aid of diagrams show an open loop control system used to
control the water level in a tank and show its block diagram.

[10 marks]
(b)
Discuss the purpose of electrohydraulic servovalves in hydraulic systems.
[5 marks]

2

4.
(a)
Define the three ratings used to judge pump quality.
[6 marks]
(b)
A pump operating at a pressure of 100kg/cm2 has a bearing life of
4800 hrs. If the operating pressure is raised to 200 kg/cm2, how long
could the bearings be expected to last?

[4 marks]
(c)
What are the possible causes of excessive wear in a hydraulic pump?
[5 marks]
5.
(a)
Sketch a typical single-acting cylinder used in a hydraulic system.

[5 marks]
(b)
Explain the features that a hydraulic reservoir must have in order to serve
its purpose.

[6 marks]
(c)
Explain four ways in which contamination gets into a hydraulic system.

[4 marks]

………………

Set 435: Fluid Poweer Systems Question Paper

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