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Icen 415:Specialised Measurement Systems I Question Paper

Icen 415:Specialised Measurement Systems I

Course:Specialised Measurement

Institution: Egerton University question papers

Exam Year:2011

1.)Use construction diagrams to describe the construction and application differences of 3 main types of optical fibres
2.)Use a suitable diagram to explain what is meant by maximum angle of acceptance in respect to optical fibres.Show how this angle can be determined for a specific fibre cable
3.)Given that the transmission factor of a 2km fibre cable is 0.8 calculate its overall attenuation loss in dB per km
4.)State why the time constant of a given temperature sensor will depend critically on the nature and velocity of the fluid surrounding the sensor
5.)Draw a block diagram of thermal velocity sensor
6.)Explain the practical significance of measuring velocity at a point in a fluid or air flowing in a pipe
7.)A pitot tube is used to measure mean velocity of a high pressure gas in a 0.15m diameter pipe.At maximum flow rate,the mean pitot differential pressure is 250 Pa.Given that the density and viscosity of the gas are 5kgm^-3 and 5×10^-5 Pas
i) Calculate the mean velocity of the gas at maximum flow rate
ii)Estimate the maximum mass flowrate
8.)Use a suitable diagram to explain the principles of operation of a pitostatic tube.Assume incompressible flow
9.)Use a suitable schematic diagram to explain the operation of a constant temperature anemometer system for fluid velocity measurements.Explain why the system is only suitable for measuring low fluid velocities
10.)Use a suitable diagram to explain the basic principle of operation of a vortex flowmeter.State 3 methods used in vortex detection
11.)State why a pneumatic measurement system is termed as an "intrinsically safe system"

Icen 415:Specialised Measurement Systems I Question Paper

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