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M'qqqqfffjfffjKING SAUD UNIVERSITY
COLLEGE OF ENGINEERING
DEPARTMENT OF MECHANICAL ENGINEERING
SUBJECT:-ME302: MECHANICAL MEASUREMENTS
DAY: -SUNDAY TIME: -1300-1600 HOURS DATE: -22-12-1426
QUESTION (1)
(a) Draw a neat sketch of Pitot static probe. Show its connections with manometer and its internal details.
(b)Air at 200C and one bar pressure is flowing through a circular pipe of 100 mm diameter. A Pitot static probe is traversed radially in it and readings are taken at every 10 mm from the centreline of the pipe. The Pitot static probe is connected to a water manometer. The observed dynamic head readings at various radial locations are as tabulated as under. Calculate mass flow rate, average velocity and Reynolds number. The dynamic viscosity of the air is 1.8x10-5Pa-s.
r (mm)01020304050H (mm)75706050400QUESTION (2)
(a) Write down the relation connecting gage factor, gage resistance, strain and resistance change for a strain gage. A resistance type strain gage having a gage factor of 2.00 0.05 and a gage resistance of 121 2 ohms is used in conjunction with a strain indicator having an uncertainty of 2%. What is the uncertainty of output?
(b) A small tank contains 10 liters of water at 200C at atmospheric pressure of 100 kPa. The water is allowed to discharge from an opening in the side of the tank at an initial rate of 6 liters per hour. The discharge rate at any time is directly proportional to the volume remaining in the tank at that time. Calculate the time constant of the system
QUESTION (3)
(a) Determine the rms value of a square wave having amplitude of 12 kN/m2
(b) The resistive element of a force cell forms one of the resistances of four arm Wheatstone bridge. The no load resistance of the resistance element is 500 ohms and its sensitivity is 0.5 ohms per Newton. Initially all the resistances of the bridge are 500 ohms. What will be the bridge out put for an applied load of 1000 Newton, if the bridge excitation voltage is 10 Volts?
QUESTION (4)
(a) Calculate resolution for a 12-bit A/D converter having a range of 5.0 Volts.
(b) Determine the out put voltage from a high pass filter having 330 pF capacitor and 100 kilo-ohm resistance, when an input signal given as under is passed through it.
ViI = {5 sin (2x200t) +2.5 cos (2x1000t) +1.5sin (2x10000t)}
QUESTION (5)
(a) Draw a neat sketch of a total radiation pyrometer. Label its parts. What for is it used?
(b) A water pumping system uses three pumps of capacity 2000 gal/min, 4000 gal/min and 6000 gal/min in a parallel circui+,QRSz{F G
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