Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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Transcribed Image Text:%VY l. lin. 3. N
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Sheet 1
Page 1 of 2
Q1/
An orifice meter is to be calibrated for the measurement of the flow rate of a stream of
liquid acetone. The differential manometer fluid has a specific gravity of 1.10. The calibration
is accomplished by connecting the orifice meter in series with a rotameter that has
previously been calibrated for acetone, adjusting a valve to set the flow rate, and recording
the flow rate (determined from the rotameter reading and the rotameter calibration curve)
and the differential manometer reading, h. The procedure is repeated for several valve
settings to generate an orifice meter calibration curve of flow rate versus h. The following
data are taken.
VALVEX
Flow Rate D (ml/s)
Manometer Reading
h(mm)
62
10
15
87
107
20
123
25
30
138
151
1- For each of the given readings, calculate the pressure drop across the orifice, AP (mm
Hg).
2- The flowrate through an orifice should be related to the pressure drop across the
orifice by the formula.
V = KP"
Verify graphically that the given orifice calibration data are correlated by this
relationship, and determine the values of K and n that best fit the data.
3- Suppose the orifice meter is mounted in a process line containing acetone and a
reading h = 23 mm is obtained. Determine the volumetric, mass, and molar flow rates
of acetone in the line.
Q2/
A thermostat control with dial markings from 0 to 100 is used to regulate the
temperature of an oil bath. A calibration plot on logarithmic coordinates of the temperature,
T('F), versus the dial setting, R, is a straight line that passes through the points (R1 = 20.0,
Ti =110.0 °F) and (R2 = 40.0, T2 = 250.0 °F).
(a) Derive an equation for T(°F) in terms of R.
(b) Estimate the thermostat setting needed to obtain a temperature of 320°F.
Sheet 1
Page 2 of 2
Q3/
Convert the temperatures in Parts (a) and (b) and temperature intervals in Parts (c) and
(d):
a) T= 85 °F to °R, °C, K
b) T=- 10°C to K, °F, °R
c) AT = 85 °C to K, °F, °R
II
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- Sheet 1 Page 1 of 2 Q1/ An orifice meter is to be calibrated for the measurement of the flow rate of a stream of liquid acetone. The differential manometer fluid has a specific gravity of 1.10. The calibration is accomplished by connecting the orifice meter in series with a rotameter that has previously been calibrated for acetone, adjusting a valve to set the flow rate, and recording the flow rate (determined from the rotameter reading and the rotameter calibration curve) and the differential manometer reading, h. The procedure is repeated for several valve settings to generate an orifice meter calibration curve of flow rate versus h. The following data are taken. VALVEX Flow Rate V (mL/s) Manometer Reading h(mm) 62 10 87 15 107 20 123 138 25 30 151 1- For each of the given readings, calculate the pressure drop across the orifice, AP (mm Hg). 2- The flowrate through an orifice should be related to the pressure drop across the orifice by the formula. D = KPn Verify graphically that the…arrow_forwardNonearrow_forwardA fan is used to blow air (density=1.15 kg/m3) in a duct. A pitot tube is placed in the duct as shown. The static pressure in the duct is measured with a wall tap and pressure gage. Use the gage readings to determine the velocity of the air. note: Pitot tube is used to measure the air total pressure. Mind on the head to be calculated if it is already in air. x 103 Pa Ptot tabe 12 x 103 Paarrow_forward
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