Theory and Design for Mechanical Measurements
6th Edition
ISBN: 9781118881279
Author: Richard S. Figliola, Donald E. Beasley
Publisher: WILEY
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Textbook Question
Chapter 8, Problem 8.23P
Complete the following table for a T-type thermocouple using appropriate computer software or programmable calculator:
Temperature (°C)
| Measured | Reference | emf (mV) |
| 100 | 0 | |
| 0 | 0.6 | |
| 100 | 50 | |
| 50 | 3 |
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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.
A thermocouple is used to
measure the temperature T1. The
thermocouple reference junction
labeled 2 is at a temperature of
20°C. The voltage output is
measured using a potentiometer
and found to be 4.686 mV. What
is T1 in degrees
RK: if the temperature values are
not in the table, you have to use
interpolation.
Select one:
O a. 98
O b. 118
O c. 105
O d. 108
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The left side of this equation tells how much energy Q the cylinder gives to the water while it cools. The right
side of this equation tells how much energy Q the water and aluminum cup absorb from the cylinder to warm
up. Because it is the same energy, they are equal.
What is known in this equation?
Mcyl
411.7 g, malum
46.5 g, malum+water
= 175 g
Can you find: mwater =? g
Twater = Talum = 20°C (water and cup of room temperature)
90°C, T; = 35°C (hot cylinder and cool "cylinder+cup+water" temperatures)
Tcyl
kCal
Calum = 0.22, Cwater
1 (specific heat of water and aluminum, measured in units
kg-°C
What are we looking for is Ccul - How we find it? Plug all the numbers into the equation (1), Ccul will be one
unknown which you can calculate from the equation. Important, convert all the masses from grams to kilograms!
After
you find Ccyl, compare it to known value for the copper 0.093(our cylinder is made out of copper).
|Ceyl -0.093|
% :
· 100%
0.093
Chapter 8 Solutions
Theory and Design for Mechanical Measurements
Ch. 8 - Prob. 8.1PCh. 8 - Fixed temperature points in the International...Ch. 8 - Answers to the following questions may be found in...Ch. 8 - Calculate the resistance of a platinum wire that...Ch. 8 - Plot the resistance of a platinum wire that is 5 m...Ch. 8 - An RTD forms one arm of a Wheatstone bridge, as...Ch. 8 - An RTD forms one arm (/?4) of a Wheatstone bridge,...Ch. 8 - Research and describe current state-of-the-art...Ch. 8 - Prob. 8.9PCh. 8 - 8.10 Estimate the required level of uncertainty in...
Ch. 8 - 8.11 A thermistor is placed in a 100 °C...Ch. 8 - Prob. 8.12PCh. 8 - Prob. 8.13PCh. 8 - The thermocouple circuit in Figure 8.45 represents...Ch. 8 - The thermocouple circuit in Figure 8.45 represents...Ch. 8 - The thermocouple circuit in Figure 8.45 is...Ch. 8 - 8.17 a. The thermocouple shown in Figure 8.46a...Ch. 8 - Prob. 8.18PCh. 8 - Prob. 8.19PCh. 8 - A temperature measurement requires an uncertainty...Ch. 8 - A temperature difference of 3.0 °C is measured...Ch. 8 - Complete the following table for a J-type...Ch. 8 - Complete the following table for a T-type...Ch. 8 - Prob. 8.24PCh. 8 - 8.25 You are employed as a heating, ventilating,...Ch. 8 - A J-type thermocouple for use at temperatures...Ch. 8 - A J-type thermocouple is calibrated against an RTD...Ch. 8 - A beaded thermocouple is placed in a duct in a...Ch. 8 - Consider a welded thermocouple bead that...Ch. 8 - Prob. 8.30PCh. 8 - Prob. 8.31PCh. 8 - Consider the typical construction of a sheathed...Ch. 8 - An iron-constantan thermocouple is placed in a...Ch. 8 - Figure 8.48 Schematic diagram for Problems 8.33,...Ch. 8 - Figure 8.48 Schematic diagram for Problems 8.33,...Ch. 8 - 8.36 In Example 8.5, an uncertainty value for Rf...Ch. 8 - The thermocouple circuit shown in Figure 8.49...Ch. 8 - Prob. 8.38PCh. 8 - 8.39 A thin-film heat flux sensor employs a K-type...Ch. 8 - A thin-film heat flux sensor has a sensitivity uV...Ch. 8 - 8.41 A T-type thermopile is used to measure...Ch. 8 - 8.42 A T-type thermocouple referenced to 0 °C is...Ch. 8 - A T-type thermocouple referenced to 0 °C develops...Ch. 8 - 8.44 A temperature measurement system consists of...
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