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MEEN 464 LABS 1 - 10 Questions and
Correct Answers/ Latest Update / Already
Graded
T-type thermocouples consist of
Ans: Copper / Constantan
Which thermocouple will have the shortest time constant?
Ans: 30-gage T-type thermocouple with an exposed junction
Overall uncertainty is defined as
Ans: ((bias limit)2+(precision limit)2)0.5
Resistance Temperature Detectors (RTD) measure the temperature by
Ans: The change in electrical resistance in pure metals as a
function of temperature
You will determine the time constant of a bi-metallic dial
thermometer. The temperature of the room and the coolant in the
constant temperature bath to be 25 and 100 ˚C. What is the
temperature of the bi-metallic dial thermometer at one time constant?
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Ans: (0.632)*(100-25)+25 = 72.4
The following figure shows the transient temperature response of a
temperature measuring device. What is the time constant of the device
in seconds?
Ans: (0.632)*(90-10)+10 = 60.56
Then check time it takes to get from 10 to 60.5, it should be
about: 1.5 sec
Use the given steady state temperature measurements to calculate the
precision limit of the device. Use 95% confidence level.
Ans: On calc: click stat, then 1 to edit the list. Exit and then
click2nd + list and find the stdev. multiply it by given table.
Answer: 0.8568 ˚C
stdev = sqrt( sum[(x - mean)^2]/ (n - 1))
Consider three thermocouples initially at temperature Ti are placed
into a bath at temperature . The three thermocouples include a
sheathed 0.1 inch-diameter T-type thermocouple, sheathed 0.2 inch-
diameter T-type thermocouple and 30-gage T-type thermocouple with
an exposed junction. Match each probe with the curve (A, B, or C) that
best represents the transient response of temperature.
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Ans: 30-gauge T-type thermocouple with an exposed junction:
fastest to reach steady state
sheathed 0.1 inch-diameter T-type thermocouple: second
fastest to reach steady state
sheathed 0.2 inch-diameter T-type thermocouple: Slowest to
reach steady state
A NIST calibrated thermometer shows an air temperature of 24.3˚C. A
student also measured the air temperature by means of an alcohol
thermometer as depicted below. What is the bias error of this
measurement with the alcohol thermometer?
Ans: B = abs(X_mean - X_calibrated) + 0.5*resolution
0.8
Sample exam:
RTD (resistance temperature detector) is a temperature sensor that
contains ceramic or polymer that changes its electrical resistance when
the temperature changes
Ans: False
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(Pure metal, not polymer)
Sample exam:
A Bi-metallic Dial Thermometer is a temperature sensor that contains
metal strips that change its length when the temperature changes
Ans: True
Sample exam:
A mercury in glass thermometer measures the temperature by the
change in liquid volume as a function of temperature.
Ans: True
Sample exam:
Due to harsh conditions, a sheath may be used to protect a
thermocouple. The time constant of the thermocouple will be smaller
due to the sheath.
Ans: False
All rights reserved © 2025/ 2026 |
MEEN 464 LABS 1 - 10 Questions and
Correct Answers/ Latest Update / Already
Graded
T-type thermocouples consist of
Ans: Copper / Constantan
Which thermocouple will have the shortest time constant?
Ans: 30-gage T-type thermocouple with an exposed junction
Overall uncertainty is defined as
Ans: ((bias limit)2+(precision limit)2)0.5
Resistance Temperature Detectors (RTD) measure the temperature by
Ans: The change in electrical resistance in pure metals as a
function of temperature
You will determine the time constant of a bi-metallic dial
thermometer. The temperature of the room and the coolant in the
constant temperature bath to be 25 and 100 ˚C. What is the
temperature of the bi-metallic dial thermometer at one time constant?
All rights reserved © 2025/ 2026 |
, Page |2
Ans: (0.632)*(100-25)+25 = 72.4
The following figure shows the transient temperature response of a
temperature measuring device. What is the time constant of the device
in seconds?
Ans: (0.632)*(90-10)+10 = 60.56
Then check time it takes to get from 10 to 60.5, it should be
about: 1.5 sec
Use the given steady state temperature measurements to calculate the
precision limit of the device. Use 95% confidence level.
Ans: On calc: click stat, then 1 to edit the list. Exit and then
click2nd + list and find the stdev. multiply it by given table.
Answer: 0.8568 ˚C
stdev = sqrt( sum[(x - mean)^2]/ (n - 1))
Consider three thermocouples initially at temperature Ti are placed
into a bath at temperature . The three thermocouples include a
sheathed 0.1 inch-diameter T-type thermocouple, sheathed 0.2 inch-
diameter T-type thermocouple and 30-gage T-type thermocouple with
an exposed junction. Match each probe with the curve (A, B, or C) that
best represents the transient response of temperature.
All rights reserved © 2025/ 2026 |
, Page |3
Ans: 30-gauge T-type thermocouple with an exposed junction:
fastest to reach steady state
sheathed 0.1 inch-diameter T-type thermocouple: second
fastest to reach steady state
sheathed 0.2 inch-diameter T-type thermocouple: Slowest to
reach steady state
A NIST calibrated thermometer shows an air temperature of 24.3˚C. A
student also measured the air temperature by means of an alcohol
thermometer as depicted below. What is the bias error of this
measurement with the alcohol thermometer?
Ans: B = abs(X_mean - X_calibrated) + 0.5*resolution
0.8
Sample exam:
RTD (resistance temperature detector) is a temperature sensor that
contains ceramic or polymer that changes its electrical resistance when
the temperature changes
Ans: False
All rights reserved © 2025/ 2026 |
, Page |4
(Pure metal, not polymer)
Sample exam:
A Bi-metallic Dial Thermometer is a temperature sensor that contains
metal strips that change its length when the temperature changes
Ans: True
Sample exam:
A mercury in glass thermometer measures the temperature by the
change in liquid volume as a function of temperature.
Ans: True
Sample exam:
Due to harsh conditions, a sheath may be used to protect a
thermocouple. The time constant of the thermocouple will be smaller
due to the sheath.
Ans: False
All rights reserved © 2025/ 2026 |
