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Test: Measurement of Temperature & Flow- 1 - GATE MCQ


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25 Questions MCQ Test - Test: Measurement of Temperature & Flow- 1

Test: Measurement of Temperature & Flow- 1 for GATE 2024 is part of GATE preparation. The Test: Measurement of Temperature & Flow- 1 questions and answers have been prepared according to the GATE exam syllabus.The Test: Measurement of Temperature & Flow- 1 MCQs are made for GATE 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Measurement of Temperature & Flow- 1 below.
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Test: Measurement of Temperature & Flow- 1 - Question 1
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Resistance temperature detector is ___________.

Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 1
The resistance temperature detector is an electrical transducer. It is used for measuring temperature variation. It is also known as a resistance thermometer.
Test: Measurement of Temperature & Flow- 1 - Question 2
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What can be done to make the color comparison better for an optical pyrometer?

Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 2
An optical pyrometer measures temperature by comparing the brightness of the emitted light. To make this comparison easy, a red filter is used. This red filter limits the visible radiation only to the wavelength of red radiation.
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Test: Measurement of Temperature & Flow- 1 - Question 3
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Liquid expansion thermometers are filled with ________.

Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 3
The liquid-expansion thermometer has the entire system filled with an organic liquid or mercury. Mercury is used at a temperature range of -35 to 950 F. Alcohol and creosote are used at -110 to 160 F and 20 to 400 F, respectively.
Test: Measurement of Temperature & Flow- 1 - Question 4
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Which of these materials is not used for resistance coils?
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 4
Resistance coils are generally made of nickel, copper, or platinum. Nickel and copper can be used in the 150-500 F temperature range, whereas platinum can be used between -350 to 1100 F.
Test: Measurement of Temperature & Flow- 1 - Question 5
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Resistance thermometer generally makes use of ________ for the measurement of resistance.
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 5
Resistance thermometers are based on the principle of an increase in electrical resistance with increasing temperature. It consists of a resistance coil mounted in a protecting tube connected to a resistance measuring instrument. Generally, the Wheatstone bridge is used in this process.
Test: Measurement of Temperature & Flow- 1 - Question 6
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Bimetallic strips are employed in ________ thermometers.
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 6
Bimetallic strips made by bonding high-expansion and low-expansion metals are used in the standard thermostat. When used as an industrial temperature indicator, these can be bent into a coil.
Test: Measurement of Temperature & Flow- 1 - Question 7
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What can be done to increase the temperature range of optical pyrometers?
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 7
Optical pyrometers have a temperature range of 1400-2400 F. This range can be improved by using an absorbing screen between the lens and the filament. Therefore, by using various absorbing screens, the content can be over 10000 F.
Test: Measurement of Temperature & Flow- 1 - Question 8
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What is the maximum usable temperature of radiation pyrometers?
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 8
The radiation pyrometer does not require direct contact with the hot body. Therefore, the upper limit for temperature is not limited by withstanding high temperatures. The lower limit is 1000 F, whereas there is no upper limit temperature by using proper stops.
Test: Measurement of Temperature & Flow- 1 - Question 9
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What temperature is the dark orange color associated with?
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 9
The temperature of metals can be estimated by simply looking at the color of the hot body. Dark orange is associated with a temperature of about 1150 F, while for bright cherry, orange, and yellow, it is 1475 F, 1750 F, and 1800 F correspondingly.
Test: Measurement of Temperature & Flow- 1 - Question 10
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Sensing element in the thermometer must provide ________.
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 10
The sensing element in a thermometer must give a large change in the resistance for a given change in the temperature.
Test: Measurement of Temperature & Flow- 1 - Question 11
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Platinum is used for industrial applications because ________.
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 11
In industrial applications, platinum is used due to its accuracy in providing measurements. It is also reproducible. The platinum element can be used to measure temperatures of about 1000 K.
Test: Measurement of Temperature & Flow- 1 - Question 12
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Measurement of elevated temperatures is defined as ___________.
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 12
Pyrometry deals with elevated temperatures, generally around 950 F. The apparatus that is used in this process is known as a pyrometer. Thermometry generally deals with the measurement of temperatures below 950 F.
Test: Measurement of Temperature & Flow- 1 - Question 13
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How can corrosion be prevented in a resistance thermometer?
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 13
Corrosion can be eliminated in a resistance thermometer by enclosing the elements in a protective tubular glass made of pyrex, quartz, or crystal, depending upon the temperature range.
Test: Measurement of Temperature & Flow- 1 - Question 14
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Nickel and its alloys can be used over a temperature range of ________.
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 14
Temperature sensors constructed using nickel and its alloys can be used in the temperature range of 100 to 450 K. Compared to platinum, they are less expensive. They have a comparatively higher temperature coefficient that increases with temperature.
Test: Measurement of Temperature & Flow- 1 - Question 15
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In a temperature sensing element ________.
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 15
To achieve a significant change in the value of resistance for a slight change in the value of temperature, a high value of α is required. Change in resistance is measured through a Wheatstone’s bridge.
Test: Measurement of Temperature & Flow- 1 - Question 16
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Most metallic conductors have a ________.
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 16
In general metallic conductors have a positive temperature coefficient of resistance. The resistance increases with an increase in temperature.
Test: Measurement of Temperature & Flow- 1 - Question 17
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If the sensing element is large, less heat is required.
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 17
When the sensing element in a resistance thermometer is small in size, less heat is required to raise the temperature. Platinum, nickel, and copper are the commonly used metals for measuring temperature.
Test: Measurement of Temperature & Flow- 1 - Question 18
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Relation between temperature and resistance of a conductor is ________.
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 18
The relationship between temperature and resistance of a conductor is given by

Rt = Rref [1 + α∆t]

where Rt is the resistance of the conductor at t°C.

Rref is the resistance of the conductor at the reference temperature

α is the temperature coefficient of resistance

∆t is the difference between the temperature being measured and the reference temperature.

Test: Measurement of Temperature & Flow- 1 - Question 19
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Resistance thermometer provides the change in electrical resistance.
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 19
A resistance thermometer provides a change in the electrical resistance concerning a variation in the temperature. Resistance thermometers work on the principle of change in the electrical resistance with variation in the temperature.
Test: Measurement of Temperature & Flow- 1 - Question 20
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What temperature does the dark red color generally deal with?
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 20
The temperature of metals can be estimated by simply looking at the color of the hot body. Dark red is assigned a temperature of 1150 F, whereas, for faint red, dark cherry, and cherry red, it is 950 F, 1175 F, and 1300 F in that order.
Test: Measurement of Temperature & Flow- 1 - Question 21
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Bimetallic strips contain _______ as a metal.
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 21
Bimetallic strips include invar as one metal and yellow brass as another. For higher temperatures, nickel alloy can be used. These can be used in temperatures ranging from -100 F to 1000 F.
Test: Measurement of Temperature & Flow- 1 - Question 22
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_______ is commonly used in liquid-expansion thermometers.
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 22
Liquid-expansion thermometers consist of a bulb and an expansible device. The bulb is exposed to the temperature that needs to be measured, and usually, a Bourdon tube is used as an expansion device. These are connected by capillary tubing and are filled with a medium.
Test: Measurement of Temperature & Flow- 1 - Question 23
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Why is invar used in bimetallic strips?
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 23
Most bimetallic strips are composed of invar and yellow brass as metal. Invar has the advantage of a low coefficient of expansion, whereas yellow brass can be used at low temperatures.
Test: Measurement of Temperature & Flow- 1 - Question 24
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What does Stefan-Boltzmann law for radiation pyrometers denote?
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 24
The principle of a radiation pyrometer is based on a standard radiation body known as a blackbody. By Stefan-Boltzmann’s law, W = KT4 expresses that radiation energy is proportional to the fourth power of absolute temperature. Here W is the energy emitted, and K is a constant proportionality.
Test: Measurement of Temperature & Flow- 1 - Question 25
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A radiation pyrometer is based on ___________.
Detailed Solution for Test: Measurement of Temperature & Flow- 1 - Question 25
The principle of a radiation pyrometer is based on a standard radiation body known as a blackbody. These pyrometers are calibrated to indicate blackbody or true temperature. The Stefan-Boltzmann law expresses the rate of radiation energy.
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