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Test: Measurement of Temperature & Flow- 2 - GATE MCQ


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25 Questions MCQ Test - Test: Measurement of Temperature & Flow- 2

Test: Measurement of Temperature & Flow- 2 for GATE 2024 is part of GATE preparation. The Test: Measurement of Temperature & Flow- 2 questions and answers have been prepared according to the GATE exam syllabus.The Test: Measurement of Temperature & Flow- 2 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- 2 below.
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Test: Measurement of Temperature & Flow- 2 - Question 1
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What is the most widely used method for a metallurgical temperature measurement?

Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 1
The most widely preferred method of measurement and control of metallurgical temperature is the thermoelectric pyrometer. It can be used up to 3000 F. It consists of a thermocouple, junction block, extension leads, and a recorder.
Test: Measurement of Temperature & Flow- 2 - Question 2
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The total emf of the thermoelectric pyrometer is given as ___________.

Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 2
Generation of an emf due to the contact between two dissimilar metals or wires is called the Peltier effect. The generation of an emf due to a temperature difference due to opposing ends of the same wire is the Thomson effect. The algebraic sum of these four emfs is known as the Seebeck effect.
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Test: Measurement of Temperature & Flow- 2 - Question 3
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The cold junction in a thermoelectric pyrometer is maintained at ________.

Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 3
The Peltier effect of thermoelectric pyrometer involves emf at the hot and cold junctions, whereas the Thomson effect deals with EMFs along each wire. The cold junction must be kept at a constant temperature of 0oC or 32 F.
Test: Measurement of Temperature & Flow- 2 - Question 4
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Chromel-Alumel can be used at a temperature range of __________.
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 4
Thermoelectric pyrometer uses dissimilar materials for the metallic wires to develop an emf. Chromel-Alumel is a commonly used material containing chromel (nickel and chromium) and alumni (nickel, manganese, aluminum, silicon). It is helpful at a temperature range of 1200-2200 F.
Test: Measurement of Temperature & Flow- 2 - Question 5
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Constantan is an alloy containing _________.
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 5
Thermoelectric pyrometer uses dissimilar materials for the metallic wires to develop an emf. One such material is Iron-Constantan. Constantan is an alloy containing 54% copper and 46% nickel. It is helpful at a temperature range of 300-1400 F.
Test: Measurement of Temperature & Flow- 2 - Question 6
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What is the advantage of copper-constantan over iron-constantan?
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 6
Copper-constantan differs from iron-constantan due to the use of copper instead of iron, along with the possible addition of manganese and iron. This is useful for measuring low temperatures up to -420 F and a maximum of 600 F.
Test: Measurement of Temperature & Flow- 2 - Question 7
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Which material is used when radiation pyrometers don’t produce a satisfactory result?
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 7
10% Rhodium-Platinum is a noble-metal thermocouple used for measuring very high temperatures. It can be used in a temperature range of 32-3200 F. These are used when radiation or optical pyrometers do not perform satisfactorily.
Test: Measurement of Temperature & Flow- 2 - Question 8
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__________are used as protecting tubes in thermocouples above 2000 F.
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 8
Thermocouples are often covered using protecting tubes. Wrought iron or cast iron can be used as a protecting tube up to 1300 F. 14% chrome iron is used up to 1500 F, whereas 28% chrome iron or nichrome is used up to 2000 F. Above this temperature, porcelain or silicon carbide tubes are used.
Test: Measurement of Temperature & Flow- 2 - Question 9
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Which type of pyrometer uses an electric circuit?
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 9
A recording pyrometer is used to obtain an entire temperature record. On the addition of an electric circuit, it may control the flow of gas. Such a device is known as a controlling pyrometer.
Test: Measurement of Temperature & Flow- 2 - Question 10
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Thermistor is a contraction _________.
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 10
Thermistor is the short form of a thermal resistor. Resistors that depend on temperature are known as thermal resistors.
Test: Measurement of Temperature & Flow- 2 - Question 11
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Thermistors have ________.
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 11
Thermistor generally has a negative temperature coefficient of resistance. With an increase in temperature, the resistance of a thermistor decreases.
Test: Measurement of Temperature & Flow- 2 - Question 12
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Thermistors ________.
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 12
Thermistors can sense very small temperature changes. The negative temperature coefficient of thermistors can be a few percent/degree Celcius change in temperature.
Test: Measurement of Temperature & Flow- 2 - Question 13
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Thermistor has a resistance of ________.
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 13
Thermistor has a resistance range of 100 ῼ to 100 kῼ. Thermistor consists of a mixture of metallic oxides of manganese, nickel, cobalt, copper, iron, and uranium.
Test: Measurement of Temperature & Flow- 2 - Question 14
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Thermistors are suited for precision temperature measurements.
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 14
Thermistors can be used for precision measurement of temperature, controlling g temperature, and for temperature compensation due to a very large variation in resistance with temperature.
Test: Measurement of Temperature & Flow- 2 - Question 15
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change in resistance is measured using a ________.
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 15
The change in resistance in a thermistor is measured using a Wheatstone bridge. It is used to measure resistance in the range of -100°C to +200°C.
Test: Measurement of Temperature & Flow- 2 - Question 16
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Thermistor material is pressed ________.
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 16
A thermistor material is usually pressed under high pressure to form a flat cylindrical shape. Disks and washers are placed in series or parallel to increase the power dissipation.
Test: Measurement of Temperature & Flow- 2 - Question 17
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Thermistor follows which law for small variations ________.
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 17
For small changes in current, voltage values across a thermistor increases. It attains a peak value. Then the voltage across the thermistor decreases. As a result, Ohm’s law is followed at small current variations.
Test: Measurement of Temperature & Flow- 2 - Question 18
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At small values of voltage, a thermistor ________.
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 18
For minute variations in voltage, the thermistor reaches the peak value of current slowly. As the magnitude of voltage is increased, less time is required to attain peak current.
Test: Measurement of Temperature & Flow- 2 - Question 19
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Thermistor has low resistance.
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 19
Thermistor generally has a very high value of resistance. Cables with shields are required to be used for minimizing interference.
Test: Measurement of Temperature & Flow- 2 - Question 20
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On which factor/s do/does the values of thermal resistance depend?
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 20
The value of thermal resistance usually depends on the size of the transistor, type of heat transfer mechanism, and the type of cooling systems (natural cooling, forced air cooling, etc.). It also depends on the thermal connectivity of the device to a heat sink or metal chassis. The thermal resistance of a power transistor is always less than that of the logic level transistor. The value of thermal resistance should be essentially small to allow the smooth flow of heat from the junction of the power transistor to the surrounding.
Test: Measurement of Temperature & Flow- 2 - Question 21
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Generally, the resistance of the thermistor decreases _______.
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 21
Thermistor is widely applicable for several compensation techniques. It exhibits variation in its resistance concerning temperature change. As the thermistor’s resistance decreases with an increase in temperature, this property of the thermistor is also regarded as the negative temperature coefficient of resistivity.
Test: Measurement of Temperature & Flow- 2 - Question 22
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A Thermistor has low resistance.
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 22
Thermistors generally have an extremely high value of resistance. Cables with a shield are required for usage to minimize interference.
Test: Measurement of Temperature & Flow- 2 - Question 23
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Which of the following has a negative temperature coefficient of resistance?
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 23
The Thermistor decreases exponentially concerning T. The Thermistor RT is used to minimize the increase in collector current. Thus it has a negative temperature coefficient.
Test: Measurement of Temperature & Flow- 2 - Question 24
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Thermistors provide precise temperature measurements.
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 24
Thermistors can be used for precise temperature measurements. It controls the temperature and the compensation due to a large variation in resistance with temperature.
Test: Measurement of Temperature & Flow- 2 - Question 25
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The sensitivity of thermocouple is defined as the time required by thermocouple to reach how much percentage of its steady-state values?
Detailed Solution for Test: Measurement of Temperature & Flow- 2 - Question 25
The time constant of a thermocouple represents the time required to attain a 63.2% value.
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