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GATE Exam  >  GATE Tests  >  Test: Measurement of Non-Electrical Quantities - GATE MCQ

Test: Measurement of Non-Electrical Quantities - GATE MCQ


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20 Questions MCQ Test - Test: Measurement of Non-Electrical Quantities

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Test: Measurement of Non-Electrical Quantities - Question 1
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Working of linear variable differential transducer (LVDT) is based on the principle of variable

Detailed Solution for Test: Measurement of Non-Electrical Quantities - Question 1
The working principle of the linear variable differential transformer or LVDT working theory is mutual induction. The dislocation is nonelectrical energy that is changed into electrical energy.
Test: Measurement of Non-Electrical Quantities - Question 2
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LVDT is an/a ___________ transducer.

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LVDT is an acronym for Linear Variable Differential Transformer. It is a common type of electromechanical transducer that can convert the rectilinear motion of an object to which it is coupled mechanically into a corresponding electrical signal.
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Test: Measurement of Non-Electrical Quantities - Question 3
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Advantage of LVDT

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This is the most widely used inductive transducer for translating linear motion into an electrical signal. As we know that displacement is a vector quantity representing a change in position of a body or a point with respect to a reference. It can be linear or angular (rotational) motion. With the help of the displacement transducer, many other quantities, such as force, stress, pressure, velocity, and acceleration can be found.
Test: Measurement of Non-Electrical Quantities - Question 4
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Radiation pyrometers are used in the temperature range of :
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A radiation pyrometer is a non-contact temperature sensor that infers the temperature of an object by detecting its thermal radiation emitted naturally.
Test: Measurement of Non-Electrical Quantities - Question 5
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If the temperature of a radiating body is 1500°C, the wavelength at which the maximum radiant energy occurs:
Detailed Solution for Test: Measurement of Non-Electrical Quantities - Question 5
The wavelength at which the human body radiates maximum energy is 12 microns. Most of the radiation that the human body emits is in the infrared region. This region has a wavelength that is much more than that of the red visible light and varies between 0.75 to 1,000 microns.
Test: Measurement of Non-Electrical Quantities - Question 6
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A thermocouple:
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A thermocouple is an electrical device consisting of two dissimilar electrical conductors forming an electrical junction. A thermocouple produces a temperature-dependent voltage as a result of the Seebeck effect, and this voltage can be interpreted to measure temperature.
Test: Measurement of Non-Electrical Quantities - Question 7
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Law of intermediate metals in thermocouples allow them to:
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The law of intermediate metals states that a third metal may be inserted into a thermocouple system without affecting the emf generated, if, and only if, the junctions with the third metal are kept at the same temperature.
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Piezoelectric accelerometers meters:
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A piezoelectric accelerometer is an accelerometer that employs the piezoelectric effect of certain materials to measure dynamic changes in mechanical variables (e.g., acceleration, vibration, and mechanical shock).
Test: Measurement of Non-Electrical Quantities - Question 9
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When accelerometers operate in the displacement mode the ratio of forcing frequency to natural frequency should be
Detailed Solution for Test: Measurement of Non-Electrical Quantities - Question 9
In reality, accelerometers have long been used to measure displacement. Eddy current probes are precisely thru-hole mounted into a mechanical casing and measure two very important shaft parameters. First, eddy current probes indicate the location of the shaft relative to the casing.
Test: Measurement of Non-Electrical Quantities - Question 10
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When seismic transducers are used in the acceleration made they should be designed with
Detailed Solution for Test: Measurement of Non-Electrical Quantities - Question 10
The seismic transducer is used for measuring the vibration of the ground. The spring-mass damper element and the displacement transducer are the two main components of the seismic transducer. And the displacement transducer converts the displacement into the electrical quantity.
Test: Measurement of Non-Electrical Quantities - Question 11
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In a drag cup type a.c tachogenerator, the output voltage is:
Detailed Solution for Test: Measurement of Non-Electrical Quantities - Question 11
The drag cup Tachogenerator generates the ripple-free output voltage. The cost of the generator is also very less.
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In D.C technogenerators used for measurement of the speed of a shaft, frequent calibration has to done because
Detailed Solution for Test: Measurement of Non-Electrical Quantities - Question 12
DC Tachogenerators give you accurate DC Voltage output proportional to the speed of its mover. They are widely used in applications for feedback and display purposes.
Test: Measurement of Non-Electrical Quantities - Question 13
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In strain gauge torque transducers, the strain gauges should be mounted at
Detailed Solution for Test: Measurement of Non-Electrical Quantities - Question 13
Generally, four strain gauges are attached to the rotating shaft in the form of a Wheatstone bridge circuit. They are placed precisely at 45 degrees with the shaft axis with gauges 1 and 3 being diametrically opposite, as must gauge 2 and 4.
Test: Measurement of Non-Electrical Quantities - Question 14
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In ionization type of vacuum gauges, the pressure is P is______ Where IG = grid current, IP = plate current and IK = cathode current.
Detailed Solution for Test: Measurement of Non-Electrical Quantities - Question 14
Ionization gauges are the most sensitive gauges for very low pressures (also referred to as hard or high vacuum). They sense pressure indirectly by measuring the electrical ions produced when the gas is bombarded with electrons. Fewer ions will be produced by lower density gases.
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Pirani gauge is useful for measurement of pressure
Detailed Solution for Test: Measurement of Non-Electrical Quantities - Question 15
Pirani gauges are a group of indirect measuring pressure gauges which measure the thermal conductivity of the gas sample. Pirani gauges are typically used in the fine vacuum range (1-1 torr – 10-3 torr), as this is the range where they achieve the best accuracy.
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In a thermocouple pressure gauge, the temperature of heater element is a function of pressure for pressure ranges
Detailed Solution for Test: Measurement of Non-Electrical Quantities - Question 16
Thermocouple gauges are typically used to measure pressures in the range 10−4 mbar up to 1 mbar.
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Strain guage rosettes are used
Detailed Solution for Test: Measurement of Non-Electrical Quantities - Question 17
Biaxial stress is a common occurrence for most structural parts, so strain gauge rosettes are routinely used for experimental stress analysis.
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Hoop stresses act:
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Hoop stress is the stress that occurs along the pipe's circumference when pressure is applied. Hoop stress acts perpendicular to the axial direction.
Test: Measurement of Non-Electrical Quantities - Question 19
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Dummy strain gauges are used for:
Detailed Solution for Test: Measurement of Non-Electrical Quantities - Question 19
A dummy gauge is a strain gauge used in place of a fixed resistor. Temperature compensation is achieved when this dummy gauge is mounted on a piece of material similar to the specimen which undergoes the same temperature changes as does the specimen, but which is not exposed to the same strain.
Test: Measurement of Non-Electrical Quantities - Question 20
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The output of the Geiger Muller tube is in the form of
Detailed Solution for Test: Measurement of Non-Electrical Quantities - Question 20
The Geiger-Müller tube works on the same principle as the spark counter: an ionization between two high voltage electrodes produces a pulse of current (an avalanche of charge) between the electrodes.
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