Instrumentation Engineering
GATE IN topic:sensors-industrial-instrumentation PYQs
Build your understanding with focused practice from past exam papers.
Questions 21–30 of 53. Imported answers require independent review unless marked reviewed.
Question 17
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A Hall sensor is based on the principle of ______
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The figure shows a Chromel-Alumel thermocouple, where the junction A is held at temperature
, and a thermal emf
is measured using an ideal voltmeter between the open ends B1 and B2, both held at temperature
. Two identical copper wires are introduced between B1-C1 and B2-C2 as shown in the figure. When C1 and C2 are held at temperature
, the voltmeter reads a thermal emf
. Then, ______
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 39
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A car is moving collinearly with a laser beam emitted by a transceiver. A laser pulse emitted at
s is received back by the transceiver 100 ns (nanoseconds) later after reflection from the car. A second pulse emitted at
s is received back 90 ns later. Given the speed of light is
m/s, the average speed of the car in this interval is ________Your answerChoose one option.
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Monochromatic light of wavelength 532 nm is used to measure the absorption coefficient of a material in a UV-Visible Spectrophotometer. The measured light intensity after transmission through a 1 cm thick sample of the material is 0.414 mW/cm
. For a sample of thickness 2 cm, the measured light intensity is 0.186 mW/cm
. The absorption coefficient (in cm
) of the material is ______ (round off to two decimal places)Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 7
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Input-output characteristic of a temperature sensor is exponential for a
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A strain gage having nominal resistance of 100
has a gage factor of 2.5. If the strain applied to the gage is 100
m/m, its resistance in ohm will change to __________ (rounded off to two decimal places).Log in to check the answer
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Given: Density of mercury is 13,600 kg/m³ and acceleration due to gravity is 9.81 m/s². Atmospheric pressure is 101 kPa. In a mercury U-tube manometer, the difference between the heights of the liquid in the U tube is 1 cm. The differential pressure being measured in pascal is ______ (rounded off to the nearest integer).
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A piezoresistive pressure sensor has a sensitivity of 1 (mV/V)/kPa. The sensor is excited with a dc supply of 10 V and the output is read using a 3 ½ digit 200 mV full-scale digital multimeter. The resolution of the measurement set-up, in pascal is ___.
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A J-type thermocouple has an output voltage
V, where
is the junction temperature in Celsius (°C). The thermocouple is used with reference junction compensation, as shown in the figure. The Instrumentation amplifier used has a gain G = 20. If
is 1 °C, for an input
of 100 °C, the output
of the instrumentation amplifier in millivolt is
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 34
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A laser pulse is sent from ground level to the bottom of a concrete water tank at normal incidence. The tank is filled with water up to 2 m below the ground level. The reflected pulse from the bottom of the tank travels back and hits the detector. The round-trip time elapsed between sending the laser pulse, the pulse hitting the bottom of the tank, reflecting back and sensed by the detector is 100 ns. The depth of the tank from ground level marked as x in metre is _____.
(Refractive index of water
and velocity of light in air
m/s)
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