GATE IN topic:sensors-industrial-instrumentation PYQs & Answers — Page 2

Questions 11–20 of 53. Imported answers require independent review unless marked reviewed.

A linear potentiometer (0 − 10 kΩ) is used to measure the water level as shown in the figure. The resistance between A and C varies linearly from 0 to 10 kΩ for a change in water level from 0 to 20 cm. The sensor is excited using a DC voltage source,

V with an internal resistance,

. If

V, the water level is _____ cm (rounded off to one decimal place).

Diagram for Instrumentation Engineering question 32

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Consider an ultrasonic measurement system shown in the figure. The ultrasonic transmitter (T) sends a continuous wave signal

volts towards an object whose vibration is modeled as

volts. Neglecting the phase shift due to any other effect, the received signal at the receiver (R) is

volts.

Assuming the frequency sensitivity factor as 500 Hz/volt,

kHz,

kHz, the modulation index (

) and the frequency deviation in

, respectively, are

Diagram for Instrumentation Engineering question 48

Your answerChoose one option.

0.25 and

250 Hz

0.5 and

500 Hz

1 and

1000 Hz

0.75 and

1000 Hz

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Consider the capacitive sensor circuit and its output voltage shown in the figure. The circuit is switched ON at

. Assuming the opamp to be ideal, the frequency of the output voltage

is __________ kHz (rounded off to two decimal places).

Diagram for Instrumentation Engineering question 52

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A shielded cable with C_stray = 20 pF and R_wire = 10 Ω is used to connect the inductive sensors as shown in the figure. The RMS value of V_out is ____ V (rounded off to two decimal places).

Note: Assume all components are ideal, and sensors are not magnetically coupled.

Diagram for Instrumentation Engineering question 56

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Inductance of a coil is measured as 10 mH, using an LCR meter, when no other objects are present near the coil. The LCR meter uses a sinusoidal excitation at 10 kHz. If a pure copper sheet is brought near the coil, the same LCR meter will read__________.

Your answerChoose one option.

less than 10 mH

10 mH

more than 10 mH

less than 10 mH initially and then stabilizes to more than 10 mH

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Which of the following flow meters offers the lowest resistance to the flow?

Your answerChoose one option.

Turbine flow meter

Orifice flow meter*

Venturi meter

Electromagnetic flow meter

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Pair the quantities (p) to (s) with the measuring devices (i) to (iv).

(i) Linear Variable Differential Transformer (LVDT) (ii) Thermistor (iii) Strain gauge (iv) Diaphragm

(p) Torque (q) Pressure (r) Linear position (s) Temperature

Your answerChoose one option.

(i) - (r), (ii) - (s), (iii) - (q), (iv) - (p)

(i) - (p), (ii) - (s), (iii) - (r), (iv) - (q)

(i) - (r), (ii) - (s), (iii) - (p), (iv) - (q)

(i) - (q), (ii) - (s), (iii) - (p), (iv) - (r)

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A wire-wound ‘resistive potentiometer type’ angle sensor with 72 turns is used in an application. The first turn of the potentiometer is connected to ground while its last turn is connected to 3.6 V. The width of the wiper covers two turns ensuring make-before-break. The output (wiper) voltage when the wiper is on top of both the turns 35 and 36 is ______ V (rounded off to two decimal places).

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The two secondaries of a linear variable differential transformer (LVDT) showed a magnitude of 2 V (RMS) for zero displacement position of the core. It is noted that the phase of one of the secondaries has a deviation of one degree from the expected phase. Other than this deviation, the LVDT is ideal.

If the differential output sensitivity of the LVDT is 1 mV (RMS)/1

m, the output for zero displacement is __________

m (rounded off to one decimal place).

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A pneumatic nozzle-flapper system is conventionally used to convert ______

Your answerChoose one option.

Small changes in flapper’s velocity to large changes in output temperature

Small changes in flapper’s displacement to large changes in output temperature

Small changes in flapper’s velocity to large changes in output pressure

Small changes in flapper’s displacement to large changes in output pressure

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GATE IN topic:sensors-industrial-instrumentation PYQs

Question 32

Question 48

Question 52

Question 56

Question 12

Question 13

Question 14

Question 51

Question 52

Question 12