Mechanical Quantity Measurement - Sensors and Industrial Instrumentation - Instrumentation Engineering Previous Year Questions

1

2009 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Mechanical Quantity Measurement

Instrumentation Engineering (IN) 2009

The range of angular displacement (in radians) this system can measure is

A

\(-\frac{l}{8R}\) to \(+\frac{l}{8R}\)

B

\(-\frac{l}{4R}\) to \(+\frac{l}{4R}\)

C

\(-\frac{3l}{4R}\) to \(+\frac{l}{4R}\)

D

\(-\frac{l}{R}\) to \(+\frac{l}{R}\)

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2

2010 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Mechanical Quantity Measurement

Instrumentation Engineering (IN) 2010

Poisson’s ratio for a metal is 0.35. Neglecting piezo-resistance effect, the gage factor of a strain gage made of this metal is

A

0.65

B

1

C

1.35

D

1.70

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3

2010 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Mechanical Quantity Measurement

Instrumentation Engineering (IN) 2010

The seismic mass of an accelerometer oscillates sinusoidally at 100 Hz with a maximum displacement of 10 mm from its mean position. The peak acceleration of the seismic mass is

A

3947.84 m/s²

B

3141.50 m/s²

C

314.15 m/s²

D

100.00 m/s²

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4

2011 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Mechanical Quantity Measurement

Instrumentation Engineering (IN) 2011

The Treadmill Test is used to diagnose

A

the balancing style during walk of the patient

B

the auditory activity of the patient

C

the visual activity of the patient

D

the cardiac activity of the patient

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5

2011 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Mechanical Quantity Measurement

Instrumentation Engineering (IN) 2011

The conventional way of expressing vibration is in terms of

A

Richter scale

B

Acceleration due to gravity

C

Speed of sound

D

Atmospheric pressure

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6

2011 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Mechanical Quantity Measurement

Instrumentation Engineering (IN) 2011

In a flapper-nozzle displacement transducer, the values of the following parameters are given: Diameter of the orifice = 0.2 mm, Diameter of the nozzle = 0.8 mm, Supply pressure = \(1.4 × 10^5\) kPa (gauge), Ambient pressure = 0 (gauge). The maximum value of the sensitivity is

A

4.0 MPa/mm

B

5.6 MPa/mm

C

6.4 MPa/mm

D

7.3 MPa/mm

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7

2013 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Mechanical Quantity Measurement

Instrumentation Engineering (IN) 2013 [Session 1]

An accelerometer has input range of 0 to 10g, natural frequency 30 Hz and mass 0.001 kg. The range of the secondary displacement transducer in mm required to cover the input range is

A

0 to 2.76

B

0 to 9.81

C

0 to 11.20

D

0 to 52.10

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8

2013 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Mechanical Quantity Measurement

Instrumentation Engineering (IN) 2013 [Session 1]

The maximum frequency of a force signal in Hz below the natural frequency within its useful mid-band range of measurement, for which the gain amplitude is less than 1.05, approximately is,

A

35

B

350

C

3500

D

16 × 10³

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9

2007 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Mechanical Quantity Measurement

Instrumentation Engineering (IN) 2007

The figure below shows various configurations of bonding a strain gauge to a cantilever subjected to a bending force F. Which configuration gives the maximum change in resistance for this force?

A

P

B

Q

C

R

D

All have equal change in resistance

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10

2007 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Mechanical Quantity Measurement

Instrumentation Engineering (IN) 2007

During intravascular measurement of arterial blood pressure, catheters may be introduced in different configurations, as shown in the figures below:

The static pressure will be measured correctly in the configuration(s)

A

P and Q but not in R

B

R only

C

Q only

D

P and R but not in Q

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11

2008 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Mechanical Quantity Measurement

Instrumentation Engineering (IN) 2008

A linear variable differential transformer (LVDT) is

A

a displacement transducer

B

an impedance matching transformer

C

a differential temperature sensor

D

an auto transformer

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12

2008 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Mechanical Quantity Measurement

Instrumentation Engineering (IN) 2008

The speed of a gear having 60 teeth is measured using a proximity sensor. The output of the proximity sensor is fed to a counter with a gating time of 1 s. The counter indicates a value of 120. The speed at which the gear is rotating is

A

60 rpm

B

120 rpm

C

600 rpm

D

1200 rpm

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13

2008 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Mechanical Quantity Measurement

Instrumentation Engineering (IN) 2008

The torque in a rotating shaft is measured using strain gauges. The strain gauges must be positioned on the shaft such that the axes of the strain gauges are at

A

\(0^\circ \) with respect to the axis of the shaft

B

\(30^\circ \) with respect to the axis of the shaft

C

\(45^\circ \) with respect to the axis of the shaft

D

\(90^\circ \) with respect to the axis of the shaft

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14

2020 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Mechanical Quantity Measurement

Instrumentation Engineering (IN) 2020

The mutual inductances between the primary coil and the secondary coils of a linear variable differential transformer (LVDT) shown in the figure are M_1 and M_2. Assume that the self-inductances L_{S1} and L_{S2} remain constant and are independent of x. When x = 0, M_1 = M_2 = M_0. When x is in the range ±10 mm, M_1 and M_2 change linearly with x. At x = +10 mm or −10 mm, the change in the magnitudes of M_1 and M_2 is 0.25 M_0. For a particular displacement x = D, the voltage across the detector becomes zero when |V_2| = 1.25|V_1|. The value of D (in mm, rounded off to one decimal place) is ____

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