Flow, Temperature, Level and Chemical Measurements - Sensors and Industrial Instrumentation - Instrumentation Engineering Previous Year Questions

1

2009 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Flow, Temperature, Level and Chemical Measurements

Instrumentation Engineering (IN) 2009

The figure shows the cross-sectional diagram of an orifice flow meter with an orifice radius \(R\). Point 'a' is \(30R\) upstream while points 'b' and 'c' are \(0.8R\) and \(30R\) downstream from the orifice respectively. The pressures at points a, b and c are \(P_a\), \(P_b\) and \(P_c\) respectively. Then

A

\(P_c > P_b > P_a\)

B

\(P_b > P_c > P_a\)

C

\(P_a > P_b > P_c\)

D

\(P_a > P_c > P_b\)

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2

2010 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Flow, Temperature, Level and Chemical Measurements

Instrumentation Engineering (IN) 2010

A differential pressure transmitter is used to measure the flow rate in a pipe. Due to aging, the sensitivity of the pressure transmitter is reduced by 5%. All other aspects of the flow meter remaining constant, change in the sensitivity of the flow measurement is

A

10.0%

B

5.0%

C

2.5%

D

2.2%

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3

2011 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Flow, Temperature, Level and Chemical Measurements

Instrumentation Engineering (IN) 2011

A turbine flowmeter is rotating at 72 rpm. The flux Ψ linked to the nearby magnet and coil assembly is given by \(Ψ(θ) = 3 + cos(4θ)\) mWb, where θ is the angular position (in radian). The amplitude and frequency of the output voltage signal, respectively, are

A

4 mV and 45.8 Hz

B

30.2 mV and 4.8 Hz

C

30.2 mV and 30.2 Hz

D

288 mV and 45.8 Hz

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4

2011 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Flow, Temperature, Level and Chemical Measurements

Instrumentation Engineering (IN) 2011

When the intensity of radiation received by the floating detector is half of the intensity detected initially, the level of water is

A

1.09 m

B

1.5 m

C

1.8 m

D

1.9 m

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5

2013 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Flow, Temperature, Level and Chemical Measurements

Instrumentation Engineering (IN) 2013 [Session 1]

The differential pressure transmitter of a flow meter using a venturi tube reads 2.5 × 10^5 Pa for a flow rate of 0.5 m³/s. The approximate flow rate in m³/s for a differential pressure 0.9 × 10^5 Pa is

A

0.30

B

0.18

C

0.83

D

0.60

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6

2013 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Flow, Temperature, Level and Chemical Measurements

Instrumentation Engineering (IN) 2013 [Session 1]

The thermal time constant of the hot wire under flowing air condition in ms is

A

24.5

B

12.25

C

6.125

D

3.0625

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7

2013 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Flow, Temperature, Level and Chemical Measurements

Instrumentation Engineering (IN) 2013 [Session 2]

Match the following biomedical instrumentation techniques with their applications
P : Otoscopy U : Respiratory volume measurement
Q : Ultrasound Technique V : Ear diagnostics
R : Spirometry W : Echo-cardiography
S : Thermodilution Technique X : Heart volume measurement

A

P-U, Q-V, R-X, S-W

B

P-V, Q-U, R-X, S-W

C

P-V, Q-W, R-U, S-X

D

P-V, Q-W, R-X, S-U

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8

2013 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Flow, Temperature, Level and Chemical Measurements

Instrumentation Engineering (IN) 2013 [Session 2]

The differential pressure transmitter of a flow meter using a venturi tube reads \(2.5 \times 10^5\) Pa for a flow rate of 0.5 m³/s. The approximate flow rate in m³/s for a differential pressure \(0.9 \times 10^5\) Pa is

A

0.30

B

0.18

C

0.83

D

0.60

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9

2014 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Flow, Temperature, Level and Chemical Measurements

Instrumentation Engineering (IN) 2014

The pressure and velocity at the throat of a Venturi tube, measuring the flow of a liquid, are related to the upstream pressure and velocity, respectively, as follows:

A

pressure is lower but velocity is higher

B

pressure is higher but velocity is lower

C

both pressure and velocity are lower

D

pressure and velocity are identical

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10

2014 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Flow, Temperature, Level and Chemical Measurements

Instrumentation Engineering (IN) 2014

For a rotameter, which one of the following statements is TRUE?

A

the weight of the float is balanced by the buoyancy and the drag force acting on the float

B

the velocity of the fluid remains constant for all positions of the float

C

the measurement of volume flow rate of gas is not possible

D

the volume flow rate is insensitive to changes in density of the fluid

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11

2014 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Flow, Temperature, Level and Chemical Measurements

Instrumentation Engineering (IN) 2014

A transit time ultrasonic flowmeter uses a pair of ultrasonic transducers placed at 45° angle, as shown in the figure. The inner diameter of the pipe is 0.5 m. The differential transit time is directly measured using a clock of frequency 5 MHz. The velocity of the fluid is small compared to the velocity of sound in the static fluid, which is 1500 m/s and the size of the crystals is negligible compared to the diameter of the pipe. The minimum change in fluid velocity (m/s) that can be measured using this system is ______________.

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12

2024 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Flow, Temperature, Level and Chemical Measurements

Instrumentation Engineering (IN) 2024

The pressure drop across a control valve is constant. The control valve with inherent characteristic has decreasing sensitivity. If \( x \) represents the fraction of maximum stem position of the control valve, then the function \( f(x) \) representing the fraction of maximum flow is

A

\(\alpha^{x-1} \), where \(\alpha \) is constant

B

\(\sqrt{x} \)

C

\(x \)

D

\(x^2 \)

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13

2007 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Flow, Temperature, Level and Chemical Measurements

Instrumentation Engineering (IN) 2007

In \(N_2\)-washout estimation of lung volume using spirometry, the lung volumes at the beginning and the end of the washout are the same. Let \(T_i\), \(V_i\) and \(F\) denote temperature, volume and molar fraction (of \(N_2\)) respectively; subscripts \(S\) and \(L\) denote the spirometer and the lung; and \(t_1\) and \(t_2\) the beginning time and the end time of the experiment, respectively. Then

A

\(V_L = \frac{T_L}{T_S} \left[ \frac{F_S(t_2) V_S(t_2)}{F_L(t_1) - F_L(t_2)} \right]\)

B

\(V_L = \frac{T_L}{T_S} \left[ \frac{F_L(t_2) V_S(t_2)}{F_L(t_1) - F_L(t_2)} \right]\)

C

\(V_L = F_L(t_1) V_L(t_2)\)

D

\(V_L = T_S F_S(t_2) V_S(t_2)\)

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14

2007 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Flow, Temperature, Level and Chemical Measurements

Instrumentation Engineering (IN) 2007

The accompanying figure shows a VERTICAL venturimeter with upward water flow. When the measured static pressure difference, \(p_1 - p_2\), between the inlet and the throat is 30 kPa, the flow rate is found to be 50 litres per second. Assume that the coefficient of discharge remains the same.
When \(p_1 - p_2 = 20\) kPa, the flow rate, in litres per second, is

A

33.3

B

39.3

C

40.8

D

54.2

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15

2007 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Flow, Temperature, Level and Chemical Measurements

Instrumentation Engineering (IN) 2007

In a laminar flow experiment, Fluid A is pumped through a straight tube and the volumetric flow rate and pressure drop per unit length are recorded. In a second straight tube having twice the internal diameter of the first one, Fluid B records the same pressure drop per unit length at the same volumetric flow rate. Assuming fully developed flow conditions in the tubes, the ratio of the dynamic viscosity of Fluid B to that of Fluid A is

A

16

B

32

C

64

D

128

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16

2007 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Flow, Temperature, Level and Chemical Measurements

Instrumentation Engineering (IN) 2007

Signal processing limitations constrain the maximum Doppler shift to be less than 3 kHz. The maximum source frequency (probe output), to the nearest MHz, should be

A

2 MHz

B

3 MHz

C

5 MHz

D

10 MHz

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17

2017 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Flow, Temperature, Level and Chemical Measurements

Instrumentation Engineering (IN) 2017

The most suitable pressure gauge to measure pressure in the range of 10^{-4} to 10^{-3} torr is

A

Bellows

B

Barometer

C

Strain gauge

D

Pirani gauge

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18

2017 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Flow, Temperature, Level and Chemical Measurements

Instrumentation Engineering (IN) 2017

The pressure drop across an orifice plate for a particular flow rate is 5 kg/m². If the flow rate is doubled (within the operating range of the orifice), the corresponding pressure drop in kg/m² is

A

2.5

B

5.0

C

20.0

D

25.0

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19

2017 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Flow, Temperature, Level and Chemical Measurements

Instrumentation Engineering (IN) 2017

The magnetic flux density of an electromagnetic flowmeter is \(100 \text{ mWb/m}^2\). The electrodes are wall-mounted inside the pipe having a diameter of \(0.25 \text{ m}\). A voltage of \(1 \text{ V}\) is generated when a conducting fluid is passed through the flowmeter. The volumetric flowrate of the fluid in \(\text{m}^3/\text{s}\) is __________.

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20

2018 · Instrumentation Engineering · Sensors and Industrial Instrumentation · Flow, Temperature, Level and Chemical Measurements

Instrumentation Engineering (IN) 2018

The average velocity \(v\) of flow of clear water in a 100 cm (inner) diameter tube is measured using the ultrasonic flow meter as shown in the figure. The angle \(\theta\) is 45°. The measured transit times are \(t_1 = 0.9950\) ms and \(t_2 = 1.0000\) ms. The velocity \(v\) (in m/s) in the pipe is (up to one decimal place) ______.

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