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Test: Measurement of Flow - GATE MCQ


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15 Questions MCQ Test - Test: Measurement of Flow

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Test: Measurement of Flow - Question 1

In a 30-in diameter pipe, a circular orifice has a diameter of 20 in, and the difference in the height of the manometer levels is 2.3 ft. What is the flow rate in cubic feet per second if K is 0.97?

Detailed Solution for Test: Measurement of Flow - Question 1

The flow rate Q in a differential flow rate meter is given by

Q = K(π/4)(ds/dp)2√2gh

where K is the flow coefficient constant, dS is the diameter of the orifice, dP is the

pipe diameter and h is the difference in height between PH and PL.

Q= 0.97 (3.14/4)(20/30)2

Q= 4.12 ft3/sec

Test: Measurement of Flow - Question 2

Compared to the upstream to the throat of a venturi meter, which of the following is true

Detailed Solution for Test: Measurement of Flow - Question 2
Comparing the upstream to the throat of a venturi meter, the pressure decreases, and velocity increases.
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Test: Measurement of Flow - Question 3

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 ψ is the angular position (in radian). The amplitude and frequency of the output voltage signal, respectively, are

Detailed Solution for Test: Measurement of Flow - Question 3

ψ (θ ) = 3 + cos (4θ)

f = 72/60 rev/sec

f = 1.2 rev/sec

V = - = 4 sinθ dθ/dt = 4 sin4θ x (2 πf)

V = 8π f sin 4θ

V = 30.2 sin 4θ

Frequency of o/p voltage = 4 f = 4.8 Hz

Amplitude = 30.2 mV

Test: Measurement of Flow - Question 4

Match the following :

Detailed Solution for Test: Measurement of Flow - Question 4
Radiation Pyrometer: Iemf

Gyroscope Angular: Velocity

Test: Measurement of Flow - Question 5

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

Detailed Solution for Test: Measurement of Flow - Question 5
Change is the sensitivity of transmitter = Sensitivity of flow measurement

Sensitivity is reduced by 5%.

Since other parameters are constant, hence sensitivity of flow measurement also reduces by 5%.

Test: Measurement of Flow - Question 6

The accompanying figure shows a VERTICAL venturi meter with upward water flow. When the measured static pressure difference, p1 – p2, between the inlet and the throat is 30 kPa, the flow rate is found to be 50 liters per second. Assume that the coefficient of discharge remains the same.

When p1 – p2 = 20 kPa, the flow rate, in litres per second, is

Detailed Solution for Test: Measurement of Flow - Question 6

Test: Measurement of Flow - Question 7

In a rotameter, used for measuring the flow rate of a fluid, Pa: pressure above the float, Pb: pressure below the float, A: area of float, V: volume of the float, d1: density of float material, d2: density of the fluid, g: acceleration due to gravity. The following equation describes the equilibrium of the float.

Detailed Solution for Test: Measurement of Flow - Question 7

(Difference in pressure) × A = weight of float –Buoyancy force

or (Pb – Pa) A =Vg (d2 – d1)

Test: Measurement of Flow - Question 8

The velocity of water flow (density 1000 kg/m3) in a horizontal pipe is measured using the PITOT tube shown below. The fluid in the U-tube manometer is mercury with a density of 13534 kg/m3. Assume g = 9.81 m/s2. If the height difference (h) is measured as 94.1 mm, the velocity of flow of water in m/s is

Detailed Solution for Test: Measurement of Flow - Question 8

The velocity of flow of water

V = √2gh

h = (Sm / S) - 1 = 94.1 x 10-3 x {(13534/1000) - 1}

h = 1.18 m

Putting values, we get

V = 4.81m/sec

Test: Measurement of Flow - Question 9

If all particle of fluid has a path parallel to the wall, it is known as ____________

Detailed Solution for Test: Measurement of Flow - Question 9
If all fluid particles have a parallel path with a wall, it is called laminar flow, known as viscous flow and streamline flow.
Test: Measurement of Flow - Question 10

Which of the following represents the Reynolds number for laminar flow?

Detailed Solution for Test: Measurement of Flow - Question 10
Reynolds number indicates the flow of fluid; for a Reynolds number less than 2000, fluid is said to be in laminar flow. For greater than 4000, fluid is said to be in a turbulent flow.
Test: Measurement of Flow - Question 11

Which instrument measures velocity at a point of the fluid in a stream?

Detailed Solution for Test: Measurement of Flow - Question 11
Pitot-static tubes are the devices used for measuring the velocity of the fluid.
Test: Measurement of Flow - Question 12

Which of the following represents obstruction type flow measuring systems?

Detailed Solution for Test: Measurement of Flow - Question 12
In such systems, the flow rate is measured by making an obstruction in the path of flow.
Test: Measurement of Flow - Question 13

Which of the following represents the correct relation between flow rate and pipe area?

Detailed Solution for Test: Measurement of Flow - Question 13
Flow rate and area of the cross-section of pipe are directly proportional. When the area of the pipe is increased, the flow rate also increases.
Test: Measurement of Flow - Question 14

Which of the following converts flow to rotational motion?

Detailed Solution for Test: Measurement of Flow - Question 14
Rotatic vane system is used to measure the flow rate of fluid, in which flow is converted into rotational motion.
Test: Measurement of Flow - Question 15

Centrifugal force elements are used for ___________

Detailed Solution for Test: Measurement of Flow - Question 15
Centrifugal force element for measuring flow rate is only applicable for high flow rate, below which it doesn’t produce any recognizable change.
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