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PRESSURE & VELOCITY FLOW METERS MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS

Byadmin

PRESSURE & VELOCITY FLOW METERS

MULTIPLE CHOICE QUESTIONS

(MCQ) WITH ANSWERS ON

 

MCQ help a lot in deep understanding

of pressure and velocity flow meters.

The degree of clarity is greatly increased.

Venturimeter, orifice meter and Rota meter

are flow measuring devices operated by

pressure difference. Venturimeter works

on the conservation of energy. There are

four types of Orifice meters. Each is

specified for a specific purpose. Pitot tube

is velocity operated. It is a L shaped tube. It

measures liquid or gas fluid flow.

PRESSURE FLOW METERS-Venturimeter, Orifice & Rota meter

Fig. Venturimeter

Fig. Orifice Meter

Fig. Rotameter

  1. Venturimeter measures

  1. Volumetric flow rate

  2. Mass flow rate

  3. Both (a) & (b)

  4. None

ANS: (a)

  1. The number of parts of a pressure operated Venturimeter is

  1. 1

  2. 2

  3. 3

  4. None

ANS: (c)

  1. The various parts of a Venturimeter are

  1. Firstly a short converging portion, throat and an orifice

  2. A short converging portion, throat and a long diverging portion

  3. Both (a) & (b)

  4. None

ANS: (b)

  1. A Venturimeter works on the principle of

  1. Conservation of mass

  2. Conservation of energy

  3. Both (a) & (b)

  4. None

ANS: (b)

  1. Venturimeter works on the theorem of

  1. Archimedes

  2. Bernoulli’s

  3. Both (a) &(b)

  4. None

ANS: (b)

  1. Venturimeter measures the volumetric flow rate of a fluid flowing through a

  1.  Flat plate

  2.  Pipe

  3.  Channel

  4. None

ANS: (b)

  1. Equation for theoretical discharge through a Venturimeter is

  1. Firstly          Q th =(A1A2(gh)5)/(A12—A22)

  2. Secondly      Q th =(A1A2(2gh)5)/(A12—A22)

  3. Thirdly          Q th=(A1A2(2gh)5)/(A12—A22)0.5

  4. None

ANS: (c)

  1. Equation for real discharge through a Venturimeter is

  1. Firstly          Q actual= (A1A2(2gh)5)/(A12—A22)

  2. Secondly     Q actual=Cc (A1A2(2gh)5)/(A12—A22)

  3. Thirdly         Q actual = Cd (A1A2(2gh)5)/(A12—A22)0.5

  4. None

ANS: (c)

  1. The value of the coefficient of discharge through a Venturimeter is

  1. > 1

  2. < 1

  3. =1

  4. None

ANS: (b)

  1. The value of ‘h’ in Venturimeter equation is found by using a

  1. Pitot tube

  2. Manometer

  3. Differential manometer

  4. None

ANS: (c)

  1. Value of ‘h’ in Venturimeter depends on fluid flowing through pipe. Fluid in Venturimeter is heavier than fluid in manometer. S is specific gravity.

  1. Firstly        h = x(SH/SL—1)

  2. Secondly   h =x (SL/SH –1)

  3. Thirdly       h= x(1—SL/SH)

  4. None

ANS: (c)

  1. Value of ‘h’ in Venturimeter depends on fluid flowing through pipe is lighter than fluid in manometer.  S is specific gravity

  1. Firstly          h = x(SH/SL—1)

  2. Secondly      h =x (SL/SH –1)

  3. Thirdly          h= x(1—SL/SH)

  4. None

ANS: (a)

  1. An orifice meter measures the volumetric flow rate of a

  1. Liquid

  2. Gas

  3. Both (a) & (b)

  4. None

ANS: (c)

  1. The most common fluid for which Orifice meter used is

  1. Water

  2. Steam

  3. Nitrogen gas

  4. None

ANS: (b)

  1. Orifice meter is a meter which works with

  1. Temperature difference

  2. Pressure difference

  3. Both (a) & (b)

  4. None

ANS: (b)

  1. A pressure operated Orifice meter consists of a

  1. Circular hole in an Orifice plate placed in line of flow

  2. Rectangular hole in a plate

  3. Elliptical hole in a plate

  4. None

ANS: (a)

  1. The pressure drop across an Orifice meter is

  1. Parabolic

  2. Linear

  3. Curvilinear

  4. None

ANS: (b)

  1. An Orifice meter needs

  1. Calibration

  2. No calibration

  3. Double calibration

  4. None

ANS: (a)

  1. Pressure drop across the Orifice meter is measured with

  1. Pressure gages

  2. Manometer

  3. Pitot tube

  4. None

ANS: (b)

  1. The fluid comes out the Orifice meter in the form of a

  1. Single Jet

  2. Double jet

  3. Multi jet

  4. None

ANS: (a)

  1. As the fluid approaches the Orifice meter, pressure

  1. Increases slightly

  2. Decreases slightly

  3. No change

  4. None

ANS: (a)

  1. As the fluid passes through the Orifice meter, pressure drop continues up to a point of

  1. Contraflexre

  2. Contraction

  3. Vena-Contracta

  4. None

ANS: (c)

  1. The pressure difference across the Orifice meter is proportional

  1. Velocity of flow

  2. Square of the velocity of flow

  3. Cube of velocity of flow

  4. None

ANS: (b)

  1. The pressure difference across the Orifice meter is proportional

  1. Rate of Mass flow

  2. Cube of Rate of mass flow

  3. Both (a) & (b)

  4. None

ANS: (d)

  1. The most common material of Orifice plate is

  1. Copper

  2. Mild steel

  3. Stainless steel

  4. None

ANS: (c)

  1. Types of Orifice plates are

  1. Concentric Orifice Plate &Eccentric Orifice Plate

  2. Segment Orifice Plate & Quadrant Edge Orifice Plate

  3. Both (a) & (b)

  4. None

ANS: (c)

  1. Concentric Orifice plate is used for the flow of

  1. Clean liquids

  2. Steam

  3. Both (a) & (b)

  4. None

ANS: (c)

  1. Eccentric Orifice plate is used for the flow of

  1. Fluids having solid particles

  2. Oil containing water

  3. Both (a) & (b)

  4. None

ANS: (c)

  1. The shape of the Segment Orifice meter is in the form of a

  1. Semi-circle

  2. Segment of a circle

  3. Both (a) & (b)

  4. None

ANS: (c)

  1. The diameter of the Segment Orifice meter is

  1. 49 % of pipe diameter

  2. 98 % of pipe diameter

  3. Both (a) & (b)

  4. None

ANS: (b)

  1. Segment Orifice meter is used for the flow of

  1. Light slurries

  2. Heavy slurries

  3. Both(a) & (b)

  4. None

ANS: (a)

  1. The Diameter of quadrant radius Orifice plate is

  1. Diameter of the pipe

  2. Half the diameter of pipe

  3. (1/4) diameter of the pipe

  4. None

ANS: (b)

  1. Quadrant radius Orifice meter is used for the flow of

  1. Low viscous fluids

  2. Highly viscous fluids

  3. Water

  4. None

ANS: (b)

34. Rota meter has a cross section which is

  1. Constant

  2. Variable

  3. Partially constant & partially variable

  4. None

ANS: (b)

35. A Rota meter measures

  1. Mass flow rate

  2. Volumetric flow rate

  3. Both (a) & (b)

  4. None

ANS: (b)

36. In a Rota meter, during flow measurement, float is moving

  1. Up & down

  2. Moving upstream

  3. Moving down steam

  4. None

ANS: (d)

37. In a Rota meter, during flow measurement, float is

  1. Moving slowly

  2. Stationary

  3. Moving fast

  4. None

ANS: (b)

38. The flow measurement is with

  1. Graduated Rota meter tube

  2. Non-graduated Rota meter tube

  3. Can’t say

  4. None

ANS: (a)

39. A Rotameter measures the flow rate of a

  1. Liquid

  2. Gas

  3. Both liquid and gas

  4. None

ANS: (c)

40. A Rota meter measures

  1. Very low flow rates

  2. High flow rates

  3. Very low to high flow rates

  4. None

ANS: (c)

41. Rota meter operates with

  1. Electrical energy

  2. Solar energy

  3. Heat energy

  4. None

ANS: (d)

42. A Rota meter is

  1. Low cost

  2. Medium cost

  3. High cost

  4. None

ANS: (a)

43. A Rota meter is

  1. Easy to install

  2. Difficult to install

  3. Can’t say

  4. None

ANS: (a)

44. Pressure drop in the Rota meter is

  1. Small

  2. Medium

  3. High

  4. None

ANS: (a)

45. A Rota meter measures flow rate in a

  1. Closed conduit

  2. Open channel

  3. Both (a) & (b0

  4. None

ANS: (a)

46. Float in the Rota meter is pushed up by

  1. Drag force

  2. Gravitational force

  3. Both (a) & (b)

  4. None

ANS: (a)

47. The float of a Rota meter is

  1. Lighter than the fluid

  2. Heavier than the fluid

  3. Of same density as the fluid

  4. None

ANS: (b)

48. Normally a Rota meter is made of

  1. Stainless steel

  2. Copper

  3. Glass

  4. None

ANS: (c)

49. A Rota meter is installed

  1. Horizontally

  2. Vertically

  3. Inclined

  4. None

ANS: (b)

50. A Rota meter has a

  1. Low level of repeatability

  2. Medium level of repeatability

  3. High level of repeatability

  4. None

ANS: (c)

VELOCITY FLOW METER

Static pressure +dynamic pressure = Total pressure

ps + ρ v2/2 = pt

v2 =2(pt-ps)/ρ =2gh

Fig. Pitot Tube

51. The Pitot tube is a

  1. T shaped tube

  2. L shaped tube

  3. Both (a) & (b)

  4. None

ANS: (b)

52. The opening of the Pitot tube is

  1. Opposite to the direction of flow

  2. Same direction of flow

  3. At right angles to the direction of flow

  4. None

ANS: (a)

53. Pitot tube measures the flow rate of

  1. Single phase liquid or gas

  2. Two phase fluids

  3. Three phase fluids

  4. None

ANS: (a)

54. The two pressures used in a Pitot tube are

  1. Firstly Static and kinetic pressures

  2. Static & total impact pressures

  3. Static & manometer pressures

  4. None

ANS: (b)

55. The static pressure in the Pitot tube is

  1. Firstly            Operating pressure in the tube

  2. Secondly       (Operating + kinetic) pressure in the tube

  3. Thirdly           (Operating- kinetic) pressure in the tube

  4. None

ANS: (a)

56. Static pressure in case of Pitot tube is measured in the

  1. Direction of fluid flow

  2. Perpendicular direction to the fluid flow

  3. Both (a) & (b)

  4. None

ANS: (b)

57. Pitot tube is used in a

  1. Laminar flow

  2. Turbulent flow

  3. Highly turbulent flows

  4. None

ANS: (c)

58. Pitot tube is used to measure the velocity of a

  1. Clean fluid

  2. Contaminated fluid

  3. Both (a) & (b)

  4. None

ANS: (a)

https://www.mesubjects.net/wp-admin/post.php?post=4707&action=edit       Flow measuring meters

https://www.mesubjects.net/wp-admin/post.php?post=6411&action=edit       Bernoulli’s Energy Momentum equations

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