Pipe1 Flashcards

1
Q

Flows through multi - loop systems may be computed by:

a. ) any closed - form solution of simultaneous equations
b. ) the Hardy-Cross method
c. ) trial and error
d. ) all of the above

A

all of the above

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2
Q

What is the pressure at the exit of a draft tube in a turbine?

a. ) below atmospheric
b. ) vacuum
c. ) atmospheric
d. ) gage

A

Atmospheric

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3
Q

Which of the following is not a similarity between a submerged culvert and a siphon?

a. ) they both operate full
b. ) Torricelli’s equation holds
c. ) Both can experience entrance and exit losses
d. ) In both, the water flows downhill

A

Torricelli’s equation holds

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4
Q

The volume flow passes through a venturimeter is:

a. ) increasing
b. ) decreasing
c. ) constant
d. ) varying

A

Constant

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5
Q

The matching of scale model and full-scale results for a fluid dynamic phenomena involving compressible fluids requires equality of:

a. ) Reynolds number
b. ) Froude number
c. ) Cauchy number
d. ) Mach number

A

Mach number

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6
Q

The fact that a fluid’s velocity increases as the cross sectional area of the pipe through which it flow decreases due to:

a. ) Bernoulli’s equation
b. ) The continuity equation
c. ) The momentum equation
d. ) The perfect gas law

A

The continuity equation

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7
Q

Once could expect the possibility of Froude number similarity in all of the following cases except:

a. ) Surface ships
b. ) Surface wave motion
c. ) Flow over weirs
d. ) Closed-pipe turbulent pipe flow

A

Closed-pipe turbulent pipe flow

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8
Q

One could expect the possibility of Froude number similarity in all of the following cases except:

a. ) motion of a fluid jet
b. ) flow over spillways
c. ) surge and flood waves
d. ) subsonic airfoils

A

Subsonic airfoils

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9
Q

One could expect the possibility of Reynolds number similarity in all of the following cases except:

a. ) pumps
b. ) fans
c. ) turbines
d. ) weirs

A

Weirs

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10
Q

Flow measuring devices include all of the following except:

a. ) flow nozzles
b. ) venture area meters
c. ) pitot tubes
d. ) precision tachometer

A

Precision tachometers

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11
Q

The following are examples indirect (secondary) measurements to measure flow rates using obstruction meters except:

a. ) pitot static meters
b. ) static pressure probes
c. ) weight and mass scales
d. ) direction - sensing probes

A

Weight and mass scales

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12
Q

The lowest portion to storage basing from where the water is not drawn is:

a. ) bottom storage
b. ) sub-soil storage
c. ) spring reserve
d. ) dead storage

A

Dead storage

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13
Q

In turbine installation, the air is removed from the condenser by:

a. ) air pump
b. ) air injector
c. ) air ejector
d. ) air compressor

A

Air Ejector

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14
Q

A type of water turbine where a jet of water is made to fall on the blades or buckets and due to the impulse of water, the turbine starts to move

a. ) Pelton wheel
b. ) Steam turbine
c. ) Francis turbine
d. ) Reaction turbine

A

Pelton wheel

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15
Q

An impulse turbine are used for:

a. ) low head
b. ) medium head
c. ) high head
d. ) very low head

A

High Head

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16
Q

In a hydro-electric plant using a Francis turbine with medium head, the speed can be regulated using the:

a. ) deflector gage
b. ) nozzle
c. ) wicket gate
d. ) weir

A

Wicket gate

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17
Q

Venturi meters, pitot static gauges, orifice meters, flow nozzles, and differential manometers all depend upon the relationship between:

a. ) flow velocity and friction
b. ) flow velocity and pressure
c. ) friction and pressure
d. ) pressure and mass flow

A

Flow velocity and pressure

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18
Q

Flow measuring devices include all of the following except:

a. ) orifice plate meters
b. ) hot-wire anemometers
c. ) magnetic flow meters
d. ) mercury barometer

A

Mercury barometer

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19
Q

The water hammer phenomenon is primarily what kind of fluid mechanics?

a. ) Static (a phenomena independent of time)
b. ) Dynamic (a time-dependent phenomena)
c. ) Compressible
d. ) Incompressible

A

Dynamic (a time-dependent phenomena)

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20
Q

In series pipe systems, all of the following parameters vary from section to section except:

a. ) pressure drop
b. ) friction loss
c. ) head loss
d. ) mass flow

A

Mass flow

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21
Q

All of the following are forms of drag on a body moving through a fluid except:

a. ) skin friction
b. ) wake drag
c. ) profile drag
d. ) d’ Alembert’s paradox drag

A

d’ Alembert’s paradox drag

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22
Q

In the absence of any heat and work interactions and and changes in potential energy, the stagnation enthalpy of a fluid remains constant during:

a. ) unsteady flow
b. ) steady flow
c. ) turbulent flow
d. ) variable flow

A

Steady flow

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23
Q

Flow measuring devices include all of the following except:

a. ) venturi meters
b. ) static pressure probes
c. ) turbine and propeller meters
d. ) magnetic dynamometers

A

Magnetic dynamometers

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24
Q

Once could expect the possibility of Reynolds number similarity in all of the following cases except:

a. ) pumps
b. ) fans
c. ) trubines
d. ) weirs

A

Weirs

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25
Q

Expansion factors take into account the:

a. ) area of the vena contracta
b. ) small effect of friction and turbulence of the orifice
c. ) changes in diameters of a converging pipe
d. ) effects of compressibility

A

Effects of compressibility

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26
Q

A vena contracta in a fluid jet issuing through a hole in a plate is located approximately:

a. ) 10 diameters downstream of the hole
b. ) at jet’s minimum diameter
c. ) at the orifice minimum diameter
d. ) at the orifice maximum diameter

A

At jet’s minimum diameter

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27
Q

In the deep well installation or operation, the difference between static water level and operating water level is known as ___

a. ) suction lift
b. ) drawdown
c. ) priming level
d. ) clogging

A

Drawdown

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28
Q

The primary purpose of a turbine in a fluid loop is to:

a. ) add energy to the flow
b. ) add mass to the flow
c. ) extract energy from the flow
d. ) none of the above

A

Extract energy from the flow

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29
Q

The coefficient of discharge is the ratio of the:

a. ) area of vena contracta to the orifice area
b. ) actual discharge to the theoretical discharge
c. ) actual velocity to the theoretical velocity
d. ) effective head to the actual head

A

Actual discharge to the theoretical discharge

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30
Q

All of the following fluid phenomena are based on the force momentum principle of a flowing fluid except:

a. ) turbines
b. ) Pelton wheels
c. ) Diesel automobile engines
d. ) jet engines

A

Diesel automobile engines

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31
Q

The lowest portion to storage basin from where the water is not drawn is:

a. ) bottom storage
b. ) sub-soil storage
c. ) spring reserve
d. ) dead storage

A

Dead storage

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32
Q

The following are all examples of indirect (secondary) miscellaneous methods to measure flow except:

a. ) turbine and propeller meters
b. ) pitot static meters
c. ) positive displacement meters
d. ) magnetic flow meters

A

Positive displacement meters

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33
Q

The magnitude of the drag coefficient of a sphere in water is dependent upon all of the following except:

a. ) fluid density
b. ) fluid viscosity
c. ) units of measure (SI or English Engineering System)
d. ) drag force

A

Units of measure (SI or English Engineering System)

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34
Q

A draft tube is a part of which power plants?

a. ) Diesel engine power plant
b. ) Gas turbine power plant
c. ) Steam power plant
d. ) Hydro-electric power plant

A

Hydro-electric power plant

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35
Q

Flows through multi-loop system may be computed by:

a. ) any closed-form solution of simultaneous equations
b. ) the Hardy-Cross method
c. ) trial and error
d. ) all of the above

A

All of the above

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36
Q

The coefficient of discharge is the ratio of the

a. ) area of vena contracta to the orifice area
b. ) actual discharge to the theoretical discharge
c. ) actual velocity to the theoretical velocity
d. ) effective head to the actual head

A

Actual discharge to the theoretical discharge

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37
Q

Hydraulic jump is used to:

a. ) increase the flow rate
b. ) reduce the flow rate
c. ) reduce the velocity of flow
d. ) reduce the energy of flow

A

Reduce the energy of flow

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38
Q

What is the use of a Hydraulic jump?

a. ) increase the flow rate
b. ) reduce the flow rate
c. ) reduce the velocity of flow
d. ) reduce the energy of flow

A

Reduce the energy of flow

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39
Q

Pitot tube is use to measure the:

a. ) velocity of mass
b. ) velocity of pipe
c. ) flow
d. ) velocity of flow

A

Velocity of flow

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40
Q

In a hydro-electric plant using a Francis turbine with medium head, the speed can be regulated using the:

a. ) deflector gage
b. ) nozzle
c. ) wicket gate
d. ) weir

A

Wicket gate

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41
Q

The following are examples of indirect (secondary) measurements to measure flow rates using obstruction meters except:

a. ) variable area meters
b. ) venture meters
c. ) volume tanks
d. ) flow nozzles

A

Volume tanks

42
Q

An impulse turbine has:

a. ) low head
b. ) medium head
c. ) high head
d. ) very low head

A

High head

43
Q

A Kaplan turbine is:

a. ) a high head mixed flow turbine
b. ) an inward flow impulse turbine
c. ) an outward flow reaction turbine
d. ) low head axial flow turbine

A

Low head axial flow turbine

44
Q

A vena contracta in a fluid jet issuing through a hole in a plate is located approximately:

a. ) 10 diameters downstream of the hole
b. ) at jet’s minimum diameter
c. ) at the orifice minimum diameter
d. ) at the orifice maximum diameter

A

At jet’s minimum diameter

45
Q

The coefficient of discharge is the ratio of the

a. ) area of vena contracta to the orifice area
b. ) actual discharge to the theoretical discharge
c. ) actual velocity to the theoretical velocity
d. ) effective head to the actual head

A

Actual discharge to the theoretical discharge

46
Q

Which of the following is a characteristic of an impulse turbine?

a. ) Steam striking blades on angle
b. ) No steam reaction to velocity
c. ) Steam striking blades at zero angle
d. ) Steam reversing direction

A

Steam striking blades at zero angle

47
Q

In parallel pipe system originating and terminating in common junctions:

a. ) mass flows through each branch are equal
b. ) pressure drops through each branch are equal
c. ) lengths of each branch are equal
d. ) flow areas of each branch are equal

A

Pressure drops through each branch are equal

48
Q

One could expect the possibility of Froude number similarity in all of the following cases except:

a. ) surface ships
b. ) surface wave motion
c. ) flow over weirs
d. ) closed-pipe turbulent pipe flow

A

Closed-pipe turbulent pipe flow

49
Q

Which of the following is not a similarity between a submerged culvert and a siphon?

a. ) They both operate full
b. ) Torricelli’s equation holds
c. ) Both can experience entrance and exit losses
d. ) In both, the water flows downhill

A

Torricelli’s equation holds

50
Q

When a falling object reaches a speed at which the drag force equals its weight, it has achieved:

a. ) Mach one
b. ) a laminar boundary layer
c. ) a turbulent boundary layer
d. ) terminal velocity

A

A turbulent boundary layer

51
Q

In turbine installation, the air is removed from the condenser by __

a. ) air pump
b. ) air injector
c. ) air ejector
d. ) air jet

A

Air Ejector

52
Q

The following are examples indirect (secondary) measurements to measure flow rates using obstruction meters except:

a. ) pitot static meters
b. ) static pressure probes
c. ) weight and mass scales
d. ) direction - sensing probes

A

Weight and mass scales

53
Q

High head turbine is a/an:

a. ) Impulse
b. ) Francis
c. ) Reaction
d. ) Propeller

A

Impulse

54
Q

Which of the following is a type of water turbine?

a. ) Parson
b. ) Hero
c. ) Pelton
d. ) Bankl

A

Pelton

55
Q

In parallel pipe system originating and terminating in common junctions:

a. ) mass flows through each branch are equal
b. ) pressure drops through each branch are equal
c. ) lengths of each branch are equal
d. ) flow areas of each branch are equal

A

Pressure drops through each branch are equal

56
Q

The primary purpose of a turbine in a fluid loop is to:

a. ) add energy to the flow
b. ) add mass to the flow
c. ) extract energy from the flow
d. ) none of the above

A

Extract energy from the flow

57
Q

In a hydro-electric plant using a Francis turbine with medium head, the speed can be regulated using the:

a. ) deflector gage
b. ) nozzle
c. ) wicket gate
d. ) weir

A

Wicket gate

58
Q

The matching of scale model and full-scale prototype results for a fluid dynamic phenomena involving a fully submerged body requires equality of:

a. ) Reynolds number
b. ) Weber number
c. ) Froude number
d. ) Mach numer

A

Reynolds number

59
Q

In the deep well installation or operation, the difference between static water level and operating water level is called __

a. ) suction
b. ) drawdown
c. ) priming level
d. ) clogging

A

Drawdown

60
Q

In fluid flow, linear momentum is:

a. ) a vector quantity equal to the product of mass and velocity
b. ) a scalar quantity equal to the product mass and velocity
c. ) a scalar quantity to the product of force and length of time is applied
d. ) the change in impulse

A

A vector quantity equal to the product of mass and velocity

61
Q

Orifice coefficients are used to determine:

a. ) energy losses
b. ) energy gains
c. ) mass losses
d. ) energy losses and mass gains

A

Energy losses

62
Q

The coefficient of velocity equal to the:

a. ) product of the coefficient of discharge and the coefficient of contraction
b. ) actual velocity divided by the theoretical velocity
c. ) sum of the coefficient of discharge and the coefficient of contraction
d. ) difference of the coefficient discharge and the coefficient of contraction

A

Actual velocity divided by the theoretical velocity

63
Q

When a falling object reaches a speed at which the drag force equals its weight, it has achieved:

a. ) Mach one
b. ) a laminar boundary layer
c. ) a turbulent boundary layer
d. ) terminal velocity

A

A turbulent boundary layer

64
Q

Which of the following is a characteristic of an impulse turbine?

a. ) Steam striking blades on angle
b. ) No steam reaction to velocity
c. ) Steam striking blades at zero angle
d. ) Steam reversing direction

A

Steam striking blades at zero angle

65
Q

The locus of elevations to which water will rise in the piezometer tube is termed:

a. ) energy gradient
b. ) friction head
c. ) hydraulic gradient
d. ) critical path

A

Hydraulic gradient

66
Q

The intake pipe to a hydraulic turbine from a dam is:

a. ) tailrace
b. ) spiral casing
c. ) surge tank
d. ) penstock

A

Penstock

67
Q

In a hydro-electric plant using a Francis turbine with medium head, the speed can be regulated using the

a. ) deflector gate
b. ) nozzle
c. ) wicket gate
d. ) weir

A

Wicket gate

68
Q

What is the pressure at the of draft tube in a turbine?

a. ) below atmospheric
b. ) vacuum
c. ) atmospheric
d. ) gage

A

Atmospheric

69
Q

The locus of elevations to which water will rise in the piezometer tube is termed:

a. ) energy gradient
b. ) friction head
c. ) hydraulic gradient
d. ) critical path

A

Hydraulic gradient

70
Q

The intake pipe to a hydraulic turbine from a dam is:

a. ) tailrace
b. ) spiral casing
c. ) surge tank
d. ) penstock

A

Penstock

71
Q

Which of the following is used as high head turbine?

a. ) Impulse
b. ) Francis
c. ) Reaction
d. ) Propeller

A

Impulse

72
Q

The coefficient of contraction is the ratio of the:

a. ) area of vena contracta to the orifice area
b. ) actual discharge to the theoretical discharge
c. ) actual velocity to the theoretical velocity
d. ) effective head to the actual head

A

Area of vena contracta to the orifice area

73
Q

A type of water turbine where a jet of water is made to fall on the blades or buckets and due to the impulse of water, the turbine starts to move.

a. ) Pelton wheel
b. ) Steam turbine
c. ) Francis turbine
d. ) Reaction turbine

A

Pelton wheel

74
Q

Which of the following is a type of water turbine?

a. ) Parson
b. ) Hero
c. ) Pelton
d. ) Bankl

A

Pelton

75
Q

The combination of enthalpy and kinetic energy of fluid is termed as:

a. ) latent enthalpy
b. ) heat enthalpy
c. ) throttling enthalpy
d. ) stagnation enthalpy

A

Stagnation enthalpy

76
Q

Flow measuring devices include all of the following except:

a. ) flow nozzles
b. ) venture area meters
c. ) pitot tubes
d. ) precision tachometers

A

Precision tachometers

77
Q

Flow measuring devices include all of the following except:

a. ) orifice plate meters
b. ) hot-wire anemometers
c. ) magnetic flow meters
d. ) mercury barometers

A

Mercury barometers

78
Q

The locus of elevation is:

a. ) critical point
b. ) hydraulic gradient
c. ) energy gradient
d. ) friction gradient

A

Hydraulic gradient

79
Q

A Kaplan turbine is:

a. ) a high head mixed flow turbine
b. ) an inward flow impulse turbine
c. ) an outward flow reaction turbine
d. ) low head axial flow turbine

A

Low head axial flow turbine

80
Q

One could expect the possibility of Reynolds number similarity in all of the following cases except:

a. ) submarines
b. ) torpedoes
c. ) seaplane hulls
d. ) supersonic aircraft

A

Seaplane hulls

81
Q

In the absence of any heat and work interactions and any changes in potential energy, the stagnation enthalpy of a fluid remains constant during ___

a. ) unsteady flow
b. ) steady flow
c. ) turbulent flow
d. ) variable flow

A

Steady flow

82
Q

A Francis turbine has what flow?

a. ) Inward flow reaction
b. ) Outward flow impulse
c. ) Outward flow reaction
d. ) Inward flow impulse

A

Inward flow reaction

83
Q

The function of a turbine is to:

a. ) transfer heat from one fluid to another
b. ) increase the total energy content of the flow
c. ) extract energy from the flow
d. ) exchange heat to increase energy to the flow

A

Extract energy from the flow

84
Q

One could expect the possibility of Froude number similarity in all of the following cases except:

a. ) motion of a fluid jet
b. ) flow over spillways
c. ) surge and flood waves
d. ) subsonic airfoils

A

Subsonic airfoils

85
Q

The coefficient of velocity, Cv, accounts for the:

a. ) effects on the flow area of contraction, friction, and turbulence
b. ) small effect of friction and turbulence of the orifice
c. ) changes in diameters of a converging pipe
d. ) effects of cpmpressibility

A

Small effect of friction and turbulence of the orifice

86
Q

The matching of scale model and full-scale results for a fluid dynamic phenomena with a free surface requires equality of:

a.) Reynolds number
b Weber number
c.) Froude number
d.) Cauchy number

A

Froude number

87
Q

The following are all examples of indirect (secondary) miscellaneous methods to measure flow except:

a. ) turbine and propeller meters
b. ) magnetic flow meters
c. ) positive displacement meters
d. ) hot-wire anemometers

A

Positive displacement meters

88
Q

The matching of scale model and full-scale prototype results for a fluid dynamic phenomena involving surface tension requires equality of:

a. ) Reynolds nummber
b. ) Weber number
c. ) Froude number
d. ) Cauchy number

A

Weber number

89
Q

The fact that there is no resistance to bodies moving through an ideal (non-viscous) fluids is known as:

a. ) Reynold’s analogy
b. ) D’ Alembert’s paradox
c. ) Newton’s second law
d. ) the second law of thermodynamics

A

D’ Alembert’s paradox

90
Q

What must be done to change the direction of rotation of a 440-volt, 3-phase induction motor?

a. ) reverse lines to start winding
b. ) interchange any two power leads
c. ) replace any two wires to the rotor
d. ) remove any power leads

A

Interchange any two power leads

91
Q

Flow measuring devices include all of the following except:

a. ) venturi meters
b. ) static pressure probes
c. ) turbine and propeller meters
d. ) magnetic dynamometers

A

Magnetic dynamometers

92
Q

The fact that a fluid’s velocity increases as the cross sectional area of the pipe through which it flow decreases is due to:

a. ) Bernoulli’s equation
b. ) the continuity equation
c. ) the momentum equation
d. ) the perfect gas law

A

The continuity equation

93
Q

The coefficient of velocity is equal to the:

a. ) product of the coefficient of discharge and the coefficient of contraction
b. ) actual velocity divided by the theoretical velocity
c. ) sum of the coefficient of discharge and the coefficient of contraction
d. ) difference of the coefficient of discharge and the coefficient of contraction

A

Actual velocity divided by the theoretical velocity

94
Q

In fluid flow, linear momentum is:

a. ) a vector quantity to the product of mass and velocity
b. ) a scalar quantity equal to the product mass and velocity
c. ) a scalar quantity to the product of force and length of time is applied
d. ) the change in impulse

A

A vector quantity equal to the product of mass and velocity

95
Q

The following are examples of indirect (secondary) measurements to measure flow rates using obstruction meters except:

a. ) variable area meters
b. ) venture meters
c. ) volume tanks
d. ) flow nozzles

A

Volume tanks

96
Q

All of the following fluid phenomena are based on the force momentum principle of a flowing fluid except:

a. ) turbines
b. ) Pelton wheels
c. ) Diesel automobile engines
d. ) jet engines

A

Diesel automobiles engines

97
Q

The locus of elevation is:

a. ) critical point
b. ) hydraulic gradient
c. ) energy gradient
d. ) friction gradient

A

Hydraulic gradient

98
Q

A Francis turbine has what flow?

a. ) Inward flow reaction
b. ) Outward flow impulse
c. ) Outward flow reaction
d. ) Inward flow impulse

A

Inward flow reaction

99
Q

The coefficient of contraction is the ratio of the:

a. ) area of vena contracta to the orifice area
b. ) actual discharge to the theoretical discharge
c. ) actual velocity to the theoretical velocity
d. ) effective head to the actual head

A

Area of vena contracta to the orifice area

100
Q

In pumped storage plant

a. ) power is produced by pumps
b. ) water is stored by pumping to high pressures
c. ) pressure accumulators are used
d. ) downstream water is pumped upstream during offload perios

A

Downstream water is pumped upstream during offload periods