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CHAP 9 - Hydroelectric Plant

Total questions: 100

Worksheet time: 50mins

Name
Class
Date
1.

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

a)

air pump

b)

air ejector

c)

air injector

d)

air jet

2.

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 these

3.

PAST BOARD QUESTION What is the type of turbine that has specific speed below 55 ?

a)

Impulse turbine

b)

Francis turbine

c)

Propeller turbine

d)

Deriaz turbine

4.

PAST BOARD QUESTION Which of the following is a high discharge type of turbine?

a)

Impulse turbine

b)

Propeller turbine

c)

Francis turbine

d)

Deriaz turbine

5.

PAST BOARD QUESTION Which of the following is used to minimize the speed rise due to a sudden load rejection.

a)

needle valve

b)

wicket gate

c)

Shut-off valve

d)

jet deflector

6.

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

a)

1010 diameters downstream of the hole

b)

at jet's minimum diameter

c)

at the orifice minimum diameter

d)

at the orifice maximum diameter

7.

PAST BOARD QUESTION It is the speed of a turbine when the head on the turbine is one meter.

a)

Specific speed

b)

Utilized speed

c)

Rated speed

d)

Unit Speed

8.

PAST BOARD QUESTION Which of the following turbines has a diagonal flow?

a)

Impulse turbine

b)

Propeller turbine

c)

Francis turbine

d)

Deriaz turbine

9.

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)

turbulent flow

c)

steady flow

d)

variable flow

10.

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

11.

PAST BOARD QUESTION A temporary structures constructed to exclude water from the site of the foundation during its excavation and construction is called _____

a)

caisson

b)

coffer dam

c)

retaining wall

d)

buttress dam

12.

PAST BOARD QUESTION Which dam is best for weak foundation?

a)

gravity

b)

buttress

c)

arch

d)

earth

13.

PAST BOARD QUESTION What type of turbine that has a degree of reaction of 1/21/2 ?

a)

Impulse turbine

b)

Rarsons turbine

c)

Reaction turbine

d)

Deriaz turbine

14.

PAST BOARD QUESTION This graph shows the variation of river flow (discharge) with time.

a)

Hydrograph

b)

Mass curve

c)

Hyctograph

d)

Flow duration curve

15.

PAST BOARD QUESTION What do you call an open channel erected on a surface above the ground?

a)

Canal

b)

Penstock

c)

Tunnel

d)

Flume

16.

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

17.

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

18.

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

19.

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

20.

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

21.

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

22.

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

23.

The coefficient of velocity, CvC_v , 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 compressibility

24.

PAST BOARD QUESTION Which of the following is the type of turbine used up to 300 m300\,\text{m} head?

a)

Impulse turbine

b)

Pelton wheel turbine

c)

Francis turbine

d)

Deriaz turbine

25.

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

26.

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

27.

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

28.

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

29.

Pitot tube is used to measure the _____

a)

velocity of mass

b)

velocity of pipe

c)

flow

d)

velocity of flow

30.

Orifice coefficients are used to determine what?

a)

energy losses

b)

energy gains

c)

mass losses

d)

energy losses and mass gains

31.

The coefficient of velocity is the ratio of the:

a)

area of vena contracta to the orifice area

b)

actual discharge to the theoretical discharge

c)

actual discharge velocity to the theoretical discharge velocity

d)

effective head to the actual head

32.

The volume flow passes through a venturimeter is _____

a)

increasing

b)

decreasing

c)

constant

d)

varying

33.

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

34.

PAST BOARD QUESTION In the hydro - electric plant having a medium head and using a Francis turbine, the turbine speed may be regulated through:

a)

deflector gate

b)

nozzle

c)

wicket gate

d)

forebay

35.

PAST BOARD QUESTION A Francis turbine has what flow?

a)

Inward flow reaction

b)

Outward flow impulse

36.

Which of the following is a type of water turbine?

a)

Parson

b)

Hero

c)

Pelton

d)

Banki

37.

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

38.

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

39.

The locus of elevation is _____.

a)

critical point

b)

hydraulic gradient

c)

energy gradient

d)

friction gradient

40.

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

41.

The intake pipe to a hydraulic turbine from a dam is _____.

a)

tailrace

b)

spiral casing

c)

surge tank

d)

penstock

42.

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

43.

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

44.

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

45.

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

46.

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

47.

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

a)

Below atmospheric

b)

Vacuum

c)

Atmospheric

d)

Gage

48.

An impulse turbine are used for:

a)

low head

b)

medium head

c)

high head

d)

very low head

49.

Which of the following is used as high head turbine?

a)

Impulse

b)

Francis

c)

Reaction

d)

Propeller

50.

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 periods

51.

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

a)

Below atmospheric

b)

Vacuum

c)

Atmospheric

d)

Gage

52.

An impulse turbine has _____.

a)

low head

b)

medium head

c)

high head

d)

very low head

53.

High head turbine is a/an _____.

a)

Impulse

b)

Francis

c)

Reaction

d)

Propeller

54.

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

55.

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

56.

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

a)

suction lift

b)

drawdown

c)

priming level

d)

clogging

57.

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

58.

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

59.

The intake pipe to a hydraulic turbine from a dam is _____.

a)

tailrace

b)

spiral casing

c)

surge tank

d)

penstock

60.

In the hydro-electric plant having a medium head and using a Francis turbine, the turbine speed may be regulated through:

a)

deflector gate

b)

nozzle

c)

wicket gate

d)

forebay

61.

A Francis turbine has what flow?

a)

Inward flow reaction

b)

Outward flow impulse

c)

Outward flow reaction

d)

Inward flow impulse

62.

Which of the following is a type of water turbine?

a)

Parson

b)

Hero

c)

Pelton

d)

Banki

63.

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

64.

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

65.

The locus of elevation is _____.

a)

critical point

b)

hydraulic gradient

c)

energy gradient

d)

friction gradient

66.

How do you call the locus of elevations to which water will rise in the piezometer tube?

a)

energy gradient

b)

friction head

c)

hydraulic gradient

d)

critical path

67.

In turbine installation, the air is removed from the condenser by _____.

a)

air pump

b)

air injector

c)

air ejector

d)

air jet

68.

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 these

69.

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

70.

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

71.

Flow measuring devices include all of the following except

a)

flow nozzles

b)

venturi area meters

c)

pitot tubes

d)

precision tachometers

72.

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

a)

variable area meters

b)

venturi meters

c)

volume tanks

d)

flow nozzles

73.

The following are examples of 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

74.

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

75.

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

76.

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

a)

latent enthalpy

b)

heat enthalpy

c)

throttling enthalpy

d)

stagnation enthalpy

77.

The coefficient of velocity, CvC_v , 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 compressibility

78.

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

79.

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

80.

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

81.

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

a)

Reynolds number

b)

Weber number

c)

Froude number

d)

Cauchy number

82.

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 number

83.

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

84.

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

85.

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

a)

fluid density

b)

fluid velocity

c)

units of measure (SI or English Engineering System)

d)

drag force

86.

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

87.

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

88.

Pitot tube is used to measure the

a)

velocity of mass

b)

flow

c)

velocity of pipe

d)

velocity of flow

89.

Orifice coefficients are used to determine

a)

energy losses

b)

energy gains

c)

mass losses

d)

energy losses and mass gains

90.

The coefficient of velocity is the ratio of the

a)

area of vena contracta to the orifice area

b)

actual discharge to the theoretical discharge

c)

actual discharge velocity to the theoretical discharge velocity

d)

effective head to the actual head

91.

The volume flow passes through a venturimeter is

a)

increasing

b)

constant

c)

decreasing

d)

varying

92.

A Pelton wheel is an _____ impulse turbine.

a)

axial flow

b)

outward flow

c)

inward flow

d)

mixed flow

93.

The hydraulic efficiency of an impulse turbine is the

a)

ratio of actual power produced by the turbine to the energy actually supplied to the turbine

b)

ratio of actual work available at the turbine to the energy imparted to the wheel

c)

ratio of the work done on the wheel to the energy of the jet

d)

none of these

94.

The hydraulic efficiency of an impulse turbine is maximum when the velocity of wheel is _____ of the jet velocity.

a)

one-half

b)

double

c)

one-fourth

d)

three-fourth

95.

The width of the bucket for a Pelton wheel is generally how many times the diameter of the jet?

a)

twice

b)

four times

c)

thrice

d)

five times

96.

In a Francis turbine runner, the number of blades are generally between

a)

2 to 4

b)

8 to 16

c)

4 to 8

d)

16 to 24

97.

The maximum number of jets generally employed in an impulse turbine without interference are

a)

Two

b)

six

c)

four

d)

eight

98.

Which of the following is not a reaction turbine?

a)

Jonval turbine

b)

Furneyron turbine

c)

Kaplan turbine

d)

Pelton wheel turbine

99.

Which of the following turbine is different from the others?

a)

Pelton wheel

b)

Jonval turbine

c)

Banki turbine

d)

Kaplan turbine

100.

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.equal to the product of force and length of time is applied

d)

the change in impulse

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