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Hydraulic Turbines Quiz 4A

Total questions: 120

Worksheet time: 2hrs 0mins

Name
Class
Date
1.

1. Hydraulic energy is converted into another form of energy by hydraulic machines. What form of energy is that?

a)

Mechanical Energy

b)

Electrical Energy

c)

Nuclear Energy

d)

Elastic Energy

2.

2. In hydraulic turbines, inlet energy is greater than the outlet energy.

a)

True

b)

False

3.

3. Which principle is used in Hydraulic Turbines?

a)

Faraday law

b)

Newton’s second law

c)

Charles law

d)

Braggs law

4.

4. Buckets and blades used in a turbine are used to:

a)

Alter the direction of water

b)

Switch off the turbine

c)

To regulate the wind speed

d)

To regenerate the power

5.

5. _______________is the electric power obtained from the energy of the water.

a)

Roto dynamic power

b)

Thermal power

c)

Nuclear power

d)

Hydroelectric power

6.

6. Which energy generated in a turbine is used to run electric power generator linked to the turbine shaft?

a)

Mechanical Energy

b)

Potential Energy

c)

Elastic Energy

d)

Kinetic Energy

7.

7. Which kind of turbines changes the pressure of the water entered through it?

a)

Reaction turbines

b)

Impulse turbines

c)

Reactive turbines

d)

Kinetic turbines

8.

8. Which type of turbine is used to change the velocity of the water through its flow?

a)

Kinetic turbines

b)

Axial flow turbines

c)

Impulse turbines

d)

Reaction turbines

9.

9. Which type of turbine is a Francis Turbine?

a)

Impulse Turbine

b)

Screw Turbine

c)

Reaction turbine

d)

Turgo turbine

10.

10. Turgo Turbine is an impulsive turbine.

a)

True

b)

False

11.

11. Which kind of turbine is a Fourneyron Turbine?

a)

Inward flow turbine

b)

Outward flow turbine

c)

Mixed flow turbine

d)

Radial flow turbine

12.

12. Maximum Number of jets, generally, employed in an vertical shaft impulse turbine without jet interference can be?

a)

2

b)

3

c)

4

d)

6

13.

13. The overall efficiency of a reaction turbine is the ratio of

a)

Actual work available at the turbine to the energy imparted to the wheel

b)

Work done on the wheel to the energy (or head of water) actually supplied to the turbine

c)

Power produced by the turbine to the energy actually supplied by the turbine

d)

Actual work available at the turbine to energy imparted to the wheel

14.

14. In a reaction turbine, the draft tube is used to ________

a)

To increase the head of water by an amount that is equal to the height of the runner outlet above the tail race

b)

To prevent air to enter the turbine

c)

To increase pressure energy of water

d)

To transport water to downstream

15.

15. In reaction turbine hydraulic efficiency is_________

a)

Ratio of actual work at the turbine to the energy imparted to the wheel

b)

Ratio of work done on the wheel to energy that is supplied to the turbine

c)

Ratio of power produced by the turbine to the energy actually supplied by the turbine

d)

Ratio of Work done on the wheel to the energy (or head of water) actually supplied to the turbine

16.

16. Consider an inward flow reaction turbine, here, water _______

a)

Flows parallel to the axis of the wheel

b)

Enters the wheel at the outer periphery and then flows towards the centre of the wheel

c)

Flow is partly radial and partly axial

d)

Enters at the centre of the wheel and then flows towards the outer periphery of the wheel

17.

17. Which kind of turbine is a Pelton Wheel turbine?

a)

Tangential flow turbine

b)

Radial flow turbine

c)

Outward flow turbine

d)

Inward flow turbine

18.

18. In what type of turbine water enters in radial direction and leaves axial direction?

a)

Tangential flow turbine

b)

Axial flow turbine

c)

Outward flow turbine

d)

Mixed flow turbine

19.

19. How many types of turbines can you classify on the basis of direction of flow through runner?

a)

6

b)

3

c)

4

d)

7

20.

20. Into how many types can you classify radial flow turbines?

a)

4

b)

3

c)

6

d)

2

21.

21. Into how many types can you classify turbines on basis of head at inlet?

a)

3

b)

4

c)

6

d)

5

22.

22. Among the following which turbine requires more head?

a)

Pelton Turbine

b)

Kaplan Turbine

c)

Francis turbine

d)

Tube Turbine

23.

23. Head under which Kaplan turbine is operated_____

a)

10-60 meters

b)

60 -100 meters

c)

100-200 meters

d)

Above 200 meters

24.

24. Head under which Francis turbine is operated?

a)

10-70 meters

b)

10-100 meters

c)

100-700 meters

d)

60-250 meters

25.

25. The turbine preferred for 0 to 25 m head of water is?

a)

Pelton wheel

b)

Kaplan turbine

c)

Tube turbine

d)

Francis turbine

26.

26. Under what head is Pelton turbine operated?

a)

20-50 meters

b)

15-2000 meters

c)

60-200 meters

d)

50-500 meters

27.

27. ____________ is difference between head race and tail race.

a)

Gross head

b)

Net head

c)

Net positive suction head

d)

Manometric head

28.

28. The head available at inlet of turbine is ___________

a)

Net positive suction head

b)

Gross head

c)

Net head

d)

Manometric head

29.

29. The difference between gross head and friction losses is __________

a)

Net head

b)

Gross head

c)

Manometric head

d)

Net positive suction head

30.

30. ___________ is defined as ratio between power delivered to runner and power supplied at inlet of turbine.

a)

Mechanical efficiency

b)

Volumetric efficiency

c)

Hydraulic efficiency

d)

Overall efficiency

31.

31. Which among the following is not an efficiency of turbine?

a)

Mechanical efficiency

b)

Volumetric efficiency

c)

Hydraulic efficiency

d)

Electrical efficiency

32.

32. The ratio of power at the shaft of turbine and power delivered by water to runner is known as?

a)

Mechanical efficiency

b)

Volumetric efficiency

c)

Hydraulic efficiency

d)

Overall efficiency

33.

33. The product of mechanical efficiency and hydraulic efficiency is known as?

a)

Mechanical efficiency

b)

Volumetric efficiency

c)

Hydraulic efficiency

d)

Overall efficiency

34.

34. Among the following which turbine has highest efficiency?

a)

Kaplan turbine

b)

Francis turbine

c)

Pelton turbine

d)

Propeller turbine

35.

35. __________ is ratio of volume of water actually striking the runner and volume of water supplied to turbine.

a)

Mechanical efficiency

b)

Volumetric efficiency

c)

Hydraulic efficiency

d)

Overall efficiency

36.

36. In the expression for overall efficiency of turbine, which is P/(k*g*Q*H), where “k” is known as __________

a)

Density of liquid

b)

Specific density of liquid

c)

Volume of liquid

d)

Specific gravity of liquid

37.

37. The expression for maximum hydraulic efficiency of Pelton turbine is given by?

a)

(1+cos k)/2 where k is outlet blade angle

b)

(2+cos k)/2 where k is outlet blade angle

c)

(3+cos k)/2 where k is outlet blade angle

d)

(4+cos k)/2 where k is outlet blade angle

38.

38. To obtain maximum hydraulic efficiency of Pelton turbine, blade velocity should be ___________ Times the inlet velocity of jet.

a)

Half

b)

One quarter

c)

Twice

d)

Thrice

39.

39. Among the following which turbine has least efficiency?

a)

Pelton turbine

b)

Kaplan turbine

c)

Francis turbine

d)

Propeller turbine

40.

40. The ratio of volume available at shaft of turbine and power supplied at the inlet of the turbine

a)

Mechanical efficiency

b)

Volumetric efficiency

c)

Hydraulic efficiency

d)

Overall efficiency

41.

41. The electric power which is obtained from hydraulic energy___________

a)

Thermal power

b)

Mechanical power

c)

Solar power

d)

Hydroelectric power

42.

42. At present which is cheapest means of generating power___________

a)

Thermal power

b)

Nuclear power

c)

Hydroelectric power

d)

Electric Power

43.

43. Pipes of largest diameter which carry water from reservoir to the turbines is known as____________

a)

Head stock

b)

Tail race

c)

Tail stock

d)

Pen stock

44.

44. Pen stocks are made up of _____________

a)

Steel

b)

Cast iron

c)

Mild steel

d)

Wrought iron

45.

45. ___________ is an inward radial flow reaction turbine.

a)

Pelton turbine

b)

Kaplan turbine

c)

Francis turbine

d)

Propeller turbine

46.

46. The important type of axial flow reaction turbines are ____________

a)

Propeller and Pelton turbines

b)

Kaplan and Francis turbines

c)

Propeller and Francis turbines

d)

Propeller and Kaplan turbines

47.

47. ___________ is a axial flow reaction turbines, if vanes are fixed to hub of turbine.

a)

Propeller turbine

b)

Francis turbine

c)

Kaplan turbine

d)

Pelton turbine

48.

48. Francis and Kaplan turbines are known as _______

a)

Impulse turbines

b)

Reaction turbines

c)

Axial flow turbines

d)

Mixed flow turbines

49.

49. Specific speed of reaction turbine is between?

a)

5 and 50

b)

10 and 100

c)

100 and 150

d)

150 and 300

50.

50. Impulse turbine is generally fitted ____________

a)

At the level of tail race

b)

Above the tail race

c)

Below the tail race

d)

About 2.5mts above tail race to avoid cavitations.

51.

51. Hydraulic turbines are classified based on _________

a)

Energy available at inlet of turbine

b)

Direction of flow through vanes

c)

Head at inlet of turbine

d)

Energy available, Direction of flow, Head at inlet

52.

52. Impulse turbine and reaction turbine are classified based on?

a)

Type of energy at inlet

b)

Direction of flow through runner

c)

Head at inlet of turbine

d)

Specific speed of turbine

53.

53. Tangential flow, axial flow, radial flow turbines are classified based on?

a)

Type of energy at inlet

b)

Direction of flow through runner

c)

Head at inlet of turbine

d)

Specific speed of turbine

54.

54. High head, low head and medium head turbines are classified based on ___________

a)

Type of energy at inlet

b)

head of flow through runner

c)

Head at inlet of turbine

d)

head at upstream and Specific speed of turbine

55.

55. If energy available at inlet of turbine is only kinetic energy then it is classified based on __________

a)

Type of energy at inlet

b)

Direction of flow through runner

c)

Head at inlet of turbine

d)

Specific speed of turbine

56.

56. If water flows in radial direction at inlet of runner and leaves axially at outlet then turbine is named as ________

a)

Tangential flow turbine

b)

Axial flow turbine

c)

Radial flow turbine

d)

Mixed flow turbine

57.

57. Pelton turbine is operated under________

a)

Low head and high discharge

b)

High head and low discharge

c)

Medium head and high discharge

d)

Medium head and medium discharge

58.

58. Kaplan turbine is operated under _________

a)

Low head and high discharge

b)

High head and low discharge

c)

Medium head and high discharge

d)

Medium head and medium discharge

59.

59. Medium specific speed of turbine implies _____________

a)

Pelton turbine

b)

Kaplan turbine

c)

Francis turbine

d)

Propeller turbine

60.

60. High specific speed of turbine implies that it is __________

a)

Francis turbine

b)

Propeller turbine

c)

Pelton turbine

d)

Kaplan turbine

61.

61. Velocity triangles are used to analyze ___________

a)

Flow of water along blades of turbine

b)

Measure discharge of flow

c)

Angle of deflection of jet

d)

Flow of water, measure of discharge, angle of deflection

62.

62. In which of following turbine inlet and outlet velocities of vanes are equal?

a)

Francis turbine

b)

Kaplan turbine

c)

Pelton turbine

d)

Propeller turbine

63.

63. Tangential velocity of blade of Pelton wheel is proportional to ___________

a)

Speed of wheel

b)

Angular velocity of wheel

c)

Rpm of wheel

d)

Speed, angular velocity, RPM of the wheel

64.

64. The value of coefficient of velocity is ____________

a)

0.98

b)

0.65

c)

0.85

d)

0.33

65.

65. In which of following turbine inlet whirl velocity and inlet jet velocity are equal in magnitude?

a)

Pelton turbine

b)

Propeller turbine

c)

Kaplan turbine

d)

Francis turbine

66.

66. In Pelton wheel, if outlet velocity angle of jet is “acute angled” then outlet whirl velocity of jet is ____________

a)

x- component of Vr1 – blade velocity

b)

x- component of V r1 + blade velocity

c)

Blade velocity – x- component of V r1

d)

Zero

67.

67. In Pelton wheel, if outlet velocity angle of jet is “obtuse angled” then outlet whirl velocity of jet is ___________

a)

x- component of V r1 – blade velocity

b)

x- component of V r1 + blade velocity

c)

Blade velocity – x- component of V r1

d)

Zero

68.

68. In Pelton wheel, if outlet velocity angle of jet is “right angled” then outlet whirl velocity of jet is __________

a)

x- component of V r1 – blade velocity

b)

x- component of V r1 + blade velocity

c)

Blade velocity – x- component of V r1

d)

Zero

69.

69. In Pelton wheel, relative inlet velocity of jet with respect to velocity of vane is _____________

a)

Difference between inlet jet velocity and blade velocity

b)

Sum of inlet jet velocity and blade velocity

c)

Inlet jet velocity

d)

Blade velocity

70.

70. In Pelton wheel if angle of deflection is not mentioned then we assume it as______________

a)

150 degrees

b)

200 degrees

c)

165 degrees

d)

185 degrees

71.

71. The work done per unit weight of water jet striking runner blades of Pelton turbine is given by expression ______________

a)

[Vw+Vw1] u/g

b)

Vw*u/g

c)

[Vw+Vw1]/g

d)

[Vw+Vw1]u

72.

72. In Pelton turbine the energy available at inlet of runner that is at outlet of nozzle is known as

a)

Shaft power

b)

Runner power

c)

Output power

d)

Water power

73.

73. In Pelton turbines the expression for power delivered at inlet to runner is given by __________

a)

W*[Vw+Vw1]u/g

b)

W*[Vw-Vw1]u/g

c)

W*[Vw+Vw1]u/g, W*[Vw-Vw1]u/g

d)

[Vw+Vw1]u/g

74.

74. In Pelton turbine runner power is more when compared with power available at exit of nozzle.

a)

True

b)

False

75.

75. Kinetic energy of jet at inlet of turbine is given as _____

a)

0.5(paV)*V

b)

0.5(paV)*V*V

c)

0.5(aV1)*V*V

d)

0.5(pV1)*V*V

76.

76. The force exerted by a jet of water in the direction of jet of jet on a stationary curved plates Fx is _____

a)

pav*v

b)

pav

c)

pav*v(1+cos k)

d)

pav*v(1+sin k)

77.

77. The force exerted by a jet of water in the direction of jet of jet on moving curved plates is ___________

a)

pa(v-u)*(v-u)

b)

pa(v-u)

c)

pav*(v-u)(1+cos k)

d)

pa(v-u)*(v-u)(1+sin k)

78.

78. Calculate work done by jet per second on the runner where, discharge=0.7cubic meters/s, inlet and outlet whirl velocities be 23.77 and 2.94?

a)

200Kw

b)

150Kw

c)

187Kw

d)

250Kw

79.

79. The power supplied at inlet of turbine in S.I units is known as_____________

a)

Shaft power

b)

Runner power

c)

Water power

d)

Total power

80.

80. The expression for water power in Pelton wheel is ________________

a)

(P*g*Q*H) Kw

b)

(g*Q*H*a) Kw

c)

(g*Q) Kw

d)

(g*H) Kw

81.

81. The hydraulic efficiency of Pelton turbine will be maximum when blade velocity is equal to ______

a)

V/2

b)

V/3

c)

V/4

d)

V/5

82.

82. In Pelton turbine ___________ is defined as ratio between power delivered to runner and power supplied at inlet of turbine.

a)

Mechanical efficiency

b)

Volumetric efficiency

c)

Hydraulic efficiency

d)

Overall efficiency

83.

83. In Pelton turbine product of mechanical efficiency and hydraulic efficiency is known as _____________

a)

Mechanical efficiency

b)

Volumetric efficiency

c)

Hydraulic efficiency

d)

Overall efficiency

84.

84. Among the following which turbine has least efficiency?

a)

Pelton turbine

b)

Pelton turbine

c)

Francis turbine

d)

Propeller turbine

85.

85. In Pelton ____________ is ratio of volume of water actually striking the runner and volume of water supplied to turbine

a)

Mechanical efficiency

b)

Volumetric efficiency

c)

Hydraulic efficiency

d)

Overall efficiency

86.

86. In Pelton turbine the ratio of volume available at shaft of turbine and power supplied at the inlet of the turbine is _______

a)

Mechanical efficiency

b)

Volumetric efficiency

c)

Hydraulic efficiency

d)

Overall efficiency

87.

87. The expression for maximum hydraulic efficiency of Pelto turbine is given by ______________

a)

(1+cos k)/2 where k is outlet blade angle

b)

(2+cos k)/2 where k is outlet blade angle

c)

(3+cos k)/2 where k is outlet blade angle

d)

(4+cos k)/2 where k is outlet blade angle

88.

88. In the expression for overall efficiency of turbine, which is p/ (k*g*q*h), where “k” is known as ______

a)

Specific density of liquid

b)

Density of liquid

c)

Specific gravity of liquid

d)

Volume of liquid

89.

89. In Pelton turbine hydraulic efficiency is product of mechanical efficiency and overall efficiency.

a)

True

b)

False

90.

90. In Pelton turbine inlet velocity of jet is 85.83m/s, inlet and outlet whirl velocities be 85.83 and 0.143 and blade velocity be 38.62 then its hydraulic efficiency is ___________

a)

90.14%

b)

80%

c)

70%

d)

85%

91.

91. Design of Pelton wheel means the following data is to be determined.

a)

Width of buckets

b)

Depth of buckets

c)

Number of buckets

d)

All of the mentioned

92.

92. The width of buckets of Pelton wheel is _________________

a)

2 times diameter of jet

b)

3 times diameter of jet

c)

4 times diameter of jet

d)

5 times diameter of jet

93.

93. The depth of buckets of Pelton wheel ____________

a)

1.2 times diameter of jet

b)

1.3 times diameter of jet

c)

1.4 times diameter of jet

d)

1.5 times diameter of jet

94.

94. The ratio of pitch diameter of Pelton wheel to diameter of jet is known as ___________

a)

Speed ratio

b)

Jet ratio

c)

Velocity ratio

d)

Co-efficient of velocity

95.

95. Find the diameter of jet D, if jet ratio m and diameter of jet d are given as 10 and 125mm.

a)

1.25 meters

b)

1.5 meters

c)

2 meters

d)

1.2 meters

96.

96. The number of buckets of Pelton wheel is 25 and diameter of runner is 1.5meters then calculate diameter of jet is ___________

a)

80 mm

b)

85 mm

c)

90 mm

d)

82 mm

97.

97. In most of cases the value of jet ratio is ______

a)

10

b)

7

c)

12

d)

18

98.

98. Number of buckets on runner of Pelton wheel is given by expression? (D-diameter of runner and d- diameter of jet)

a)

15 + D/2d

b)

15 + 3D/2d

c)

15 + D/d

d)

15 + 2D/d

99.

99. ____________ is obtained by dividing total rate of flow through the turbine by rate of flow through single jet.

a)

Number of jets

b)

Diameter of jets

c)

Velocity of jets

d)

Speed ratio

100.

100. If diameter of jet is 85mm and diameter of runner is 1.5 meter then calculate width of buckets.

a)

400mm

b)

500mm

c)

420mm

d)

425mm

101.

101. If diameter of jet is 85mm and diameter of runner is 1.5 meter then depth of buckets is _________

a)

100mm

b)

105mm

c)

106mm

d)

102mm

102.

102. If diameter of jet is 85mm and diameter of runner is 1.5 meter then calculate number of buckets on Pelton wheel approximately

a)

20

b)

22

c)

23

d)

25

103.

103. The width of Pelton wheel should be 5 times the diameter of jet?

a)

Ture

b)

False

104.

104. Radial flow reaction turbines are those turbines in which water flows in _______

a)

Radial direction

b)

Axial direction

c)

Tangential direction

d)

All of the mentioned

105.

105. Main parts of radial flow reaction turbines are ______________

a)

Casing

b)

Guide mechanism

c)

Draft tube

d)

All of the mentioned

106.

106. Radial flow reaction turbines contain spiral casing which area ____________

a)

Remains constant

b)

Gradually decreases

c)

Gradually increases

d)

Suddenly decreases

107.

107. ____________ consists of stationary circular wheel all around the runner of turbine

a)

Casing

b)

Guide mechanism

c)

Runner

d)

Drafting

108.

108. The casing of radial flow reaction turbine is made of spiral shape, so that water may enter the runner__________

a)

Variable acceleration

b)

Constant acceleration

c)

Variable velocity

d)

Constant velocity

109.

109. _____________ allow the water to strike the vanes fixed on runner without shock at inlet

a)

Casing

b)

Guide vanes

c)

Runner

d)

Draft tube

110.

110. Runner blades are made up of _____________

a)

Cast steel

b)

Cast iron

c)

Wrought iron

d)

Steel

111.

111. The pressure at the exit of runner of reaction turbine is generally____________than atmospheric pressure

a)

Greater

b)

Lesser

c)

Constant

d)

Equal

112.

112. ___________is a pipe of gradually increasing area used for discharging water from exit of the turbine to the tail race.

a)

Casing

b)

Guide mechanism

c)

Draft tube

d)

Runner

113.

113. ____________and __________of radial flow reaction turbine are always full of water.

a)

Casing and runner

b)

Casing and penstocks

c)

Runner and penstocks

d)

Runner and draft tube

114.

114. ____________governs the flow of water entering the runner blades.

a)

Casing

b)

Guide vanes

c)

Draft tube

d)

Runner

115.

115. Spiral casing of reaction turbine will regulate the flow.

a)

True

b)

False

116.

116. Inward radial flow reaction turbine is a turbine in which water flows across the blades of runner______________

a)

Radial direction

b)

Radially inward

c)

Radially outward

d)

Axial direction

117.

117. Which of following is inward radial flow reaction turbine?

a)

Pelton wheel

b)

Francis turbine

c)

Axial turbine

d)

Kaplan turbine

118.

118. In Inward radial flow reaction turbine which is not required?

a)

Runner

b)

Air tight casing

c)

Guide vanes

d)

Breaking jet

119.

119. In Inward radial flow reaction turbine the ratio of flow velocity at inlet to given velocity of jet is known as _______

a)

Speed ratio

b)

Flow ratio

c)

Discharge

d)

Radial discharge

120.

120. In Inward radial flow reaction turbine the ratio of tangential velocity at inlet to the absolute velocity ____________

a)

Speed ratio

b)

Flow ratio

c)

Discharge

d)

Radial discharge

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