McqMate
Chapters
| 51. |
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 |
| Answer» B. Enters the wheel at the outer periphery and then flows towards the centre of the wheel | |
| 52. |
The working of which of the following hydraulic units is based on Pascal’s law? |
| A. | Air lift pump |
| B. | Hydraulic coupling |
| C. | Hydraulic press |
| D. | Jet pump |
| Answer» C. Hydraulic press | |
| 53. |
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 |
| Answer» A. Tangential flow turbine. | |
| 54. |
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 |
| Answer» D. Mixed flow turbine | |
| 55. |
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 |
| Answer» C. 4 | |
| 56. |
Into how many types can you classify radial flow turbines? |
| A. | 4 |
| B. | 3 |
| C. | 6 |
| D. | 2 |
| Answer» D. 2 | |
| 57. |
Into how many types can you classify turbines on basis of head at inlet? |
| A. | 3 |
| B. | 4 |
| C. | 6 |
| D. | 5 |
| Answer» A. 3 | |
| 58. |
Among the following which turbine requires more head? |
| A. | Pelton Turbine |
| B. | Kaplan Turbine |
| C. | Francis turbine |
| D. | Tube Turbine |
| Answer» A. Pelton Turbine | |
| 59. |
Total head of turbines is_ |
| A. | Pressure head + Static head |
| B. | Kinetic head + Static head |
| C. | Static head + Pressure head |
| D. | Pressure head + Kinetic head + Static head |
| Answer» D. Pressure head + Kinetic head + Static head | |
| 60. |
Head under which Kaplan turbine is operated |
| A. | 10-70 meters |
| B. | 70 -100 meters |
| C. | 100-200 meters |
| D. | Above 200 meters |
| Answer» A. 10-70 meters | |
| 61. |
Head under which Francis turbine is operated |
| A. | 10-70 meters |
| B. | 70-100 meters |
| C. | 100-200 meters |
| D. | 40 -600 meters |
| Answer» D. 40 -600 meters | |
| 62. |
The turbine is preferred for 0 to 25 m head of water? |
| A. | Pelton wheel |
| B. | Kaplan turbine |
| C. | Tube turbine |
| D. | Francis turbine |
| Answer» B. Kaplan turbine | |
| 63. |
Under what head is Pelton turbine operated? |
| A. | 20-50 meters |
| B. | 15-2000 meters |
| C. | 60-200 meters |
| D. | 50-500 meters |
| Answer» B. 15-2000 meters | |
| 64. |
is difference between head race and tail race |
| A. | Gross head |
| B. | Net head |
| C. | Net positive suction head |
| D. | Manometric head |
| Answer» A. Gross head | |
| 65. |
The head available at inlet of turbine |
| A. | Net positive suction head |
| B. | Gross head |
| C. | Net head |
| D. | Manometric head |
| Answer» C. Net head | |
| 66. |
Head lost due to friction is given by k*f*L*v*v/D*2g where f- friction coefficient, L- length of pen stock, D- diameter of penstock and” k” is constant and its value is |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 67. |
The difference between gross head and friction losses is |
| A. | Net head |
| B. | Gross head |
| C. | Manometric head |
| D. | Net positive suction head |
| Answer» A. Net head | |
| 68. |
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 |
| Answer» C. Hydraulic efficiency | |
| 69. |
Which among the following which is not an efficiency of turbine? |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Electrical efficiency |
| Answer» D. Electrical efficiency | |
| 70. |
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 |
| Answer» A. Mechanical efficiency | |
| 71. |
The product of mechanical efficiency and hydraulic efficiency is known as? |
| A. | Mechanical efficiency |
| B. | Volumetric efficiency |
| C. | Hydraulic efficiency |
| D. | Overall efficiency |
| Answer» D. Overall efficiency | |
| 72. |
Among the following which turbine has highest efficiency? |
| A. | Kaplan turbine |
| B. | Francis turbine |
| C. | Pelton turbine |
| D. | Propeller turbine |
| Answer» A. Kaplan turbine | |
| 73. |
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 |
| Answer» A. Density of liquid | |
| 74. |
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 |
| Answer» A. (1+cos k)/2 where k is outlet blade angle | |
| 75. |
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 |
| Answer» A. Half | |
| 76. |
Among the following which turbine has least efficiency? |
| A. | Pelton turbine |
| B. | Kaplan turbine |
| C. | Francis turbine |
| D. | Propeller turbine |
| Answer» A. Pelton turbine | |
| 77. |
A hydraulic coupling belongs to the category of |
| A. | Energy absorbing machines |
| B. | Energy generating machines |
| C. | Power absorbing machines |
| D. | Energy transfer machines |
| Answer» D. Energy transfer machines | |
| 78. |
The electric power which is obtained from hydraulic energy |
| A. | Thermal power |
| B. | Mechanical power |
| C. | Solar power |
| D. | Hydroelectric power |
| Answer» D. Hydroelectric power | |
| 79. |
At present which is cheapest means of generating power_ |
| A. | Thermal power |
| B. | Nuclear power |
| C. | Hydroelectric power |
| D. | Electric Power |
| Answer» C. Hydroelectric power | |
| 80. |
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 |
| Answer» D. Pen stock | |
| 81. |
Pen stocks are made up of |
| A. | Steel |
| B. | Cast iron |
| C. | Mild steel |
| D. | Wrought iron |
| Answer» A. Steel | |
| 82. |
is an inward radial flow reaction turbine? |
| A. | Pelton turbine |
| B. | Kaplan turbine |
| C. | Francis turbine |
| D. | Propeller turbine |
| Answer» C. Francis turbine | |
| 83. |
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 |
| Answer» D. Propeller and Kaplan turbines | |
| 84. |
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 |
| Answer» A. Propeller turbine | |
| 85. |
Francis and Kaplan turbines are known as |
| A. | Impulse turbine |
| B. | Reaction turbine |
| C. | Axial flow turbine |
| D. | Mixed flow turbine |
| Answer» B. Reaction turbine | |
| 86. |
Specific speed of reaction turbine is between? |
| A. | 5 and 50 |
| B. | 10 and 100 |
| C. | 100 and 150 |
| D. | 150 and 300 |
| Answer» B. 10 and 100 | |
| 87. |
Impulse turbine is generally fitted at |
| 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. |
| Answer» B. Above the tail race | |
| 88. |
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. |
| Answer» D. Energy available, Direction of flow, Head at inlet. | |
| 89. |
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 |
| Answer» A. Type of energy at inlet | |
| 90. |
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 |
| Answer» B. Direction of flow through runner | |
| 91. |
High head, low head and medium head 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 |
| Answer» C. Head at inlet of turbine | |
| 92. |
Low specific speed, high specific speed and medium specific speed 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 |
| Answer» D. Specific speed of turbine | |
| 93. |
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 |
| Answer» A. Type of energy at inlet | |
| 94. |
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 |
| Answer» D. Mixed flow turbine | |
| 95. |
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 |
| Answer» B. High head and low discharge | |
| 96. |
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 |
| Answer» A. Low head and high discharge | |
| 97. |
Medium specific speed of turbine implies |
| A. | Pelton turbine |
| B. | Kaplan turbine |
| C. | Francis turbine |
| D. | Propeller turbine |
| Answer» C. Francis turbine | |
| 98. |
High specific speed of turbine implies that it is_ |
| A. | Francis turbine |
| B. | Propeller turbine |
| C. | Pelton turbine |
| D. | Kaplan turbine |
| Answer» D. Kaplan turbine | |
| 99. |
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. |
| Answer» D. Flow of water, measure of discharge, angle of deflection. | |
| 100. |
In which of following turbine inlet and outlet blade velocities of vanes are equal? |
| A. | Francis turbine |
| B. | Kaplan turbine |
| C. | Pelton turbine |
| D. | Propeller turbine |
| Answer» C. Pelton turbine | |
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