McqMate
Chapters
| 1. |
The main function of nozzle is to |
| A. | Varying temperatures |
| B. | Pressure variations |
| C. | Load variations |
| D. | Heat variations |
| Answer» B. Pressure variations | |
| 2. |
Which among the following control the flow rate? |
| A. | Valve |
| B. | Pump |
| C. | Head |
| D. | Tank pipe |
| Answer» A. Valve | |
| 3. |
Force exerted by a jet on a stationery plate happens in how many cases? |
| A. | 3 cases |
| B. | 2 cases |
| C. | 1 case |
| D. | Nil |
| Answer» A. 3 cases | |
| 4. |
Force exerted by a jet on a moving plate happens in how many cases? |
| A. | 3 cases |
| B. | 2 cases |
| C. | 1 case |
| D. | Nil |
| Answer» A. 3 cases | |
| 5. |
In a stationery vertical plate, the jet after striking the plate will move |
| A. | In opposite direction |
| B. | Along the plate |
| C. | Perpendicular to the plate |
| D. | Parallel to the plate |
| Answer» B. Along the plate | |
| 6. |
At what angle does the jet deflect after striking a stationery vertical plate? |
| A. | 30 |
| B. | 60 |
| C. | 90 |
| D. | 0 |
| Answer» C. 90 | |
| 7. |
The velocity component after striking the surface will be_ |
| A. | One |
| B. | Zero |
| C. | Infinity |
| D. | Negative |
| Answer» B. Zero | |
| 8. |
Which among the following is the formula for Force when it strikes the plate? |
| A. | pav2 |
| B. | pav |
| C. | pa |
| D. | maE |
| Answer» A. pav2 | |
| 9. |
To derive pav2, we take final velocity minus the initial velocity. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» B. False | |
| 10. |
The mass of water per sec striking the plate is |
| A. | pav2 |
| B. | pav |
| C. | pa |
| D. | maE |
| Answer» B. pav | |
| 11. |
Which among the following is formula for force when it acts along the direction of flow? |
| A. | pav2Sin2θ |
| B. | pav Sin2θ |
| C. | pa Sin2θ |
| D. | maE Sin2θ |
| Answer» A. pav2Sin2θ | |
| 12. |
Which among the following is a formula for force when it acts perpendicular to the direction of flow? |
| A. | pav2 SinθCosθ |
| B. | pav Sin2θ |
| C. | pa Sin2θ |
| D. | maE Sin2θ |
| Answer» A. pav2 SinθCosθ | |
| 13. |
A jet strikes a curved plate at its |
| A. | Sides |
| B. | Surface |
| C. | Centre |
| D. | Does not strike |
| Answer» C. Centre | |
| 14. |
During a weak jump, the value of Froude lies in between |
| A. | 1 to 2.5 |
| B. | 2.5 to 3.5 |
| C. | Less than 1 |
| D. | Zero |
| Answer» A. 1 to 2.5 | |
| 15. |
During an oscillating jump, the value of Froude lies in between |
| A. | 1 to 2.5 |
| B. | 2.5 to 4.5 |
| C. | Less than 1 |
| D. | Zero |
| Answer» A. 1 to 2.5 | |
| 16. |
A jet after striking a smooth plate comes out with a velocity. |
| A. | Increased |
| B. | Decreased |
| C. | Same |
| D. | Zero |
| Answer» C. Same | |
| 17. |
Component of velocity in direction of jet is -VCosθ |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 18. |
Jet propulsion is a method of generating propulsive force by reaction of |
| A. | Accelerating mass |
| B. | Volume |
| C. | Mass flow rate |
| D. | Velocity |
| Answer» A. Accelerating mass | |
| 19. |
The propulsive force drives the jet in the |
| A. | Backward direction |
| B. | Forward direction |
| C. | Perpendicular direction |
| D. | Parallel movement |
| Answer» B. Forward direction | |
| 20. |
Jet propulsion works on the principle of |
| A. | Newton’s first law |
| B. | Newton’s second law |
| C. | Newton’s third law |
| D. | Thermodynamic properties |
| Answer» C. Newton’s third law | |
| 21. |
What does Cv in jet propulsion equation stand for? |
| A. | Area of orifice |
| B. | Velocity |
| C. | Temperature coefficient |
| D. | Velocity coefficient |
| Answer» D. Velocity coefficient | |
| 22. |
The movement of ships and boats in water is due to |
| A. | Water currents |
| B. | Jet propulsion |
| C. | Mass flow rate |
| D. | Volumetric changes |
| Answer» B. Jet propulsion | |
| 23. |
The inlet orifices are at what angle with the motion of the ship? |
| A. | 0 |
| B. | 30 |
| C. | 60 |
| D. | 90 |
| Answer» D. 90 | |
| 24. |
Which among the following is a formula for force when it acts perpendicular to the direction of flow? |
| A. | pav2 SinθCosθ |
| B. | pav Sin2 θ |
| C. | pa Sin2 θ |
| D. | maE Sin2 θ |
| Answer» A. pav2 SinθCosθ | |
| 25. |
Which among the following is the formula for relative velocity? |
| A. | V + u |
| B. | Vu |
| C. | V – u |
| D. | V/u |
| Answer» A. V + u | |
| 26. |
Component of velocity in direction of jet is -VCosθ. What does ‘θ’ indicate? |
| A. | Angle made by jet |
| B. | Angle made by jet and outlet tip |
| C. | Angle made by jet and inlet tip |
| D. | Tangent angle |
| Answer» C. Angle made by jet and inlet tip | |
| 27. |
Principle of fluid mechanics works on the utilization of |
| A. | Accelerating mass |
| B. | Volume |
| C. | Work |
| D. | Velocity |
| Answer» C. Work | |
| 28. |
The force analysis on a curved vane is understood using |
| A. | Velocity triangles |
| B. | Angle of the plate |
| C. | Vane angles |
| D. | Plate dimensions |
| Answer» A. Velocity triangles | |
| 29. |
How is absolute velocity at inlet denoted? |
| A. | V |
| B. | V1 |
| C. | C |
| D. | v |
| Answer» B. V1 | |
| 30. |
The relative velocity is obtained by the equation |
| A. | u – V1 |
| B. | V1 |
| C. | u*V1 |
| D. | u/V1 |
| Answer» A. u – V1 | |
| 31. |
If the friction is neglected, then |
| A. | Vr1 > Vr2 |
| B. | Vr1 < Vr2 |
| C. | Vr1 = Vr2 |
| D. | Vr1 is a zero |
| Answer» C. Vr1 = Vr2 | |
| 32. |
If the pressure remains a constant, then |
| A. | Vr1 > Vr2 |
| B. | Vr1 < Vr2 |
| C. | Vr1 = Vr2 |
| D. | Vr1 is a zero |
| Answer» C. Vr1 = Vr2 | |
| 33. |
Jet propulsion of ship is less efficient than screw propeller due to |
| A. | Pressure |
| B. | Temperature |
| C. | Frictional losses |
| D. | Wear and tear |
| Answer» C. Frictional losses | |
| 34. |
Jet propulsion of ship in a very shallow water is needed to |
| A. | Avoid sinking of the ship |
| B. | Avoid damage of the propeller |
| C. | Avoid current directions |
| D. | Avoid surface damage |
| Answer» B. Avoid damage of the propeller | |
| 35. |
A turbojet does not consist of which of the following component? |
| A. | Compressor |
| B. | Combustion chamber |
| C. | Gas turbine |
| D. | Air filter |
| Answer» D. Air filter | |
| 36. |
Which among the following is not a type of jet engine? |
| A. | Turbojet |
| B. | Ramjet |
| C. | Scramjet |
| D. | Propulsive jet |
| Answer» D. Propulsive jet | |
| 37. |
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 |
| Answer» A. Mechanical Energy | |
| 38. |
Which principle is used in Hydraulic Turbines? |
| A. | Faraday law |
| B. | Newton’s second law |
| C. | Charles law |
| D. | Braggs law |
| Answer» B. Newton’s second law | |
| 39. |
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 |
| Answer» A. Alter the direction of water | |
| 40. |
is the electric power obtained from the energy of the water. |
| A. | Roto dynamic power |
| B. | Thermal power |
| C. | Nuclear power |
| D. | Hydroelectric power |
| Answer» D. Hydroelectric power | |
| 41. |
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 |
| Answer» A. Mechanical Energy | |
| 42. |
Hydraulic Machines fall under the category : |
| A. | Pulverizers |
| B. | Kinetic machinery |
| C. | Condensers |
| D. | Roto-dynamic machinery |
| Answer» D. Roto-dynamic machinery | |
| 43. |
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 |
| Answer» A. Reaction turbines | |
| 44. |
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 |
| Answer» C. Impulse turbines | |
| 45. |
Which type of turbine is a Francis Turbine? |
| A. | Impulse Turbine |
| B. | Screw Turbine |
| C. | Reaction turbine |
| D. | Turgo turbine |
| Answer» C. Reaction turbine | |
| 46. |
How many types of Reaction turbines are there? |
| A. | 5 |
| B. | 4 |
| C. | 3 |
| D. | 9 |
| Answer» A. 5 | |
| 47. |
Maximum Number of jets, generally, employed in an impulse turbine without jet interference can be? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 6 |
| Answer» D. 6 | |
| 48. |
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 |
| Answer» A. Actual work available at the turbine to the energy imparted to the wheel | |
| 49. |
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 |
| Answer» A. To increase the head of water by an amount that is equal to the height of the runner outlet above the tail race | |
| 50. |
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. |
| Answer» B. Ratio of work done on the wheel to energy that is supplied to the turbine. | |
| 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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