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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