MCQOPTIONS
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MCQOPTIONS
This section includes 243 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
For a diffuser, the vertical intercept between EGL and HGL |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | may increase or decrease |
| Answer» C. remains constant | |
| 52. |
To convert the non-conservative integral equation of mass conservation into the conservative integral form, which of these theorems is used? |
| A. | stokes theorem |
| B. | kelvin-stokes theorem |
| C. | gauss-siedel theorem |
| D. | gauss divergence theorem |
| Answer» E. | |
| 53. |
A beaker is filled with a liquid up to the mark of one litre and weighed. The weight of the liquid is found to be 6.5 N. The specific volume of the liquid will be |
| A. | 1 l =kg |
| B. | 1:5 l =kg |
| C. | 2 l =kg |
| D. | 2:5 l =kg |
| Answer» C. 2 l =kg | |
| 54. |
The physical principle behind the continuity equation is |
| A. | mass conservation |
| B. | zeroth law of thermodynamics |
| C. | first law of thermodynamics |
| D. | energy conservation |
| Answer» B. zeroth law of thermodynamics | |
| 55. |
A beaker is filled with a liquid up to the mark of one litre and weighed. The weight of the liquid is found to be 6.5 N. The specific weight of the liquid will be |
| A. | 6:5 kn = m3 |
| B. | 6:6 kn = m3 |
| C. | 6:7 kn = m3 |
| D. | 6:8 kn = m3 |
| Answer» B. 6:6 kn = m3 | |
| 56. |
and v2? |
| A. | v1 > v2 |
| B. | v1 < v2 |
| C. | v1 = v2 |
| D. | cannot be determined due to insufficient information. |
| Answer» C. v1 = v2 | |
| 57. |
]/[M] = [M-1L3]. |
| A. | [ml-3 t -2]. |
| B. | [ml3 t-2]. |
| C. | [ml-2 t-2]. |
| D. | [ml2 t-2]. |
| Answer» D. [ml2 t-2]. | |
| 58. |
] = [ML-3]. |
| A. | [m1 l-3 t0]. |
| B. | [m1 l0 t0]. |
| C. | [m0 l-3 t0]. |
| D. | [m0 l0 t0]. |
| Answer» E. | |
| 59. |
Which one of the following is the dimension of mass density? |
| A. | [m1 l-3 t0]. |
| B. | [m1 l3 t0]. |
| C. | [m0 l-3 t0]. |
| D. | [m0 l3 t0]. |
| Answer» B. [m1 l3 t0]. | |
| 60. |
Which one of the following is the unit of mass density? |
| A. | kg = m3 |
| B. | kg = m2 |
| C. | kg = m |
| D. | kg = ms |
| Answer» B. kg = m2 | |
| 61. |
Combination governing involves usage of two or more governing. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 62. |
turbine |
| A. | decreases |
| B. | increases |
| C. | remains same |
| D. | independent |
| Answer» B. increases | |
| 63. |
increases beyond 110 percent, we use |
| A. | throttle governing |
| B. | steam governing |
| C. | nozzle governing |
| D. | emergency governing |
| Answer» E. | |
| 64. |
What is the unit of steam rate? |
| A. | kg |
| B. | kg/m |
| C. | kg/kwh |
| D. | n/m |
| Answer» D. n/m | |
| 65. |
When bypass valve is opened to |
| A. | increase pressure |
| B. | increase unit speed |
| C. | increase unit power |
| D. | increase the amount of fresh steam |
| Answer» E. | |
| 66. |
During the steam turbine governing, what remains a constant? |
| A. | speed of rotation |
| B. | flow rate |
| C. | pump head |
| D. | volume of fluid |
| Answer» B. flow rate | |
| 67. |
Which among the following control the flow rate? |
| A. | valve |
| B. | pump |
| C. | head |
| D. | tank pipe |
| Answer» B. pump | |
| 68. |
The advantage of nozzle governing is that no regulating pressure is applied. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 69. |
When do we apply by pass governing? |
| A. | when turbine is overloaded |
| B. | when unit speed decreases |
| C. | when unit power increases |
| D. | when unit pressure decreases |
| Answer» B. when unit speed decreases | |
| 70. |
What is primary objective of steam turbine governing? |
| A. | maintain constant speed |
| B. | maintain constant pressure |
| C. | maintain constant temperature |
| D. | maintain constant expansion |
| Answer» B. maintain constant pressure | |
| 71. |
In nozzle governing, the flow rate of steam is regulated by |
| A. | nozzles |
| B. | pumping |
| C. | drafting |
| D. | intercooling |
| Answer» B. pumping | |
| 72. |
governing? |
| A. | controls speed |
| B. | controls flow rate |
| C. | controls volume |
| D. | controls discharge |
| Answer» C. controls volume | |
| 73. |
The horizontal portion of the draft tube is usually bent to prevent entry of air from the exit end. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 74. |
The flow rate of steam is controlled by regulating the |
| A. | steam |
| B. | pressure |
| C. | temperature |
| D. | speed |
| Answer» C. temperature | |
| 75. |
type draft tube? |
| A. | 10 |
| B. | 30 |
| C. | 60 |
| D. | 90 |
| Answer» D. 90 | |
| 76. |
The other name for elbow with varying cross section tube is called |
| A. | pressure tube |
| B. | bent draft tube |
| C. | velocity tube |
| D. | sink tube |
| Answer» C. velocity tube | |
| 77. |
Properties that do not affect a draft tube is |
| A. | pressure |
| B. | temperature |
| C. | pressure velocity |
| D. | velocity |
| Answer» C. pressure velocity | |
| 78. |
The exit diameter for a simple elbow draft tube should be |
| A. | large |
| B. | small |
| C. | very small |
| D. | same |
| Answer» B. small | |
| 79. |
The simple elbow draft tube helps to cut down the cost of excavation. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 80. |
Which of the following is a 50 percent reaction turbine? |
| A. | parsons turbine |
| B. | curtis turbine |
| C. | rateau turbine |
| D. | pelton wheel |
| Answer» B. curtis turbine | |
| 81. |
Turbine that consists of draft tubes is called as |
| A. | impulse turbine |
| B. | curtis turbine |
| C. | rateau turbine |
| D. | reaction turbine |
| Answer» E. | |
| 82. |
What is the maximum value of efficiency in a draft tube? |
| A. | 100 |
| B. | 50 |
| C. | 90 |
| D. | 40 |
| Answer» D. 40 | |
| 83. |
What is the purpose of a Draft tube? |
| A. | to prevent flow separation |
| B. | to avoid pressure drag |
| C. | to prevent rejection of heat |
| D. | to increase efficiency |
| Answer» B. to avoid pressure drag | |
| 84. |
Draft tube consists of conical diffuser with angles of |
| A. | 10 deg |
| B. | 20 deg |
| C. | 30 deg |
| D. | 40 deg |
| Answer» B. 20 deg | |
| 85. |
Most common application of the draft tube is |
| A. | rotor |
| B. | motor |
| C. | pump |
| D. | filter |
| Answer» D. filter | |
| 86. |
A draft tube helps in converting kinetic energy into |
| A. | electrical work |
| B. | mechanical work |
| C. | chemical work |
| D. | thermal work |
| Answer» C. chemical work | |
| 87. |
Draft tube is also called |
| A. | straight divergent tube |
| B. | simple elbow tube |
| C. | thermal tube |
| D. | elbow tube with varying cross section |
| Answer» B. simple elbow tube | |
| 88. |
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» C. below the tail race | |
| 89. |
Specific speed of reaction turbine is between? |
| A. | 5 and 50 |
| B. | 10 and 100 |
| C. | 100 and 150 |
| D. | 150 and 300 |
| Answer» C. 100 and 150 | |
| 90. |
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» E. | |
| 91. |
Francis and Kaplan turbines are known as |
| A. | impulse turbine |
| B. | reaction turbine |
| C. | axial flow turbine |
| D. | mixed flow turbine |
| Answer» C. axial flow turbine | |
| 92. |
turbines, if vanes are fixed to hub of turbine |
| A. | propeller turbine |
| B. | francis turbine |
| C. | kaplan turbine |
| D. | pelton turbine |
| Answer» B. francis turbine | |
| 93. |
generating power |
| A. | thermal power |
| B. | nuclear power |
| C. | hydroelectric power |
| D. | electric power |
| Answer» D. electric power | |
| 94. |
Pen stocks are made up of |
| A. | steel |
| B. | cast iron |
| C. | mild steel |
| D. | wrought iron |
| Answer» B. cast iron | |
| 95. |
The electric power which is obtained from hydraulic energy |
| A. | thermal power |
| B. | mechanical power |
| C. | solar power |
| D. | hydroelectric power |
| Answer» E. | |
| 96. |
category of |
| A. | energy absorbing machines |
| B. | energy generating machines |
| C. | power absorbing machines |
| D. | energy transfer machines |
| Answer» E. | |
| 97. |
In the figure shown below, which of the following type of runners has the blade curvature as shown in the above figure (The arrow denotes direction of blade motion)? |
| A. | information insufficient to determine |
| B. | slow runner |
| C. | medium runner |
| D. | fast runner |
| Answer» C. medium runner | |
| 98. |
In the velocity diagrams for Francis turbine, which of the following velocity directions is along the blade curvature? |
| A. | vr1 |
| B. | vw1 |
| C. | v1 |
| D. | u1 |
| Answer» B. vw1 | |
| 99. |
In case of a Medium runner, tan (α1) CANNOT be given by (α1 = Guide vane angle at inlet)? |
| A. | vf1 / vw1 |
| B. | vr1 / vw1 |
| C. | vr1 / u1 |
| D. | vw1 / u1 |
| Answer» E. | |
| 100. |
have the highest vane angle at inlet (β1 value)? |
| A. | slow runner |
| B. | medium runner |
| C. | fast runner |
| D. | vane angle is defined only for kaplan turbines and not francis turbines |
| Answer» D. vane angle is defined only for kaplan turbines and not francis turbines | |