McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 51. |
A hydraulic press is a device used |
| A. | to store pressure energy which may be supplied to a machine later on |
| B. | to increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure |
| C. | to lift larger load by the application of a comparatively much smaller force |
| D. | all of the above |
| Answer» C. to lift larger load by the application of a comparatively much smaller force | |
| 52. |
Power required to drive a centrifugal pump is |
| A. | directly |
| B. | inversely |
| Answer» A. directly | |
| 53. |
Slip of a reciprocating pump is defined as the |
| A. | ratio of actual discharge to the theoretical discharge |
| B. | sum of actual discharge and the theoretical discharge |
| C. | difference of theoretical discharge and the actual discharge |
| D. | product of theoretical discharge and the actual discharge |
| Answer» C. difference of theoretical discharge and the actual discharge | |
| 54. |
Work done by a turbine |
| A. | depends |
| B. | does not depend |
| Answer» A. depends | |
| 55. |
The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is |
| A. | slow speed pump with radial flow at outlet |
| B. | medium speed pump with radial flow at outlet |
| C. | high speed pump with radia flow at outlet |
| D. | high speed pump with axial flow at outlet |
| Answer» A. slow speed pump with radial flow at outlet | |
| 56. |
Power required to drive a centrifugal pump is directly proportional to |
| A. | diameter |
| B. | square of diameter |
| C. | cube of diameter |
| D. | fourth power of diameter |
| Answer» D. fourth power of diameter | |
| 57. |
The cavitation in a hydraulic machine is mainly due to |
| A. | low velocity |
| B. | high velocity |
| C. | low pressure |
| D. | high pressure |
| Answer» C. low pressure | |
| 58. |
The overall efficiency of a reaction turbine is the ratio of |
| A. | power produced by the turbine to the energy actually suppied by the turbine |
| B. | actual work available at the turbine to the energy imparted to the wheel |
| C. | workdone on the wheel to the energy (or head of water) actually supplied to the turbine |
| D. | none of the above |
| Answer» A. power produced by the turbine to the energy actually suppied by the turbine | |
| 59. |
A Francis turbine is used when the available head of water is |
| A. | 0 to 25 m |
| B. | 25 m to 250 m |
| C. | above 250 m |
| D. | none of these |
| Answer» B. 25 m to 250 m | |
| 60. |
The cavitation in reaction turbines is avoided, to a great extent by |
| A. | installing the turbine below the tail race level |
| B. | using stainless steel runner of the turbine |
| C. | providing highly polished blades to the runner |
| D. | all of the above |
| Answer» D. all of the above | |
| 61. |
A hydraulic intensifier is a device used to increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure. |
| A. | Right |
| B. | Wrong |
| Answer» A. Right | |
| 62. |
In a reaction turbine, the water enters the wheel under pressure and flows over the vanes. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 63. |
The efficiency of jet propulsion for a ship with inlet orifices at right angles to the direction of motion of ship, will be maximum when the relative velocity of the jet and ship is equal to twice the velocity of the ship. |
| A. | Yes |
| B. | No |
| Answer» A. Yes | |
| 64. |
In the above question, the unit speed of the wheel is |
| A. | 10 r.p.m. |
| B. | 20 r.p.m. |
| C. | 40 r.p.m. |
| D. | 80 r.p.m. |
| Answer» B. 20 r.p.m. | |
| 65. |
The specific speed of a centrifugal pump may be defined as the speed of an imaginary pump, identical with the given pump, which will discharge one litre of water, while it is being raised through a head of one metre. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 66. |
In a centrifugal pump, the water enters the impeller |
| A. | axially |
| B. | radially |
| Answer» B. radially | |
| 67. |
In the above question, the saving in case of a double acting reciprocating pump is |
| A. | 39.20% |
| B. | 48.80% |
| C. | 84.80% |
| D. | 88.40% |
| Answer» A. 39.20% | |
| 68. |
The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is |
| A. | slow speed with radial flow at outlet |
| B. | medium speed with radial flow at outlet |
| C. | high speed with radial flow at outlet |
| D. | high speed with axial flow at outlet |
| Answer» D. high speed with axial flow at outlet | |
| 69. |
The hydraulic efficiency of a reaction turbine, is the ratio of |
| A. | power produced by the turbine to the energy actually supplied by the turbine |
| B. | actual work available at the turbine to energy imparted to the wheel |
| C. | workdone on the wheel to the energy (or head of water) actually supplied to the turbine |
| D. | none of the above |
| Answer» C. workdone on the wheel to the energy (or head of water) actually supplied to the turbine | |
| 70. |
Kinematic similarity is said to exist between the model and the prototype, if both of them |
| A. | have identical velocities |
| B. | are equal in size and shape |
| C. | are identical in shape, but differ only in size |
| D. | have identical forces |
| Answer» A. have identical velocities | |
| 71. |
By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is |
| A. | 39.20% |
| B. | 48.80% |
| C. | 84.80% |
| D. | 88.40% |
| Answer» C. 84.80% | |
| 72. |
The discharge through a reaction turbine |
| A. | remains same |
| B. | increases |
| C. | decreases |
| Answer» C. decreases | |
| 73. |
The power produced by the reaction turbine is |
| A. | directly proportional |
| B. | inversely proportional |
| Answer» A. directly proportional | |
| 74. |
A hydraulic accumulator is a device used to store |
| A. | strain |
| B. | pressure |
| C. | kinetic |
| Answer» B. pressure | |
| 75. |
Braking jet in an impulse turbine is used |
| A. | to break the jet of water |
| B. | to bring the runner to rest in a short time |
| C. | to change the direction of runner |
| D. | none of the above |
| Answer» B. to bring the runner to rest in a short time | |
| 76. |
Mechanical efficiency of a centrifugal pump is the ratio of |
| A. | energy available at the impeller to the energy supplied to the pump by the prime mover |
| B. | actual workdone by the pump to the energy supplied to the sump by the prime mover |
| C. | energy supplied to the pump to the energy available at the impeller |
| D. | manometric head to the energy supplied by the impeller per kN of water |
| Answer» A. energy available at the impeller to the energy supplied to the pump by the prime mover | |
| 77. |
The impeller of a centrifugal pump may have |
| A. | volute casing |
| B. | volute casing with guide blades |
| C. | vortex casing |
| D. | any one of these |
| Answer» D. any one of these | |
| 78. |
In a mixed flow reaction turbine, the flow of water is partly radial and partly axial. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 79. |
The efficiency of a centrifugal pump will be maximum when the blades are bent backward. |
| A. | Yes |
| B. | No |
| Answer» A. Yes | |
| 80. |
The specific speed of a hydraulic turbine depends upon |
| A. | speed and power developed |
| B. | discharge and power developed |
| C. | speed and head of water |
| D. | speed, power developed and head of water |
| Answer» D. speed, power developed and head of water | |
| 81. |
The speed ratio of a Francis turbine is defined as the ratio of the theoretical jet velocity to the peripheral speed at inlet. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 82. |
A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is |
| A. | one-half |
| B. | one-third |
| C. | two-third |
| D. | three-fourth |
| Answer» B. one-third | |
| 83. |
Slip of a reciprocating pump is negative, when |
| A. | suction pipe is short and pump is running at low speeds |
| B. | delivery pipe is long and pump is running at high speeds |
| C. | suction pipe is short and delivery pipe is long and the pump is running at low speeds |
| D. | suction pipe is long and delivery pipe is short and the pump is running at high speeds |
| Answer» D. suction pipe is long and delivery pipe is short and the pump is running at high speeds | |
| 84. |
The overall efficiency for a Pelton wheel lies between |
| A. | 0.50 to 0.65 |
| B. | 0.65 to 0.75 |
| C. | 0.75 to 0.85 |
| D. | 0.85 to 0.90 |
| Answer» D. 0.85 to 0.90 | |
| 85. |
Which of the following statement is wrong? |
| A. | The reaction turbines are used for low head and high discharge. |
| B. | The angle of taper on draft tube is less than 8? |
| C. | An impulse turbine is generally fitted slightly above the tail race. |
| D. | A Francis turbine is an impulse turbine. |
| Answer» D. A Francis turbine is an impulse turbine. | |
| 86. |
In a reaction turbine, the draft tube is used |
| A. | to run the turbine full |
| B. | to prevent air to enter the turbine |
| C. | to increase the head of water by an amount equal to the height of the runner outlet above the tail race |
| D. | to transport water to downstream |
| Answer» C. to increase the head of water by an amount equal to the height of the runner outlet above the tail race | |
| 87. |
For centrifugal pump impeller, the maximum value of the vane exit angle is |
| A. | 10? to 15? |
| B. | 15? to 20? |
| C. | 20? to 25? |
| D. | 25? to 30? |
| Answer» C. 20? to 25? | |
| 88. |
When the speed of the pump increases, its net positive suction head (NPSH) requirement decreases. |
| A. | Agree |
| B. | Disagree |
| Answer» B. Disagree | |
| 89. |
Which of the following is not an impulse turbine? |
| A. | Girad turbine |
| B. | Turgo turbine |
| C. | Pelton wheel |
| D. | Kaplan turbine |
| Answer» D. Kaplan turbine | |
| 90. |
In an axial flow reaction turbine, the water flows |
| A. | parallel |
| B. | perpendicular |
| Answer» A. parallel | |
| 91. |
The depth of the bucket for a Pelton wheel is generally |
| A. | equal to |
| B. | 1.2 times |
| C. | 1.8 times |
| D. | double |
| Answer» B. 1.2 times | |
| 92. |
The width of the bucket for a Pelton wheel is generally |
| A. | double |
| B. | three times |
| C. | four times |
| D. | five times |
| Answer» D. five times | |
| 93. |
The speed of a turbine runner is |
| A. | directly proportional to H1/2 |
| B. | inversely proportional to H1/2 |
| C. | directly proportional to H3/2 |
| D. | inversely proportional to H3/2 |
| Answer» A. directly proportional to H1/2 | |
| 94. |
The hydraulic efficiency of an impulse turbine is the |
| A. | ratio of the actual power produced by the turbine to the energy actually supplied by the turbine |
| B. | ratio of the actual work available at the turbine to the energy imparted to the wheel |
| C. | ratio of the work done on the wheel to the energy of the jet |
| D. | none of the above |
| Answer» C. ratio of the work done on the wheel to the energy of the jet | |
| 95. |
Which of the following pump is generally used to pump highly viscous fluid? |
| A. | Centrifugal pump |
| B. | Reciprocating pump |
| C. | Air lift pump |
| D. | Screw pump |
| Answer» D. Screw pump | |
| 96. |
An impulse turbine is used for |
| A. | low head of water |
| B. | high head of water |
| C. | medium head of water |
| D. | high discharge |
| Answer» B. high head of water | |
| 97. |
In an inward flow reaction turbine |
| A. | the water flows parallel to the axis of the wheel |
| B. | the water enters at the centre of the wheel and then flows towards the outer periphery of the wheel |
| C. | the water enters the wheel at the outer periphery and then flows towards the centre of the wheel |
| D. | the flow of water is partly radial and partly axial |
| Answer» C. the water enters the wheel at the outer periphery and then flows towards the centre of the wheel | |
| 98. |
The specific speed of a turbine is the speed of an imaginary turbine, identical with the given turbine, which |
| A. | delivers unit discharge under unit head |
| B. | delivers unit discharge under unit speed |
| C. | develops unit power under unit head |
| D. | develops unit power under unit speed |
| Answer» C. develops unit power under unit head | |
| 99. |
The jet ratio is defined as the ratio of the |
| A. | diameter of jet to the diameter of Pelton wheel |
| B. | velocity of jet to the velocity of Pelton wheel |
| C. | diameter of Pelton wheel to the diameter of jet |
| D. | velocity of Pelton wheel to the velocity of jet |
| Answer» C. diameter of Pelton wheel to the diameter of jet | |
| 100. |
The Furneyron turbine is |
| A. | an axial flow |
| B. | an inward flow |
| C. | an outward flow |
| D. | a mixed flow |
| Answer» C. an outward flow | |
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