McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
| 101. |
Which of the following pump is sucessfully used for lifting water to the boilers? |
| A. | Centrifugal pump |
| B. | Reciprocating pump |
| C. | Jet pump |
| D. | Air-lift pump |
| Answer» C. Jet pump | |
| 102. |
The flow ratio in case of Francis turbine varies from |
| A. | 0.15 to 0.3 |
| B. | 0.4 to 0.5 |
| C. | 0.6 to 0.9 |
| D. | 1 to 15 |
| Answer» A. 0.15 to 0.3 | |
| 103. |
Which type of the pump is defferent from others in the same group? |
| A. | Screw pump |
| B. | Gear pump |
| C. | Cam and piston pump |
| D. | Plunger pump |
| Answer» D. Plunger pump | |
| 104. |
The ratio of actual work available at the turbine to the energy imparted to the wheel is known as |
| A. | hydraulic |
| B. | mechanical |
| C. | overall |
| Answer» B. mechanical | |
| 105. |
The working of which of the following hydraulic units is based on Pascal's law? |
| A. | Air lift pump |
| B. | Jet pump |
| C. | Hydraulic coupling |
| D. | Hydraulic press |
| Answer» D. Hydraulic press | |
| 106. |
A draft tube is used with impulse turbines. |
| A. | Yes |
| B. | No |
| Answer» B. No | |
| 107. |
The static head of a centrifugal pump is equal to the |
| A. | product |
| B. | difference |
| C. | sum |
| Answer» C. sum | |
| 108. |
The overall efficiency of an impulse turbine is the ratio of the actual power produced by the turbine to the energy actually supplied by the turbine. |
| A. | Yes |
| B. | No |
| Answer» A. Yes | |
| 109. |
A jet of water enters and leaves a fixed curved vane tangentially. The force of jet along perpendicular to the vane is zero. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 110. |
A Francis turbine is an outward flow reaction turbine. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 111. |
The mechanical efficiency of an impulse turbine is |
| 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» B. ratio of the actual work available at the turbine to the energy imparted to the wheel | |
| 112. |
In a Francis turbine runner, the number of blades are generally between |
| A. | 2 to 4 |
| B. | 4 to 8 |
| C. | 8 to 16 |
| D. | 16 to 24 |
| Answer» D. 16 to 24 | |
| 113. |
The function of guide vanes in a reaction turbine is to |
| A. | allow the water to enter the runner without shock |
| B. | allow the water to flow over them, without forming eddies |
| C. | allow the required quantity of water to enter the turbine |
| D. | all of the above |
| Answer» D. all of the above | |
| 114. |
If the net positive suction head (NPSH) requirement for the pump is not satisfied, then |
| A. | no flow will take place |
| B. | cavitation will be formed |
| C. | efficiency will be low |
| D. | excessive power will be consumed |
| Answer» B. cavitation will be formed | |
| 115. |
Manometric head is the actual head of water against which a centrifugal pump has to work |
| A. | Right |
| B. | Wrong |
| Answer» A. Right | |
| 116. |
The maximum efficiency of jet propulsion of a ship with inlet orifices at right angles to the direction of motion of ship, is |
| A. | 40% |
| B. | 50% |
| C. | 60% |
| D. | 80% |
| Answer» B. 50% | |
| 117. |
A reciprocating pump is also called a |
| A. | positive |
| B. | negative |
| Answer» A. positive | |
| 118. |
Which of the following statement is correct? |
| A. | In an impulse turbine, the water impinges on the buckets with pressure energy. |
| B. | In a reaction turbine, the water glides over the moving vanes with kinetic energy. |
| C. | In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure |
| D. | In a reaction turbine, the pressure of the flowing water increases after gliding over the vanes. |
| Answer» C. In an impulse turbine, the pressure of the flowing water remains unchanged and is equal to atmospheric pressure | |
| 119. |
If the ratio of all the corresponding linear dimensions are equal, then the model and the prototype are said to have |
| A. | geometric similarity |
| B. | kinematic similarity |
| C. | dynamic similarity |
| D. | none of these |
| Answer» A. geometric similarity | |
| 120. |
If the ratios of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have. |
| A. | geometric similarity |
| B. | kinematic similarity |
| C. | dynamic similarity |
| D. | none of these |
| Answer» C. dynamic similarity | |
| 121. |
Which of the following pump is sucessfully used for lifting water to the turbines? |
| A. | Centrifugal pump |
| B. | Reciprocating pump |
| C. | Jet pump |
| D. | Air-lift pump |
| Answer» C. Jet pump | |
| 122. |
A centrifugal pump will start delivering liquid only when the pressure rise in the impeller is equal to the |
| A. | kinetic head |
| B. | velocity head |
| C. | manometric head |
| D. | static head |
| Answer» C. manometric head | |
| 123. |
In a Francis turbine, the pressure at inlet is |
| A. | less than |
| B. | more than |
| Answer» B. more than | |
| 124. |
The maximum number of jets, generally, employed in an impulse turbine without jet interference are |
| A. | two |
| B. | four |
| C. | six |
| D. | eight |
| Answer» C. six | |
| 125. |
Which of the following hydraulic unit is used for transmitting increased or decreased torque to the driven shaft? |
| A. | Hydraulic ram |
| B. | Hydraulic intensifier |
| C. | Hydraulic torque converter |
| D. | Hydraulic accumulator |
| Answer» C. Hydraulic torque converter | |
| 126. |
The head available at the inlet of the turbine is known as net or effective head. |
| A. | Correct |
| B. | Incorrect |
| Answer» A. Correct | |
| 127. |
A double overhung Pelton wheel has |
| A. | two jets |
| B. | two runners |
| C. | four jets |
| D. | four runners |
| Answer» B. two runners | |
| 128. |
The air vessel, in a reciprocating pump, is a cast iron closed chamber having an opening at its base. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 129. |
The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. 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 mixed flow at outlet |
| Answer» D. high speed with mixed flow at outlet | |
| 130. |
Discharge of a centrifugal pump is |
| A. | directly proportional to diameter of its impeller |
| B. | inversely proportional to diameter of its impeller |
| C. | directly proportional to (diameter)2 of its impeller |
| D. | inversely proportional to (diameter)2 of its impeller |
| Answer» D. inversely proportional to (diameter)2 of its impeller | |
| 131. |
In an outward 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» B. the water enters at the centre of the wheel and then flows towards the outer periphery of the wheel | |
| 132. |
Which of the following turbine is preferred for a specific speed of 60 to 300 r.p.m.? |
| A. | Pelton wheel |
| B. | Francis turbine |
| C. | Kaplan turbine |
| D. | none of these |
| Answer» B. Francis turbine | |
| 133. |
The Thomson's turbine is |
| A. | an axial flow |
| B. | an inward flow |
| C. | an outward flow |
| D. | a mixed flow |
| Answer» C. an outward flow | |
| 134. |
The power of a centrifugal pump working under constant head and discharge increases with the speed. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 135. |
A reciprocating pump is suitable for less discharge and higher heads. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 136. |
The breast water wheels are those in which the wheel runs partly by the weight of water and partly by the impulse of water. |
| A. | True |
| B. | False |
| Answer» A. True | |
| 137. |
The speed ratio in case of Francis turbine varies from |
| A. | 0.15 to 0.3 |
| B. | 0.4 to 0.5 |
| C. | 0.6 to 0.9 |
| D. | 1 to 15 |
| Answer» C. 0.6 to 0.9 | |
| 138. |
Multi-stage centrifugal pumps are used to |
| A. | give high discharge |
| B. | produce high heads |
| C. | pump viscous fluids |
| D. | all of these |
| Answer» B. produce high heads | |
| 139. |
If the Francis turbine is run below 50 percent head for a long period, it will not only lose its efficiency but also the cavitation danger will become more serious. |
| A. | Agree |
| B. | Disagree |
| Answer» A. Agree | |
| 140. |
The hydraulic efficiency of an impulse turbine is maximum when velocity of wheel is |
| A. | one-fourth |
| B. | one-half |
| C. | three-fourth |
| D. | double |
| Answer» B. one-half | |
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