McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
Chapters
| 201. |
The outward radial flow reaction turbine is a turbine in which direction of water flow is |
| A. | Radial direction |
| B. | Radially inward |
| C. | Radially outward |
| D. | Axial direction |
| Answer» C. Radially outward | |
| 202. |
The energy available at inlet for outward reaction flow turbine is |
| A. | Potential |
| B. | Kinetic energy |
| C. | Pressure energy |
| D. | Pressure energy and Kinetic energy |
| Answer» D. Pressure energy and Kinetic energy | |
| 203. |
Centrifugal head in Outward flow reaction turbine |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Gradually decreases |
| Answer» A. Increases | |
| 204. |
Discharge in outward flow reaction turbine |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Gradually decreases |
| Answer» A. Increases | |
| 205. |
Speed control of Outward flow reaction turbine is |
| A. | Easy |
| B. | Moderate |
| C. | Difficult |
| D. | Very difficult |
| Answer» D. Very difficult | |
| 206. |
Tendency of wheel to race is predominant in turbine |
| A. | Inward flow reaction turbine |
| B. | Outward flow reaction turbine |
| C. | Impulse turbine |
| D. | Axial flow turbine |
| Answer» B. Outward flow reaction turbine | |
| 207. |
Outward flow reaction turbine will quite suitable for_ |
| A. | High head |
| B. | Medium head |
| C. | Low head |
| D. | Static head |
| Answer» B. Medium head | |
| 208. |
In outward flow reaction turbine tangential velocity at inlet is always_ than outlet velocity. |
| A. | Equal |
| B. | Less |
| C. | More |
| D. | Constant |
| Answer» B. Less | |
| 209. |
In outward radial flow reaction turbine if angle made by absolute velocity with its tangent is 90 degrees and component of whirl is zero at inlet is |
| A. | Radial inlet discharge |
| B. | Radial outlet discharge |
| C. | Flow ratio |
| D. | Speed ratio |
| Answer» A. Radial inlet discharge | |
| 210. |
The main difference between reaction turbine and outward radial flow reaction turbine is water flows |
| A. | Radial direction |
| B. | Radially inward |
| C. | Radially outward |
| D. | Axial direction |
| Answer» B. Radially inward | |
| 211. |
In outward radial flow reaction turbine the ratio of tangential wheel at inlet to given velocity of jet is known as |
| A. | Speed ratio |
| B. | Flow ratio |
| C. | Discharge |
| D. | Radial discharge |
| Answer» B. Flow ratio | |
| 212. |
Conical diffuser draft tube is also called |
| A. | Straight divergent tube |
| B. | Simple elbow tube |
| C. | Thermal tube |
| D. | Elbow tube with varying cross section |
| Answer» A. Straight divergent tube | |
| 213. |
The simple elbow draft tube is placed close to the_ |
| A. | Head race |
| B. | Tail race |
| C. | Tank |
| D. | Nozzle |
| Answer» B. Tail race | |
| 214. |
Turbine that consists of moving nozzles and with fixed nozzles is called as |
| A. | Impulse turbine |
| B. | Curtis turbine |
| C. | Rateau turbine |
| D. | Reaction turbine |
| Answer» D. Reaction turbine | |
| 215. |
An example of reaction turbine is_ |
| A. | Parsons turbine |
| B. | Curtis turbine |
| C. | Rateau turbine |
| D. | Pelton wheel |
| Answer» A. Parsons turbine | |
| 216. |
When we arrange turbine blades in multiple stages it is called |
| A. | Pressure change |
| B. | Vane deviation |
| C. | Compounding |
| D. | Pressure ratio |
| Answer» C. Compounding | |
| 217. |
Compounding is needed to |
| A. | Increase Pressure |
| B. | Decrease temperature |
| C. | Change volume |
| D. | Increase efficiency |
| Answer» D. Increase efficiency | |
| 218. |
Which among the following is not a type of compounding? |
| A. | Pressure |
| B. | Temperature |
| C. | Pressure velocity |
| D. | Velocity |
| Answer» B. Temperature | |
| 219. |
Newtons second law describes the transfer of energy through impulse turbines. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 220. |
Inner radial flow extracts energy from |
| A. | Turbine blades |
| B. | Moving fluid |
| C. | Pressure change |
| D. | Temperature increase |
| Answer» B. Moving fluid | |
| 221. |
Reaction turbines develop torque by reacting to the gas or fluids pressure or mass. |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» A. True | |
| 222. |
What is the water flow direction in the runner in a Francis turbine? |
| A. | Axial and then tangential |
| B. | Tangential and then axial |
| C. | Radial and then axial |
| D. | Axial and then radial |
| Answer» C. Radial and then axial | |
| 223. |
Which of the following is true in case of flow of water before it enters the runner of a Francis Turbine? |
| A. | Available head is entirely converted to velocity head |
| B. | Available head is entire converted to pressure head |
| C. | Available head is neither converted to pressure head nor velocity head |
| D. | Available head is partly converted to pressure head and partly to velocity head |
| Answer» D. Available head is partly converted to pressure head and partly to velocity head | |
| 224. |
Why does the cross sectional area of the Spiral casing gradually decrease along the circumference of the Francis turbine from the entrance to the tip? |
| A. | To ensure constant velocity of water during runner entry |
| B. | To prevent loss of efficiency of the turbine due to impulsive forces caused by extra area |
| C. | To prevent leakage from the turbine |
| D. | To reduce material costs in order to make the turbine more economical |
| Answer» A. To ensure constant velocity of water during runner entry | |
| 225. |
Which of the following profiles are used for guide vanes to ensure smooth flow without separation? |
| A. | Rectangular |
| B. | Bent Rectangular |
| C. | Elliptical |
| D. | Aerofoil |
| Answer» D. Aerofoil | |
| 226. |
In which of the following type of runners the velocity of whirl at inlet is greater than the blade velocity? |
| A. | Such a case is practically impossible |
| B. | Slow Runner |
| C. | Medium Runner |
| D. | Fast Runner |
| Answer» B. Slow Runner | |
| 227. |
Which of the following runner types will 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» C. Fast Runner | |
| 228. |
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» D. Vw1 / u1 | |
| 229. |
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» A. Vr1 | |
| 230. |
In the figure shown below,which of the following angles replace the question mark? |
| A. | Guide vane angle at inlet |
| B. | Blade angle at inlet |
| C. | Vane angle at inlet |
| D. | Blade angle at outlet |
| Answer» A. Guide vane angle at inlet | |
| 231. |
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» B. Slow Runner | |
| 232. |
Francis turbine is typically used for which of the following values of available heads? |
| A. | 300 m |
| B. | 100 m |
| C. | 30 m |
| D. | 5 m |
| Answer» B. 100 m | |
| 233. |
Water flow velocity is given 10 m/s. The runner diameter is 3 m and the width of the wheel is 25 cm. Find the mass of water (kg) flowing across the runner per second. |
| A. | 7500π |
| B. | 50π |
| C. | 300π |
| D. | RPM of the turbine needs to be given |
| Answer» A. 7500π | |
| 234. |
Work done per second by a Francis turbine can be given by ρAVf (Vw1u1 + Vw2u2). |
| A. | True |
| B. | False |
| C. | none |
| D. | none |
| Answer» B. False | |
| 235. |
Which of the following terms is considered to be zero while deriving the equation for work done per second for Francis Turbine? |
| A. | Vr1 |
| B. | Vw2 |
| C. | Vf2 |
| D. | Vr2 |
| Answer» B. Vw2 | |
| 236. |
Power developed by Francis turbine are calculated for a certain set of conditions. Now, the inlet whirl velocity is doubled, the blade velocity at inlet is doubled and the flow velocity is quartered. The power developed: |
| A. | Is 4 times the original value |
| B. | Is 2 times the original value |
| C. | Is ½ times the original value |
| D. | Is same as the original value |
| Answer» D. Is same as the original value | |
| 237. |
Volume flow rate of water in a Francis turbine runner is 25 m3/s. The flow velocity, whirl velocity and blade velocity are 11 m/s, 10 m/s and 5 m/s respectively, all values given at runner inlet. Find the power developed by the turbine. |
| A. | 25 kW |
| B. | 1.25 MW |
| C. | 1.25 kW |
| D. | 25 MW |
| Answer» B. 1.25 MW | |
| 238. |
The flow rate of the water flow in a Francis turbine is increased by 50% keeping all the other parameters same. The work done by the turbine changes by? |
| A. | 50% increase |
| B. | 25% increase |
| C. | 100% increase |
| D. | 150% increase |
| Answer» A. 50% increase | |
| 239. |
A student performs an experiment with a Francis turbine. He accidently set the RPM of Francis turbine to 1400 rpm instead of 700 rpm. He reported the power to be 1 MW. His teacher asks him to perform the same experiment using the correct RPM. The student performs the same experiment again, but this time the erroneously doubled the flow velocity. What does the student report the power to be? |
| A. | 0.5 MW |
| B. | 0.25 MW |
| C. | 2 MW |
| D. | 1 MW |
| Answer» D. 1 MW | |
| 240. |
The available head of a Francis Turbine is 100 m. Velocity of the flow at the runner inlet is 15 m/s. Find the flow ratio. |
| A. | 0.33 |
| B. | 0.45 |
| C. | 0.67 |
| D. | 0.89 |
| Answer» A. 0.33 | |
| 241. |
How does the flow ratio (ψ) of a Francis turbine vary with available head (H)? |
| A. | ψ α H |
| B. | ψ α 1/H |
| C. | ψ α sqrt (H) |
| D. | ψ α 1/(sqrt (H)) |
| Answer» D. ψ α 1/(sqrt (H)) | |
| 242. |
What is the typical value for flow ratio in a Francis turbine? |
| A. | 0.05 – 0.1 |
| B. | 0.15 – 0.30 |
| C. | 0.35 – 0.45 |
| D. | 0.50 – 0.60 |
| Answer» B. 0.15 – 0.30 | |
| 243. |
The available head of a Francis Turbine is 120 m. The blade velocity is given 35 m/s. Find the speed ratio of the turbine. |
| A. | 0.56 |
| B. | 0.61 |
| C. | 0.71 |
| D. | 0.81 |
| Answer» C. 0.71 | |
| 244. |
The speed ratio (φ) varies directly with which of the following parameters? |
| A. | Vw1 |
| B. | V1 |
| C. | N (RPM) |
| D. | H (Available head) |
| Answer» C. N (RPM) | |
| 245. |
The typical value range of speed ratio for a Francis turbine is: |
| A. | 0.3 – 0.6 |
| B. | 0.5 – 0.6 |
| C. | 0.1 – 0.4 |
| D. | 0.6 – 0.9 |
| Answer» D. 0.6 – 0.9 | |
| 246. |
Which of the following efficiencies for Francis Turbine is described as the ratio between the power produced by runner to the power supplied by water at the inlet? |
| A. | Hydraulic efficiency |
| B. | Volumetric efficiency |
| C. | Mechanical efficiency |
| D. | Overall efficiency |
| Answer» A. Hydraulic efficiency | |
| 247. |
Which of the following efficiencies for Francis Turbine is described as the ratio between total quantity of water over runner blades to total quantity of water supplied to turbine? |
| A. | Hydraulic efficiency |
| B. | Volumetric efficiency |
| C. | Mechanical efficiency |
| D. | Overall efficiency |
| Answer» B. Volumetric efficiency | |
| 248. |
Which of the following efficiencies for Francis Turbine is defined as the ratio between the power available at the shaft of the turbine to the power produced by the runner? |
| A. | Hydraulic efficiency |
| B. | Volumetric efficiency |
| C. | Mechanical efficiency |
| D. | Overall efficiency |
| Answer» C. Mechanical efficiency | |
| 249. |
Which of the following efficiencies for Francis Turbine is defined as the ratio between the power available at the shaft to the power supplied by water at the inlet? |
| A. | Hydraulic efficiency |
| B. | Volumetric efficiency |
| C. | Mechanical efficiency |
| D. | Overall efficiency |
| Answer» D. Overall efficiency | |
| 250. |
The whirl velocity at inlet of Francis turbine is given to be 20 m/s. The blade velocity is given as 35 m/s. What is the hydraulic efficiency for a head of 100 m? |
| A. | 80% |
| B. | 90% |
| C. | 70% |
| D. | 98% |
| Answer» C. 70% | |
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