McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Civil Engineering .
Chapters
| 151. |
Discharge in inward flow reaction turbine |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Gradually decreases |
| Answer» B. Decreases | |
| 152. |
Speed control of Outward flow reaction turbine is |
| A. | Easy |
| B. | Moderate |
| C. | Difficult |
| D. | Very difficult |
| Answer» B. Moderate | |
| 153. |
Centrifugal head in inward flow reaction turbine |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Gradually decreases |
| Answer» B. Decreases | |
| 154. |
Tendency of wheel to race is almost nil in turbine |
| A. | Inward flow reaction turbine |
| B. | Outward flow reaction turbine |
| C. | Impulse turbine |
| D. | Axial flow turbine |
| Answer» A. Inward flow reaction turbine | |
| 155. |
The formation of vapour cavities is called |
| A. | Static pressure drop |
| B. | Cavitation |
| C. | Isentropic expansion |
| D. | Emulsion |
| Answer» B. Cavitation | |
| 156. |
What is the degree of reaction denoted as? |
| A. | D |
| B. | R |
| C. | r |
| D. | d |
| Answer» B. R | |
| 157. |
Voids are created due to |
| A. | Reaction ratio |
| B. | Pressure ratio |
| C. | Liquid free layers |
| D. | Volumetric layers |
| Answer» C. Liquid free layers | |
| 158. |
Cavitation usually occurs due to the changes in |
| A. | Pressure |
| B. | Temperature |
| C. | Volume |
| D. | Heat |
| Answer» A. Pressure | |
| 159. |
Degree of reactions are most commonly used in |
| A. | Turbomachinery |
| B. | Pressure drag |
| C. | Aerodynamics |
| D. | Automobiles |
| Answer» A. Turbomachinery | |
| 160. |
At high pressure, the voids can generate |
| A. | Drag force |
| B. | Mass density |
| C. | Shock waves |
| D. | Flow speed |
| Answer» C. Shock waves | |
| 161. |
Voids that implode near metal surface develops a |
| A. | Drag force |
| B. | Cyclic stress |
| C. | Shock waves |
| D. | Flow speed |
| Answer» B. Cyclic stress | |
| 162. |
In case of gas turbines and compressors, degree of reaction is |
| A. | Static pressure drop in rotor/ static pressure drop in stage |
| B. | Static pressure drop in stage/ static pressure drop in rotor |
| C. | Isentropic enthalpy drop in rotor/ isentropic enthalpy drop in stage |
| D. | Static temperature drop in stage/ static temperature drop in rotor |
| Answer» C. Isentropic enthalpy drop in rotor/ isentropic enthalpy drop in stage | |
| 163. |
The velocities of the blade angles can be found out using |
| A. | Mach number |
| B. | Froude’s number |
| C. | Velocity triangles |
| D. | Reynolds number |
| Answer» C. Velocity triangles | |
| 164. |
Which among the following velocities cannot be found using the velocity triangle? |
| A. | Tangential |
| B. | Whirl |
| C. | Relative |
| D. | Parabolic |
| Answer» D. Parabolic | |
| 165. |
Hydrodynamic cavitation is due to the process of |
| A. | Vaporisation |
| B. | Sedimentation |
| C. | Filtration |
| D. | Excavation |
| Answer» A. Vaporisation | |
| 166. |
The process of bubble generation leads to |
| A. | High temperatures |
| B. | High pressures |
| C. | High energy densities |
| D. | High volumetric ratio |
| Answer» C. High energy densities | |
| 167. |
Degree of reaction turbine is the ratio of? |
| A. | Pressure energy to total energy |
| B. | Kinetic energy to total energy |
| C. | Potential energy to total energy |
| D. | Kinetic energy to potential energy |
| Answer» A. Pressure energy to total energy | |
| 168. |
Which of these options are best suited for the total energy change inside the runner per unit weight? |
| A. | Degree of action |
| B. | Degree of reaction |
| C. | Turbulence |
| D. | Efficiency of turbine |
| Answer» B. Degree of reaction | |
| 169. |
Which of these ratios are termed to be hydraulic efficiency? |
| A. | Water power to delivered power |
| B. | Delivered power to input power |
| C. | Power lost to power delivered |
| D. | Runner power to water power |
| Answer» D. Runner power to water power | |
| 170. |
When a container containing a liquid is rotated, then due to centrifugal action, then which of these energies are changed? |
| A. | Kinetic energy |
| B. | Pressure energy |
| C. | Potential energy |
| D. | Energy due to viscous force |
| Answer» B. Pressure energy | |
| 171. |
For an actual reaction turbine, what should be the angle beta, such that the loss of kinetic energy at the outlet is to be minimum? |
| A. | 90 |
| B. | 45 |
| C. | 60 |
| D. | 30 |
| Answer» A. 90 | |
| 172. |
Discharge through a reaction flow reaction turbine is given by, Q = |
| A. | Pi*d*b*Vf1 |
| B. | Pi*d*d*b*Vf1 |
| C. | Pi*d*b*b*Vf2 |
| D. | Pi*b*b*Vf1 |
| Answer» A. Pi*d*b*Vf1 | |
| 173. |
When the thicknesses of vanes are to be considered in the discharge of a turbine, what will be the area under consideration? |
| A. | Pi*d – n*t |
| B. | Pi*d – n*n*t |
| C. | Pi*d – t*t |
| D. | Pi*d *d– n*t |
| Answer» A. Pi*d – n*t | |
| 174. |
means the angle made by absolute velocity with the tangent on the wheel is 90 degrees and the component of whirl velocity is zero. |
| A. | Axial discharge |
| B. | Tangential discharge |
| C. | Turbulent discharge |
| D. | Radial discharge |
| Answer» D. Radial discharge | |
| 175. |
In a Francis turbine, degree of reaction lies between |
| A. | 0 and 1 |
| B. | 1 and 2 |
| C. | 0 and 0.5 |
| D. | 0.5 and 0.1 |
| Answer» A. 0 and 1 | |
| 176. |
The water from penstocks enters the which is spiral in shape which the area of cross section of casing goes on decreasing gradually |
| A. | guide wheel |
| B. | draft tube |
| C. | casing |
| D. | runner |
| Answer» C. casing | |
| 177. |
If the water flows from inwards to outwards, the turbine is known as |
| A. | Tangential flow turbine |
| B. | Turbulent low inward flow |
| C. | Inward flow turbine |
| D. | Outward flow turbine |
| Answer» D. Outward flow turbine | |
| 178. |
In general, reaction turbines consist of which types of energies? |
| A. | kinetic energy and potential energy |
| B. | potential energy and pressure energy |
| C. | kinetic energy and pressure energy |
| D. | gravitational energy and potential energy |
| Answer» C. kinetic energy and pressure energy | |
| 179. |
is a circular wheel on which a series of smooth, radial curved vanes are fixed. |
| A. | Guide wheel |
| B. | Runner |
| C. | Casing |
| D. | Draft tube |
| Answer» B. Runner | |
| 180. |
In an 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 | |
| 181. |
In an outward radial flow reaction turbine the ratio of tangential velocity at inlet to the given velocity is |
| A. | Speed ratio |
| B. | Flow ratio |
| C. | Discharge |
| D. | Radial discharge |
| Answer» A. Speed ratio | |
| 182. |
Discharge in an outward flow reaction turbine |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | Gradually decreases |
| Answer» A. Increases | |
| 183. |
An outward radial reaction turbine has |
| A. | u1 < u2 |
| B. | u1 > u2 |
| C. | u1 = u2 |
| D. | u2 = u1 = 0 |
| Answer» A. u1 < u2 | |
| 184. |
An outward flow reaction turbine, |
| A. | D1 > D2 |
| B. | D1 < D2 |
| C. | D1 = D2 |
| D. | D1 = D2 = 0 |
| Answer» B. D1 < D2 | |
| 185. |
is ratio of pressure energy change inside runner to total energy change inside runner |
| A. | Degree of reaction |
| B. | Speed ratio |
| C. | Flow ratio |
| D. | Hydraulic efficiency |
| Answer» A. Degree of reaction | |
| 186. |
Degree of reaction for impulse turbine |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» A. 0 | |
| 187. |
Degree of reaction for reaction turbine is |
| A. | 1- cot x /2(cot x –cot y ) |
| B. | 1+ cot x /2(cot x –cot y ) |
| C. | 1- cot x /2(cot x +cot y ) |
| D. | 1+ cot x /2(cot x +cot y ) |
| Answer» A. 1- cot x /2(cot x –cot y ) | |
| 188. |
A turbine is a |
| A. | Rotary mechanical device |
| B. | Static pressure drop device |
| C. | Electrical device |
| D. | Static temperature device |
| Answer» A. Rotary mechanical device | |
| 189. |
Turbine converts |
| A. | Work to energy |
| B. | Energy to work |
| C. | Work to Electricity |
| D. | Work to pressure |
| Answer» B. Energy to work | |
| 190. |
Turbine extracts energy from |
| A. | Reaction ratio |
| B. | Pressure ratio |
| C. | Fluid flow |
| D. | Volumetric ratio |
| Answer» C. Fluid flow | |
| 191. |
Inward flow reaction turbine enter through |
| A. | Outer periphery |
| B. | Blades |
| C. | Inner periphery |
| D. | Pressure angle |
| Answer» A. Outer periphery | |
| 192. |
A turbine is a |
| A. | Turbomachinery |
| B. | Pressure drag |
| C. | Aerodynamics |
| D. | Automobiles |
| Answer» A. Turbomachinery | |
| 193. |
Centrifugal flow is imparted when the_ |
| A. | Reaction flow is negative |
| B. | Reaction flow is positive |
| C. | Efficiency is 100 percent |
| D. | Reaction rate is negligible |
| Answer» C. Efficiency is 100 percent | |
| 194. |
Where is the turbine not used? |
| A. | Solar power |
| B. | Windmill |
| C. | Water wheels |
| D. | Gas plant |
| Answer» A. Solar power | |
| 195. |
In an inward flow reaction turbine the discharge |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent |
| Answer» B. Decreases | |
| 196. |
In impulse turbines with moving blades, there is no in blades of the turbine. |
| A. | Pressure change |
| B. | Same pressure |
| C. | Volumetric change |
| D. | Pressure independent |
| Answer» A. Pressure change | |
| 197. |
In impulse turbines with stationary blades, there is in blades of the turbine. |
| A. | Pressure change |
| B. | Same pressure |
| C. | Volumetric change |
| D. | Pressure independent |
| Answer» A. Pressure change | |
| 198. |
In an outward flow reaction turbine the discharge |
| A. | Increases |
| B. | Decreases |
| C. | Same |
| D. | Independent |
| Answer» A. Increases | |
| 199. |
Before reaching the turbine, the acceleration of the fluid takes place through the |
| A. | Vane angle |
| B. | Nozzle |
| C. | Pump |
| D. | Pipe |
| Answer» B. Nozzle | |
| 200. |
The Pelton wheel extracts energy from |
| A. | Vane angle |
| B. | Moving fluid |
| C. | Increase in temperature |
| D. | Heat rejection |
| Answer» B. Moving fluid | |
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