McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 151. |
Head loss in nozzles occurs due to __________ |
| A. | pipes head loss |
| B. | pressure loss |
| C. | friction loss |
| D. | none of the mentioned |
| Answer» A. pipes head loss | |
| 152. |
At vena contracta the velocity is _________ and pressure is ___________ |
| A. | lowest, highest |
| B. | highest, highest |
| C. | highest, lowest |
| D. | none of the mentioned |
| Answer» C. highest, lowest | |
| 153. |
When flow converts from supersonic to subsonic then __________ is produced. |
| A. | shock wave |
| B. | pressure drop |
| C. | shock wave & pressure drop |
| D. | none of the mentioned |
| Answer» A. shock wave | |
| 154. |
Shock wave causes instantaneous _________ to the subsonic speed. |
| A. | increase |
| B. | decrease |
| C. | remains constant |
| D. | none of the mentioned |
| Answer» B. decrease | |
| 155. |
Mixture of steam and liquid water is called as _________ |
| A. | dry steam |
| B. | wet steam |
| C. | saturated steam |
| D. | none of the mentioned |
| Answer» B. wet steam | |
| 156. |
Supersaturated steam is also called as _________ |
| A. | saturated steam |
| B. | single phase mix |
| C. | two phase mix |
| D. | none of the mentioned |
| Answer» C. two phase mix | |
| 157. |
If heat is added to the wet steam temperature _________ |
| A. | raises immediately |
| B. | decreases immediately |
| C. | raises after sometime |
| D. | none of the mentioned |
| Answer» C. raises after sometime | |
| 158. |
After steam bubbles break the water surface, they carry water droplets this is called as ________ |
| A. | entrainment |
| B. | capillarity |
| C. | reverse capillarity |
| D. | none of the mentioned |
| Answer» A. entrainment | |
| 159. |
Entrainment happens at __________ |
| A. | liquid surface having contact with atmosphere |
| B. | outlet of the boiler |
| C. | inlet of the boiler |
| D. | none of the mentioned |
| Answer» B. outlet of the boiler | |
| 160. |
Resistance of water dominating the steam is called as _______ |
| A. | hydraulic water hammer |
| B. | erosion |
| C. | contamination |
| D. | none of the mentioned |
| Answer» B. erosion | |
| 161. |
When steam is transported dryness fraction _________ |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | none of the mentioned |
| Answer» B. decreases | |
| 162. |
Coefficient of discharge is the __________ of Actual discharge to the theoretical discharge. |
| A. | ratio |
| B. | product |
| C. | sum |
| D. | none |
| Answer» A. ratio | |
| 163. |
Coefficient of discharge is used to measure ___________ |
| A. | none of the mentioned |
| B. | pressure exerted by the nozzle on the fluid |
| C. | flow rate allowed by the nozzle |
| D. | resistance offered by the nozzle |
| Answer» D. resistance offered by the nozzle | |
| 164. |
Unit of flow resistance is _________ |
| A. | n/m2 |
| B. | m2/n |
| C. | kn/kg |
| D. | no unit |
| Answer» D. no unit | |
| 165. |
Coefficient of discharge is the ____________ |
| A. | product of coefficient of velocity and coefficient of contraction |
| B. | arithmetic sum of coefficient of velocity and coefficient of contraction |
| C. | ratio of coefficient of velocity and coefficient of contraction |
| D. | none of the mentioned |
| Answer» A. product of coefficient of velocity and coefficient of contraction | |
| 166. |
Coefficient of discharge is _____________ |
| A. | directly proportional to coefficient of discharge |
| B. | inversely proportional to square of the coefficient of discharge |
| C. | inversely proportional to coefficient of discharge |
| D. | directly proportional to square of coefficient of discharge |
| Answer» B. inversely proportional to square of the coefficient of discharge | |
| 167. |
For sharp edge orifice, coefficient of discharge lies between ___________ |
| A. | 0.61 – 0.64 |
| B. | 0.87 – 0.89 |
| C. | 0.50 – 0.61 |
| D. | none of the mentioned |
| Answer» A. 0.61 – 0.64 | |
| 168. |
In the equation Cd=1/K(0.5) what does K mean ? |
| A. | pressure drop inside the nozzle |
| B. | mass flow rate |
| C. | flow resistance |
| D. | none of the mentioned |
| Answer» C. flow resistance | |
| 169. |
A turbine having alternate blades and nozzles is called as _______________ |
| A. | impulse turbine |
| B. | reaction turbine |
| C. | impulse & reaction turbine |
| D. | none of the mentioned |
| Answer» A. impulse turbine | |
| 170. |
Multi stage arrangement of turbines is called as __________ |
| A. | impulse turbine |
| B. | reaction turbine |
| C. | compounding |
| D. | none of the mentioned |
| Answer» C. compounding | |
| 171. |
Compounding __________ efficiency at low speed. |
| A. | decrease |
| B. | increase |
| C. | maximizes |
| D. | none of the mentioned |
| Answer» B. increase | |
| 172. |
In velocity compounded turbines flow passage is from ____________ |
| A. | moving blades to fixed nozzles |
| B. | fixed nozzles to moving blades |
| C. | fixed blades to moving nozzles |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 173. |
A velocity compounded impulse turbine is also called as __________ |
| A. | curtis wheel |
| B. | pressure compounded |
| C. | curtis wheel & pressure compounded |
| D. | none of the mentioned |
| Answer» A. curtis wheel | |
| 174. |
Reaction turbine is also called as _________ |
| A. | impulse turbine |
| B. | curtis wheel |
| C. | parsons turbine |
| D. | none of the mentioned |
| Answer» C. parsons turbine | |
| 175. |
Compounding is used for _________ power applications. |
| A. | low |
| B. | high |
| C. | medium |
| D. | none of the mentioned |
| Answer» B. high | |
| 176. |
Which type of boiler is it when the furnace is placed in the region of boiling water? |
| A. | internally fired boiler |
| B. | externally fired boiler |
| C. | babcock-wilcox boiler |
| D. | stirling boiler |
| Answer» A. internally fired boiler | |
| 177. |
What type of boiler is a Lamont boiler? |
| A. | forced circulation |
| B. | natural circulation |
| C. | over-through |
| D. | positive forced circulation |
| Answer» A. forced circulation | |
| 178. |
What is called as the heart of the Lamont boiler? |
| A. | water drum |
| B. | centrifugal pump |
| C. | furnace |
| D. | blower |
| Answer» B. centrifugal pump | |
| 179. |
In what form are the boiler’s tube arrange in Lamont boiler? |
| A. | parallel in vertical |
| B. | inclined vertically |
| C. | parallel in horizontal |
| D. | horizontally inclined |
| Answer» C. parallel in horizontal | |
| 180. |
Through which does the even circulation of feed water is possible in Lamont boiler? |
| A. | nozzles |
| B. | water trough |
| C. | feed pump |
| D. | hose |
| Answer» A. nozzles | |
| 181. |
What is the pressure range between which Lamont boilers operates? |
| A. | 80-120bar |
| B. | 120-160bar |
| C. | 180-360bar |
| D. | 450-560bar |
| Answer» B. 120-160bar | |
| 182. |
What type of steam is generated by evaporator tube of Lamont boiler? |
| A. | saturated steam |
| B. | unsaturated steam |
| C. | superheated steam |
| D. | flash steam |
| Answer» A. saturated steam | |
| 183. |
What is the main disadvantage of Lamont boiler? |
| A. | less flexible in design |
| B. | low heat transfer rate |
| C. | formation of bubbles |
| D. | low steam generation capacity |
| Answer» C. formation of bubbles | |
| 184. |
What type of boiler is a Benson boiler? |
| A. | super critical boiler |
| B. | fire tube boiler |
| C. | natural circulation boiler |
| D. | over-through boiler |
| Answer» A. super critical boiler | |
| 185. |
What is the capacity of Benson boiler? |
| A. | 180 tonnes/hr & above |
| B. | 150 tonnes/hr & above |
| C. | 250 tonnes/hr & above |
| D. | 300 tonnes/hr & above |
| Answer» B. 150 tonnes/hr & above | |
| 186. |
What is the major disadvantage of the Benson boilers? |
| A. | boiler is big in size |
| B. | has large storage capacity |
| C. | deposition of salts |
| D. | bubble formation |
| Answer» C. deposition of salts | |
| 187. |
Why starting valve is closed and valve 2 is opened while taking boiler on range in Benson boiler? |
| A. | avoid excessive heating of tube |
| B. | to maintain the constant flow of water |
| C. | to avoid pressure built up in tubes |
| D. | to avoid pipe leakages at joints |
| Answer» A. avoid excessive heating of tube | |
| 188. |
What is the function of boiler? |
| A. | to burn the fuel in a confined closed system with the supply of air |
| B. | to generate steam at varying pressure |
| C. | to generate steam at constant pressure |
| D. | to produce flue gases by burning fuel at a given pressure |
| Answer» C. to generate steam at constant pressure | |
| 189. |
Why single boiler unit per turbine is equipped commonly? |
| A. | for better turbine control |
| B. | to deduce the costs |
| C. | for overcoming losses of power |
| D. | to improve the efficiency |
| Answer» A. for better turbine control | |
| 190. |
How can be the plant efficiency of steam power plant is increased? |
| A. | by using high pressure and high temperature steam |
| B. | by equipping ash and flue gas clearance system |
| C. | by maintaining the boiler on daily basis by cleaning the soot and combustion products |
| D. | by using better and efficient type of fuel for combustion |
| Answer» A. by using high pressure and high temperature steam | |
| 191. |
What is the temperature at which the steam boilers are capable to withstand? |
| A. | 200oc |
| B. | 280oc |
| C. | 540oc |
| D. | 358oc |
| Answer» C. 540oc | |
| 192. |
What is needed to be increased to increase the heat transfer rate in the boiler? |
| A. | gas velocities |
| B. | fuel input |
| C. | water velocities |
| D. | air supply |
| Answer» C. water velocities | |
| 193. |
In what is water in high pressure boiler circulated through? |
| A. | conduits |
| B. | cove |
| C. | channel |
| D. | tubes |
| Answer» D. tubes | |
| 194. |
Where is water steam separator drum located in Lamont boiler? |
| A. | inside of the boiler |
| B. | right above the furnace |
| C. | before the feed water pump |
| D. | outside of boiler |
| Answer» D. outside of boiler | |
| 195. |
Which of the given boilers velocity of flue gases is greater than velocity of sound? |
| A. | benson boiler |
| B. | la-mont boiler |
| C. | schmidt-hartmann boiler |
| D. | velox boiler |
| Answer» D. velox boiler | |
| 196. |
Which boiler is most successful boiler in the gas turbine industries? |
| A. | because it has greater flexibility |
| B. | it is easy to control, it’s fully automatic |
| C. | it has higher thermal efficiency of all |
| D. | can increase heat transfer without changing its size |
| Answer» D. can increase heat transfer without changing its size | |
| 197. |
What type of boiler is a Velox boiler? |
| A. | forced circulation boiler |
| B. | natural circulation boiler |
| C. | positively forced circulation boiler |
| D. | once- through boiler |
| Answer» A. forced circulation boiler | |
| 198. |
What is used to heat the feed water which is used for recirculation through tubes? |
| A. | condenser |
| B. | pre-heater |
| C. | economizer |
| D. | water clarifier |
| Answer» C. economizer | |
| 199. |
How many circuits are there in the Schmidt-Hartmann boiler? |
| A. | 3 |
| B. | 2 |
| C. | 4 |
| D. | 6 |
| Answer» B. 2 | |
| 200. |
Which type of circulation is incurred in Schmidt-Hartmann boiler? |
| A. | natural circulation |
| B. | positive forced circulation |
| C. | forced circulation |
| D. | once-through circulation |
| Answer» A. natural circulation | |
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