MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 463 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
In the mercury steam cycle, the mercury cycle is called? |
| A. | bottoming cycle |
| B. | middle cycle |
| C. | topping cycle |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 152. |
The mercury steam cycle represents how many coupled Rankine cycles? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 153. |
By using combined cycle steam and gas power plant _________ |
| A. | specific fuel consumption can be decreased |
| B. | efficiency increased |
| C. | specific fuel consumption can be decreased and efficiency increased |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 154. |
Combination of two or more thermodynamic processes gives _________ |
| A. | decrease in efficiency |
| B. | increase in efficiency |
| C. | increases the temperature at exhaust |
| D. | none of the mentioned |
| Answer» C. increases the temperature at exhaust | |
| 155. |
What are turbo-compound engines? |
| A. | turbines run at exhausts of otto and diesel cycles |
| B. | combination of turbofan and turbojet engines |
| C. | combination of turboprop and turbofan engines |
| D. | none of the mentioned |
| Answer» B. combination of turbofan and turbojet engines | |
| 156. |
Turbines that are run by exhaust gases are called _______ |
| A. | power recovery turbines |
| B. | stepped turbines |
| C. | turbo compounded engine |
| D. | none of the mentioned |
| Answer» B. stepped turbines | |
| 157. |
5. How many sections does waste heat recovery boiler have in steam generators? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 158. |
. Due to the limits, upper efficiency of steam turbines is fixed to _________ |
| A. | 10-15% |
| B. | 25-45% |
| C. | 20-40% |
| D. | 35-45% |
| Answer» E. | |
| 159. |
Which of the following waste types are not suitable for co-combustion in cement kilns? |
| A. | chlorine |
| B. | hydrogen |
| C. | calcium |
| D. | carbonate |
| Answer» B. hydrogen | |
| 160. |
Non-volatile heavy metals in kiln are fixed into __________ |
| A. | clinker’s crystalline structure |
| B. | fumes |
| C. | solid lump |
| D. | slag |
| Answer» B. fumes | |
| 161. |
What is the combustion temperature range in cement kiln incineration? |
| A. | 1300-1600 |
| B. | 1350-1650 |
| C. | 1250-1450 |
| D. | 1235-1600 |
| Answer» C. 1250-1450 | |
| 162. |
Which of the following industrial process uses waste as a fuel? |
| A. | cement kilns |
| B. | lead manufacturing |
| C. | acid manufacturing |
| D. | sulphur manufacturing |
| Answer» B. lead manufacturing | |
| 163. |
Energy recovery is typically via production of __________ |
| A. | gas |
| B. | heat |
| C. | light |
| D. | steam |
| Answer» E. | |
| 164. |
The engines which are operating on gas power cycle are? |
| A. | cyclic |
| B. | non-cyclic |
| C. | either cyclic or non-cyclic |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 165. |
What is the importance of the freezing point of the working fluid in the vapour power cycle? |
| A. | freezing point of working fluid should be below the room temperature |
| B. | freezing point of working fluid should be above the room temperature |
| C. | freezing point of working fluid should be equal to the room temperature |
| D. | does not have any importance |
| Answer» B. freezing point of working fluid should be above the room temperature | |
| 166. |
What is the specific heat of the ideal working fluid used in vapour power cycle? |
| A. | should be constant |
| B. | should be large |
| C. | should be small |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 167. |
Temperature of heat rejection in a condenser can be lowered by using? |
| A. | lubricant |
| B. | oil |
| C. | refrigerant |
| D. | diesel |
| Answer» D. diesel | |
| 168. |
The use of which of the following becomes necessary during expansion of steam? |
| A. | reheat |
| B. | regeneration |
| C. | refrigeration |
| D. | superheat |
| Answer» B. regeneration | |
| 169. |
What is the relation of the mean temperature of heat addition and cycle efficiency? |
| A. | both are inversely proportional |
| B. | both are directly proportional |
| C. | both are independent of each other |
| D. | none of the mentioned |
| Answer» C. both are independent of each other | |
| 170. |
High moisture content is involved during expansion of steam because ___________ |
| A. | to ensure uniform heating |
| B. | to ensure uniform cooling |
| C. | to obtain a higher temperature of heat addition |
| D. | to obtain a lower temperature of heat addition |
| Answer» D. to obtain a lower temperature of heat addition | |
| 171. |
Addition of an infinitesimal amount of heat at the highest temperature is because ___________ |
| A. | to initiate reheating |
| B. | to initiate regeneration |
| C. | to initiate superheating |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 172. |
Back pressure turbine is placed between ____________ |
| A. | turbine & pump |
| B. | boiler & pump |
| C. | turbine & heat exchanger |
| D. | boiler & turbine |
| Answer» E. | |
| 173. |
In condensing turbine what is the back pressure of the turbine? |
| A. | very high |
| B. | above atmospheric pressure |
| C. | equal to atmospheric pressure |
| D. | below atmospheric pressure |
| Answer» E. | |
| 174. |
Reaction turbines are characterized by ___________ |
| A. | relatively low rpm and steam expension over nozzle |
| B. | relatively high rpm and steam expension over nozzle |
| C. | relatively low rpm and steam expension over rotor blades |
| D. | relatively high rpm and steam expansion over rotor blades |
| Answer» D. relatively high rpm and steam expansion over rotor blades | |
| 175. |
Which statement about reaction turbine is false? |
| A. | steam does not expand in nozzle |
| B. | blades acts like nozzles |
| C. | steam expands as flows over the rotor blades |
| D. | steam continuously losses its heat as flows over the rotor blades |
| Answer» E. | |
| 176. |
Having two separate units for process heat and power is? |
| A. | useful |
| B. | useless |
| C. | pollution reducing |
| D. | none of the mentioned |
| Answer» C. pollution reducing | |
| 177. |
Superficial steam turbines releases _______ CO2. |
| A. | high |
| B. | low |
| C. | does not release |
| D. | none of the mentioned |
| Answer» B. low | |
| 178. |
Superficial steam turbines can be operated at ________ |
| A. | medium speeds |
| B. | low speeds |
| C. | high speeds |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 179. |
Energy efficiency of superficial steam is _________ |
| A. | low |
| B. | high |
| C. | same as other steams |
| D. | none of the mentioned |
| Answer» C. same as other steams | |
| 180. |
Superficial steam power plants operate at _____ temperatures. |
| A. | high |
| B. | low |
| C. | constant |
| D. | none of the mentioned |
| Answer» B. low | |
| 181. |
Steam turbines used in nuclear reactors use __________ |
| A. | superficial fluids |
| B. | high pressure steam |
| C. | specific heat |
| D. | none of the mentioned |
| Answer» B. high pressure steam | |
| 182. |
When steam pressure ________ it becomes superficial fluid. |
| A. | decreases |
| B. | increases |
| C. | steam can not become superficial fluid |
| D. | none of the mentioned |
| Answer» C. steam can not become superficial fluid | |
| 183. |
_______ of electricity in United States is produced using steam turbine. |
| A. | 88% |
| B. | 50% |
| C. | 100% |
| D. | 77% |
| Answer» B. 50% | |
| 184. |
A steam turbine with no nozzle is? |
| A. | reaction turbine |
| B. | impulse turbine |
| C. | reaction & impulse turbines |
| D. | none of the mentioned |
| Answer» B. impulse turbine | |
| 185. |
Steam turbines may be classified according to ____________ |
| A. | number of stages |
| B. | direction of steam flow |
| C. | mode of steam action |
| D. | all of the mentioned |
| Answer» E. | |
| 186. |
If the critical pressure ratio for steam is 0.546, then the steam is initially ____________ |
| A. | wet |
| B. | dry saturated |
| C. | superheated |
| D. | none of the mentioned |
| Answer» D. none of the mentioned | |
| 187. |
A steam nozzle converts ____________ |
| A. | heat energy of steam into potential energy |
| B. | potential energy into heat energy of steam |
| C. | heat energy of steam into kinetic energy |
| D. | kinetic energy into heat energy of steam |
| Answer» D. kinetic energy into heat energy of steam | |
| 188. |
A stage, in reaction turbine, is represented by ____________ |
| A. | each row of blades |
| B. | number of entries of steam |
| C. | number of exits of steam |
| D. | none of the mentioned |
| Answer» B. number of entries of steam | |
| 189. |
In an impulse turbine, steam expands ____________ |
| A. | wholly in nozzle |
| B. | partly in the nozzle and partly in blades |
| C. | wholly in blades |
| D. | none of the mentioned |
| Answer» B. partly in the nozzle and partly in blades | |
| 190. |
The reheat factor depends upon ____________ |
| A. | exit pressure |
| B. | turbine stage efficiency |
| C. | initial pressure and superheat |
| D. | all of the mentioned |
| Answer» E. | |
| 191. |
The ratio of the isentropic heat drop to the heat supplied is called ____________ |
| A. | stage efficiency |
| B. | reheat factor |
| C. | internal efficiency |
| D. | rankine efficiency |
| Answer» E. | |
| 192. |
What is the critical pressure ratio for initially dry saturated steam? |
| A. | 0.546 |
| B. | 0.577 |
| C. | 0.586 |
| D. | 0.578 |
| Answer» C. 0.586 | |
| 193. |
In a reaction turbine, when steam flows through the fixed blades ____________ |
| A. | pressure decreases while velocity increases |
| B. | pressure increases while velocity decreases |
| C. | pressure and velocity both increases |
| D. | pressure and velocity both decreases |
| Answer» B. pressure increases while velocity decreases | |
| 194. |
What is the purpose of governing in steam turbines? |
| A. | reheat the steam and improve its quality |
| B. | maintain the speed of the turbine |
| C. | reduce the effective heat drop |
| D. | completely balance against end thrust |
| Answer» C. reduce the effective heat drop | |
| 195. |
Curtis turbine is a ____________ |
| A. | pressure compounded turbine |
| B. | velocity compounded turbine |
| C. | simple reaction turbine |
| D. | pressure-velocity compounded turbine |
| Answer» E. | |
| 196. |
A binary vapour plant consists of ____________ |
| A. | mercury boiler |
| B. | steam turbine |
| C. | steam condenser |
| D. | all of the mentioned |
| Answer» E. | |
| 197. |
Steam turbines are used for ____________ |
| A. | electric power generation |
| B. | large marine propulsion |
| C. | direct drive of fans, compressors, pumps |
| D. | all of the mentioned |
| Answer» E. | |
| 198. |
The steam enters the nozzle at a ____________ |
| A. | low pressure and a low velocity |
| B. | high pressure and a low velocity |
| C. | low pressure and a high velocity |
| D. | high pressure and a high velocity |
| Answer» E. | |
| 199. |
The variation of steam pressure in the nozzle depends upon ____________ |
| A. | dryness fraction of steam |
| B. | specific volume of steam |
| C. | velocity of steam |
| D. | all of the mentioned |
| Answer» E. | |
| 200. |
The flow of steam is super-sonic ____________ |
| A. | in the convergent portion of the nozzle |
| B. | at the entrance to the nozzle |
| C. | at the throat of the nozzle |
| D. | in the divergent portion of the nozzle |
| Answer» E. | |