McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 151. |
Which are the major types of boilers that are operated in world today? |
| A. | natural circulation boiler |
| B. | forced circulation boiler |
| C. | fire tube boiler |
| D. | once through boiler |
| Answer» D. once through boiler | |
| 152. |
Cost of nuclear fuel in nuclear power plant economics is considered as |
| A. | running cost |
| B. | maintenance cost |
| C. | capital cost |
| D. | development cost |
| Answer» C. capital cost | |
| 153. |
In economics of nuclear power plant taxes and insurance charges are taken as |
| A. | operating cost |
| B. | maintenance cost |
| C. | capital cost |
| D. | fixed cost |
| Answer» D. fixed cost | |
| 154. |
The land area required for installation of nuclear power plant is |
| A. | more than thermal power plant |
| B. | less than thermal power plant |
| C. | equel to thermal power plant |
| D. | depends on type of construction |
| Answer» C. equel to thermal power plant | |
| 155. |
5 FUEL AND ASH HANDLING |
| A. | coal ash produced destroys the machinery by entering into them |
| B. | coal ash produced annually accounts for thousands of tones |
| C. | coal ash can be reutilized for some other purpose |
| D. | coal ash affects the health of people working at plants |
| Answer» B. coal ash produced annually accounts for thousands of tones | |
| 156. |
Which system consumes less power out of all ash handling systems? |
| A. | mechanical ash handling system |
| B. | pneumatic ash handling system |
| C. | hydraulic ash handling system |
| D. | steam jet ash handling system |
| Answer» A. mechanical ash handling system | |
| 157. |
Natural draught produced by a chimney depends upon |
| A. | density of chimney gases |
| B. | height of chimney |
| C. | both ‘density of chimney gases’ and ‘height of chimney’ |
| D. | none of the mentioned |
| Answer» C. both ‘density of chimney gases’ and ‘height of chimney’ | |
| 158. |
In a furnace employing forced draught compared to induced draught |
| A. | the fan operates hot and hence blades are liable to corrosion and erosion |
| B. | positive pressure exists in the furnace |
| C. | air is sucked in, so air leaks are more and hence furnace efficiency is reduced |
| D. | none of the mentioned |
| Answer» C. air is sucked in, so air leaks are more and hence furnace efficiency is reduced | |
| 159. |
Which of the following is not a reason of heating feed water? |
| A. | it improves overall efficiency |
| B. | it removes dissolved impurities |
| C. | it prevents from thermal stress which may cause due to enter of cold water into boiler |
| D. | it produces steam from feed water |
| Answer» D. it produces steam from feed water | |
| 160. |
Mechanical method of water treatment is done to |
| A. | heat the feed water |
| B. | to remove solid matter and impurities |
| C. | to add some solid materials |
| D. | to remove dissolved gases |
| Answer» B. to remove solid matter and impurities | |
| 161. |
Heat treatment arrangement used to separate or remove deserved gases and impurities from feed water is called the year later. |
| A. | true |
| B. | false |
| Answer» A. true | |
| 162. |
Having two separate units for process heat and power is? |
| A. | useful |
| B. | useless |
| C. | pollution reducing |
| D. | none of the mentioned |
| Answer» B. useless | |
| 163. |
In a back pressure turbine |
| A. | pressure at the exhaust from the turbine is the saturation pressure corresponding to the temperature desired in the process |
| B. | pressure at the entrance of the turbine is the saturation pressure corresponding to the temperature desired in the process |
| C. | pressure at the exhaust from the turbine is the saturation pressure corresponding to the pressure desired in the process |
| D. | none of the mentioned |
| Answer» A. pressure at the exhaust from the turbine is the saturation pressure corresponding to the temperature desired in the process | |
| 164. |
The cogeneration plant efficiency nCO if WT, Qi, QH represents turbine work, heat input, heat output respectively is given by? |
| A. | nco = (wt + qi) / qh |
| B. | nco = (wt – qi) / qh |
| C. | nco = (wt + qh) / qi |
| D. | nco = (wt + qh) / qi |
| Answer» D. nco = (wt + qh) / qi | |
| 165. |
Pass-out turbines are used in which of these cases? |
| A. | relatively high back pressure |
| B. | small heating requirement |
| C. | only relatively low back pressure |
| D. | both relatively high back pressure and small heating requirement |
| Answer» D. both relatively high back pressure and small heating requirement | |
| 166. |
Which of these is a working fluid in the topping plant of a Brayton-Rankine combined plant? |
| A. | hydrogen |
| B. | helium |
| C. | nitrogen |
| D. | all of the mentioned |
| Answer» B. helium | |
| 167. |
To improve the efficiency of the gas turbines, which among these are used? |
| A. | regenerator |
| B. | inter cooling |
| C. | reheating |
| D. | all of the mentioned |
| Answer» D. all of the mentioned | |
| 168. |
Which material is used for the manufacture of the turbine blades? |
| A. | stainless steel |
| B. | carbon steel |
| C. | high nickel alloy |
| D. | high alloy steel |
| Answer» C. high nickel alloy | |
| 169. |
Which of the following is a type of Gas Turbine Plant? |
| A. | single acting |
| B. | double acting |
| C. | open |
| D. | none of the mentioned |
| Answer» C. open | |
| 170. |
Which among these is the main component of a gas turbine plant? |
| A. | condenser |
| B. | compressor |
| C. | boiler |
| D. | both compressor & boiler |
| Answer» B. compressor | |
| 171. |
The maximum steam temperature in a power cycle in degree centigrade is? |
| A. | 600 |
| B. | 500 |
| C. | 300 |
| D. | 100 |
| Answer» A. 600 | |
| 172. |
By superposing a high temperature power plant as a topping unit to the steam plant, the energy conversion efficiency achieved is? |
| A. | higher |
| B. | lower |
| C. | maximum |
| D. | minimum |
| Answer» A. higher | |
| 173. |
Which of these is not a merit of nuclear power? |
| A. | amount of fuel required is small |
| B. | plant requires a huge amount of area |
| C. | demand for coal and oil is reduced |
| D. | most economical in large quantities |
| Answer» B. plant requires a huge amount of area | |
| 174. |
The thermionic generator is essentially which kind of device? |
| A. | low voltage & high current |
| B. | high voltage & high current |
| C. | low voltage & low current |
| D. | high voltage and high current |
| Answer» A. low voltage & high current | |
| 175. |
In an electron beam, the average kinetic energy of an electron is given by |
| A. | 2kt |
| B. | 3kt |
| C. | 1.5kt |
| D. | 2.5kt |
| Answer» A. 2kt | |
| 176. |
PWR stands for |
| A. | power |
| B. | partially weathered rock |
| C. | pressurized water reactor |
| D. | packaging waste regulations |
| Answer» C. pressurized water reactor | |
| 177. |
Select the incorrect statement which supports PWR. |
| A. | water is used as coolant |
| B. | pwr is stable in operation |
| C. | uses natural fuel |
| D. | pwr has positive power demand coefficient |
| Answer» C. uses natural fuel | |
| 178. |
LWR stands for |
| A. | lower water reactor |
| B. | line water reactor |
| C. | liquefied water reactor |
| D. | light water reactor |
| Answer» D. light water reactor | |
| 179. |
In which of the Following reactor is heavy hydrogen isotope H-2 is used as moderator? |
| A. | boiling water reactor |
| B. | pressurized water reactor |
| C. | candu reactor |
| D. | thermal reactor |
| Answer» C. candu reactor | |
| 180. |
CANDU stands for |
| A. | canadian natural darmstadtium uranium |
| B. | canadian natural deuterium uranium |
| C. | canadian natural dubnium uranium |
| D. | canadian natural dysprosium uranium |
| Answer» B. canadian natural deuterium uranium | |
| 181. |
GCFBR stands for |
| A. | gas conditioned fast breeder reactor |
| B. | gas cooled fast breeder reactor |
| C. | gas conditioned fast boiling reactor |
| D. | gas cooled fast breeder reactor |
| Answer» B. gas cooled fast breeder reactor | |
| 182. |
The mass number of an element is not changed, when it emits radiations. |
| A. | α & γ |
| B. | α, β, & γ |
| C. | α & β |
| D. | β & γ |
| Answer» D. β & γ | |
| 183. |
Which is the most commonly used molten metal for cooling of nuclear reactors? |
| A. | zinc |
| B. | sulphur |
| C. | sodium |
| D. | manganese |
| Answer» C. sodium | |
| 184. |
Fast breeder reactors do not |
| A. | use molten sodium as coolant |
| B. | use fast neutrons for fission |
| C. | use th-232 as fissile fuel |
| D. | convert fertile material to fissile material |
| Answer» C. use th-232 as fissile fuel | |
| 185. |
A boiling water reactor is the one, in which the |
| A. | pressurised water is pumped into the core. |
| B. | coolant water, after being heated in the reactor core, generates steam in a boiler |
| C. | fuel and the coolant are thoroughly mixed to form a homogeneous solution |
| D. | coolant water is allowed to boil in the core of the reactor |
| Answer» D. coolant water is allowed to boil in the core of the reactor | |
| 186. |
Thermal shield is used in high powered nuclear reactors to |
| A. | absorb the fast neutrons |
| B. | protect the walls of the reactor from radiation damage |
| C. | slow down the secondary neutrons |
| D. | protect the fuel element from coming in contact with the coolant |
| Answer» B. protect the walls of the reactor from radiation damage | |
| 187. |
Where was the first use of nuclear bombs which cause death to the millions of lives? |
| A. | karachi |
| B. | melbourne and sydney |
| C. | hiroshima and nagasaki |
| D. | tokyo |
| Answer» C. hiroshima and nagasaki | |
| 188. |
Who made the famous “Atoms for Peace” speech? |
| A. | abraham lincoln |
| B. | jawaharlal nehru |
| C. | dwight d eisenhower |
| D. | parker chewier |
| Answer» C. dwight d eisenhower | |
| 189. |
How many percentage of fissionable U-235 occurring in uranium? |
| A. | 0.1% |
| B. | 0.5% |
| C. | 0.7% |
| D. | 1.5% |
| Answer» C. 0.7% | |
| 190. |
Which is the main source of nuclear radiations? |
| A. | nuclear power plant |
| B. | sunlight |
| C. | atmospheric air |
| D. | volcanoes |
| Answer» A. nuclear power plant | |
| 191. |
Which element of hydroelectric power plant prevents the penstock from water hammer phenomenon? |
| A. | valves and gates |
| B. | draft tubes |
| C. | spillway |
| D. | surge tank |
| Answer» D. surge tank | |
| 192. |
Trash racks are built for |
| A. | discharging the water freely from the turbine exit to tailrace |
| B. | preventing the turbine from ingress of floating and other materials |
| C. | creating artificial head to store sufficient potential energy of water |
| D. | controlling the opening of valves |
| Answer» B. preventing the turbine from ingress of floating and other materials | |
| 193. |
The pressure at the inlet or exit of the draft tube should not be |
| A. | less than one third of atmospheric pressure |
| B. | greater than one third of atmospheric pressure |
| C. | less than one atmospheric pressure |
| D. | greater than one atmospheric pressure |
| Answer» A. less than one third of atmospheric pressure | |
| 194. |
Which statement about surge tank is wrong? |
| A. | ideal location of surge tank is at the turbine inlet |
| B. | a decrease in load demands cause a rise in water level in surge tank |
| C. | surge tanks are totally closed to avoid entry of unwanted objects to penstock |
| D. | surge tanks are installed to reduce harm effects of water hammer phenomenon |
| Answer» C. surge tanks are totally closed to avoid entry of unwanted objects to penstock | |
| 195. |
Trash racks are located |
| A. | near tailrace |
| B. | at the entrance of turbine |
| C. | inside penstock |
| D. | intake |
| Answer» D. intake | |
| 196. |
How many kinds of Geo thermal steams are there? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» A. 2 | |
| 197. |
A geothermal solution containing appreciable amounts of sodium chloride or other salts is called as |
| A. | fluids |
| B. | brine |
| C. | solvent |
| D. | magma |
| Answer» B. brine | |
| 198. |
A spring that shoots jets of hot water and steam into the air is called as |
| A. | mine hole |
| B. | geyser |
| C. | hot spring |
| D. | mud pot |
| Answer» B. geyser | |
| 199. |
What is the advantage of sectionalizing of power plant? |
| A. | high reliability |
| B. | low capital cost |
| C. | low maintenance |
| D. | easy operation |
| Answer» A. high reliability | |
| 200. |
Load duration curve indicates |
| A. | the variation of load during different hours of the day |
| B. | total number of units generated for the given demand |
| C. | total energy consumed by the load |
| D. | the number of hours for which the particular load lasts during a day |
| Answer» D. the number of hours for which the particular load lasts during a day | |
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