MCQOPTIONS
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MCQOPTIONS
This section includes 317 Mcqs, each offering curated multiple-choice questions to sharpen your ENGINEERING SERVICES EXAMINATION (ESE) knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
Belt conveyer can be used to transport coal at inclinations upto |
| A. | 30° |
| B. | 60° |
| C. | 80° |
| D. | 90° |
| Answer» B. 60° | |
| 202. |
India's first nuclear power plant was installed at |
| A. | Tarapore |
| B. | kota |
| C. | Kalpakkam |
| D. | none of the above |
| Answer» B. kota | |
| 203. |
Steam turbines commonly used in steam power station are |
| A. | condensing type |
| B. | non-condensing type |
| C. | both (A) and (B) |
| D. | none of the above |
| Answer» B. non-condensing type | |
| 204. |
Primary air is that air which is used to |
| A. | reduce the flame length |
| B. | increase the flame length |
| C. | transport and dry the coal |
| D. | provide air around burners for getting optimum combustion |
| Answer» D. provide air around burners for getting optimum combustion | |
| 205. |
Incase of reaction steam turbine |
| A. | there is enthalpy drop both in fixed and moving blades |
| B. | there is enthalpy drop only in fixed blades |
| C. | there is enthalpy drop only in moving blades |
| D. | none of the above |
| Answer» B. there is enthalpy drop only in fixed blades | |
| 206. |
Reheat factor in steam turbines depends on |
| A. | exit pressure only |
| B. | stage efficiency only |
| C. | initial pressures and temperature only |
| D. | all of the above |
| Answer» D. all of the above | |
| 207. |
Evaporative type of condenser has |
| A. | steam in pipes surrounded by water |
| B. | water in pipes surrounded by steam |
| C. | either (A) or (B) |
| D. | none of the above |
| Answer» B. water in pipes surrounded by steam | |
| 208. |
The draught which a chimney produces is called |
| A. | induced draught |
| B. | natural draught |
| C. | forced draught |
| D. | balanced draught |
| Answer» C. forced draught | |
| 209. |
The efficiency of a modern boiler using coal and heat recovery equipment is about |
| A. | 25 to 30% |
| B. | 40 to 50% |
| C. | 65 to 70% |
| D. | 85 to 90% |
| Answer» E. | |
| 210. |
For the induced draught the fan is located |
| A. | near bottom of chimney |
| B. | near bottom of furnace |
| C. | at the top of the chimney |
| D. | anywhere permissible |
| Answer» B. near bottom of furnace | |
| 211. |
Carnot cycle comprises of |
| A. | two isentropic processes and two constant volume processes |
| B. | two isentropic processes and two constant pressure processes |
| C. | two isothermal processes and three constant pressure processes |
| D. | none of the above |
| Answer» C. two isothermal processes and three constant pressure processes | |
| 212. |
The effect of considering friction in steam nozzles for the same pressure ratio leads to |
| A. | increase in dryness fraction of exit steam |
| B. | decrease in dryness fraction of exit steam |
| C. | no change in the quality of exit steam |
| D. | decrease or increase of dryness fraction of exit steam depending upon inlet quality |
| Answer» B. decrease in dryness fraction of exit steam | |
| 213. |
The effect of considering friction losses in steam nozzle for the same pressure ratio leads to |
| A. | increase in exit velocity from the nozzle |
| B. | decrease in exit velocity from the nozzle |
| C. | no change in exit velocity from the nozzle |
| D. | increase or decrease depending upon the exit quality of steam |
| Answer» C. no change in exit velocity from the nozzle | |
| 214. |
Method which is commonly applied for unloading the coal for small power plant is |
| A. | lift trucks |
| B. | coal accelerators |
| C. | tower cranes |
| D. | belt conveyor |
| Answer» C. tower cranes | |
| 215. |
In Rankine cycle the work output from the turbine is given by |
| A. | change of internal energy between inlet and outlet |
| B. | change of enthaply between inlet and outlet |
| C. | change of entropy between inlet and outlet |
| D. | change of temperature between inlet and outlet |
| Answer» C. change of entropy between inlet and outlet | |
| 216. |
Compounding of steam turbine is done for |
| A. | reducing the work done |
| B. | increasing the rotor speed |
| C. | reducing the rotor speed |
| D. | balancing the turbine |
| Answer» D. balancing the turbine | |
| 217. |
In ______ system fuel from a central pulverizing unit is delivered to a bunker and then to the various burners |
| A. | unit |
| B. | central |
| C. | power |
| D. | none of the above |
| Answer» C. power | |
| 218. |
The draught produced by chimney of given height at given outside temperature |
| A. | decreases if the chimney gas temperature increases |
| B. | increases if the chimney gas temperature increases |
| C. | remains same irrespective of chimney gas temperature |
| D. | may increase or decrease |
| Answer» C. remains same irrespective of chimney gas temperature | |
| 219. |
In De Laval steam turbine |
| A. | the pressure in the turbine rotor is approximately same as in condenser |
| B. | the pressure in the turbine rotor is higher than pressure in the condenser |
| C. | the pressure in the turbine rotor gradually decreases from inlet to exit from condenser |
| D. | none from the above |
| Answer» B. the pressure in the turbine rotor is higher than pressure in the condenser | |
| 220. |
Rankine cycle efficiency of a good steam power plant may be in the range of |
| A. | 15 to 20 per cent |
| B. | 35 to 45 per cent |
| C. | 70 to 80 per cent |
| D. | 90 to 95 per ceut |
| Answer» C. 70 to 80 per cent | |
| 221. |
The isentropic expansion of steam through nozzle for the steam initially dry saturated at inlet is approximated by equation. |
| A. | pv = C |
| B. | pv1A = C |
| C. | pv1i = C |
| D. | pv |
| Answer» E. | |
| 222. |
Underfeed stokers work best for __________ coals high in volatile matter and with caking tendency |
| A. | Anthracite |
| B. | Lignite |
| C. | Semi-bituminous and bituminous |
| D. | All of the above |
| Answer» D. All of the above | |
| 223. |
Reheat cycle in steam power plant is used to |
| A. | utilise heat of flue gases |
| B. | increase thermal efficiency |
| C. | improve condenser performance |
| D. | reduce loss of heat |
| Answer» C. improve condenser performance | |
| 224. |
Blowing down of boiler water is the process |
| A. | to reduce the boiler pressure |
| B. | to increase the steam temperature |
| C. | to control the solid concentration in the boiler water by removing some of the concentrated saline water |
| D. | none of the above |
| Answer» D. none of the above | |
| 225. |
In a regenerative surface condenser |
| A. | There is one pump to remove air and condensate |
| B. | There are two pumps to remove air and condensate |
| C. | There are three pumps to remove air, vapor and condensate |
| D. | There is no pump; the condensate gets removed by gravity |
| Answer» C. There are three pumps to remove air, vapor and condensate | |
| 226. |
The draught produced, for a given height of the chimney and given mean temperature of chimney gases |
| A. | decreases with increase in outside air temperature |
| B. | increases with increase in outside air temperature |
| C. | remains the same irrespective of outside air temperature |
| D. | may increase or decrease with increase in outside air temperature |
| Answer» B. increases with increase in outside air temperature | |
| 227. |
For the safety of a steam boiler the number of safety valves fitted are |
| A. | four |
| B. | three |
| C. | two |
| D. | one |
| Answer» D. one | |
| 228. |
In a regenerative feed heating cycle, the optimum value of the fraction of steam extracted for feed heating |
| A. | Decreases with increase in Rankine cycle efficiency |
| B. | Increases with increase in Rankine cycle efficiency |
| C. | Is unaffected by increase in Rankine cycle efficiency |
| D. | None of the above |
| Answer» C. Is unaffected by increase in Rankine cycle efficiency | |
| 229. |
In India largest thermal power station is located at |
| A. | Kota |
| B. | Sarni |
| C. | Chandrapur |
| D. | Neyveli |
| Answer» D. Neyveli | |
| 230. |
The pressure at the furnace is minimum in case of |
| A. | forced draught system |
| B. | induced draught system |
| C. | balanced draught system |
| D. | natural draught system |
| Answer» D. natural draught system | |
| 231. |
Steam pressure in a steam power station, which is usually kept now-a-days is of the order of |
| A. | 20 kgf/cm² |
| B. | 50 kgf/cm² |
| C. | 80 kgf/cm² |
| D. | 100 kgf/cm² |
| Answer» E. | |
| 232. |
In coal preparation plant, magnetic separators are used to remove |
| A. | Dust |
| B. | Clinkers |
| C. | Iron particles |
| D. | Sand |
| Answer» D. Sand | |
| 233. |
Example of overfeed type stoker is |
| A. | chain grate |
| B. | spreader |
| C. | travelling grate |
| D. | all of the above |
| Answer» E. | |
| 234. |
The draught produced by steel chimney as compared to that produced by brick chimney for the same height is |
| A. | Less |
| B. | More |
| C. | Same |
| D. | May be more or less |
| Answer» C. Same | |
| 235. |
Secondary air is the air used to |
| A. | reduce the flame length |
| B. | increase the flame length |
| C. | transport and dry the coal |
| D. | provide air round the burners for getting optimum combustion |
| Answer» E. | |
| 236. |
The value of the reheat factor is of the order of |
| A. | 0.8 to 1.0 |
| B. | 1.0 to 1.05 |
| C. | 1.1 to 1.5 |
| D. | above 1.5 |
| Answer» D. above 1.5 | |
| 237. |
Binary vapor cycles are used to |
| A. | Increase the performance of the condenser |
| B. | Increase the efficiency of the plant |
| C. | Increase efficiency of the turbine |
| D. | None of the above |
| Answer» C. Increase efficiency of the turbine | |
| 238. |
Rankine cycle operating on low pressure limit of p1 and high pressure limit of p2 |
| A. | Has higher thermal efficiency than the Carnot cycle operating between same pressure limits |
| B. | Has lower thermal efficiency than Carnot cycle operating between same pressure limit |
| C. | Has same thermal efficiency as Carnot cycle operating between same pressure limits |
| D. | May be more or less depending upon the magnitude of p1 and p2 |
| Answer» B. Has lower thermal efficiency than Carnot cycle operating between same pressure limit | |
| 239. |
Parson's turbine is |
| A. | pressure compounded steam turbine |
| B. | simple single wheel, impulse steam turbine |
| C. | simple single wheel reaction steam turbine |
| D. | multi wheel reaction steam turbine |
| Answer» E. | |
| 240. |
TravelUng grate stoker can burn coals at the rates of |
| A. | 50 - 75 kg/m per hour |
| B. | 75 - 100 kg/m per hour |
| C. | 100— - kg/m per hour |
| D. | 150 - 200 kg/m² per hour |
| Answer» E. | |
| 241. |
Caking coals are those which |
| A. | burn completely |
| B. | burn freely |
| C. | do not form ash |
| D. | form lumps or masses of coke |
| Answer» E. | |
| 242. |
In fuel cell, the ______ energy is converted into electrical energy. |
| A. | mechanical |
| B. | chemical |
| C. | heat |
| D. | sound |
| Answer» C. heat | |
| 243. |
The critical pressure ratio of a convergent nozzle is defined as |
| A. | the ratio of outlet pressure to inlet pressure of nozzle |
| B. | the ratio of inlet pressure to outlet pressure of nozzle |
| C. | the ratio of outlet pressure to inlet pressure only when mass flow rate per unit area is min-imum |
| D. | the ratio of outlet pressure to inlet pressure only when mass flow rate = c |
| Answer» E. | |
| 244. |
The value of reheat factor normally varies from |
| A. | 0.5 to 0.6 |
| B. | 0.9 to 0.95 |
| C. | 1.02 to 1.06 |
| D. | 1.2 to 1.6 |
| Answer» D. 1.2 to 1.6 | |
| 245. |
The isentropic expansion of steam through nozzle for the steam initially superheated at inlet is approximated by equation |
| A. | pvls=C |
| B. | pv1126 = C |
| C. | pv1A = C |
| D. | pv = C |
| Answer» B. pv1126 = C | |
| 246. |
The commercial sources of energy are |
| A. | solar, wind and biomass |
| B. | fossil fuels, hydropower and nuclear energy |
| C. | wood, animal wastes and agriculture wastes |
| D. | none of the above |
| Answer» C. wood, animal wastes and agriculture wastes | |
| 247. |
For the same draught produced the power of induced draught fan as compared to forced draught fan is |
| A. | less |
| B. | more |
| C. | same |
| D. | not predictable |
| Answer» C. same | |
| 248. |
In a steam power plant, the function of a condenser is |
| A. | to maintain pressure below atmospheric to increase work output from the primemover |
| B. | to receive large volumes of steam exhausted from steam prime mover |
| C. | to condense large volumes of steam to water which may be used again in boiler |
| D. | all of the above |
| Answer» E. | |
| 249. |
For forced draught system, the function of chimney is mainly |
| A. | to produce draught to accelerate the combustion of fuel |
| B. | to discharge gases high up in the atmosphere to avoid hazard |
| C. | to reduce the temperature of the hot gases discharged |
| D. | none of the above |
| Answer» C. to reduce the temperature of the hot gases discharged | |
| 250. |
The efficiency of chimney is approximately |
| A. | 80% |
| B. | 40% |
| C. | 20% |
| D. | 0.25% |
| Answer» E. | |