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MCQOPTIONS
This section includes 564 Mcqs, each offering curated multiple-choice questions to sharpen your Automobile Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 201. |
Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler |
| A. | Increases |
| B. | Decreases |
| C. | Remain unaffected |
| D. | First increases and then decreases |
| Answer» C. Remain unaffected | |
| 202. |
The high pressure boiler is one, which produces steam at a pressure more than |
| A. | Atmospheric pressure |
| B. | 5 kg/cm² |
| C. | 10 kg/cm² |
| D. | 7580 kg/cm² |
| Answer» E. | |
| 203. |
The difference of supersaturated temperature and saturation temperature at that pressure is called |
| A. | Degree of super-saturation |
| B. | Degree of superheat |
| C. | Degree of under-cooling |
| D. | None of these |
| Answer» D. None of these | |
| 204. |
The saturation temperature of steam with increase in pressure increases |
| A. | Linearly |
| B. | Rapidly first and then slowly |
| C. | Slowly first and then rapidly |
| D. | Inversely |
| Answer» C. Slowly first and then rapidly | |
| 205. |
The specific volume of steam with increase in pressure decreases |
| A. | Linearly |
| B. | Slowly first and then rapidly |
| C. | Rapidly first and then slowly |
| D. | Inversely |
| Answer» D. Inversely | |
| 206. |
In a Woolf type compound engine, the high pressure and low pressure cylinders |
| A. | Have common piston rod |
| B. | Are set at 90° |
| C. | Have separate piston rod |
| D. | Are set in V arrangement |
| Answer» D. Are set in V arrangement | |
| 207. |
In a receiver type compound engine, the high pressure and low pressure cylinders |
| A. | Have common piston rod |
| B. | Are set at 90° |
| C. | Have separate piston rods |
| D. | Are set in V-arrangement |
| Answer» D. Are set in V-arrangement | |
| 208. |
In a Tandem type compound engine, the high pressure and low pressure cylinders |
| A. | Have common piston rod |
| B. | Are set at 90° |
| C. | Have separate piston rods |
| D. | Are set in V-arrangement |
| Answer» B. Are set at 90° | |
| 209. |
Water tube boilers are those in which |
| A. | Flue gases pass through tubes and water around it |
| B. | Water passes through the tubes and flue gases around it |
| C. | Work is done during adiabatic expansion |
| D. | Change in enthalpy |
| Answer» D. Change in enthalpy | |
| 210. |
Boilers, Engines, Nozzles and Turbines Objective Questions and Answers pdf:- 101. The difference between cornish boiler and lancashire boiler is that |
| A. | former is fire tube type and latter is water tube type boiler |
| B. | former is water tube type and latter is fire tube type |
| C. | former contains one fire tube and latter contains two fire tubes |
| D. | none of the above |
| Answer» D. none of the above | |
| 211. |
The difference between Cornish boiler and Lancashire boiler is that |
| A. | Former is fire tube type and latter is water tube type boiler |
| B. | Former is water tube type and latter is fire tube type |
| C. | Former contains one fire tube and latter contains two fire tubes |
| D. | None of the above |
| Answer» D. None of the above | |
| 212. |
Multi-stage steam turbines are of the |
| A. | Velocity compounded type |
| B. | Reaction type |
| C. | Pressure compounded type |
| D. | All of these |
| Answer» E. | |
| 213. |
The expansion of steam, as it flows over the blades in reaction turbine, represents |
| A. | Isothermal process |
| B. | Isentropic process |
| C. | Throttling process |
| D. | Free expansion process |
| Answer» C. Throttling process | |
| 214. |
In a compound steam engine, the first stage of expansion is carried out in a high pressure cylinder whereas the last expansion is completed in low pressure cylinder. The diameter of high pressure cylinder is _________ the low pressure cylinder. |
| A. | Equal to |
| B. | Less than |
| C. | More than |
| D. | None of these |
| Answer» C. More than | |
| 215. |
The latent heat of steam with increase of pressure |
| A. | Remain same |
| B. | Increases |
| C. | Decreases |
| D. | Behaves unpredictably |
| Answer» D. Behaves unpredictably | |
| 216. |
The increase in pressure |
| A. | Lowers the boiling point of a liquid |
| B. | Raises the boiling point of a liquid |
| C. | Does not affects the boiling point of a liquid |
| D. | Reduces its volume |
| Answer» C. Does not affects the boiling point of a liquid | |
| 217. |
Parson's reaction turbine is a __________ reaction turbine. |
| A. | 40 percent |
| B. | 50 percent |
| C. | 60 percent |
| D. | 70 percent |
| Answer» C. 60 percent | |
| 218. |
Fire tube boilers are those in which |
| A. | Flue gases pass through tubes and water around it |
| B. | Water passes through the tubes and flue gases around it |
| C. | Forced circulation takes place |
| D. | Tubes are laid vertically |
| Answer» B. Water passes through the tubes and flue gases around it | |
| 219. |
The effect of friction in the nozzle __________ dryness fraction of steam. |
| A. | Has no effect on |
| B. | Decreases |
| C. | Increases |
| D. | None of these |
| Answer» D. None of these | |
| 220. |
Equivalent evaporation of water is the evaporation for a feed water supply at 100°C |
| A. | And its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm² |
| B. | And its corresponding conversion into dry steam at desired boiler pressure |
| C. | Conversion into steam at atmospheric condition |
| D. | Conversion into steam at the same pressure at which feed water is supplied |
| Answer» B. And its corresponding conversion into dry steam at desired boiler pressure | |
| 221. |
It is required to produce large amount of steam at low pressure. Which boiler should be used? |
| A. | Pulverized fuel fired boiler |
| B. | Cochran boiler |
| C. | Lancashire boiler |
| D. | Babcock and Wilcox boiler |
| Answer» D. Babcock and Wilcox boiler | |
| 222. |
Evaporative capacity of boiler is expressed as |
| A. | kg of steam produced |
| B. | Steam pressure produced |
| C. | kg of fuel fired |
| D. | kg of steam produced per kg of fuel fifed |
| Answer» E. | |
| 223. |
Gusset stays in a boiler are provided to |
| A. | Prevent the bulging of flat surfaces |
| B. | Avoid explosion in furnace |
| C. | Prevent leakage of hot flue gases |
| D. | Support furnace freely from top |
| Answer» B. Avoid explosion in furnace | |
| 224. |
A vessel into which the steam is exhausted and condensed after doing work in an engine cylinder or turbine is known as |
| A. | Steam condenser |
| B. | Steam boiler |
| C. | Steam preheater |
| D. | Economiser |
| Answer» B. Steam boiler | |
| 225. |
Sulphur content of fuels is very important to the plant operators because it |
| A. | Has high heating value |
| B. | Retards electric precipitation |
| C. | Promotes complete combustion |
| D. | Has highly corrosive effect |
| Answer» E. | |
| 226. |
The size of a boiler drum in pulverized fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Increases/decreases depending on steam temperature requirements |
| Answer» C. Remains unchanged | |
| 227. |
The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced. |
| A. | Remains same |
| B. | Decreases |
| C. | Increases |
| D. | None of these |
| Answer» D. None of these | |
| 228. |
The ratio of the isentropic heat drop to the heat supplied, is called |
| A. | Reheat factor |
| B. | Stage efficiency |
| C. | Internal efficiency |
| D. | Rankine efficiency |
| Answer» E. | |
| 229. |
The ratio of brake power to the indicated power is known as |
| A. | Mechanical efficiency |
| B. | Overall efficiency |
| C. | Indicated thermal efficiency |
| D. | Brake thermal efficiency |
| Answer» B. Overall efficiency | |
| 230. |
A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is known as |
| A. | Superheater |
| B. | Air-preheater |
| C. | Economizer |
| D. | Injector |
| Answer» C. Economizer | |
| 231. |
The density of supersaturated steam is about __________ that of the ordinary saturated vapor at the corresponding pressure. |
| A. | Same as |
| B. | 2 times |
| C. | 4 times |
| D. | 8 times |
| Answer» E. | |
| 232. |
Feed water conditioning in thermal power plants in done to |
| A. | Reduce hardness and for removal of solids |
| B. | Increase efficiency of thermal power plant |
| C. | Increase heat transfer rate |
| D. | Increase steam parameters |
| Answer» B. Increase efficiency of thermal power plant | |
| 233. |
A binary vapor plant consists of |
| A. | Steam turbine |
| B. | Steam condenser |
| C. | Mercury boiler |
| D. | All of these |
| Answer» E. | |
| 234. |
Reheating of steam under ideal conditions takes place at constant |
| A. | Entropy |
| B. | Enthalpy |
| C. | Pressure |
| D. | Temperature |
| Answer» E. | |
| 235. |
The dry saturated steam at very high pressure (150200 kg/cm²) when throttled to atmosphere will become |
| A. | Wet |
| B. | Superheated |
| C. | Remain dry saturated |
| D. | Dry |
| Answer» B. Superheated | |
| 236. |
The dry saturated steam at very low pressure, (510 kg/cm²) when throttled to atmosphere will become |
| A. | Wet |
| B. | Superheated |
| C. | Remain dry saturated |
| D. | Dry |
| Answer» C. Remain dry saturated | |
| 237. |
The stage efficiency (ηS) is given by (where ηB = Blading efficiency, and ηN = Nozzle efficiency) |
| A. | ηS = ηB × ηN |
| B. | ηS = ηB / ηN |
| C. | ηS = ηN / ηB |
| D. | None of these |
| Answer» B. ηS = ηB / ηN | |
| 238. |
Lancashire boiler is used where working pressure and power required are |
| A. | Low |
| B. | Moderate |
| C. | High |
| D. | None of these |
| Answer» C. High | |
| 239. |
Throttle governing of steam engines is a method of controlling the engine output by varying |
| A. | Volume of intake steam |
| B. | Pressure of intake steam |
| C. | Temperature of intake steam |
| D. | All of these |
| Answer» C. Temperature of intake steam | |
| 240. |
Locomotive boiler is a |
| A. | Single tube, horizontal, internally fired and stationary boiler |
| B. | Single tube, vertical, externally fired and stationary boiler |
| C. | Multi-tubular, horizontal, internally fired and mobile boiler |
| D. | Multi-tubular, horizontal, externally fired and stationary boiler |
| Answer» D. Multi-tubular, horizontal, externally fired and stationary boiler | |
| 241. |
Heating value of fuel used is as on fired basis. If it is reported for dry or moisture free fuel, then latter should be multiplied by the following factor to correct for as fired value |
| A. | (1- moisture content) |
| B. | (1 + moisture content) |
| C. | 1 + moisture content |
| D. | 1 – moisture content |
| Answer» B. (1 + moisture content) | |
| 242. |
The efficiency of a pressure-velocity compounded impulse turbine is __________ as compared to pressure compounded impulse turbine. |
| A. | Same |
| B. | Less |
| C. | More |
| D. | None of these |
| Answer» C. More | |
| 243. |
The relative heat absorption for successively added equal areas of boiler convection heating surfaces |
| A. | Increases |
| B. | Decreases |
| C. | Remain unaffected |
| D. | First increases and then decreases |
| Answer» C. Remain unaffected | |
| 244. |
The fittings mounted on the boiler for its proper and safe functioning is a |
| A. | Water level indicator |
| B. | Pressure gauge |
| C. | Safety valve |
| D. | All of these |
| Answer» E. | |
| 245. |
Pulverized fuel is used for |
| A. | Better burning |
| B. | More calorific value |
| C. | Less radiation loss |
| D. | Medium sized units |
| Answer» B. More calorific value | |
| 246. |
In forced circulation steam boilers, the force is applied |
| A. | To draw water |
| B. | To circulate water |
| C. | To drain off the water |
| D. | All of these |
| Answer» C. To drain off the water | |
| 247. |
When the cross-section of a nozzle __________ continuously from entrance to exit, it is called a convergent nozzle. |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | None of these |
| Answer» C. Remain same | |
| 248. |
Parson's turbine is a |
| A. | Simple impulse turbine |
| B. | Simple reaction turbine |
| C. | Impulse-reaction turbine |
| D. | None of these |
| Answer» C. Impulse-reaction turbine | |
| 249. |
Pick up the wrong statement about critical condition of steam |
| A. | Latent heat is zero |
| B. | Liquid directly becomes steam |
| C. | Specific volume of steam and liquid is same |
| D. | This is the maximum pressure limit |
| Answer» E. | |
| 250. |
A compound steam engine in which the high pressure and low pressure cylinders have common piston rod, is called |
| A. | Receiver type compound engine |
| B. | Tandem type compound engine |
| C. | Woolf type compound engine |
| D. | None of these |
| Answer» C. Woolf type compound engine | |