MCQOPTIONS
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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.
| 151. |
The evaporation of 15.653 kg of water per hour from and at 100°C is called |
| A. | Evaporative capacity |
| B. | Factor of evaporation |
| C. | Equivalent evaporation |
| D. | One boiler h.p. |
| Answer» E. | |
| 152. |
In order to compare the capacity of boilers, the feed water temperature and working pressure are taken as |
| A. | 50°C and normal atmospheric pressure |
| B. | 50°C and 1.1 bar pressure |
| C. | 100°C and normal atmospheric pressure |
| D. | 100°C and 1.1 bar pressure |
| Answer» D. 100°C and 1.1 bar pressure | |
| 153. |
Vacuum for reciprocating steam engines compared to steam turbines is |
| A. | More |
| B. | Equal |
| C. | Less |
| D. | Could be more or less depending on the size of plant |
| Answer» D. Could be more or less depending on the size of plant | |
| 154. |
A condenser in a steam power plant |
| A. | Increases expansion ratio of steam |
| B. | Reduces back pressure of steam |
| C. | Reduces temperature of exhaust steam |
| D. | All of these |
| Answer» E. | |
| 155. |
The ratio of heat equivalent to brake power to the energy supplied in steam is known as |
| A. | Mechanical efficiency |
| B. | Overall efficiency |
| C. | Indicated thermal efficiency |
| D. | Brake thermal efficiency |
| Answer» E. | |
| 156. |
A closed vessel made of steel and used for the generation of steam is called a |
| A. | Steam boiler |
| B. | Steam turbine |
| C. | Steam condenser |
| D. | Steam injector |
| Answer» B. Steam turbine | |
| 157. |
In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine |
| A. | Lancashire boiler |
| B. | Locomotive boiler |
| C. | Babcock and Wilcox boiler |
| D. | Benson boiler |
| Answer» C. Babcock and Wilcox boiler | |
| 158. |
Boiler stays are used to |
| A. | Prevent flat surfaces under pressure from tearing apart |
| B. | Take care of failure in shear |
| C. | Take care of failure in compression |
| D. | Provide support for boiler |
| Answer» B. Take care of failure in shear | |
| 159. |
Latent heat of dry steam at atmospheric pressure is equal to |
| A. | 539 kcal/ kg |
| B. | 539 BTU/ lb |
| C. | 427 kcal/ kg |
| D. | 100 kcal/ kg |
| Answer» B. 539 BTU/ lb | |
| 160. |
In case of condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is _________ the atmospheric pressure. |
| A. | Equal to |
| B. | Lower than |
| C. | Higher than |
| D. | None of these |
| Answer» D. None of these | |
| 161. |
Which of the following compound steam engine requires a smaller flywheel? |
| A. | Receiver type |
| B. | Tandem type |
| C. | Woolf type |
| D. | All of these |
| Answer» B. Tandem type | |
| 162. |
The ultimate analysis of fuel lists |
| A. | Various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume |
| B. | Various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight |
| C. | Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash |
| D. | Fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash |
| Answer» C. Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash | |
| 163. |
The proximate analysis of fuel lists |
| A. | Various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume |
| B. | Various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight |
| C. | Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash |
| D. | Fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash |
| Answer» E. | |
| 164. |
Lancashire boiler is a |
| A. | Stationary fire tube boiler |
| B. | Stationary water tube boiler |
| C. | Water tube boiler with natural/forced circulation |
| D. | Mobile fire tube boiler |
| Answer» B. Stationary water tube boiler | |
| 165. |
The safety valve at superheater as compared to drum safety valve setting is set at |
| A. | Higher value |
| B. | Lower value |
| C. | Same value |
| D. | Any value |
| Answer» C. Same value | |
| 166. |
The economiser is used in boilers to |
| A. | Increase thermal efficiency of boiler |
| B. | Economize on fuel |
| C. | Extract heat from the exhaust flue gases |
| D. | Increase flue gas temperature |
| Answer» B. Economize on fuel | |
| 167. |
In a nozzle, the effect of super-saturation is to |
| A. | Decrease dryness fraction of steam |
| B. | Decrease specific volume of steam |
| C. | Increase the entropy |
| D. | Increase the heat drop |
| Answer» D. Increase the heat drop | |
| 168. |
The critical pressure at which latent heat of vaporisation is zero is |
| A. | 225.65 kgf/ cm² |
| B. | 273 kgf/ cm² |
| C. | 100 kgf/ cm² |
| D. | 1 kgf/ cm² |
| Answer» B. 273 kgf/ cm² | |
| 169. |
The steam enters the nozzle at a |
| A. | High pressure and a low velocity |
| B. | High pressure and a high velocity |
| C. | Low pressure and a low velocity |
| D. | Low pressure and a high velocity |
| Answer» B. High pressure and a high velocity | |
| 170. |
Primary air is the air used to |
| A. | Provide air around burners for obtaining optimum combustion |
| B. | Transport and dry the coal |
| C. | Convert CO (formed in lower zone of furnace) into CO₂ at higher zone |
| D. | Air delivered by forced draft fan |
| Answer» C. Convert CO (formed in lower zone of furnace) into CO₂ at higher zone | |
| 171. |
Tertiary air is the air used to |
| A. | Provide air around burners for obtaining optimum combustion |
| B. | Transport and dry the coal |
| C. | Cool the scanners |
| D. | Convert CO (formed in lower zone of furnace) into CO₂ at higher zone |
| Answer» E. | |
| 172. |
The coal requirement per kW hour generation in the thermal power plant is of the order of |
| A. | 0.1 to 0.2 kg |
| B. | 0.2 to 0.4 kg |
| C. | 0.6 to 0.8 kg |
| D. | 1.0 to 1.5 kg |
| Answer» D. 1.0 to 1.5 kg | |
| 173. |
The diameter of cylindrical shell of the Lancashire boiler is of the order of |
| A. | 1 to 1.25 m |
| B. | 1 to 1.75 m |
| C. | 2 to 4 m |
| D. | 1.75 to 2.75 m |
| Answer» E. | |
| 174. |
Calorific value of coal is of the order of |
| A. | 200-400 kcal/ kg |
| B. | 800-1200 kcal/ kg |
| C. | 2000-4000 kcal/ kg |
| D. | 5000-8000 kcal/ kg |
| Answer» D. 5000-8000 kcal/ kg | |
| 175. |
The diameter of Cornish boiler is of the order of |
| A. | 12 m |
| B. | 1.52.5 m |
| C. | 23 m |
| D. | 2.53.5 m |
| Answer» B. 1.52.5 m | |
| 176. |
Thermal efficiency of a thermal power plant is of the order of |
| A. | 15 % |
| B. | 20 % |
| C. | 30 % |
| D. | 45 % |
| Answer» D. 45 % | |
| 177. |
The length of Cornish boiler is of the order of |
| A. | 24 m |
| B. | 35 m |
| C. | 57.5 m |
| D. | 79 m |
| Answer» D. 79 m | |
| 178. |
The diameter of fire tubes in Cochran boiler is of the order of |
| A. | 2 cm |
| B. | 6 cm |
| C. | 8 cm |
| D. | 12 cm |
| Answer» C. 8 cm | |
| 179. |
The performance of a boiler is measured by the |
| A. | Amount of water evaporated per hour |
| B. | Steam produced in kg/h |
| C. | Steam produced in kg/kg of fuel burnt |
| D. | All of these |
| Answer» E. | |
| 180. |
Size of boiler tubes is specified by |
| A. | Mean diameter and thickness |
| B. | Inside diameter and thickness |
| C. | Outside diameter and thickness |
| D. | Outside diameter and inside diameter |
| Answer» D. Outside diameter and inside diameter | |
| 181. |
De-Laval turbines are mostly used |
| A. | Where low speeds are required |
| B. | For small power purposes and low speeds |
| C. | For large power purposes |
| D. | For small power purposes and high speeds |
| Answer» E. | |
| 182. |
Hygrometry deals with the |
| A. | Hygroscopic substances |
| B. | Water vapor in air |
| C. | Temperature of air |
| D. | Pressure of air |
| Answer» C. Temperature of air | |
| 183. |
Curtis turbine is a |
| A. | Simple reaction turbine |
| B. | Velocity compounded turbine |
| C. | Pressure compounded turbine |
| D. | Pressure-velocity compounded turbine |
| Answer» E. | |
| 184. |
The water tubes in a simple vertical boiler are |
| A. | Horizontal |
| B. | Vertical |
| C. | Inclined |
| D. | None of these |
| Answer» D. None of these | |
| 185. |
In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, p₂) will be |
| A. | 3.3 bar |
| B. | 5.46 bar |
| C. | 8.2 bar |
| D. | 9.9 bar |
| Answer» C. 8.2 bar | |
| 186. |
In a reaction turbine when the degree of reaction is zero, then there is |
| A. | No heat drop in moving blades |
| B. | No heat drop in fixed blades |
| C. | Maximum heat drop in moving blades |
| D. | Maximum heat drop in fixed blades |
| Answer» B. No heat drop in fixed blades | |
| 187. |
When the speed of the engine is controlled by means of a valve in a steam pipe, which regulates the pressure of steam entering the engine, then the governing is known as |
| A. | Throttle governing |
| B. | Cut-off governing |
| C. | By-pass governing |
| D. | None of these |
| Answer» B. Cut-off governing | |
| 188. |
In order to obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will |
| A. | Remain unaffected |
| B. | Improve |
| C. | Worsen |
| D. | May improve/worsen depending on size |
| Answer» D. May improve/worsen depending on size | |
| 189. |
The ratio of heat utilized to produce steam and the heat liberated in furnace is known as |
| A. | Boiler effectiveness |
| B. | Boiler evaporative capacity |
| C. | Factor of evaporation |
| D. | Boiler efficiency |
| Answer» E. | |
| 190. |
Fire tube boilers are limited to a maximum design working pressure of |
| A. | 1 kg/cm |
| B. | 6 kg/cm |
| C. | 17 kg/cm² |
| D. | 100 kg/cm² |
| Answer» D. 100 kg/cm² | |
| 191. |
Fire tube boilers are limited to a maximum working pressure of |
| A. | 0.17 MN/m² |
| B. | 1.7 MN/m² |
| C. | 17 MN/m² |
| D. | 170 MN/m² |
| Answer» C. 17 MN/m² | |
| 192. |
The discharge is __________ at critical pressure. |
| A. | Zero |
| B. | Minimum |
| C. | Maximum |
| D. | None of these |
| Answer» D. None of these | |
| 193. |
The critical pressure ratio is given by (where p₁ = Initial pressure of steam, and p₂ = Pressure of steam at throat or critical pressure) |
| A. | p₁. p₂ |
| B. | p₁/p₂ |
| C. | p₂/p₁ |
| D. | p₁ + p₂ |
| Answer» D. p₁ + p₂ | |
| 194. |
One kilowatt-hour energy is equivalent to |
| A. | 1000 J |
| B. | 360 kJ |
| C. | 3600 kJ |
| D. | 3600 kW/sec |
| Answer» D. 3600 kW/sec | |
| 195. |
The behavior of coal in a furnace is determined by |
| A. | The content of sulphur |
| B. | The content of ash and heating value |
| C. | The proximate analysis |
| D. | The exact analysis |
| Answer» D. The exact analysis | |
| 196. |
Stage efficiency is also known as |
| A. | Diagram efficiency |
| B. | Nozzle efficiency |
| C. | Gross efficiency |
| D. | None of these |
| Answer» D. None of these | |
| 197. |
Blading efficiency is also known as |
| A. | Stage efficiency |
| B. | Diagram efficiency |
| C. | Nozzle efficiency |
| D. | None of these |
| Answer» C. Nozzle efficiency | |
| 198. |
Willian's law states that the steam consumption per hour provided with a throttled governor is proportional to (where I.P. = Indicated power) |
| A. | 1/(I.P) |
| B. | 1/(I.P)² |
| C. | I.P. |
| D. | (I.P.)² |
| Answer» D. (I.P.)² | |
| 199. |
The crown of the fire box is made hemispherical in order to |
| A. | Give maximum space |
| B. | Give maximum strength |
| C. | Withstand pressure inside boiler |
| D. | Resist intense heat in fire box |
| Answer» E. | |
| 200. |
The safety valve on boiler drum compared to safety valve on superheater is set at |
| A. | Same value |
| B. | Higher value |
| C. | Lower value |
| D. | Lower/higher depending on steam flow |
| Answer» C. Lower value | |