McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 151. |
Death is almost certain when the current through human body is |
| A. | 100 milli-amperes |
| B. | 10 micro-amperes |
| C. | 25 micro-amperes |
| D. | 100 micro-amperes |
| E. | 10 milli-amperes |
| Answer» A. 100 milli-amperes | |
| 152. |
API gravity of water is taken as |
| A. | zero |
| B. | 1 |
| C. | 10 |
| D. | 100 |
| E. | None of the above |
| Answer» B. 1 | |
| 153. |
Which of the following power plant can generate power at unpredictable or uncontrolled times? |
| A. | Wind power plant |
| B. | Tidal power plant |
| C. | Solar power plant |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 154. |
Turnaround efficiency of pumped hydro schemes seldom exceeds |
| A. | 10% |
| B. | 15% |
| C. | 25% |
| D. | 65% |
| E. | None of the above |
| Answer» D. 65% | |
| 155. |
Standby losses are least in case of |
| A. | Gas turbine power plant |
| B. | Diesel engine power plant |
| C. | Hydro-electric power plant |
| D. | Steam power plant |
| E. | Nuclear power plant |
| Answer» C. Hydro-electric power plant | |
| 156. |
Approximately how many kg of air are required for the combustion of one kg of diesel oil? |
| A. | 15 kg |
| B. | 25 kg |
| C. | 1 kg |
| D. | 35 kg |
| E. | 5 kg |
| Answer» A. 15 kg | |
| 157. |
Which of the following variety of coal will have highest ash content |
| A. | Grade I steam coal |
| B. | Bituminous coal |
| C. | Coking coal |
| D. | Bengal coal |
| E. | Lignite |
| Answer» E. Lignite | |
| 158. |
The effect of wind pressure is more predominant on |
| A. | transmission lines |
| B. | neutral wires |
| C. | insulators |
| D. | supporting towers |
| E. | None of the above |
| Answer» D. supporting towers | |
| 159. |
Argillaceous rocks have |
| A. | high clay content |
| B. | high moisture content |
| C. | low moisture content |
| D. | low mineral content |
| E. | None of the above |
| Answer» A. high clay content | |
| 160. |
Beaufort scale is graded from 0 to |
| A. | 10 |
| B. | 12 |
| C. | 22 |
| D. | 100 |
| E. | None of the above |
| Answer» B. 12 | |
| 161. |
In hydrothermal source of geothermal energy |
| A. | hot water or steam is available |
| B. | hot gases are available |
| C. | molten lava is available |
| D. | none of the above |
| E. | None of the above |
| Answer» A. hot water or steam is available | |
| 162. |
Presence of ozone as a result of corona is harmful because |
| A. | it gives bad odour |
| B. | it corrodes the material |
| C. | it transfers energy to the ground |
| D. | it reduces power factor |
| E. | None of the above |
| Answer» B. it corrodes the material | |
| 163. |
The source of energy for satellite is |
| A. | battery |
| B. | solar cell |
| C. | cryogenic storage |
| D. | Any of the above |
| E. | None of the above |
| Answer» B. solar cell | |
| 164. |
Which type of power plant will be preferred for a location in Bihar? |
| A. | Nuclear power plant |
| B. | Hydro-electric power plant |
| C. | Thermal power plant |
| D. | Solar power plant |
| E. | None of the above |
| Answer» C. Thermal power plant | |
| 165. |
Petrothermal systems are composed of hot dry rock with |
| A. | no underground water |
| B. | large underground water |
| C. | petrochemicals |
| D. | dense gases |
| E. | None of the above |
| Answer» A. no underground water | |
| 166. |
The tax imposed on power supplied to consumers is known as |
| A. | excise duty |
| B. | sales tax |
| C. | toll tax |
| D. | electricity duty |
| E. | None of the above |
| Answer» D. electricity duty | |
| 167. |
The maximum theoretical efficiencies of solar cells could be around |
| A. | 99% |
| B. | 60% |
| C. | 48% |
| D. | 1% |
| E. | None of the above |
| Answer» C. 48% | |
| 168. |
Heavy water production plants in India are located at all the following places EXCEPT |
| A. | Nangal |
| B. | Bombay |
| C. | Baroda |
| D. | Tuticorin |
| E. | None of the above |
| Answer» B. Bombay | |
| 169. |
Presence of sand in geopressured water is likely to cause problems of |
| A. | erosion |
| B. | heat exchange |
| C. | water circulation |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 170. |
Highly skilled manpower is needed for the maintendance of which of the following power plants? |
| A. | Steam power plant |
| B. | Diesel engine power plant |
| C. | Nuclear power plant |
| D. | Gas turbine power plant |
| E. | Hydro-electric power plant |
| Answer» C. Nuclear power plant | |
| 171. |
The power loss in an overhead transmission line is mainly due to |
| A. | Line resistance |
| B. | Line inductance |
| C. | Heat loss |
| D. | Magnetic loss |
| E. | All of the above |
| Answer» A. Line resistance | |
| 172. |
Benefication process is mainly used for |
| A. | coals |
| B. | oils |
| C. | nuclides |
| D. | minerals |
| E. | None of the above |
| Answer» A. coals | |
| 173. |
For a 66 kV transmission line having span of 200 metres between towers, the approximate sag will be |
| A. | 0.02 m |
| B. | 0.2 m |
| C. | 2 m |
| D. | 20 m |
| E. | None of the above |
| Answer» C. 2 m | |
| 174. |
Which of following converts thermal energy to kinetic energy? |
| A. | Thermocouple |
| B. | Storage battery |
| C. | Fuel cell |
| D. | Rocket |
| E. | None of the above |
| Answer» D. Rocket | |
| 175. |
A 3 phase 15 kW induction motor has a p.f. of 0.75 lagging. A bank of capacitor is connected in delta across the supply terminals and p.f. raised to 0.9 lagging. The KVAR rating of the capacitors connected in each phase will be nearly |
| A. | 4 |
| B. | 250 |
| C. | 20 |
| D. | 2 |
| E. | 1 |
| Answer» D. 2 | |
| 176. |
First aid for an electric shock victim is |
| A. | Pouring water on body |
| B. | Artificial respiration |
| C. | Massage |
| D. | Bandage |
| E. | Rubbing the skin |
| Answer» B. Artificial respiration | |
| 177. |
A turbocharger is a part of |
| A. | Thermal power plant |
| B. | Nuclear power plant |
| C. | Diesel engine power plant |
| D. | Gas turbine power plant |
| E. | Hydro-electric power plant |
| Answer» C. Diesel engine power plant | |
| 178. |
Capacity factor and load factor become identical when |
| A. | peak load is equal to the capacity of the plant |
| B. | average load is half the capacity of the plant |
| C. | average load is same as peak load |
| D. | group diversity factor is equal to peak diversity factor |
| E. | None of the above |
| Answer» A. peak load is equal to the capacity of the plant | |
| 179. |
The insulation material for a cable should have |
| A. | High dielectric strength |
| B. | High inechanical strength |
| C. | Non-inflammability |
| D. | Low cost |
| E. | All of the above |
| Answer» E. All of the above | |
| 180. |
Marsh gas is |
| A. | a mixture of gaseous hydrocarbons produced from coal or oil |
| B. | a hy-product of blast furnace |
| C. | low calorific value gas containing carbon monoxide and steam |
| D. | same as methane |
| E. | None of the above |
| Answer» D. same as methane | |
| 181. |
The main advantage of ac transmission system over dc transmission system is |
| A. | easy transmission |
| B. | less insulation problems |
| C. | less problems of instability |
| D. | less losses in transmission over long distances |
| E. | None of the above |
| Answer» D. less losses in transmission over long distances | |
| 182. |
In geopressured systems, when brine is available as the source of energy, the power is generated using |
| A. | heat exhangers |
| B. | exhaust calorimeters |
| C. | economisers |
| D. | steam traps |
| E. | None of the above |
| Answer» A. heat exhangers | |
| 183. |
Stability of a system is least affected by |
| A. | reactance of line |
| B. | losses |
| C. | reactance of generator |
| D. | output forque |
| E. | None of the above |
| Answer» B. losses | |
| 184. |
Steam pressure of super-thermal power plant is |
| A. | 15 kg/cm2 |
| B. | 200 kg/cm2 |
| C. | 100 kg/cm2 |
| D. | 170 kg/cm2 |
| E. | 50 kg/cm2 |
| Answer» D. 170 kg/cm2 | |
| 185. |
While top surface of an overfeed stoker consists of |
| A. | coal dust, ash |
| B. | ash, coal dust |
| C. | green coal, incandescent coke |
| D. | incandescent coke, green coal |
| E. | None of the above |
| Answer» C. green coal, incandescent coke | |
| 186. |
The minimum clearance of low and medium transmission lines from ground across streets is |
| A. | 2 metres |
| B. | 4 metres |
| C. | 6 metres |
| D. | 8 metres |
| E. | None of the above |
| Answer» C. 6 metres | |
| 187. |
The minimum demand on a power station is 10 MW. If the annular load factor is 40%, total evergy generated per year will be |
| A. | 35.04 x 108 kWh |
| B. | 35.04 x 107 kWh |
| C. | 35.04 x 106 kWh |
| D. | 35.04 x 105 kWh |
| E. | None of the above |
| Answer» C. 35.04 x 106 kWh | |
| 188. |
Spot the odd one out |
| A. | Colloidal fuel |
| B. | Acid sludge |
| C. | Tar |
| D. | Bark |
| E. | None of the above |
| Answer» D. Bark | |
| 189. |
Ebb current is |
| A. | the same as eddy current |
| B. | the movement of the tidal current away from shore or down a tidal stream |
| C. | the removal by screen of undesirable fine materials from broken ore |
| D. | none of the above |
| E. | None of the above |
| Answer» B. the movement of the tidal current away from shore or down a tidal stream | |
| 190. |
The area under load curve divided by maximum demand represents |
| A. | Load factor |
| B. | Diversity factor |
| C. | Connected load |
| D. | Average load |
| E. | None of the above |
| Answer» E. None of the above | |
| 191. |
Which of the following enters the super heater of a boiler? |
| A. | Wet steam |
| B. | Superheated steam |
| C. | Hot water |
| D. | Dry steam |
| E. | Cold water |
| Answer» D. Dry steam | |
| 192. |
In a diesel engine the governor controls |
| A. | fuel volume |
| B. | fuel temperature |
| C. | fuel flow rate |
| D. | fuel pressure |
| E. | None of the above |
| Answer» C. fuel flow rate | |
| 193. |
Which arrangement of poles is used for the installation of transformers and circuit breakers? |
| A. | I type |
| B. | J type |
| C. | H type |
| D. | L type |
| E. | None of the above |
| Answer» C. H type | |
| 194. |
Single peak in the load curve means |
| A. | unity load factor |
| B. | high load factor |
| C. | 0.5 load factor |
| D. | low load factor |
| E. | None of the above |
| Answer» D. low load factor | |
| 195. |
Of all the different types of conventional power plants, technological advancements are maximum in |
| A. | thermal power plants |
| B. | hydro-power plants |
| C. | gas turbine power plants |
| D. | nuclear power plants |
| E. | None of the above |
| Answer» D. nuclear power plants | |
| 196. |
Heliochemical process is the process by which |
| A. | solar energy is utilized through photosynthesis |
| B. | neutron energy is converted into thermal energy |
| C. | geothermal energy is converted into electrical energy |
| D. | wind energy is converted into electrical energy |
| E. | None of the above |
| Answer» A. solar energy is utilized through photosynthesis | |
| 197. |
The cost of fuel is least in case of |
| A. | Steam power plant |
| B. | Nuclear power plant |
| C. | Gas turbine power plants |
| D. | Diesel engine power plant |
| E. | Hydro-electric power plant |
| Answer» E. Hydro-electric power plant | |
| 198. |
Due to burning of one kg of pure carbon with a minimum quantity of air required, the percentage of carbondioxide in the exhaust gases would be |
| A. | 11.50% |
| B. | 58% |
| C. | 29% |
| D. | 10% |
| E. | 100% |
| Answer» C. 29% | |
| 199. |
Sour crude |
| A. | is corrosive when heated |
| B. | evolves significant amounts of hydrogen sulphide on distillation |
| C. | produces light fraction which require sweetening |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 200. |
In a boiler, the carry over of slugs of water into the piping due to dirty water is termed as |
| A. | beating |
| B. | foaming |
| C. | scalping |
| D. | pitting |
| E. | None of the above |
| Answer» B. foaming | |
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