McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 201. |
Which of the following relation is incorrect? |
| A. | Capacity factor = Utilization factor x Load factor |
| B. | Load factor x Maximum load = Average load |
| C. | Demand factor x Connected load = Maximum demand |
| D. | None of the above |
| E. | None of the above |
| Answer» D. None of the above | |
| 202. |
The useful life of static capacitor can be expected to be |
| A. | 6 to 8 months |
| B. | 50 to 100 years |
| C. | 1 to 2 years |
| D. | 8 to 10 years |
| E. | 2 to 3 months |
| Answer» D. 8 to 10 years | |
| 203. |
The fixed cost of a power plant depends on |
| A. | Installed capacity |
| B. | Demand factor |
| C. | Diversity factor |
| D. | Average demand |
| E. | All of the above |
| Answer» A. Installed capacity | |
| 204. |
In the geysers steam is continuously vented through fissures in the ground. These vents are called |
| A. | vent holes |
| B. | dot holes |
| C. | fumaroles |
| D. | sunspots |
| E. | None of the above |
| Answer» C. fumaroles | |
| 205. |
One kilowatt hour is nearly equal to |
| A. | 3400 B.T.U. |
| B. | 3.4 B.T.U. |
| C. | 340 B.T.U. |
| D. | 34 B.T.U. |
| E. | 34000 B.T.U. |
| Answer» A. 3400 B.T.U. | |
| 206. |
Total load transmitted through a 3-phase transmission line is 10,000 kW at 0.8 power factor lagging. The I2 R losses are 900 kW. The efficiency of transmission line is |
| A. | 60% |
| B. | 90% |
| C. | 95% |
| D. | 99% |
| E. | None of the above |
| Answer» B. 90% | |
| 207. |
A draft tube is a part of which power plants? |
| A. | Diesel engine power plant |
| B. | Gas turbine power plant |
| C. | Steam power plant |
| D. | Hydro-electric power plant |
| E. | All of the above |
| Answer» D. Hydro-electric power plant | |
| 208. |
Material generally used for bus bars is |
| A. | cast iron |
| B. | tungsten |
| C. | Stainless steel |
| D. | copper |
| E. | None of the above |
| Answer» D. copper | |
| 209. |
The calorific value of which of the following files is expected to be nearly equal? |
| A. | Coal gas and lignite coal |
| B. | Natural gas and coal gas |
| C. | Anthracite coal and lignite |
| D. | Petrol and diesel oil |
| E. | None of the above |
| Answer» D. Petrol and diesel oil | |
| 210. |
The critical pressure water is |
| A. | 100 kg/cm2 |
| B. | More than 200 kg/cm2 |
| C. | Less than 200 kg/cm2 |
| D. | 1 atm |
| E. | 150 kg/cm2 |
| Answer» B. More than 200 kg/cm2 | |
| 211. |
Cleat is |
| A. | main joint in a coal seam along which it breaks most easily |
| B. | floor of a coal seam |
| C. | carbon and sulphur compound |
| D. | crude oil containing low percentage of sulphur |
| E. | None of the above |
| Answer» A. main joint in a coal seam along which it breaks most easily | |
| 212. |
The disadvantage of constant voltage transmission is |
| A. | short circuit current of the system is increased |
| B. | low power factor in heavy loads |
| C. | large conductor area is required for same power transmission |
| D. | All of the above |
| E. | None of the above |
| Answer» A. short circuit current of the system is increased | |
| 213. |
Which of the following is a petroleum fuel? |
| A. | Benzol |
| B. | Methyl alcohol |
| C. | Ethyl alcohol |
| D. | Naphta |
| E. | None of the above |
| Answer» D. Naphta | |
| 214. |
Baryon is one of the class of heavy elementary particles that includes |
| A. | hyperons |
| B. | neutrons |
| C. | protons |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 215. |
A single unit of 50 MW is generally not available with which type of power plant? |
| A. | Diesel engine power plant |
| B. | Gas turbine power plant |
| C. | Steam power plant |
| D. | Nuclear power plant |
| E. | Hydro-electric power plant |
| Answer» A. Diesel engine power plant | |
| 216. |
In the areas where snowfall is frequent, under worst conditions, the thickness of ice on a conductor is |
| A. | 1.25 cm |
| B. | 2.75 cm |
| C. | 4.75 cm |
| D. | 6.25 cm |
| E. | None of the above |
| Answer» A. 1.25 cm | |
| 217. |
Most of the generators in thermal power plants run at |
| A. | 15000 rpm |
| B. | 3000 rpm |
| C. | 750 rpm |
| D. | 1000 rpm |
| E. | 1500 rpm |
| Answer» B. 3000 rpm | |
| 218. |
Which of the following state in India is relatively rich in coal deposits? |
| A. | Kerala |
| B. | Andhra Pradesh |
| C. | U.P. |
| D. | Rajasthan |
| E. | Bihar |
| Answer» E. Bihar | |
| 219. |
Corona effect can be detected by |
| A. | hissing sound |
| B. | faint luminous glow of bluish colour |
| C. | presence of ozone detected by odour |
| D. | all of the above |
| E. | None of the above |
| Answer» D. all of the above | |
| 220. |
Least overall efficiency can be expected in which type of power plant? |
| A. | Gas turbine power plant |
| B. | Steam power plant |
| C. | Hydro-electric power plant |
| D. | Diesel engine power plant |
| E. | Nuclear power plant |
| Answer» B. Steam power plant | |
| 221. |
Which of the following engine has the highest air-fuel ratio? |
| A. | Petrol engine |
| B. | All above has got nearly same air fuel ratio |
| C. | Gas turbine |
| D. | Gas engine |
| E. | Diesel engine |
| Answer» C. Gas turbine | |
| 222. |
Visible spectrum of light has wavelength in the range |
| A. | 4000 to 7000 A |
| B. | 100 to 400 A |
| C. | 40,000 to 70,000 A |
| D. | 14,000 to 17,000 A |
| E. | 10 to 40 A |
| Answer» A. 4000 to 7000 A | |
| 223. |
Which of the following equipment is not installed in a substation? |
| A. | Exciters |
| B. | Series capacitors |
| C. | Shunt reactors |
| D. | Voltage transformers |
| E. | None of the above |
| Answer» A. Exciters | |
| 224. |
Which of the following equipment has power factor closer to unity |
| A. | GLS lamp |
| B. | Single phase capacitor motor |
| C. | Induction motor |
| D. | Fluorescent lamp |
| E. | Carbon arc lamp |
| Answer» A. GLS lamp | |
| 225. |
Which of the following power plant has the highest cost per kW installed? |
| A. | Nuclear power plant |
| B. | Steam power plant |
| C. | Hydro-electric power |
| D. | Diesel engine power plant |
| E. | Gas turbine power plant |
| Answer» A. Nuclear power plant | |
| 226. |
Power factor is expected to be highest in case of |
| A. | Carbon arc lamp |
| B. | Tube lights |
| C. | Sodium lamps |
| D. | GLS lamp |
| E. | Mercury vapour lamp |
| Answer» D. GLS lamp | |
| 227. |
Low grade fuels have |
| A. | Low moisture constant |
| B. | Low ash content |
| C. | Low calorific value |
| D. | Low sulphur content |
| E. | All of the above |
| Answer» C. Low calorific value | |
| 228. |
The protection against lightning is provided by |
| A. | Earthing screen |
| B. | Overhead ground wires |
| C. | Lightning arresters |
| D. | Surge diverters |
| E. | Any of the above |
| Answer» E. Any of the above | |
| 229. |
Barn is |
| A. | spent fuel from a nuclear reactor |
| B. | a unit of area |
| C. | an electronic instrument for rapid counting of radiations |
| D. | a coal that does not form coke |
| E. | None of the above |
| Answer» B. a unit of area | |
| 230. |
The major share of power in India is provided by which of the following type of power plant? |
| A. | Gas turbine power plants |
| B. | Hydro-electric power plant |
| C. | Diesel engine power plant |
| D. | Nuclear power plant |
| E. | Steam power plant |
| Answer» E. Steam power plant | |
| 231. |
Batteries used for electrical energy storage are |
| A. | Leclanche cells |
| B. | Edison cells |
| C. | Lead acid cells |
| D. | Any of the above |
| E. | None of the above |
| Answer» C. Lead acid cells | |
| 232. |
Which of the following converts electrical energy to radiant heat? |
| A. | Solat cell |
| B. | Storage battery |
| C. | Wankel engine |
| D. | Incandescent lamp |
| E. | None of the above |
| Answer» D. Incandescent lamp | |
| 233. |
The most economic voltage for transmitting given power over a known distance by overhead transmission lines is approximately |
| A. | 0.6 kV/km |
| B. | 1.6 kV/km |
| C. | 2.6 kV/km |
| D. | 3.6 kV/km |
| E. | None of the above |
| Answer» A. 0.6 kV/km | |
| 234. |
Steel poles for transmission lines need protection against |
| A. | termites |
| B. | borer |
| C. | corrosion |
| D. | All of the above |
| E. | None of the above |
| Answer» C. corrosion | |
| 235. |
Integrated demand is |
| A. | the demand averaged over a specified period |
| B. | the joint-demand of several consumers |
| C. | supplementary demand of various consumers |
| D. | None of the above |
| E. | None of the above |
| Answer» A. the demand averaged over a specified period | |
| 236. |
Osmotic energy conversion involves energy production from |
| A. | low boiling point liquids |
| B. | low vapour pressure liquids |
| C. | miscible liquids |
| D. | salt water |
| E. | None of the above |
| Answer» D. salt water | |
| 237. |
Pin insulators are normally used upto voltages of about |
| A. | 100 kV |
| B. | 66 kV |
| C. | 33 kV |
| D. | 25 kV |
| E. | None of the above |
| Answer» D. 25 kV | |
| 238. |
A generating station is to supply four regions of loads with peak demands of 10 MW, 15 MW, 20 MW and 30 MW. If the diversity factor is 1.5 the maximum demand on the station is |
| A. | 30 MW |
| B. | 60 MW |
| C. | 70 MW |
| D. | 50 MW |
| E. | 45 MW |
| Answer» D. 50 MW | |
| 239. |
The power supplied to domestic consumers is at 220 volts. This represents |
| A. | Peak value of voltage |
| B. | Mean value of voltage |
| C. | rms value of voltage |
| D. | Any of the above |
| E. | None of the above |
| Answer» C. rms value of voltage | |
| 240. |
Diversity factor has direct effect on the |
| A. | fixed |
| B. | variable |
| C. | fixed and variable |
| E. | None of the above |
| Answer» A. fixed | |
| 241. |
Gas turbine power plants are being established at all of the following places EXCEPT |
| A. | Kawas |
| B. | Anta |
| C. | Auraiya |
| D. | Jagdishpur |
| E. | None of the above |
| Answer» D. Jagdishpur | |
| 242. |
Which of the following gives nearly monochromatic light? |
| A. | Sodium vapour lamp |
| B. | GLS lamp |
| C. | Fluurescent tube |
| D. | Mercury vapour lamp |
| E. | None of the above |
| Answer» A. Sodium vapour lamp | |
| 243. |
The permissible pH value of water of boilers is |
| A. | Less than 14 |
| B. | 1 |
| C. | Slightly more than 7 |
| D. | 7 |
| E. | 5 |
| Answer» C. Slightly more than 7 | |
| 244. |
For a power plant, the cost of labour is considered as |
| A. | fixed |
| B. | variable |
| C. | progressive, non-progressive |
| D. | major, minor |
| E. | None of the above |
| Answer» B. variable | |
| 245. |
For extinguishing electrical fires |
| A. | Carbondioxide fire extinguisher should be used |
| B. | Rubber pieces should be thrown |
| C. | Water should be sprinkled |
| D. | Carbon tetrachloride fire extinguisher should be used |
| E. | Conductors should be erthed |
| Answer» D. Carbon tetrachloride fire extinguisher should be used | |
| 246. |
Skin effect results in |
| A. | reduced effective resistance but increased effective internal reactance of the conductor |
| B. | increased effective resistance but reduced effective internal reactance of the conductor |
| C. | reduced effective resistance as well as effective internal reactance |
| D. | increased effective resistance as well as effective internal reactance |
| E. | None of the above |
| Answer» B. increased effective resistance but reduced effective internal reactance of the conductor | |
| 247. |
Which of the following contributes to the improvement of efficiency of Rankine cycle in a thermal power plant? |
| A. | Use of high pressures |
| B. | Reheating of steam at some intermediate stage |
| C. | Regeneration |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 248. |
Which of the following disadvantages occurs due to low power factor? |
| A. | Greater conductor size |
| B. | Poor voltage regulation |
| C. | Large copper losses |
| D. | Large KVA rating of transformers |
| E. | All of the above |
| Answer» E. All of the above | |
| 249. |
Which of the following statement is incorrect? |
| A. | As the temperature rises the tension in the transmission line decreases |
| B. | As the temperature rises the sag in transmission lines reduces |
| C. | Tension and sag in transmission lines are complementary to each other |
| E. | None of the above |
| Answer» C. Tension and sag in transmission lines are complementary to each other | |
| 250. |
In geothermal power plants waste water is |
| A. | recirculated after cooling in cooling towers |
| B. | discharged into sea |
| C. | discharged back to earth |
| D. | evaporated in ponds |
| E. | None of the above |
| Answer» C. discharged back to earth | |
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