McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
| 301. |
When the power is to be transmitted over a distance of 580 km, the transmission voltage should be in the range |
| A. | 33 kV - 66 kV |
| B. | 66 kV - 100 kV |
| C. | 110 kV - 150 kV |
| D. | 150 kV - 200 kV |
| E. | None of the above |
| Answer» D. 150 kV - 200 kV | |
| 302. |
Geothermal energy is |
| A. | a renewable energy source |
| B. | an alternative energy source |
| C. | an inexhaustible energy source |
| D. | any of the above |
| E. | None of the above |
| Answer» D. any of the above | |
| 303. |
In a power plant, if the system voltage is dropped by 10 percent, the load will drop by about |
| A. | 1 percent |
| B. | 5 percent |
| C. | 10 percent |
| D. | 20 percent |
| E. | None of the above |
| Answer» C. 10 percent | |
| 304. |
A micro hydel project has |
| A. | low head availability |
| B. | low power potential |
| C. | low discharge |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 305. |
Which of the following needs to be filtered in a diesel engine? |
| A. | Air and diesel oil only |
| B. | Air only |
| C. | Lubrecating oil only |
| D. | Air, diesel oil and lubricating |
| E. | Diesel oil only |
| Answer» D. Air, diesel oil and lubricating | |
| 306. |
All of the following are hard coals EXCEPT |
| A. | Authracite |
| B. | Lignite |
| C. | Bituminous |
| D. | Semi-bituminous |
| E. | None of the above |
| Answer» B. Lignite | |
| 307. |
For transmission lines the standing wave ratio is the ratio of |
| A. | maximum foltage to minimum voltage |
| B. | maximum current to minimum voltage |
| C. | peak voltage to rms voltage |
| D. | maximum reactance to minimum reactance |
| E. | None of the above |
| Answer» A. maximum foltage to minimum voltage | |
| 308. |
Reflecting mirrors for solar energy are known as |
| A. | diffusers |
| B. | ponds |
| C. | heliostats |
| D. | mantle |
| E. | None of the above |
| Answer» C. heliostats | |
| 309. |
Litz wire, is used for intermediate frequencies to overcome |
| A. | corona effect |
| B. | skin effect |
| C. | radio interference |
| D. | All of the above |
| E. | None of the above |
| Answer» B. skin effect | |
| 310. |
The insulators for overhead lines are generally made of |
| A. | Porcelain |
| B. | Wood |
| C. | Copper |
| D. | Plastic |
| E. | Aluminium |
| Answer» A. Porcelain | |
| 311. |
Which type of conductors are used for transmitting bulk of power at high voltage? |
| A. | ACSR |
| B. | Copper |
| C. | Cadmium copper |
| D. | Galvanised steel |
| E. | Any of the above |
| Answer» A. ACSR | |
| 312. |
The major constituent of natural gas is |
| A. | Hydrogen |
| B. | Carbon monoxide |
| C. | Ammonia |
| D. | Methane |
| E. | Acetylene |
| Answer» D. Methane | |
| 313. |
Long distance electric trains take power on |
| A. | 600 V dc |
| B. | 25 kV single phase ac |
| C. | 25 kV two phase ac |
| D. | 1500 V dc |
| E. | 25 kV three phase ac |
| Answer» B. 25 kV single phase ac | |
| 314. |
Wind form of power generation are being established at |
| A. | Kutch |
| B. | Tuticorin |
| C. | J & K |
| D. | all above places |
| E. | None of the above |
| Answer» D. all above places | |
| 315. |
Which lamp is used for cinerma projectors |
| A. | Carbon arc lamp |
| B. | Nitrogen filled GLS lamp |
| C. | Mercury vapour lamp |
| D. | Sodium vapour lamp |
| E. | Frosted GLS lamp |
| Answer» A. Carbon arc lamp | |
| 316. |
A load curve is the relationship between load on power plant with the |
| A. | average time |
| B. | instantaneous time |
| C. | time in chronological order |
| D. | algebraic sum of times |
| E. | None of the above |
| Answer» C. time in chronological order | |
| 317. |
Heavy water is used in a nuclear power plant as a |
| A. | Coolant |
| B. | Reflector |
| C. | Fuel |
| D. | Shield |
| E. | Moderator |
| Answer» E. Moderator | |
| 318. |
The power factor of a three phase induction motor at no load will be |
| A. | 0.5 to 0.6 leading |
| B. | 0.5 to 0.6 lagging |
| C. | 0.2 to 0.3 lagging |
| D. | Zero |
| E. | 0.2 to 0.3 leading |
| Answer» C. 0.2 to 0.3 lagging | |
| 319. |
The power factor of a load of 100 kW is to be raised from 0.5 lagging to 0.9 lagging. The KVA rating of the capacitor will be |
| A. | 12.5 |
| B. | 212.5 |
| C. | 25 |
| D. | 125 |
| E. | 75 |
| Answer» D. 125 | |
| 320. |
One kilowatt hour is equal to |
| A. | 86,000 calories |
| B. | 8600 calories |
| C. | 860,000 calories |
| D. | 8600,000 calories |
| E. | 86,000,000 calories |
| Answer» C. 860,000 calories | |
| 321. |
1 kilowatt hour is the same as |
| A. | 1000 joules |
| B. | 1000 watt-sec |
| C. | 3600 watt-hours |
| D. | 3600,000 watt-sec |
| E. | 1 joule |
| Answer» D. 3600,000 watt-sec | |
| 322. |
A 11 kV transmission line carries power to a distance of 30 kilometres. This will be termed as |
| A. | Short transmission line |
| B. | Medium transmission line |
| C. | Long transmission line |
| D. | Very long transmission line |
| E. | None of the above |
| Answer» A. Short transmission line | |
| 323. |
The dielectric strength of rubber is about |
| A. | 3 kV/mm |
| B. | 30 kV/m |
| C. | 30 kV/cm |
| D. | None of the above |
| E. | All of the above |
| Answer» B. 30 kV/m | |
| 324. |
ACSR conductor having 7 steel strands surrounded by 25 aluminium conductors will be specified as |
| A. | 7?25 |
| B. | 7?32 |
| C. | 25?7 |
| D. | 25?32 |
| E. | None of the above |
| Answer» C. 25?7 | |
| 325. |
Compressed air is required in diesel engine power plants mainly for |
| A. | Starting the engine |
| B. | Cleaning |
| C. | On fiteration |
| D. | Water aeration |
| E. | All of the above |
| Answer» A. Starting the engine | |
| 326. |
The chances of corona are maximum during |
| A. | summer heat |
| B. | winter |
| C. | dry water |
| D. | humid weather |
| E. | None of the above |
| Answer» D. humid weather | |
| 327. |
The expected life of a GLS lamp is nearly |
| A. | 50 hours |
| B. | 10,000 hours |
| C. | 5000 hours |
| D. | 1000 hours |
| E. | 100 hours |
| Answer» D. 1000 hours | |
| 328. |
Neglecting losses in a transmission system, if the voltage is doubled for the same power transmission, the weight of conductor material required will be |
| A. | four times |
| B. | double |
| C. | half |
| D. | one-fourth |
| E. | None of the above |
| Answer» D. one-fourth | |
| 329. |
Skin effects is proportional to |
| A. | diameter of conductor |
| B. | (diameter of conductor) |
| C. | (diameter of conductor)2 |
| D. | (diameter of conductor)3 |
| E. | None of the above |
| Answer» C. (diameter of conductor)2 | |
| 330. |
The thickness of the layer of insulation on a cable depends on |
| A. | KVA |
| B. | kW |
| C. | Power factor |
| D. | Voltage |
| E. | Current carrying capacity of conductor |
| Answer» D. Voltage | |
| 331. |
Strain type insulators are used where the conductors are |
| A. | dead ended |
| B. | at intermediate anchor towers |
| C. | any of the above |
| D. | None of the above |
| E. | None of the above |
| Answer» C. any of the above | |
| 332. |
Coal used in power plants is also known as |
| A. | Charcoal |
| B. | Coke |
| C. | Power coal |
| D. | Steam coal |
| E. | Soft coal |
| Answer» D. Steam coal | |
| 333. |
The highest point on the load curve represents |
| A. | Maximum time |
| B. | Maximum demand |
| C. | Maximum concrete load |
| D. | KVA rating of generators |
| E. | None of the above |
| Answer» B. Maximum demand | |
| 334. |
The voltage of a single solar cell is |
| A. | 0.5 V |
| B. | 1 V |
| C. | 1.1 V |
| D. | 2.1 V |
| E. | None of the above |
| Answer» A. 0.5 V | |
| 335. |
High horse power diesel engines are usually started by |
| A. | Batteries |
| B. | Compressed air |
| C. | Cranking |
| D. | Self-starter or cranking |
| E. | Self-starter |
| Answer» B. Compressed air | |
| 336. |
In case of humic coals, hydrogen percentage varies from |
| A. | 4 to 6 percent |
| B. | 10 to 15 percent |
| C. | 16 to 20 percent |
| D. | 20 to 30 percent |
| E. | None of the above |
| Answer» A. 4 to 6 percent | |
| 337. |
Which of the following motor can operate on lagging as well as leading power factor? |
| A. | Synchronous motor |
| B. | Universal motor |
| C. | Reluctance motor |
| D. | Squirrel cage induction motor |
| E. | Capacitor run motor |
| Answer» A. Synchronous motor | |
| 338. |
A 200 MW generator will invariably be |
| A. | Hydrogen cooled |
| B. | Nitrogen cooled |
| C. | Air cooled |
| D. | Oxygen cooled |
| E. | Pressurised air cooled |
| Answer» A. Hydrogen cooled | |
| 339. |
Presence of non-condensable gases in geopressured water causes |
| A. | corrosion of parts |
| B. | pollution |
| C. | flow problems |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 340. |
Which of the following place is not associated with nuclear power plants? |
| A. | Narora |
| B. | Kamalappakam |
| C. | Tarapur |
| D. | Kora |
| E. | Bangalore |
| Answer» E. Bangalore | |
| 341. |
Pearlite is |
| A. | a low ash containing coal |
| B. | same as lignite |
| C. | an insulation material |
| D. | none of the above |
| E. | None of the above |
| Answer» C. an insulation material | |
| 342. |
The term 'critical' is associated with 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» E. Nuclear power plant | |
| 343. |
Reverse capacity of a plants is given by |
| A. | Maximum demand - Average demand |
| B. | Plant capacity - Maximum demand |
| C. | Plant capacity - Average demand |
| D. | Plant capacity x (1 - Load factor) |
| E. | None of the above |
| Answer» B. Plant capacity - Maximum demand | |
| 344. |
The standard wattage of 4 feet fluorescent tube is |
| A. | 500 W |
| B. | 250 W |
| C. | 10 W |
| D. | 40 W |
| E. | 100 W |
| Answer» D. 40 W | |
| 345. |
Standed conductors are used for transmitting power at high voltages because of |
| A. | increased tensile strength |
| B. | low cost |
| C. | case in handling |
| D. | low wind resistance |
| E. | None of the above |
| Answer» C. case in handling | |
| 346. |
In a transmission line if booster transformer is to be used, the preferred location will be |
| A. | at the receiving end |
| B. | at the sending end |
| C. | at the intermediate point |
| D. | anywhere in the line |
| E. | None of the above |
| Answer» C. at the intermediate point | |
| 347. |
For the same wattage, which of the following lamp is cheapest? |
| A. | Fluorescent tube 2 ft. |
| B. | GLS lamp |
| C. | Fluorescent tube 4 ft. |
| D. | Mercury vapour lamp |
| E. | Sodium vapour lamp |
| Answer» B. GLS lamp | |
| 348. |
One British thermal unit (BTU) is nearly equal to |
| A. | 252 joules |
| B. | 2106 joules |
| C. | 243 joules |
| D. | 1053 joules |
| E. | 504 joules |
| Answer» D. 1053 joules | |
| 349. |
At which of a following speed the generators for 3 phase, 50 Hz supply will not run? |
| A. | 1200 rpm |
| B. | 500 rpm |
| C. | 250 rpm |
| D. | 166? rpm |
| E. | 750 rpm |
| Answer» A. 1200 rpm | |
| 350. |
The specific gravity of diesel oil is closer to |
| A. | 2.7 |
| B. | 0.35 |
| C. | 1 |
| D. | 0.84 |
| E. | 1.35 |
| Answer» D. 0.84 | |
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