McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electrical Engineering .
| 251. |
For diesel locomotives the range of horsepower is |
| A. | 50 to 200 |
| B. | 500 to 1000 |
| C. | 1500 to 2500 |
| D. | 3000 to 5000 |
| Answer» C. 1500 to 2500 | |
| 252. |
_______ locomotive has the highest operational availability. |
| A. | Electric |
| B. | Diesel |
| C. | Steam |
| D. | none |
| Answer» A. Electric | |
| 253. |
The horsepower of steam locomotives is |
| A. | upto 1500 |
| B. | 1500 to 2000 |
| C. | 2000 to 3000 |
| D. | 3000 to 4000 |
| Answer» A. upto 1500 | |
| 254. |
The overall efficiency of steam locomotive is around |
| A. | 5 to 10 percent |
| B. | 15 to 20 percent |
| C. | 25 to 35 percent |
| D. | 35 to 45 percent |
| Answer» A. 5 to 10 percent | |
| 255. |
In tramways which of the following motors is used ? |
| A. | D.C. shunt motor |
| B. | D.C. series motor |
| C. | A.C. three phase motor |
| D. | AC. single phase capacitor start motor |
| Answer» B. D.C. series motor | |
| 256. |
In a steam locomotive electric power is provided through |
| A. | overhead wire |
| B. | battery system |
| C. | small turbo-generator |
| D. | diesel engine generator |
| Answer» C. small turbo-generator | |
| 257. |
Which of the following drives is suitable for mines where explosive gas exists ? |
| A. | Steam engine |
| B. | Diesel engine |
| C. | Battery locomotive |
| D. | Any of the above |
| Answer» C. Battery locomotive | |
| 258. |
Overload capacity of diesel engines is usually restricted to |
| A. | 2 percent |
| B. | 10 percent |
| C. | 20 percent |
| D. | 40 percent |
| Answer» A. 2 percent | |
| 259. |
The wheels of a train, engine as well as bogies, are slightly tapered to |
| A. | reduce frietion |
| B. | increase friction |
| C. | facilitate braking |
| D. | facilitate in taking turns |
| Answer» D. facilitate in taking turns | |
| 260. |
The efficiency of diesel locomotives is nearly |
| A. | 20 to 25 percent |
| B. | 30 to 40 percent |
| C. | 45 to 55 percent |
| D. | 60 to 70 percent |
| Answer» A. 20 to 25 percent | |
| 261. |
Which of the following is the advantage of electric braking ? |
| A. | It avoids wear of track |
| B. | Motor continues to remain loaded during braking |
| C. | It is instantaneous |
| D. | More heat is generated during braking |
| Answer» A. It avoids wear of track | |
| 262. |
Which of the following braking systems on the locomotives is costly ? |
| A. | Regenerative braking on electric locomotives |
| B. | Vacuum braking on diesel locomo-tives |
| C. | Vacuum braking on steam locomo-tives |
| D. | All braking systems are equally costly |
| Answer» A. Regenerative braking on electric locomotives | |
| 263. |
Tractive effort is required to |
| A. | overcome the gravity component of train mass |
| B. | overcome friction, windage and curve resistance |
| C. | accelerate the train mass |
| D. | do all of the above |
| Answer» D. do all of the above | |
| 264. |
For given maximum axle load tractive efforts of AC. locomotive will be |
| A. | less than that of D.C. locomotive |
| B. | more than that of D.C. locomotive |
| C. | equal to that of |
| D. | C. locomotive |
| Answer» B. more than that of D.C. locomotive | |
| 265. |
Due to which of the following co-efficient of adhesion improves ? |
| A. | Rust on the rails |
| B. | Dust on the rails |
| C. | Sand on the rails |
| D. | All of the above |
| Answer» D. All of the above | |
| 266. |
Which of the following is the disadvantage of electric traction over other systems of traction ? |
| A. | Corrosion problems in the under-ground pipe work |
| B. | Short time power failure interrupts traffic for hours |
| C. | High capital outlay in fixed instal-lations beside route limitation |
| D. | Interference with communication lines |
| Answer» C. High capital outlay in fixed instal-lations beside route limitation | |
| 267. |
Speed-time curve of main line service differs from those of urban and suburban services on following account |
| A. | it has longer free running period |
| B. | it has longer coasting period |
| C. | accelerating and braking periods are comparatively smaller |
| D. | all of the above |
| Answer» D. all of the above | |
| 268. |
The rate of acceleration on suburban orurban services is restricted by the consideration of |
| A. | Engine power |
| B. | Track curves |
| C. | Passenger Discomfort |
| D. | Track size |
| Answer» D. Track size | |
| 269. |
The specific energy consumption of a train depends on which of the following ? |
| A. | Acceleration and retardation |
| B. | Gradient |
| C. | Distance covered |
| D. | All of the above |
| Answer» C. Distance covered | |
| 270. |
The friction at the track is proportional to |
| A. | 1/speed |
| B. | l/(speed)2 |
| C. | speed |
| D. | none of the above |
| Answer» C. speed | |
| 271. |
The resistance encountered by a train in motion is on account of |
| A. | resistance offered by air |
| B. | friction at the track |
| C. | friction at various parts of the rolling stock |
| D. | all of the above |
| Answer» D. all of the above | |
| 272. |
Battery operated trucks are used in |
| A. | steel mills |
| B. | power stations |
| C. | narrow gauge traction |
| D. | factories for material transportation |
| Answer» D. factories for material transportation | |
| 273. |
method can bring the locomotive to dead stop. |
| A. | Plugging braking |
| B. | Rheostatic braking |
| C. | Regenerative braking |
| D. | None of the above |
| Answer» A. Plugging braking | |
| 274. |
The voltage used for suburban trains in D.C. system is usually |
| A. | 12 V |
| B. | 24 V |
| C. | 220 V |
| D. | 600 to 750 V |
| Answer» D. 600 to 750 V | |
| 275. |
For three-phase induction motors which of the following is the least efficient method of speed control ? |
| A. | Cascade control |
| B. | Pole changing |
| C. | Rheostatic control |
| D. | Combination of cascade and pole changing |
| Answer» C. Rheostatic control | |
| 276. |
Specific energy consumption becomes |
| A. | more on steeper gradient |
| B. | more with high train resistance |
| C. | less if distance between stops is more |
| D. | all of the above |
| Answer» D. all of the above | |
| 277. |
In main line service as compared to urban and suburban service |
| A. | distance between the stops is more |
| B. | maximum speed reached is high |
| C. | acceleration and retardation rates are low |
| D. | all of the above |
| Answer» D. all of the above | |
| 278. |
Locomotive having monomotor bogies |
| A. | has better coefficient of adhesion |
| B. | are suited both for passanger as well as freight service |
| C. | has better riding qualities due to the reduction of lateral forces |
| D. | has all above qualities |
| Answer» D. has all above qualities | |
| 279. |
Series motor is not suited for traction duty due to which of the following account ? |
| A. | Less current drain on the heavy load torque |
| B. | Current surges after temporary switching off supply |
| C. | Self relieving property |
| D. | Commutating property at heavy load |
| Answer» B. Current surges after temporary switching off supply | |
| 280. |
When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when |
| A. | wheel base of axles is more |
| B. | degree of curvature is more |
| C. | both (A) and (B) |
| D. | none of the above |
| Answer» C. both (A) and (B) | |
| 281. |
Energy consumption in propelling the train is required for which of the following? |
| A. | Work against the resistance to motion |
| B. | Work against gravity while moving up the gradient |
| C. | Acceleration |
| D. | All of the above |
| Answer» D. All of the above | |
| 282. |
An ideal traction system should have |
| A. | easy speed control |
| B. | high starting tractive effort |
| C. | equipment capable of with standing large temporary loads |
| D. | all of the above |
| Answer» D. all of the above | |
| 283. |
have maximum unbalanced forces |
| A. | Diesel shunters |
| B. | Steam locomotives |
| C. | Electric locomotives |
| D. | Diesel locomotives |
| Answer» B. Steam locomotives | |
| 284. |
Specific energy consumption is affected by which of the following factors ? |
| A. | Retardation and acceleration values |
| B. | Gradient |
| C. | Distance between stops |
| D. | All of the above |
| Answer» D. All of the above | |
| 285. |
In case of ________ free running and coasting periods are generally long. |
| A. | main-line service |
| B. | urban service |
| C. | sub-urban service |
| D. | all of the above |
| Answer» A. main-line service | |
| 286. |
Overhead lines for power supply to tramcars are at a minimum height of |
| A. | 3 m |
| B. | 6 m |
| C. | 10 m |
| D. | tO m |
| Answer» C. 10 m | |
| 287. |
The return circuit for tramcars is through |
| A. | neutral wire |
| B. | rails |
| C. | cables |
| D. | common earthing |
| Answer» B. rails | |
| 288. |
_______ frequency is not common in low frequency traction system |
| A. | 40 Hz |
| B. | 25 Hz |
| C. | 16 Hz |
| D. | all |
| Answer» A. 40 Hz | |
| 289. |
For 25 kV single phase system power supply frequency is |
| A. | 60 Hz |
| B. | 50 Hz |
| C. | 25 Hz |
| D. | 16 Hz |
| Answer» B. 50 Hz | |
| 290. |
Power for lighting in passanger coach, in a long distance electric train, is provided |
| A. | directly through overhead electric line |
| B. | through individual generator of bogie and batteries |
| C. | through rails |
| D. | through locomotive |
| Answer» B. through individual generator of bogie and batteries | |
| 291. |
In India, electrification of railway track was done for the first time in which of the following years ? |
| A. | 1820—1825 |
| B. | 1880—1885 |
| C. | 1925—1932 |
| D. | 1947—1954 |
| Answer» C. 1925—1932 | |
| 292. |
Which of the following happens in Kando system ? |
| A. | Three phase A.C. is converted into D.C. |
| B. | Single phase A |
| C. | is converted into |
| D. | C. |
| Answer» C. is converted into | |
| 293. |
For which of the following locomotives the maintenance requirements are the least? |
| A. | Steam locomotives |
| B. | Diesel locomotives |
| C. | Electric locomotives |
| D. | Equal in all of the above |
| Answer» B. Diesel locomotives | |
| 294. |
Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction ? |
| A. | Reduced current method |
| B. | Tap changing control of transformer |
| C. | Series parallel operation of motors |
| D. | All of the above |
| Answer» B. Tap changing control of transformer | |
| 295. |
The most suitable servo-motor application is __________ |
| A. | AC series motor |
| B. | DC series motor |
| C. | AC two-phase induction motor |
| D. | DC shunt motor |
| Answer» D. DC shunt motor | |
| 296. |
the value of the frequency of the DC supply. |
| A. | 0 Hz |
| B. | 50 Hz |
| C. | 20 Hz |
| D. | 10 Hz |
| Answer» A. 0 Hz | |
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