electrical engineering Mcqs
1. economics of power generation2. analog electronics3. solid state switching circuits4. parallel circuits5. switchgear and protection6. op amp circuits7. transistor audio power amplifiers8. electrostatics9. heating and welding10. multi stage transistor amplifiers11. passive filters12. network theorems13. regulated d c power supply14. a c fundamentals circuits and circuit theory15. electromagnetic induction16. power electronics17. magnetism and electromagnetism18. transformers19. modulation and demodulation20. d c generators21. semiconductor theory22. single phase induction motors23. semiconductor diode24. hybrid parameters25. digital electronics26. oscillators27. earthing or grounding28. single stage transistor amplifiers29. d c motors30. transistor biasing31. amplifiers with negative feedback32. basic electrical33. electronic instruments34. synchronous motors35. field effect transistors fet36. magnetic circuit37. control systems38. industrial drives39. power generation40. series parallel circuits41. transistor tuned amplifiers42. electrical engineering materials43. rectifiers and converters44. integrated circuits45. scr silicon controlled rectifiers46. cables47. polyphase induction motors48. measurement and instrumentation49. transistors50. electrical machine design51. electrolysis and storage of batteries52. electric traction53. transmission and distribution
7251. In case of steam engines the steam pressure is_______________?
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A. 10 to 15 kgf/cm2

B. 1 to 4 kgf/cm2

C. 25 to 35 kgf/cm2

D. 5 to 8 kgf/cm2

7252. The pulsating torque exerted by steam locomotives causes which of the following ?
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A. All of the above

B. Jolting and skidding

C. Hammer blow

D. Pitching

7253. Locomotive having monomotor bogies________________?
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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
7254. Energy consumption in propelling the train is required for which of the following?
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A. Acceleration

B. Work against gravity while moving up the gradient

C. Work against the resistance to motion

D. All of the above
7255. The steam engine provided on steam locomotives is____________?
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A. single acting non-condensing type

B. double acting non-condensing type

C. double acting condensing type

D. single acting condensing type

7256. Specific energy consumption becomes________________?
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A. more with high train resistance

B. less if distance between stops is more

C. more on steeper gradient

D. all of the above
7257. The speed of a locomotive is controlled by_______________?
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A. regulating steam flow to engine

B. flywheel

C. gear box

D. applying brakes 11.

7258. The number of passenger coaches that can be attached to a diesel engine locomotive on broad gauge is usually restricted to_____________/
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A. 10

B. 17

C. 14

D. 5

7259. When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when_______________?
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A. wheel base of axles is more

B. degree of curvature is more

C. both A. and B.

D. none of the above

7260. The friction at the track is proportional to________________?
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A. 1/speed

B. speed

C. none of the above

D. l/(speed)2

7261. In tramways which of the following motors is used ?
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A. A.C. three phase motor

B. D.C. series motor

C. D.C. shunt motor

D. AC. single phase capacitor start motor

7262. _______________method can bring the locomotive to dead stop?
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A. Plugging braking

B. None of the above

C. Rheostatic braking

D. Regenerative braking

7263. Automatic signalling is used for which of the following trains ?
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A. Mail and express trains

B. Superfast trains

C. All trains

D. Suburban and Urban electric trains

7264. In a steam locomotive electric power is provided through_____________?
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A. diesel engine generator

B. overhead wire

C. battery system

D. small turbo-generator
7265. The speed of a superfast train is______________?
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A. more than 100 kmph

B. 75 kmph

C. 60 kmph

D. 100 kmph

7266. The horsepower of steam locomotives is______________?
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A. 1500 to 2000

B. 3000 to 4000

C. up to 1500

D. 2000 to 3000

7267. The efficiency of diesel locomotives is nearly_______________?
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A. 20 to 25 percent

B. 30 to 40 percent

C. 45 to 55 percent

D. 60 to 70 percent

7268. Overhead lines for power supply to tramcars are at a minimum height of______________?
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A. 3 m

B. 6 m

C. 10 m

D. 15 m

7269. have maximum unbalanced forces_______________?
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A. Electric locomotives

B. Diesel shunters

C. Steam locomotives

D. Diesel locomotives

7270. In main line service as compared to urban and suburban service______________?
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A. all of the above

B. distance between the stops is more

C. acceleration and retardation rates are low

D. maximum speed reached is high

7271. ________________ frequency is not common in low frequency traction system?
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A. 16 Hz

B. 40 Hz

C. 25 Hz

D. non of these

7272. The overall efficiency of steam locomotive is around_____________?
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A. 5 to 10 percent

B. 35 to 45 percent

C. 25 to 35 percent

D. 15 to 20 percent

7273. Which of the following braking systems is used on steam locomotives ?
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A. Vacuum system

B. Hydraulic system

C. Pneumatic system

D. None of the above

7274. Due to which of the following co-efficient of adhesion improves ?
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A. All of the above

B. Dust on the rails

C. Rust on the rails

D. Sand on the rails

7275. The specific energy consumption of a train depends on which of the following ?
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A. Gradient

B. All of the above

C. e covered

D. Acceleration and retardation

7276. _________ locomotive has the highest operational availability?
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A. Steam

B. Electric

C. Diesel

7277. Co-efficient of adhesion is________________-?
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A. high in case of D.C. traction than in the case of AC. traction

B. low in case of D.C. traction than in the case of AC. traction

C. equal in both AC. and D.C. traction

D. any of the above

7278. The air resistance to the movement of the train is proportional to_____________?
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A. (speed)

B. speed

C. 1/speed

D. (speed)
7279. Vacuum is created by which of the following ?
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A. Ejector

B. Any of the above

C. Vacuum pump

D. None of the above

7280. Long distance railways use which of the following ?
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A. 25 kV three phase A.C.

B. 25 kV single phase A.C.

C. 25 kV two phase A.C.

D. 200 V D.C.

7281. Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction ?
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A. All of the above

B. Series parallel operation of motors

C. Reduced current method

D. Tap changing control of transformer
7282. If the co-efficient of adhesion on dry rails is 0.26, which of the following could be the value for wet rails ?
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A. 0.225

B. 0.26

C. 0.16

D. 0.3

7283. The braking retardation is usually in the range__________________?
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A. 10 to 15 km phps

B. 0.15 to 0.30 km phps

C. 3 to 5 km phps

D. 0.6 to 2.4 km phps

E. 0.30 to 0.6 km phps

7284. For which of the following locomotives the maintenance requirements are the least ?
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A. Steam locomotives

B. Electric locomotives

C. Equal in all of the above

D. Diesel locomotives
7285. Power for lighting in passanger coach, in a long distance electric train, is provided_________________?
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A. through rails

B. through locomotive

C. through individual generator of bogie and batteries

D. directly through overhead electric line

7286. _______________watt-hours per tonne km is usually the specific energy consumption for suburban services?
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A. 5075

B. 1520

C. 120150

D. 160200

7287. Which of the following happens in Kando system ?
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A. Single phase supply is converted into three phase system

B. Three phase A.C. is converted into D.C.

C. None of the above

D. Single phase A.C. is converted into D.C.

7288. The rate of acceleration on suburban orurban service is in the range_________________?
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A. 0.2 to 0.5 km phps

B. 1.6 to 4.0 km phps

C. 15 to 25 km phps

D. 5 to 10 km phps

7289. The coasting retardation is around_________________?
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A. 1.6 km phps

B. 0.16 km phps

C. 16 km phps

D. 40 km phps

7290. Suri transmission is_________________?
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A. hydro-pneumatic

B. mechanical-electrical

C. electrical-pneumatic

D. hydro-mechanical
7291. In case of a steam engine an average coal consumption per km is nearly________________?
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A. 28 to 30 kg

B. 150 to 175 kg

C. 100 to 120 kg

D. 60 to 80 kg

7292. Which of the following D.C. distribution system is the simplest and lowest in first cost ?
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A. Radial system

B. Inter-connected system

C. Ring system

D. None of the above

7293. A conductor, due to sag between two supports, takes the form of____________?
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A. ellipse

B. triangle

C. catenary

D. semi-circle

7294. The phenomenon qf rise in voltage at the receiving end of the open-circuited or lightly loaded line is called the________________?
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A. none of the above

B. Seeback effect

C. Ferranti effect

D. Raman effect

7295. Galvanised steel wire is generally used as______________?
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A. all of the above

B. stay wire

C. earth wire

D. structural components

7296. Which of the following materials is used for overhead transmission lines ?
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A. Any of the above

B. Cadmium copper

C. Galvanised steel

D. Steel cored aluminium

7297. The use of strain type insulators is made where the conductors are__________?
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A. at intermediate anchor towers

B. any of the above

C. dead ended

D. none of the above

7298. Which of the following bus-bar schemes has the lowest cost?
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A. Ring bus-bar scheme

B. Single bus-bar scheme

C. Main and transfer scheme

D. Breaker and a half scheme

7299. The material generally used for armour of high voltage cables is_____________?
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A. aluminium

B. brass

C. steel

D. copper

7300. Multicore cables generally use________________?
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A. sector-shaped conductors

B. rectangular conductors

C. circular conductors

D. square conductors

E. none of the above