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
7201. When a lead-acid battery is in fully charged condition, the color of its positive plate is__________?
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A. brown

B. none of above

C. dark grey

D. dark brown
7202. Charging a sulphated battery at high rate results in___________?
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A. all above

B. damage to separators, cell caps covers and battery case due to excessive temperature

C. warping of plates

D. boiling of electrolyte due to gassing

7203. Undercharging___________?
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A. increases specific gravity of the electrolyte

B. increases the temperature

C. reduces specific gravity of the electrolyte

D. produces excessive gassing

7204. During the charging and discharging of a nickel-iron cell____________?
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A. corrosive fumes are produced

B. its e.m.f. remains constant

C. water is neither formed nor absorbed

D. nickel hydroxide remains unsplit

7205. The storage battery generally used in electric power station is__________?
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A. lead-acid battery

B. nickel-cadmium battery

C. zinc-carbon battery

D. none of the above

7206. Satellite power requirement is provided through________?
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A. dry cells

B. solar cells

C. nickel-cadmium cells

D. lead-acid batteries

7207. During the idle period of the battery, strong electrolyte tends to change the active material of the cell into____________?
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A. PbO

B. PbSC-4

C. Pb02

D. Pb

7208. Electrolyte used in an Edison cell is___________?
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A. HN03

B. NaOH

C. HC1

D. KOH
7209. Which of the following cell has a. reversible chemical reaction ___________?
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A. Carbon-zinc

B. Silver-oxide

C. Mercury oxide

D. Lead-acid
7210. Which of the following primary cells has the lowest voltage_________ ?
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A. Lithium

B. Zinc-chloride

C. Mercury

D. Carbon-zinc

7211. In a lead-acid battery the energy is stored in the form of___________?
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A. chemical energy

B. electromagnetic energy

C. charged ions

D. electrostatic energy

7212. A battery of 6 cells will show a drop of _______ volts from fully charged state to fully discharged state
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A. 1

B. 2.4

C. 2.9

D. 1.5

7213. A constant-voltage generator has___________?
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A. low internal resistance

B. high internal resistance

C. minimum efficiency

D. minimum current capacity

7214. In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following__________?
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A. one part H2O, three parts H2SO4

B. three parts H2O, one part H2SO4

C. all H2S04

D. two parts H2O, two parts H2SO4

7215. The common impurity in the electrolyte of lead-acid battery is_____________?
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A. chlorine

B. dust particles

C. lead crystals

D. iron
7216. The capacity of a lead-acid cell does not depend on its___________?
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A. rate of charge

B. temperature

C. quantity of active material

D. rate of discharge

7217. Battery container should be acid resistance, therefore it is made up of___________?
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A. glass

B. wood

C. all above

D. plastic

7218. Which of the following is the voltage for single phase A.C. system ?
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A. 22 V

B. None of the above

C. 5 kV

D. 440 V

E. 15 kV

7219. An ideal traction system should have_______________?
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A. all of the above

B. high starting tractive effort

C. easy speed control

D. equipment capable of with standing large temporary loads

7220. Which of the following drives is suitable for mines where explosive gas exists ?
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A. Steam engine

B. Battery locomotive

C. Diesel engine

D. Any of the above

7221. The return circuit for tramcars is through_______________?
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A. rails

B. common earthing

C. neutral wire

D. cables

7222. Battery operated trucks are used in________________?
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A. factories for material transportation

B. steel mills

C. power stations

D. narrow gauge traction

7223. Main traction systems used in India are, those using______________?
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A. electric locomotives

B. steam engine locomotives

C. diesel electric locomotives

D. diesel engine locomotives

E. all of the above
7224. The normal value of adhesion friction is______________?
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A. 0.75

B. 0.25

C. 0.12

D. 0.4

7225. For diesel locomotives the range of horsepower is_______________?
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A. 50 to 200

B. 500 to 1000

C. 1500 to 2500

D. 3000 to 5000

7226. Locomotives with monometer bogies have_________________?
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A. low co-efficient of adhesion

B. uneven distribution of tractive effect

C. lot of skidding

D. suitability for passanger as well as freight service
7227. Series motor is not suited for traction duty due to which of the following account ?
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A. Current surges after temporary switching off supply

B. Self relieving property

C. Commutating property at heavy load

D. Less current drain on the heavy load torque

7228. The rate of acceleration on suburban orurban services is restricted by the consideration of______________?
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A. Passenger Discomfort

B. Track size

C. Track curves

D. Engine power

7229. The wheels of a train, engine as well as bogies, are slightly tapered to_____________?
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A. facilitate in taking turns

B. facilitate braking

C. reduce friction

D. increase friction

7230. Quadrilateral speed-time curve pertains to which of the following services ?
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A. Sub-urban service

B. Main line service

C. Urban and sub-urban service

D. Urban service

7231. Which of the following is the disadvantage of electric traction over other systems of traction ?
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A. Interference with communication lines

B. All of the above

C. Short time power failure interrupts traffic for hours

D. Corrosion problems in the under-ground pipe work

E. High capital outlay in fixed installations beside route limitation
7232. Which of the following is the advantage of electric braking ?
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A. Motor continues to remain loaded during braking

B. It is instantaneous

C. More heat is generated during braking

D. It avoids wear of track
7233. Co-efficient of adhesion reduces due to the presence of which of the following ?
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A. Sand on rails

B. Dew on rails

C. Oil on the rails

D. both B. and C.
7234. The value of co-efficient of adhesion will be high when rails are_________________?
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A. wet

B. sprayed with oil

C. cleaned with sand

D. greased

7235. In case of _________________ free running and coasting periods are generally long ?
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A. main-line service

B. all of the above

C. urban service

D. sub-urban service

7236. For 25 kV single phase system power supply frequency is_______________?
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A. 25 Hz

B. 50 Hz

C. 60 Hz

D. 16 Hz

7237. For given maximum axle load tractive efforts of AC. locomotive will be_____________?
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A. none of the above

B. more than that of D.C. locomotive

C. equal to that of D.C. locomotive

D. less than that of D.C. locomotive

7238. Which of the following is an advantage of electric traction over other methods of traction ?
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A. Faster acceleration

B. Better braking action

C. No pollution problems

D. All of the above

7239. The resistance encountered by a train in motion is on account of_________________?
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A. friction at various parts of the rolling stock

B. resistance offered by air

C. friction at the track

D. all of the above
7240. The voltage used for suburban trains in D.C. system is usually_______________?
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A. 24 V

B. 600 to 750 V

C. 12 V

D. 220 V

7241. Speed-time curve of main line service differs from those of urban and suburban services on following account_______________?
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A. it has longer coasting period

B. it has longer free running period

C. all of the above

D. accelerating and braking periods are comparatively smaller

7242. Which of the following braking systems on the locomotives is costly ?
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A. Regenerative braking on electric locomotives

B. Vacuum braking on diesel locomotives

C. All braking systems are equally costly

D. Vacuum braking on steam locomotives

7243. Tractive effort is required to_____________?
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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
7244. Specific energy consumption is least in ________________ service?
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A. urban

B. main line

C. suburban

7245. Specific energy consumption is affected by which of the following factors ?
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A. Distance between stops

B. Gradient

C. Retardation and acceleration values

D. All of the above
7246. Electric locomotives in India are manufactured at______________?
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A. Gorakhpur

B. Jamalpur

C. Bangalore

D. Chittranjan
7247. Overload capacity of diesel engines is usually restricted to_______________?
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A. 20 percent

B. 2 percent

C. 10 percent

D. 40 percent

7248. Which of the following state capitals is not on broad gauge track ?
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A. Lucknow

B. Chandigarh

C. Jaipur

D. Bhopal

7249. In case of locomotives the tractive power is provided by______________?
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A. single cylinder double acting steam engine

B. single stage steam turbine

C. double cylinder, single acting steam engine

D. double cylinder, double acting steam engine
7250. For three-phase induction motors which of the following is the least efficient method of speed control ?
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A. Cascade control

B. Rheostat control

C. Pole changing

D. Combination of cascade and pole changing