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
3201. Reluctance motor is a________________?
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A. low torque variable speed motor

B. variable torque motor

C. self starting type synchronous motor

D. low noise, slow speed motor

3202. For crane travel which of the following motors is normally used ?
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A. D.C. differentially compound motor

B. Synchronous motor

C. Ward-Leonard controlled D.C. shunt motor

D. AC. slip ring motor
3203. Positive logic in a logic circuit is one in which______________?
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A. logic 0 and 1 are represented by 0 and positive voltage respectively

B. logic 0 voltage level is higher than logic 1 voltage level

C. logic 0 voltage level is lower than logic 1 voltage level

D. logic 0 and, -1 are represented by negative and positive voltages respectively

3204. Digital computers are more widely used as compared to analog computers, because they are______________?
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A. less expensive

B. easier to maintain

C. always more accurate and faster

D. useful over wider ranges of problem types
3205. While selecting an electric motor for a floor mill, which electrical characteristics will be of least significance ?
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A. Braking

B. Starting characteristics

C. Efficiency

D. Running characteristics

3206. A reverse bias pn junction has_____________?
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A. Almost no current

B. Very narrow depletion layer

C. Large current flow

D. Very low resistance

3207. For faithful amplification by a transistor circuit, the value of VCE should______________for silicon transistor?
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A. Be 0.2 V

B. None of the above

C. Not fall below 1 V

D. Be zero

3208. What would happen, if smaller logic modules are utilized for performing logical functions associated with FPGA? A. Propagation delay will increase B. FPGA area will increase C. Wastage of logic modules will not be prevented D. Number of interconnected paths in device will decrease ?
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A. A & D

B. B & C

C. C & D

D. A & B
3209. For faithful amplification by a transistor circuit, the value of VBE should_____________for a silicon transistor?
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A. Not fall below 0.7 V

B. Be between 0 V and 0.1 V

C. Be zero

D. Be 0.01 V

3210. 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
3211. Which mechanism allocates the binary value to the states in order to reduce the cost of the combinational circuits ?
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A. State Evaluation

B. State Assignment

C. State Minimization

D. State Reduction

3212. In an intrinsic semiconductor, the number of free electrons_____________?
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A. None of the above

B. Is greater than the number of holes

C. Equals the number of holes

D. Is less than the number of holes

3213. For which of the following locomotives the maintenance requirements are the least ?
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A. Diesel locomotives

B. Equal in all of the above

C. Electric locomotives

D. Steam locomotives

3214. The cost of an induction motor will increase as________________?
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A. horsepower rating decreases but r.p.m. increases

B. horsepower rating and operating speed increases

C. horsepower rating increases but r.p.m. decreases

D. horsepower rating and operating speed decreases

3215. The number of Boolean functions that can be generated by n variables is equal to_________________?
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A. 2n

B. 2n

C. 2n-1

D. 22 n
3216. Vacuum is created by which of the following ?
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A. Ejector

B. None of the above

C. Any of the above

D. Vacuum pump

3217. The friction at the track is proportional to________________?
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A. speed

B. 1/speed

C. l/(speed)2

D. none of the above

3218. The universal gate is ________________?
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A. OR gate

B. None of the above

C. NAND gate

D. AND gate

3219. A pony motor is used for the starting which of the following motors ?
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A. Squirel cage induction motor

B. None of the above

C. Schrage motor

D. Synchronous motor
3220. In series motor which of the following methods can be used for changing the flux per pole ?
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A. Diverter field control

B. Series-parallel control

C. Any of the above

D. Tapped field control

3221. When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on_________________?
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A. None of the above

B. Majority carriers

C. Junction capacitance

D. Minority carriers
3222. A debouncing circuit is________________?
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A. a monostable MV

B. a latch

C. an astable MV

D. a bistable MV

3223. In case of locomotives the tractive power is provided by______________?
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A. single stage steam turbine

B. single cylinder double acting steam engine

C. double cylinder, single acting steam engine

D. double cylinder, double acting steam engine
3224. 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. accelerating and braking periods are comparatively smaller

C. it has longer free running period

D. all of the above
3225. ___________________is not a part of ball bearing ?
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A. Outer race

B. Inner race

C. Cage

D. Bush
3226. The stability factor of a collector feedback bias circuit is_______________ that of base resistor bias?
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A. Less than

B. The same as

C. None of the above

D. More than

3227. Power for lighting in passanger coach, in a long distance electric train, is provided_________________?
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A. through individual generator of bogie and batteries

B. directly through overhead electric line

C. through rails

D. through locomotive

3228. have maximum unbalanced forces_______________?
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A. Diesel locomotives

B. Electric locomotives

C. Diesel shunters

D. Steam locomotives
3229. The resistivity of pure germanium under standard conditions is about_______________?
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A. 3 x 106 cm

B. 6 x 10-4 cm

C. 60 x cm

D. 6 x 104 cm

3230. At room temperature, an intrinsic semiconductor has_______________?
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A. Many holes only

B. Many free electrons only

C. A few free electrons and holes

D. No holes or free electrons

3231. In a paper mill where constant speed is required________________?
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A. A.C. motors are preferred

B. synchronous motors are preferred

C. group drive is preferred

D. individual drive is preferred
3232. Which of the following machines has heavy fluctuation of load ?
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A. Planer

B. g machine

C. Lathe

D. Punching machine

3233. For proper amplification by a transistor circuit, the operating point should be located at the_____________ of the d.c. load line?
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A. None of the above

B. Middle

C. The maximum current point

D. The end point

3234. The value of co-efficient of adhesion will be high when rails are_________________?
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A. cleaned with sand

B. wet

C. greased

D. sprayed with oil

3235. While selecting motor for an air conditioner which of the following characteristics is of great importance ?
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A. Noise

B. None of the above

C. Type of enclosure

D. Type of bearings

E. Arrangement for power transmission

3236. Indicate which of the following three binary additions are correct? 1.1011 + 1010 = 10101 II. 1010 + 1101 = 10111 ?
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A. II and III

B. . 1010 + 1101 = 11111

C. I and II

D. III only

E. II and III

3237. When a pure semiconductor is heated, its resistance_________________?
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A. Cant say

B. Goes up

C. Remains the same

D. Goes down
3238. Which type of CPLD packaging can provide maximum number of pins on the package due to small size of the pins ?
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A. BGA

B. PLCC

C. PGA

D. QFP

3239. The NAND gate is AND gate followed by_________________?
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A. None of the above

B. AND gate

C. OR gate

D. NOT gate
3240. Series motor is not suited for traction duty due to which of the following account ?
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A. Self relieving property

B. Less current drain on the heavy load torque

C. Commutating property at heavy load

D. Current surges after temporary switching off supply
3241. In which of the following applications the load on motor changes in cyclic order ?
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A. All of the above

B. Rolling mills

C. Cranes

D. Electric shovels

3242. Suri transmission is_________________?
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A. mechanical-electrical

B. hydro-pneumatic

C. hydro-mechanical

D. electrical-pneumatic

3243. In a steam locomotive electric power is provided through_____________?
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A. diesel engine generator

B. small turbo-generator

C. overhead wire

D. battery system

3244. The capacity of a crane is expressed in terms of_______________?
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A. any of the above

B. type of drive

C. tonnes

D. span

3245. A pentavalent impurity has______________Valence electrons?
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A. 4

B. 3

C. 5

D. 6

3246. The random motion of holes and free electrons due to thermal agitation is called______________?
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A. Ionisation

B. Pressure

C. Diffusion

D. None of the above

3247. Which part of a motor needs maximum attention for maintenance ?
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A. Rearing

B. Rotor winding

C. Stator winding

D. Frame

3248. The value of VBE ___________________?
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A. Is almost independent of IC

B. Depends upon IC to moderate extent

C. None of the above

D. Is strongly dependant on IC

3249. Tractive effort is required to_____________?
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A. overcome friction, windage and curve resistance

B. do all of the above

C. accelerate the train mass

D. overcome the gravity component of train mass

3250. (1(10101)2 is_______________?
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A. ( 69)10

B. (5)10

C. (37)10

D. (41 )10