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
6251. Rotor of a motor is usually supported on ___________________ bearings?
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A. ball or roller

B. needle

C. thrust

D. bush

6252. Which of the following motors is preferred for boom hoist of a travelling crane ?
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A. Single phase motor

B. Synchronous motor

C. A.C. slip ring motor

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

6253. Reluctance motor is a________________?
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A. low noise, slow speed motor

B. low torque variable speed motor

C. variable torque motor

D. self starting type synchronous motor
6254. The size of an excavator is usually expressed in terms of_________________?
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A. crowd motion

B. cubic metres

C. travel in metres

D. angle of swing

6255. Which of the following motors is preferred when smooth and precise speed control over a wide range is desired ?
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A. Squirrel cage induction motor

B. Synchronous motor

C. D.C. motor

D. Wound rotor induction motor

6256. In a paper mill where constant speed is required________________?
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A. group drive is preferred

B. individual drive is preferred

C. synchronous motors are preferred

D. A.C. motors are preferred

6257. Which of the following alternatives will be cheaper ?
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A. Five motors of 20 H.P. each

B. Four motors of 25 H.P. each

C. A 100 H.P. AC. three phase motor

D. Ten motors of 10 H.P. each

6258. Which of the following motors is preferred when quick speed reversal is the main consideration ?
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A. D.C. motor

B. Squirrel cage induction motor

C. Synchronous motor

D. Wound rotor induction motor

6259. Which of the following happens when star-delta starter is used ?
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A. Starting voltage is reduced

B. Starting current is reduced

C. Both A. and B.

D. None of the above

6260. __________________ has relatively wider range of speed control?
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A. D.C. shunt motor

B. Squirrel cage induction motor

C. Ship ring induction motor

D. Synchronous motor

6261. By the use of which of the following m D.C. can be obtained from AC. ?
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A. Mercury arc rectifier

B. Motor generator set

C. Silicon diodes

D. Any of the above
6262. In which of the following applications the load on motor changes in cyclic order ?
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A. Electric shovels

B. All of the above

C. Rolling mills

D. Cranes

6263. For blowers which of the following motor is preferred ?
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A. Squirrel cage induction motor

B. D.C. series motor

C. D.C. shunt motor

D. Wound rotor induction motor

6264. Which of the following machines has heavy fluctuation of load ?
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A. Lathe

B. Planer

C. g machine

D. Punching machine

6265. Besides a constant speed a synchronous rotor possesses which of the following advantages ?
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A. Lower cost

B. Better efficiency

C. High power factor

D. All of the above

6266. Which feature, while selecting a.motor for centrifugal pump, will be of least significance ?
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A. Operating speed

B. Horse power

C. Starting characteristics

D. Speed control
6267. Which of the following types of motor enclosure is safest ?
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A. Totally enclosed

B. Open type

C. Semi closed

D. Totally enclosed fan cooled
6268. A pony motor is used for the starting which of the following motors ?
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A. None of the above

B. Schrage motor

C. Squirel cage induction motor

D. Synchronous motor
6269. Which of the following motors is usually preferred for kiln drives ?
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A. Three phase shunt wound com-mutator motor

B. Any of the above

C. Slip ring induction motor

D. Cascade controlled A.C. motor

6270. In ________________ method of staging three phase induction motors the starting voltage is not reduced?
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A. any of the above

B. auto-transformer

C. star-delta

D. slip ring
6271. For a particular application the type of electric-and control gear are determined by which of the following considerations ?
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A. All of the above

B. Limitation on starting current

C. Speed control range and its nature

D. Conditions of environment

E. Starting torque

6272. ___________________is not a part of ball bearing ?
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A. Outer race

B. Inner race

C. Bush

D. Cage

6273. _______________has the least value of starting torque to full load torque ratio?
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A. D.C. shunt motor

B. D.C. series motor

C. Slip ring induction motor

D. Squirrel cage induction motor
6274. ___________________is preferred for synthetic fibre mills?
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A. Series motor

B. Synchronous motor

C. Shunt motor

D. Reluctance motor
6275. The travelling speed of cranes varies from_________________?
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A. 5 to 10 m/s

B. 1 to 2.5 m/s

C. 10 to 15 m/s

D. 20 to 30 m/s

6276. Which part of a motor needs maximum attention for maintenance ?
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A. Rotor winding

B. Rearing

C. Stator winding

D. Frame

6277. For derries and winches which of the following drives can be used ?
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A. A.C. slip ring motors with variable resistance

B. Pole changing squirrel cage motors

C. D.C. motors with Ward-leonard con-trol

D. Any of the above
6278. In which of the following applications variable speed operation is preferred ?
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A. Exhaust fan

B. Refrigerator

C. Ceiling fan

D. Water pump

6279. Heavy duty cranes are used in________________?
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A. all of the above

B. steel plants

C. ore handling plants

D. heavy engineering workshops

6280. Battery operated scooter for braking uses__________________?
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A. plugging

B. rheostatic braking

C. regenerative braking

D. mechanical braking
6281. For which of the following applications motor has to start with high acceleration ?
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A. Centrifugal pump

B. Oil expeller

C. Lifts and hoists

D. Floor mill

6282. Which of the following is essentially needed while selecting a motor ?
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A. Foundation pedal

B. Bearings

C. Pulley

D. Starter
6283. Flame proof motors are used in_________________?
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A. steel mills

B. explosive atmospheres

C. moist atmospheres

D. paper mills

6284. In jaw crushers a motor has to often start against ____________________ load?
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A. heavy

B. normal

C. low

D. medium

6285. Which of the following motors always starts on load ?
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A. Fan motor

B. All of the above

C. Floor mill motor

D. Conveyor motor

6286. While selecting an electric motor for a floor mill, which electrical characteristics will be of least significance ?
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A. Starting characteristics

B. Braking

C. Efficiency

D. Running characteristics

6287. The load cycle for a motor driving a power press will be________________?
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A. continuous but periodical

B. variable load

C. intermittent and variable load

D. continuous

6288. ________________is preferred for automatic drives?
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A. Ward-Leonard controlled D.C. motors

B. Any of the above

C. Squirrel cage induction motor

D. Synchronous motors

6289. Which of the following motors are pre-ferred for overhead travelling cranes ?
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A. Slow speed motors

B. Continuous duty motors

C. Short time rated motors

D. None of the above

6290. When the load is above _______________ a synchronous motor is found to be more economical?
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A. 50 kW

B. 20 kW

C. 100 kW

D. 2 kW

6291. Light duty cranes are used in which of the following ?
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A. All of the above

B. Pumping stations

C. Power houses

D. Automobile workshops

6292. Which of the following motors is preferred for traction work ?
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A. Three-phase induction motor

B. Synchronous motor

C. Universal motor

D. D.C. series motor

6293. The selection of an electric motor for any application depends on which of the following factors ?
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A. All of the above

B. Mechanical characteristics

C. Cost

D. Electrical characteristics

E. Size and rating of motors

6294. If the load factor of a power station is high then its cost of generation will be_______?
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A. High.

B. Low.

C. Depend upon plant type.

D. Remain same.

6295. Annual operating expenditure of a power plant consists of_________?
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A. running charges

B. semi-fixed charges

C. all of the above

D. fixed charges

6296. Load factor of a power station is defined as____________?
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A. average load/maximum demand

B. average load x maximum demand

C. maximum demand/average load

D. none of the above

6297. Which of the following Power Plant causes least environmental pollution____________?
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A. Hydro Power Plant

B. Thermal Power Plant

C. Diesel Power Plant

D. Nuclear Power Plant

6298. Which of the following generating station has minimum running cost?
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A. Nuclear

B. Diesel

C. Thermal

D. Hydro
6299. Which of the following is usually not the generating voltage__________?
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A. 9.9 kV

B. 11kV

C. 6.6 kV

D. 13.2kV

6300. At low value of power factor, the cost of generation of a power station will be____________?
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A. low

B. high

C. none of the above

D. remain same