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
1251. The expected useful life of an hydroelectric power station is around_________________?
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A. 60 years

B. 15 years

C. 30 years

D. 100 years
1252. An ideal voltage source has__________?
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A. zero internal resistance

B. open circuit voltage equal to the voltage on full load

C. terminal voltage in proportion to current

D. terminal voltage in proportion to load

1253. Different generating stations use following prime movers?
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A. hydraulic turbine

B. any of the above

C. steam turbine

D. diesel engine

E. gas turbine

1254. Synchronsizing power of a synchronous machine is_____________?
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A. inversely proportional to the synchronous reactance

B. equal to the synchronous reactance

C. direcly proportional to the synchronous reactance

D. none of the above

1255. A synchronous motor can be used as a synchronous capacitor when it is____________?
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A. under-loaded

B. over-excited

C. under-excited

D. over-loaded

1256. In power plants insurance cover is provided for which of the following?
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A. Equipment only

B. All of the above

C. Skilled workers only

D. Unskilled workers only

1257. The connected load of a IVMIM uir consumer is around___________?
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A. 80 kW

B. 120 kW

C. 5 kW

D. 40 kV

1258. AC power in a load can be controlled by using_____________?
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A. two SCRs in parallel opposition

B. four SCRs in series

C. three SCRs in series

D. two SCRs in series

1259. The increased load during summer months is due to____________?
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A. none of the above

B. increased use of fans and air conditioners

C. increased business activity

D. increased water supply

1260. Load curve of a power plant has always____________?
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A. negative slope

B. All of these

C. zero slope

D. positive slope

1261. An over excited synchronous motor on no load is known as__________?
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A. synchronous condenser

B. generator

C. induction motor

D. alternator

1262. In two part tariff, variation in load factor will affect____________?
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A. fixed charges

B. operating or running charges

C. both A. and (b)

D. either A. or (b)

1263. Which of the following are not repayable after a stipulated period?
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A. Shares

B. Cash certificates

C. Bonds

D. Fixed deposits

1264. Superposition theorem can be applied only to circuits having____________?
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A. resistive elements

B. passive elements

C. linear bilateral elements

D. non-linear elements

1265. Which lightening stroke is most dangerous?
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A. Indirect stroke on conductor

B. Direct stroke on tower top

C. Direct stroke on line conductor

D. Direct stroke on ground wire

1266. To limit the operating temperature an electrical machine should have proper____________?
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A. power factor

B. voltage rating

C. current rating

D. speed

1267. The efficiency of a plant is of least concern when it is selected as___________?
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A. casual run plant

B. peak load plant

C. base load plant

D. either A. or (b)
1268. The switching function of semiconductor devices can be characterized with____________?
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A. Frequency only

B. Duty ratio and frequency

C. Duty ratio only

D. Duty ratio, frequency and time delay
1269. The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as___________?
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A. none of the above

B. pull-up torque

C. pull-in torque

D. pull-out torque

1270. Which of the following is non-linear circuit parameter?
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A. Transistor

B. Wire wound resistor

C. Inductance

D. Condenser

1271. The effects of EMI can be reduced by_____________?
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A. All of these

B. Reducing the susceptibility of the receptor

C. Suppressing emissions

D. Reducing the efficiency of the coupling path

1272. If resistance across LM in Fig. 2.30 is 15 ohms, the value of R is____________?
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A. 30 Q

B. 10 Q

C. 40 Q

D. 20 Q

1273. The primary reason for low power factor is supply system is due to installation of____________?
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A. d.c. motors

B. single phase motors

C. synchronous motors

D. induction motors
1274. In a synchronous motor, the armature current has large values for____________?
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A. high excitation only

B. low excitation only

C. both high and low excitation

D. none of the above

1275. The construction of a synchronous motor resembles____________?
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A. an induction motor

B. an alternator

C. a rotary converter

D. a series motor

1276. Slip rings are usually made of__________?
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A. copper or aluminium

B. silver or gold

C. carbon or graphite

D. brass or steel
1277. Synchronous motor always runs at______________?
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A. less than synchronous speed

B. the synchronous speed

C. more than synchronous speed

D. none of the above

1278. Kirchhoff s law is not applicable to circuits with____________?
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A. lumped parameters

B. non-linear resistances

C. distributed parameters

D. passive elements

1279. Load curve is useful in deciding the_____________?
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A. sizes of generating units

B. all of the above

C. operating schedule of generating units

D. total installed capacity of the plant

1280. In which of the following motors the stator and rotor fields rotate simultaneously?
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A. Universal motor

B. D.C. motor

C. Induction motor

D. Reluctance motor

E. Synchronous motor
1281. Application of Nortons theorem to a circuit yields:________________?
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A. equivalent current source and impedance in parallel

B. equivalent current source and impedance in series

C. equivalent impedance

D. equivalent current source

1282. Which of the following losses, in a synchronous motor, does not vary with load?
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A. Windage loss

B. Any of the above

C. Copper losses

D. None of the above

1283. A passive network is one which contains____________?
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A. only variable resistances

B. only two sources of e.m.f. in it

C. only some sources of e.m.f. in it

D. no source of e.m.f. in it
1284. When the voltage applied to a synchronous motor is increased, which of the following will reduce?
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A. Stator flux

B. Pull in torque

C. Both A. and (b)

D. None of the above
1285. In a power plant if the maximum demand on the plant is equal to the plant capacity, then
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A. diversity factor will be unity

B. load factor will be unity

C. plant reserve capacity will be zero

D. load factor will be nearly 60%

1286. __________ industry has the least power consumption per ton of product?
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A. Soap

B. Sugar

C. Caustic soda

D. Vegetable oil
1287. Power factor of an inductive circuit is usually improved by connecting capacitor to it in____________?
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A. parallel

B. either A. or (b)

C. series

D. none of the above

1288. High load factor indicates
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A. average power used during the period

B. either of the above

C. none of the above

D. average kWh (kW) energy consumption during the period
1289. A synchronous motor installed at the receiving end substation operates with such an excitation that it takes power at lagging power factor. Now if the applied voltage of the synchronous motor goes down, the power factor of the synchronous motor will___________?
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A. none of the above

B. remain same

C. improve

D. go down

1290. The superposition theorem requires as many circuits to be solved as there are____________?
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A. sources

B. sources, nodes and meshes

C. nodes

D. sources and nodes

1291. All the rules and laws of D.C. circuit also apply to A.C. circuit containing_____________?
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A. all above

B. resistance only

C. capacitance only

D. inductance only

1292. For a voltage source:
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A. None

B. the source e.m.f. and terminal voltage are equal

C. terminal voltage cannot be higher than source e.m.f.

D. terminal voltage is always lower than source e.m.f.

1293. A synchronous machine with low value of short-circuit ratio has___________?
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A. good speed regulation

B. high stability limit

C. lower stability limit

D. good voltage regulation

E. none of the above

1294. Large capacity generators are invariably___________?
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A. forced air cooled

B. water cooled

C. natural air cooled

D. hydrogen cooled
1295. For which of the following power plants highly skilled engineers are required for running the plants?
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A. Solar power plants

B. Nuclear power plants

C. Gas turbine power plants

D. Hydro-electric power plants

1296. Which of the following is the essential requirement of peak load plant ?
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A. It should run at high speed

B. It should be capable of starting quickly

C. It should produce high voltage

D. It should be small in size

1297. An SCR is made up of silicon because_____________?
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A. silicon has large leakage voltage than germanium

B. silicon has large leakage current than germanium

C. silicon has small leakage voltage than germanium

D. silicon has small leakage current than germanium
1298. The shaft of synchronous motor is made of____________?
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A. alnico

B. mild steel

C. stainless steel

D. chrome steel

1299. Annual operating expenditure of a power plant consists of____________?
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A. semi-fixed charges

B. running charges

C. fixed charges

D. all of the above
1300. Diversity factor has direct effect on the____________?
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A. fixed cost of unit generated

B. running cost of unit generated

C. both A. and B.

D. neither A. nor B.