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
1301. In any network containing more than one sources of e.m.f. the current in any branch is the algebraic sum of a number of individual fictitious currents (the number being equal to the number of sources of e.m.f.), each of which is due to separate action of each source of e.m.f., taken in order, when the remaining sources of e.m.f. are replaced by conductors, the resistances of which are equal to the internal resistances of the respective sources. The above statement is associated with:
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A. None of the above

B. Thevenins theorem

C. Superposition theorem

D. Nortons theorem

1302. power plant is expected to have the longest life?
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A. Diesel

B. Any of the above

C. Hydroelectric

D. Steam

1303. Following power plant has instant starting?
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A. nuclear power plant

B. hydro power plant

C. diesel power plant

D. both B and C

E. none of the above

1304. For maximum transfer of power, internal resistance of the source should be_____________?
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A. none of the above

B. greater than the load resistance

C. less than the load resistance

D. equal to load resistance
1305. Which of the following losses is not dissipated by the stator core surface in a synchronous motor?
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A. Iron losses in the stator

B. Eddy current losses in the conductors

C. Copper losses in the slot portion of the conductors

D. Windage losses

E. None of the above

1306. An induction motor has relatively high power factor at__________?
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A. near full load

B. rated r.p.m.

C. no load

D. 20 percent load

1307. Ships are generally powered by___________?
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A. none of the above

B. hydraulic turbines

C. nuclear power plants

D. diesel engines

E. steam accumulators

1308. __________ is invariably used for peak load
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A. Steam turbine plant

B. None of the above

C. Pumped storage plant

D. Nuclear power plant

1309. The period of a sine wave is _____ seconds. Its frequency is
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A. 20 Hz

B. 40 Hz

C. 30 Hz

D. 50 Hz
1310. Direct conversion of heat into electric power is possible through__________?
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A. batteries

B. thermionic converter

C. all of the above

D. fuel cell

1311. For a diesel generating station the useful life is expected to be around_________Years?
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A. 50 to 75 years

B. 75 to 100 years

C. 15 to 20 years

D. 20 to 50 years

1312. In a 3-phase synchronous motor, the negative phase sequence exists when the motor is_______________?
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A. none of the above

B. under-loaded

C. over-loaded

D. supplied with unbalanced voltage
1313. Any number of current sources in parallel may be replaced by a single current source whose current is the algebraic sum of individual source currents and source resistance is the parallel combination of individual source resistances. This statement is associated with:
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A. Thevenins theorem

B. None of the above

C. Millmans theorem

D. Maximum power transfer theorem

1314. If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will__________?
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A. function as static condenser

B. stop

C. burn with dense smoke

D. run as induction motor

1315. For the same peak value which of the following wave will have the highest r.m.s. value?
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A. half wave rectified sine wave

B. triangular wave

C. sine wave

D. square wave
1316. Efficiency of power transfer when maximum transfer of power c xerosis
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A. 75%

B. 100%

C. 50%

D. 80%

1317. A nuclear power plant is invariably used as a__________?
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A. any of the above

B. peak load plant

C. stand-by plant

D. base load plant

E. spinning reserve plant

1318. In _________ fuel transportation cost is least.
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A. nuclear power plants

B. None

C. steam power stations

D. diesel generating plants

1319. A pilot exciter is provided on generators for which of the following reasons?
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A. To provide requisite starting torque to generator

B. To excite the poles of main exciter

C. To provide requisite starting torque to main exciter

D. None of the above

1320. A synchronous motor which works on a leading power factor and does not drive a mechanical load is called as_________?
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A. synchronous condenser

B. static condenser

C. condenser

D. none of the above

1321. Which of the following is not an operating cost?
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A. Maintenance cost

B. Fuel cost

C. Salaries of high officials

D. Salaries of operating staff

1322. The load factor of domestic load is usually____________?
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A. 30 to 40%

B. 60 to 70%

C. 50 to 60%

D. 10 to 15%
1323. A closed path made by several branches of the network is known as____________?
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A. loop

B. branch

C. junction

D. circuit

1324. In a synchronous motor running with fixed excitation, when the load is increased three times, its torque angle becomes approximately
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A. six times

B. one-third

C. nine times

D. thrice

E. twice

1325. Annual depreciation cost is calculated by___________?
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A. sinking fund method

B. straight line method

C. both A. and B.

D. none of the above

1326. When the excitation of an unloaded salient pole synchronous motor suddenly gets disconnected______________?
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A. the motor stops

B. none of the above

C. it runs as a reluctance motor at a lower speed

D. it runs as a reluctance motor at the same speed

1327. The efficiency of a properly designed synchronous motor will usually fall in range___________?
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A. 99 to 99.5%

B. 60 to 70%

C. 75 to 80%

D. 85 to 95%
1328. During the commutation period in 3 phase converter, overlap time is____________?
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A. Dependent on the load current

B. Dependent on the voltage

C. Dependent on both the load current and load voltage behind the short circuit current

D. Independent on both the load current and load voltage

1329. The resistance LM will be____________?
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A. 6.66 Q

B. 20Q

C. 18Q

D. 12 Q

1330. For a power plant which of the following constitutes running cost?
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A. Cost of fuel

B. Cost of wages

C. Cost of lubricants

D. All of the above
1331. Which of the following power plants need the least period for installation ?
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A. Hydro-electric power plant

B. Nuclear power plant

C. Diesel power plant

D. Thermal power plant

1332. When the demand of consumers is not met by a power plant, it will resort to which of the following?
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A. Load shedding

B. Penalising high load consumers by increasing the charges for electricity

C. Efficient plant operation

D. Power factor improvement at the , generators

1333. Thevenin resistance Rth is found
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A. by short-circuiting the given two terminals

B. between any two open terminals

C. by removing voltage sources along with their internal resistances

D. between same open terminals as for Etk
1334. Most efficient plants are normally used as____________?
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A. base load plants

B. either A. or (b)

C. none of the above

D. peak load plants

1335. For a consumer the most economical power factor is generally____________?
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A. 0.5 leading

B. 0.95 lagging

C. 0.5 lagging

D. 0.95 leading

1336. Which of the following is not necessarily an advantage of interconnecting various power stations?
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A. Reduction in total installed capacity

B. Improved frequency of power supplied

C. Increased reliability

D. Economy in operation of plants

1337. In an interconnected system, the diversity factor of the whole system:
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A. remains unchanged

B. none of the above

C. increases

D. decreases

1338. The superposition theorem is applicable to____________?
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A. linear responses only

B. none of the above

C. linear and non-linear resistors only

D. linear, non-linear and time variant responses

1339. As the load is applied to a synchronous motor, the motor takes more armature current because
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A. the rotor strengthens the rotating field casuing more motor current

B. the increased load has to take more current

C. the back e.m.f. decreases causing an increase in motor current

D. the rotor by shifting its phase backward causes motor to take more current
1340. For high efficiency of transfer of power, internal resistance of the source should be____________?
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A. none of the above

B. equal to the load resistance

C. more than the load resistance

D. less than the load resistance
1341. Which of the following equipment provides fluctuating load?
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A. Lathe machine

B. Exhaust fan

C. All of the above

D. Welding transformer
1342. _________offers the highest electric load.
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A. Vacuum cleaner

B. Washing machine

C. Television set

D. Toaster
1343. In a distribution system, in order to improve power factor, the synchronous capacitors are installed__________?
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A. none of the above

B. at the sending end

C. either A. or (b)

D. at the receiving end
1344. Load factor of a power station is generally___________?
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A. less than unity

B. equal to unity

C. equal to zero Diversity factor is always

D. more than unity

1345. The best place to install a capacitor is___________?
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A. any where

B. far away from the inductive load

C. very near to inductive load

D. across the terminals of the inductive load
1346. For the same cylinder dimensions and speed, which of the following engine will produce least power?
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A. Diesel engine

B. Petrol engine

C. Supercharged engine

D. All of the above engines will equal power

1347. A synchronous condenser is virtually which of the following?
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A. Over excited synchronous motor

B. Under excited synchronous motor

C. D.C. generator

D. Induction motor

1348. In which of the following motors the stator and rotor magnetic field rotate at the same speed?
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A. Universal motor

B. Synchronous motor

C. Induction motor

D. Reluctance motor

1349. An ideal voltage source should have______________?
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A. small value of e.m.f.

B. infinite source resistance

C. large value of e.m.f.

D. zero source resistance
1350. For high value of diversity factor, a power station of given installed capacity will be in a position to supply?
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A. neither A. nor B.

B. more number of consumers

C. less number of consumers

D. either A. or B.