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
1451. The power factor at resonance in R-L- C parallel circuit is________?
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A. unity

B. zero

C. 0.8 leading

D. 0.08 lagging

1452. Self charge of a Ni-Fe cell is _______ Edison cell
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A. much more than

B. less than

C. equal to

D. more than

1453. For a sine wave with peak value Imax the r.m.s. value is_______?
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A. 0.5 Imax

B. 0.707

C. 1.414 Lmax

D. 0.9

1454. The thickness of metallic shielding on cables is usually_______________?
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A. 3 to 5 mm

B. 0.04 mm

C. 40 to 60 mm

D. 0.2 to 0.4 mm

1455. Polyethylene has very poor dielectric and ageing properties
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A. No

B. Yes

1456. ______ of electrolyte indicates the state of charge of the battery
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A. colour

B. specific gravity

C. viscosity

D. mass

1457. 48 ampere-hour capacity would deliver a current of___________?
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A. 48 amperes for 1 hour

B. 8 amperes for 6 hours

C. 24 amperes for 2 hours

D. 6 amperes for 8 hours
1458. Capacity of dry cells is_________?
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A. more when it is supplying current for continuous periods

B. unaffected by the type of discharge

C. more when it is supplying current for intermittent periods

D. none of the above

1459. The active materials of a nickel-iron battery are___________?
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A. 21% solution of KOH

B. nickel hydroxide

C. powdered iron and its oxide

D. all of the above
1460. The series and parallel resonance on L-C circuit differs in that_________?
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A. parallel resonance needs a low-resistance source for a sharp rise in line current

B. parallel resonance needs a low-resistance source for a sharp increase in impedance

C. series resistance needs a low-resistance source for sharp rise in current

D. series resonance needs a high-resistance source for sharp increase in current

1461. Two waves of the same frequency have opposite phase when the phase angle between them is_________?
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A. 360

B. 180

C. 90

D. 0

1462. When an alternating current passes through an ohmic resistance the electrical power converted into heat is__________?
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A. true power

B. reactive power

C. apparent power

D. none of the above

1463. Batteries are charged by_____________?
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A. any one of the above methods

B. motor generator sets

C. engine generator sets

D. rectifiers

1464. Is a cable is to be designed for use on 1000 kV, which insulation would you prefer ____________?
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A. Impregnated paper

B. none of the above

C. Polyvinyle chloride

D. Compressed SFe gas

E. Vulcanised rubber

1465. Copper as conductor for cables is used as________?
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A. hard drawn

B. alloy with chromium

C. annealed

D. hardened and tempered

1466. In a series L-C circuit at the resonant frequency the__________?
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A. current is maximum

B. impedance is maximum

C. voltage across C is minimum

D. current is minimum

1467. The charge required to liberate one gram equivalent of any substance is known as _________ constant
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A. time

B. Faradays

C. Boltzman

1468. The voltage of domestic supply is 220V. This figure represents__________?
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A. r.m.s. value

B. mean value

C. peak value

D. average value

1469. Local action in a battery is indicated by____________?
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A. excessive gassing under load conditions

B. excessive drop in the specific gravity of electrolyte even when the cell is on open circuit

C. both A. and (b)

D. none of the above
1470. The effect of sulphation is that the internal resistance__________?
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A. none of the above

B. decreases

C. increases

D. remains same

1471. The ratio of active power to apparent power is known as factor__________?
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A. power

B. demand

C. load

D. form

1472. In a highly capacitive circuit the__________?
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A. reactive power is more than the actual power

B. reactive power is more than the apparent power

C. apparent power is equal to the actual power

D. actual power is more than its reactive power

1473. The e.m.f. of an Edison cell, when fully charged, is nearly______________?
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A. 0.8 V

B. 1 V

C. 1.4 V

D. 0.9 V

1474. Which of the following insulation is used in cables ?
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A. Varnished cambric

B. Any of the above

C. Paper

D. Rubber

1475. Life of the Edison cell is at least_____________?
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A. five years

B. ten years

C. seven years

D. eight years

1476. Poor power factor________?
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A. results in more voltage drop in the line

B. reduces load handling capability of electrical system

C. results in all above

D. overloads alternators, transformers and distribution lines

E. results in more power losses in the electrical system

1477. The intersheaths in the cables are used to_____________?
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A. avoid the requirement of good insulation

B. provide proper stress distribution

C. minimize the stress

D. none of the above

1478. In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value__________?
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A. will increase the selectivity of the circuit

B. will change the maximum value of current at resonance

C. will change the resonance frequency

D. will change the impedance at resonance frequency

1479. For a sine wave with peak value Emax _______ 8.30. the average value is?
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A. 0.434 EWc

B. 0.636 Emax

C. 0.707 Emax

D. lAUEmax

1480. The insulating material for a cable should have__________?
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A. high dielectric strength

B. high mechanical strength

C. all of the above

D. low cost

1481. In a circuit containing R, L and C, power loss can take place in____________?
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A. L only

B. C only

C. all above

D. R only
1482. High tension cables are generally used up to_____________?
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A. 132 kV

B. 66 kV

C. 33kV

D. 11kV
1483. Following will happen if battery charging rate is too high______________?
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A. all above will occur

B. excessive gassing will occur

C. bulging and buckling of plates will occur

D. temperature rise will occur

1484. If a lead-acid cell is discharged below 1.8 V the following will happen.____________?
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A. All above will occur

B. Sulphation of plates will occur

C. Internal resistance will increase

D. Capacity of cell will reduce

1485. The equation of 50 Hz current sine wave having r.m.s. value of 60 A is____________?
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A. 84.84 sin 3141

B. 60 sin 25 t

C. 60 sin 50 t

D. 42.42 sin 314 t

1486. In a purely inductive circuit__________?
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A. reactive power is zero

B. actual power is zero

C. apparent power is zero

D. none of above is zero

1487. The surge resistance of cable is__________?
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A. 50 ohms

B. 5 ohms

C. 100 ohms

D. 20 ohms

1488. In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will__________?
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A. be doubled

B. be reduced by half

C. be reduced to one fourth

D. be four times at high

1489. Negative plate of an Edison cell is made of__________?
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A. lead

B. copper

C. silver oxide

D. iron
1490. In a pure inductive circuit if the supply frequency is reduced to 1/2, the current will__________?
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A. be reduced by half

B. be four times as high

C. be reduced to one fourth

D. be doubled
1491. The following indicate that battery on charge has attained full charge___________?
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A. all above

B. gassing

C. specific gravity

D. colour of electrode

1492. Short circuiting of a cell may be caused____________?
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A. buckling of plates

B. lead particles forming circuit between positive and negative plates

C. any one of above

D. faulty separators

E. excessive accumulation of sediment

1493. As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its__________?
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A. compactness

B. higher internal resistance

C. lower e.m.f.

D. small quantity of electrolyte used

1494. Each cell has a vent cap________?
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A. to allow gases out when the cell is on charge

B. to check the level of electrolyte

C. to add water to the cell if needed

D. to do all above functions
1495. 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

1496. The watt-hour efficiency of a lead-acid cell varies between________?
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A. 90 to 95%

B. 40 to 60%

C. 25 to 35%

D. 70 to 80%
1497. The metallic sheath may be made of lead or lead alloy or of aluminium ?
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A. No

B. Yes

1498. The frequency of an alternating current is____________?
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A. the number of waves passing through a point in one second

B. the number of cycles generated in one minute

C. the speed with which the alternator runs

D. the number of electrons passing through a point in one second

1499. In a cable the voltage stress is maximum at____________?
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A. surface of the conductor

B. sheath

C. insulator

D. core of the conductor
1500. During the charging and discharging of a nickel-iron cell____________?
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A. nickel hydroxide remains unsplit

B. its e.m.f. remains constant

C. water is neither formed nor absorbed

D. corrosive fumes are produced