electrical engineering MCQs – Page 73

Practise multiple-choice questions from electrical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

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
1441. Which plant can never have 100 percent load factor?
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A. Nuclear power plant

B. Hydro electric plant

C. Peak load plant

D. Base load plant

1442. Power factor of a synchronous motor is unity when_____________?
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A. the armature current is minimum

B. the armature current is maximum

C. the armature current is zero

D. none of the above

1443. Inductance of a coil Varies__________?
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A. directly as the cross-sectional area of magnetic core

B. directly as square of number of turns

C. inversely as the length of the iron path

D. directly as the permeability of the core

E. as A. to (d)
1444. Underground cables are laid at sufficient depth___________?
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A. for all of the above reasons

B. to minimize the effect of shocks and vibrations due to gassing vehicles, etc

C. to avoid being unearthed easily due to removal of soil

D. to minimise temperature stresses

1445. During the charging of a lead-acid cell__________?
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A. it gives out energy

B. its voltage increases

C. its cathode becomes dark chocolate brown in colour

D. specific gravity of H2SO4 decreases

1446. A certain cable has an insulation of relative permittivity 4. If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become_____________?
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A. one half

B. double

C. four times

D. none of the above

1447. In a cable immediately above metallic sheath ______ is provided
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A. earthing connection

B. none of the above

C. armouring

D. bedding
1448. In constant-current charging method, the supply voltage from discharged to fully charged condition____________?
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A. increases

B. remains constant

C. decreases

D. none of the above

1449. All definitions of power factor of a series R-L-C circuit are correct except__________?
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A. ratio of W and VA

B. ratio of kW and kVA

C. ratio of J and Z

D. ratio of net reactance and impedance
1450. The r.m.s. value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time produces__________?
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A. none of the above

B. the less heat than produced by A.C. flowing through the same circuit

C. the same heat as produced by A.C. when flowing through the same circuit

D. the more heat than produced by A.C. when flowing through the same circuit

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