electrical engineering MCQs – Page 92

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 Review each marked answer and report any item that may be outdated or unclear.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
1821. In phase-shift control method the control is carried out by varying the of grid voltage
comments icon0

A. none of the above

B. magnitude

C. polarity

D. phase

E. any of the above

1822. Under normal charging rate, the charging current should be__________?
comments icon0

A. 40% of capacity

B. 10% of capacity

C. 20% of capacity

D. 30% of capacity

1823. Which medium has the least dielectric strength ____________?
comments icon0

A. Quartz

B. Glass

C. Air

D. Paraffin wax

1824. A crack in the magnetic path of an inductor will result in________________?
comments icon0
A. reduced inductance

B. unchanged inductance

C. increased inductance

D. zero inductance

1825. The unit of dielectric strength is given by___________?
comments icon0
A. V/m

B. m/V

C. V2/m

D. m/V2

1826. The force between two charges is 120 N. If the distance between the charges is doubled, the force will be________________?
comments icon0

A. 60 N

B. 15 N

C. 30 N

D. 40 N

1827. A unit tube of flux is known as tube___________?
comments icon0

A. Newton

B. Michale

C. Faraday

D. None of the above

1828. A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is_____________?
comments icon0

A. 0.12 F

B. 0.6 F

C. 0.024 F

D. 0.8 F

1829. Which of the following statements is correct ?
comments icon0
A. Electrolytic capacitors must be connected in correct polarity

B. Air capapitors have a black band to indicate the outside foil

C. Ceramic capacitors must be connected in correct polarity

D. Mica capacitors are available in capacitance values of 5 to 20 uF

1830. When the load resistance equals the generator resistance which of the following will be maximum __________?
comments icon0
A. Power in the load resistance

B. Efficiency of the circuit

C. Voltage across the load resistance

D. Current

1831. If current in a conductor increases then according to Lenzs law self-induced voltage will____________?
comments icon0

A. aid the applied voltage

B. aid the increasing current

C. tend to decrease the amount of cur-rent

D. produce current opposite to the in-creasing current
1832. The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the inductance will be_____________?
comments icon0

A. 48mH

B. 3 mH

C. 24mH

D. 12 mH

1833. Satellite power requirement is provided through________?
comments icon0

A. nickel-cadmium cells

B. dry cells

C. lead-acid batteries

D. solar cells
1834. The inductance of a coil will increase under all the following conditions except______________?
comments icon0

A. when the number of turns of the coil increase

B. when more area for each turn is provided

C. when more length for the same number of turns is provided

D. when permeability of the core increases

1835. The polarity of the induced voltage can be determined by using the left-hand generator rule
comments icon0
A. Yes

B. No

1836. The magnitude of the induced e.m.f. in a conductor depends on the______________?
comments icon0
A. rate of change of flux-linkages

B. flux density of the magnetic field

C. amount of flux linkages

D. amount of flux cut

1837. The dissipation factor of a good dielectric is of the order of____________?
comments icon0

A. 0.02

B. 0.2

C. 0.0002

D. 0.002

1838. The ability of charged bodies to exert force on 6ne another is attributed to the existence of____________?
comments icon0

A. protons

B. neutrons

C. electric field

D. electrons

1839. A coil with negligible resistance has 50V across it with 10 mA. The inductive reactance is_____________?
comments icon0

A. 1000 ohms

B. 50 ohms

C. 500 ohms

D. 5000 ohms
1840. The property of coil by which a counter e.m.f. is induced in it when the current through the coil changes is known as__________?
comments icon0
A. self-inductance

B. series aiding inductance

C. capacitance

D. mutual inductance