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
1851. The ignited or auxiliary anode in mercury arc rectifier is made of____________?
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A. aluminium

B. boron carbide

C. graphite

D. copper

1852. Which of the following capacitors preferred for high frequency circuits ?
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A. none of the above

B. Air capacitor

C. Electrolytic capacitor

D. Mica capacitor
1853. Air-core coils are practically free from______________?
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A. hysteresis losses

B. eddy current losses

C. both (A) and (B)

D. none of the above

1854. The relative permittivity has the following units__________?
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A. no units

B. m/F

C. Wb/m

D. F/m

1855. The capacitance of a capacitor is not affected by____________?
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A. area of plates

B. thickness of plates

C. distance between plates

D. all of the above

1856. The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is__________Vs
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A. 500

B. 20

C. 0.05

D. 50

1857. Which capacitor will be physically smaller for the same ratings ___________?
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A. Ceramic capacitor

B. Paper capacitor

C. Both will be of equal size

D. None of the above

1858. Which of the following capacitors can be used for temperature compensation ?
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A. None of the above

B. Ceramic capacitor

C. Air capacitor

D. Paper capacitor

1859. The ohmmeter reading for a short circuited capacitor is____________?
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A. few megohms

B. zero

C. infinity

D. few kilo ohms

1860. Conductance is analogous to_____________?
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A. inductance

B. reluctance

C. flux

D. permeance
1861. Laminated cores, in electrical machines, are used to reduce____________?
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A. hysteresis loss

B. eddy current loss

C. all of the above

D. copper loss

1862. A conductor 2 meters long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be____________?
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A. 50V

B. 25V

C. 15 V

D. 10 V

1863. A ferrite core has less eddy current loss than an iron core because_______________?
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A. ferrites have low permeability

B. ferrites are magnetic

C. ferrites have high hysteresis

D. ferrites have high resistance
1864. Which of the following is incorrect ?
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A. A storage cell has a reversible chemical reaction

B. A primary cell has an irreversible chemical reaction

C. A carbon-zinc cell has unlimited shelf life

D. A lead-acid cell can be recharged

1865. Which circuit element(s) will oppose the change in circuit current ?
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A. Resistance only

B. Inductance and capacitance

C. Capacitance only

D. Inductance only
1866. The electric field intensity at a point situated 4 meters from a point charge is 200 N/C. If the distance is reduced to 2 meters, the field intensity will be______________?
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A. 1200 N/C

B. 400 N/C

C. 800 N/C

D. 600 N/C

1867. One volt is the same as___________?
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A. one joule/coulomb

B. one coulomb

C. one joule

D. one coulomb/joule

1868. An open coil has_____________?
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A. infinite resistance and zero inductance

B. infinite resistance and normal inductance

C. zero resistance and inductance

D. zero resistance and high inductance

1869. An e.m.f. of 16 volts is induced in a coil of inductance 4H. The rate of change of current must be______________?
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A. 16 A/s

B. 4 A/s

C. 64 A/s

D. 32 A/s

1870. capacitors are mainly used for radio frequency tuning?
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A. Mica

B. Air

C. Electrolytic

D. Paper

1871. An electrolytic capacitor can be used for_____________?
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A. D.C. only

B. AC. only

C. both D.C. as well as A.C.

1872. The unit of retentivity is____________?
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A. ampere turn/meter

B. ampere turn

C. weber/sq. m

D. weber

1873. Two 300 uH coils in series without mutual coupling have a total inductance of___________?
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A. 300 uH

B. 75 uH

C. 150 uH

D. 600 uH

1874. An air gap is usually inserted in magnetic circuits to____________?
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A. prevent saturation

B. increase m.m.f.

C. increase the flux

D. none of the above

1875. The lines of force due to charged particles are_________?
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A. none of the above

B. sometimes curved

C. always straight

D. always curved
1876. Dielectric strength of medium____________?
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A. is same for all insulating materials

B. increases with moisture content

C. none of the above

D. increases with rise in temperature

1877. Which of the following expression is correct for electric field strength___________?
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A. E= nD2

B. E = D2/t

C. E = D/E

D. E = jtD

1878. Two infinite parallel plates 10 mm apart have maintained between them a potential difference of 100 V. The acceleration of an electron placed between them is______________?
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A. 1.5 x 1015 m/s2

B. 1.6 x 1015 m/s2

C. 1.76 x 1015 m/s2

D. 0.56 x 1015 m/s2

1879. If three 10 uF capacitors are connected in parallel, the net cararitance is___________?
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A. 20 uF

B. 50 uF

C. 30 uE

D. 40 uF

1880. The unit of capacitance is__________?
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A. farad/m

B. ohm

C. farad

D. henry

1881. Conductivity is analogous to____________?
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A. inductance

B. retentivity

C. permeability

D. resistivity

1882. ____________field is associated with the capacitor?
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A. Electric

B. Magnetic

C. Both (A) and (B)

D. None of the above

1883. Two coils have inductances of 8 mH and 18 mH and a co-efficient of coupling of 0.5. If the two coils are connected in series aiding, the total inductance will be______________?
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A. 38 mH

B. 48 mH

C. 32 mH

D. 40 mH

1884. Mutually inductance between two magnetically-coupled coils depends on____________?
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A. the number of their turns

B. permeability of the core

C. all of the above

D. cross-sectional area of their common core

1885. When a dielectric slab is introduced in a parallel plate capacitor, the potential difference between plates will______________?
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A. increase

B. become zero

C. remain uncharged

D. decrease
1886. For which of the following parameter variation, the capacitance of the capacitor remains unaffected ____________?
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A. Area of the plates

B. Nature of dielectric

C. Thickness of the plates

D. Distance between plates

1887. Lenzs law is a consequence of the law of conservation of__________?
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A. charge

B. energy

C. induced e.m.f.

D. induced current

1888. The dielectric constant (relative permittivity) of glass is given by___________?
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A. 5 to 100

B. 2.0 to 4.0

C. 0.1 to 0.4

D. 0.5 to 1.0

1889. Which of the following cell has a. reversible chemical reaction ___________?
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A. Silver-oxide

B. Lead-acid

C. Carbon-zinc

D. Mercury oxide

1890. The electrostatic force between two charges of one coulomb each and placed at a distance of 0.5 m will be____________?
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A. 36 x 108 N

B. 36 x 10fa

C. 36 x 109 N

D. 36 x 107 N

1891. For making a capacitor, it is better to select a dielectric having___________?
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A. permittivity slightly more than that of air

B. low permittivity

C. high permittivity

D. permittivity same as that of air

1892. Those magnetic materials are best suited for making armature and transformer cores which have ________ permeability and ________ hystersis loss
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A. low, high

B. high, high

C. low, low

D. high, low
1893. A region around a stationary electric charge has__________?
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A. an electric field

B. a magnetic field

C. both A. and (6)

D. none of the above

1894. In alkaline cell the electrolyte is_____________?
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A. dilute sulphuric acid

B. KOH

C. NaOH

D. concentrated sulphuric acid

1895. Which of the following capacitors will have the least value of breakdown voltage________ ?
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A. Electrolytic

B. Paper

C. Ceramic

D. Mica

1896. The direction of induced e.m.f. can be found by_____________?
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A. Kirchhoff s voltage law

B. Flemings right hand rule

C. Lenzs law

D. Laplaces law

1897. For a good 0.05 uF capacitor ohmmeter reading should___________?
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A. go quickly to 50 ohm approximately and remain there

B. show low resistance momentarily and back off to a very high resistance

C. show high resistance momentarily and then a very low resistance

D. not move at all

1898. The absolute permittivity of free space is given by_____________?
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A. 8.854 x 10?12 F/m

B. 8.854 x KT11 F/m

C. 8.854 x 1(T9 F/m)

D. 8.854 x 1(T10 F/m)
1899. Which among the following constitutes the major load for an automobile battery _________?
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A. Spark plugs

B. Self starter

C. Parking lights

D. Brake light

1900. For closer tolerances which of the following capacitors is usually preferred ?
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A. Mica capacitor

B. Paper capacitor

C. Ceramic disc capacitor

D. None of the above