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
1801. capacitors can be used only for D.C ?
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A. Mica

B. Air

C. Electrolytic

D. Paper

1802. When two batteries are connected in parallel, it should be ensured that___________?
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A. they have same ampere-hour capacity

B. they have same e.m.f.

C. they have identical internal resistance

D. they have same make

1803. The common impurity in the electrolyte of lead-acid battery is_____________?
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A. lead crystals

B. dust particles

C. iron

D. chlorine

1804. A condenser suitable for D.C. only is________?
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A. poled aluminium electrolytic condenser

B. metallic plate variable gang condenser

C. oil impregrated paper condenser

D. metallic paper capacitor

1805. In a mercury arc rectifier, the anode is usually made of_____________?
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A. graphite

B. tungsten

C. aluminium

D. silver

E. copper

1806. Energy stored in the electric field of a capacitor C when charged from a D.C source of voltage V is equal to joules_______________?
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A. CV

B. C2V

C. CV2

D. CV2
1807. Which of the following rectifiers are primarily used for charging of low voltage batteries from AC supply ?
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A. Mercury arc rectifiers

B. Electrolytic rectifiers

C. Selenium rectifiers

D. Mechanical rectifiers

E. Copper oxide rectifiers

1808. Selenium rectifier can be operated at temperatures as high as____________?
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A. 60C

B. 75C

C. 40C

D. 25C

1809. To prevent the generation of static charges on rubber or flat leather__________?
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A. conductive dressing is done

B. oil compound dressing is done

C. talcum powder is sprayed on the surface

D. surface is moistened

1810. The property of a capacitor to store electricity is called its____________?
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A. none of the above

B. capacitance

C. energy

D. charge

1811. The phenomenon of an uncharged body getting charged merely by the nearness of a charged body is known as____________?
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A. magnetic effect

B. chemical effect

C. induction

D. pholoelectric effect

1812. A gang condenser is a____________?
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A. polarised capacitor

B. variable capacitor

C. none of the above

D. ceramic capacitor

1813. The inverse of capacitance is called_______________?
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A. elastance

B. reluctance

C. conductance

D. susceptance

1814. A positive and a negative charge are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be________________?
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A. 10 times greater than before

B. 25 times larger than before

C. 5 times smaller than before

D. 5 times greater than before

1815. The direction of electric field due +0 positive charge is ___________?
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A. away from the charge

B. towards the charge

C. both A. and (6)

D. none of the above

1816. The presence of an uncharged conductor near a charged one increases the__________?
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A. potential of the charged conductor

B. all of the above

C. capacity of the charged conductor

D. charge of the charged conductor

1817. The unit of reluctance is_____________?
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A. 1/henry

B. metre/henry

C. henry/metre

D. henry

1818. When a dielectric is placed in an electric field the field strength____________?
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A. increases

B. remain unchanged

C. reduces to zero

D. decreases
1819. The sparking between two electrical contacts can be reduced by inserting a___________?
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A. none of the above

B. capacitor in parallel with contacts

C. capacitor in series with each contact

D. resistance in line

1820. A commutating rectifier consists of commutator driven by___________?
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A. a D.C. shunt motor

B. an induction motor

C. a synchronous motor

D. a D.C. series motor

1821. In phase-shift control method the control is carried out by varying the of grid voltage
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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__________?
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A. 40% of capacity

B. 10% of capacity

C. 20% of capacity

D. 30% of capacity

1823. Which medium has the least dielectric strength ____________?
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A. Quartz

B. Glass

C. Air

D. Paraffin wax

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

B. unchanged inductance

C. increased inductance

D. zero inductance

1825. The unit of dielectric strength is given by___________?
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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________________?
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A. 60 N

B. 15 N

C. 30 N

D. 40 N

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

B. Michale

C. Faraday

D. None of the above

1828. A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is_____________?
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A. 0.12 F

B. 0.6 F

C. 0.024 F

D. 0.8 F

1829. Which of the following statements is correct ?
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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 __________?
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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____________?
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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_____________?
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A. 48mH

B. 3 mH

C. 24mH

D. 12 mH

1833. Satellite power requirement is provided through________?
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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______________?
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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
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A. Yes

B. No

1836. The magnitude of the induced e.m.f. in a conductor depends on the______________?
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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____________?
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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____________?
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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_____________?
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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__________?
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A. self-inductance

B. series aiding inductance

C. capacitance

D. mutual inductance

1841. Reciprocal of reluctance is_______________?
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A. susceptibility

B. reluctivity

C. permeance

D. permeability

1842. What will happen to an insulating medium if voltage more than the breakdown voltage is applied on it__________ ?
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A. Its molecular structure will get changed

B. It will get punctured or cracked

C. It will melt

D. It will become magnetic

1843. Relative permeability of vacuum is__________?
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A. 1 H/m

B. 1/4JI

C. 4n x 10- H/m

D. 1
1844. The power dissipated in a pure capacitor is______________?
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A. zero

B. proportional to applied voltage

C. proportional to value of capacitance

D. both (B) and (C) above

1845. Three capacitors each of the capacity C are given. The resultant capacity 2/3 C can be obtained by using them_____________?
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A. all in series

B. two in parallel and third in series with this combination

C. all in parallel

D. two in series and third in parallel across this combination

1846. If the sheet of a bakelite is inserted between the plates of an air capacitor, the capacitance will__________?
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A. remains unchanged

B. decrease

C. become zero

D. increase
1847. Which of the following statement is true __________?
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A. The current in the discharging capacitor decreases constantly

B. The current in the discharging capacitor grows linearly

C. The current in the discharging capacitor decays exponentially

D. The current in the dicharging capacitor grows exponentially
1848. Which of the following materials has the highest value of dielectric constant___________?
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A. Glass

B. Oil

C. Ceramics

D. Vacuum

1849. A capacitor consists of_____________?
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A. two insulators only

B. two conductors separated by an insulator

C. two insulators separated by a conductor

D. two conductors only

1850. A capacitance is a circuit component that opposes the change in circuit__________?
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A. Voltage

B. None of the above

C. Current

D. impedance