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
4201. Which of the following statements is correct ?
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A. Ceramic capacitors must be connected in correct polarity

B. Electrolytic capacitors must be connected in correct polarity

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

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

4202. Dielectric strength _________ with increasing thickness
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A. none of the above

B. decreases

C. remains unaltered

D. increases

4203. A gang condenser is a____________?
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A. variable capacitor

B. polarised capacitor

C. none of the above

D. ceramic capacitor

4204. If a 6 uF capacitor is charged to 200 V, the charge in coulombs will be____________?
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A. 1600 uC

B. 1200 uC

C. 900 uC

D. 800 uC

4205. select the correct statement?
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A. the electric lines of force have no physical existence

B. all the above statements are true

C. they expand laterally and contract longitudinally

D. they do not cross each other and group together in dielectric

4206. capacitor is to have an energy content of 20J it must be placed across a potential difference of________________?
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A. 9 volts

B. 4 volts

C. 2 volts

D. 1 vol

4207. The capacitance C is charged through a resistance R. The time constant of the charging circuit is given by__________?
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A. CIR

B. RIC

C. RC

D. 1/RC

4208. The electric charge of 100 C is 13cm apart from another charge 16.9C electric force between them is_____________?
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A. 9x106N

B. 900N

C. 9x105N

D. 9x107N

4209. In a non-uniform electric field a polar molecule will experience____________?
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A. Net torque

B. Net force

C. both series and parallel combinations

D. zero

4210. A 25eV electron has a speed of______________?
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A. 4 x 106m/sec

B. 5 x 106m/sec

C. 3 x 106m/sec

D. 2 x 106m/sec

4211. The capacitor preferred for high frequency circuits is_____________?
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A. none of the above

B. mica capacitor

C. air capacitor

D. electrolytic capacitor

4212. Dielectric strength of a medium is usually expressed in____________?
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A. N/mm

B. C/m2

C. kV/mm

D. J/mm

4213. Which of the following statements is incorrect ?
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A. A capacitor can store charge because it has a dielectric between two conductors

B. Capacitors in series provide less capacitance but a higher voltage breakdown rating for the combination

C. A six dot mica capacitor colour coded white, green, black, red and yellow has the capacitance value of 500 pF

D. The thinner the dielectric, the more the capacitance and the lower the voltage breakdown rating for a capacitor .

4214. The ability of charged bodies to exert force on 6ne another is attributed to the existence of____________?
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A. electrons

B. neutrons

C. protons

D. electric field
4215. Electric intensity at infinite distance from the point charge is_____________?
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A. zero

B. positive

C. negative

D. infinite

4216. The number of electrons in one coulomb charge is equal to_______________?
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A. 1.6 x 10-27

B. 1.6 x 1019

C. 6.2 x 1018

D. 6.2 x 1021

4217. Paper condenser is___________?
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A. a variable condenser

B. always polarised

C. usually of fixed value

D. electrolytic condenser

4218. Dielectric strength of medium____________?
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A. increases with rise in temperature

B. increases with moisture content

C. is same for all insulating materials

D. none of the above
4219. is that property of a capacitor which delays any change of voltage across it ?
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A. None of the above

B. Capacitance

C. Inductance

D. Potential gradient

4220. The unit of capacitance is__________?
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A. farad

B. ohm

C. farad/m

D. henry

4221. A 5 ?F capacitor has a potential difference across its plates of 200 volts. The charge on the capacitor is____________?
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A. 4 x 103 C

B. 2.5 x 10-8 C

C. 10-5 C

D. 103 C

4222. Selenium becomes a conductor in light so it behaves like____________?
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A. Semiconductor

B. Photodiode

C. Light emitting diode

D. Capacitor

4223. One volt is the same as___________?
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A. one coulomb/joule

B. one joule/coulomb

C. one coulomb

D. one joule

4224. In a capacitive circuit___________?
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A. a steady value of applied voltage causes discharge

B. an increase in applied voltage makes a capacitor charge

C. decrease in applied voltage makes a capacitor charge

D. none of the above

4225. The unit of dielectric strength is given by___________?
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A. V/m

B. m/V2

C. V2/m

D. m/V

4226. A capacitance of 100 fiF is connected in series with a resistance of 8000 2. The time constant of the circuit is______________?
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A. 0.8 s

B. 0.2 s

C. 0.4 s

D. 0.6 s

4227. capacitors are used in transistor circuits?
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A. Ceramic

B. Air

C. Paper

D. Electrolytic

4228. A capacitor is a perfect insulator for______________?
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A. direct current

B. alternating current

C. both for the direct and alternating current

D. none of above

4229. 1 volt/meter is same as___________?
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A. 1 newton/meter

B. 1 meter/coulomb

C. 1 joule/coulomb

D. 1 newton meter

4230. A capacitance is a circuit component that opposes the change in circuit__________?
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A. Current

B. impedance

C. None of the above

D. Voltage
4231. Which of the following capacitors will have the least variation ____________?
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A. Silver plated mica capacitor

B. None of the above

C. Ceramic capacitor

D. Paper capacitor

4232. The time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to _________ percent of its value
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A. 37, initial

B. 62, initial

C. 37, final

D. 62, final
4233. A paper capacitor is usually available in the form of_____________?
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A. disc

B. meshed plates

C. tubes

D. rolled foil
4234. 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. CV2

C. C2V

D. CV2

4235. 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. 5 times greater than before

C. 5 times smaller than before

D. 25 times larger than before
4236. The capacity of capacitor bank used in power factor correction is expressed in terms of____________?
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A. volts

B. kVAR

C. kVA

D. kW

4237. 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. 600 N/C

D. 800 N/C
4238. 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.

4239. For a good 0.05 uF capacitor ohmmeter reading should___________?
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A. show high resistance momentarily and then a very low resistance

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

C. not move at all

D. go quickly to 50 ohm approximately and remain there

4240. If a third equal and similar charge is placed between two equal and similar charges, then this third charge will_____________?
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A. be in unstable equilibrium

B. move out of the field of influence of the two charges

C. remain in stable equilibrium

D. not be in equilibrium

4241. A field line and an equipotential surface are____________?
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A. always at 90

B. none of the above

C. always parallel

D. inclined at any angle 0

4242. If mica sheet is placed between the plates of a capacitor the capacity_______________?
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A. decreases then increases

B. decreases

C. increases

D. increases then decreases

4243. Which of the following capacitors is marked for polarity ?
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A. Mica

B. Air

C. Paper

D. Electrolytic
4244. An electric field can deflect_______________?
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A. Neutrons

B. X-rays

C. Both glass rod and silk acquire a negative charge

D. None
4245. If three 15 uF capacitors are connected in series, the net capacitance is
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A. 50 uF

B. 5 uF

C. 30 uF

D. 45 uF

4246. If the distance between the two point charges become half then force between them becomes______________?
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A. remains same

B. half

C. four times

D. double

4247. The value of dielectric constant for vacuum is taken as____________?
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A. 4

B. 1

C. zero

D. 10

4248. In a cable capacitor, voltage gradient is maximum at the surface of the______________?
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A. sheath

B. insulator

C. conduction

D. earth

4249. The capacitance between two plates increases with____________?
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A. shorter plate area and shorter distance between them

B. shorter plate area and higher applied voltage

C. larger plate area and shorter distance between plates

D. larger plate area, longer distance between plates and higher,applied voltage

4250. The surface integral of the normal component of the electric displacement D over any closed surface equals the charge enclosed by the surface. The above statement is associated with_______?
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A. Faradays law

B. Gausss law

C. Kirchhoff s law

D. Lenzs law