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
4151. Electric displacement is a__________quantity
comments icon0

A. scalar

B. vector

C. both of the above

D. none of the above

4152. The sparking between two electrical contacts can be reduced by inserting a___________?
comments icon0

A. none of the above

B. resistance in line

C. capacitor in series with each contact

D. capacitor in parallel with contacts
4153. The capacitance of a capacitor is not affected by____________?
comments icon0
A. thickness of plates

B. all of the above

C. distance between plates

D. area of plates

4154. The time constant and R-C circuit may also be defined as the time during which the charging current falls to ________ percent of its initial maximum value
comments icon0

A. 73

B. 37

C. 42

D. 63

4155. If A.C. voltage is applied to capacitive circuit, the alternating current can flow in the circuit because__________________?
comments icon0
A. varying voltage produces the charging and dicharging currents

B. of high peak value

C. charging current can flow

D. discharge current can flow

4156. The dissipation factor of a good dielectric is of the order of____________?
comments icon0

A. 0.2

B. 0.0002

C. 0.002

D. 0.02

4157. A single core cable used on 33000 V has conductor diameter 10 mm and the internal diameter of sheath 25 mm. The maximum electrostatic stress in the cable is____________?
comments icon0

A. 92 x 105 V/m

B. 82 x 105 V/m

C. 72 x 105 V/m

D. 62 x 105 V/m

4158. A region around a stationary electric charge has__________?
comments icon0
A. an electric field

B. a magnetic field

C. both A. and (6)

D. none of the above

4159. The dielectric constant (relative permittivity) of glass is given by___________?
comments icon0
A. 5 to 100

B. 0.1 to 0.4

C. 2.0 to 4.0

D. 0.5 to 1.0

4160. A closed surface contains two equal and opposite charges. The net electric flux from the surface will be________________?
comments icon0

A. positive

B. zero

C. negative

D. data is insufficient

4161. An uncharged conductor is placed near a charged conductor, then_____________?
comments icon0

A. the uncharged conductor is attracted first and then charged by induction

B. it remains as such

C. the uncharged conductor gets charged by induction and then attracted towards the charging body

D. the uncharged conductor gets charged by conduction

4162. Air capacitors are generally available in the range_________?
comments icon0

A. 100 to 900 pF

B. 20 to 100 pF

C. 1 to 20 pF

D. 10 to 400 pF
4163. The inverse of capacitance is called_______________?
comments icon0

A. conductance

B. reluctance

C. elastance

D. susceptance

4164. The ohmmeter reading for a short circuited capacitor is____________?
comments icon0

A. few megohms

B. zero

C. infinity

D. few kilo ohms

4165. An electrolytic capacitor is generally made to provide__________?
comments icon0

A. variable capacitance

B. low capacitance

C. fixed capacitance

D. large value of capacitance
4166. capacitors can be used only for D.C ?
comments icon0
A. Electrolytic

B. Paper

C. Mica

D. Air

4167. Electric field intensity is a quantity_____________?
comments icon0

A. scalar

B. vector

C. both A. and (6)

D. none of the above

4168. Which of the following capacitors has relatively shorter shelf life____________?
comments icon0

A. Ceramic capacitor

B. Electrolytic capacitor

C. Paper capacitor

D. Mica capacitor

4169. at a point may be defined as equal to the lines of force passing normally through a unit cross section at that point ?
comments icon0

A. None of the above

B. Magnetic flux density

C. Electric intensity

D. Electric flux

4170. In order to remove static electricity from machinery___________?
comments icon0
A. ground the framework

B. construct insulated cabins

C. insulate the machinery

D. humidify the surroundings

4171. When a dielectric is placed in an electric field the field strength____________?
comments icon0

A. reduces to zero

B. increases

C. decreases

D. remain unchanged

4172. Two similar charges each of one coulomb placed in air one meter apart repel each other with a force______________?
comments icon0

A. 9.2 x 104N

B. 9 x 107N

C. 9 x 109N

D. 9 x 109N
4173. The number of Faraday tubes of flux passing through a surface in an electric field is called____________?
comments icon0

A. electric charge density

B. electric flux density

C. electric flux

D. magnetic flux density

4174. In a capacitor the electric charge is stored in____________?
comments icon0

A. metal plates

B. dielectric

C. both (A) and (B)

D. none of the above

4175. The direction of electric field due +0 positive charge is ___________?
comments icon0
A. away from the charge

B. towards the charge

C. both A. and (6)

D. none of the above

4176. A capacitor consists of_____________?
comments icon0

A. two conductors only

B. two conductors separated by an insulator

C. two insulators only

D. two insulators separated by a conductor

4177. Which is the most superior dielectric out of the following ?
comments icon0

A. Glass

B. Bakelite

C. Paper

D. Air

4178. Potential difference is the work done in moving unit positive charge form one point to another________________?
comments icon0

A. in the direction of electric intensity

B. against electric intensity

C. in the direction of electric flux

D. in any direction

4179. Voltage applied across a ceramic dielectric produces an electrolytic field 100 times greater than air. What will be the value of dielectric constant ________?
comments icon0

A. 50

B. 200

C. 100

D. 150

4180. Capacitance increases with_____________?
comments icon0
A. increase in plate area and decrease in distance between the plates

B. decrease in plate area and value of applied voltage

C. reduction in plate area and distance between the plates

D. increase in plate area and distance between the plates

4181. Electric flux linked with a surface will be maximum when____________?
comments icon0

A. The surface is held parallel to the electric field

B. The surface is held perpendicular to the electric field

C. The surface makes an angle of 45with the field

D. All of the above

4182. at a point is equal to the negative potential gradient at that point?
comments icon0

A. Electric flux

B. Magnetic flux density

C. Magnetic flux

D. Electric intensity
4183. Two oppositely charged balls A and B attract third conducting ball C when placed near them turn by turn. Then ball C must be______________?
comments icon0

A. positively and negatively charged

B. negatively charged

C. electrically neutral

D. positively charged

4184. The potential gradient across the material of low permittivity is than across the material of high permittivity?
comments icon0

A. smaller

B. greater

C. both (A) and (B)

D. none of the above

4185. If two charges are increased by two times then force_____________?
comments icon0
A. Increases 4 times

B. Increases 9 times

C. Decreases 9 times

D. Decreases 4 times

4186. Which of the following material has least value of dielectric constant ?
comments icon0

A. Ceramics

B. Glass

C. Oil

D. Paper

4187. Which of the following statement is true __________?
comments icon0
A. The current in the dicharging capacitor grows exponentially

B. The current in the discharging capacitor grows linearly

C. The current in the discharging capacitor decays exponentially

D. The current in the discharging capacitor decreases constantly

4188. Which of the following capacitors will have the least value of breakdown voltage________ ?
comments icon0

A. Ceramic

B. Electrolytic

C. Paper

D. Mica

4189. A unit tube of flux is known as tube___________?
comments icon0

A. Newton

B. Faraday

C. Michale

D. None of the above

4190. SI unit of the permittivity of free space is________________?
comments icon0

A. N-1mC-2

B. Nm2C2

C. NmC-1

D. N-1m-2C2
4191. 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. 30 N

C. 15 N

D. 40 N

4192. An electric charge at rest produces_______________?
comments icon0

A. only a magnetic field

B. only an electric field

C. neither electric field nor magnetic field

D. both electric and magnetic fields

4193. A potential of 400 V is applied to a capacitor, the plates of which are 4 mm apart. The strength of electric field is___________?
comments icon0
A. 100 kV/m

B. 10 kV/m

C. 2 kV/m

D. 5 kV/m

4194. If an electrons is allowed to move along the field in a non uniform electric field then it will follow__________________?
comments icon0
A. Straight line

B. Curved path

C. Circular path

D. Spiral path

4195. Three capacitors each of the capacity C are given. The resultant capacity 2/3 C can be obtained by using them_____________?
comments icon0

A. all in series

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

C. all in parallel

D. two in parallel and third in series with this combination
4196. The force per unit charge is know as__________________?
comments icon0
A. electric intensity

B. electric flux

C. electric potential

D. all of above are same

4197. Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become_____________?
comments icon0

A. 1/4th of its original value

B. 4 times of its original value

C. 1/8th of its original value

D. 8 times of its original value

4198. Which medium has the least dielectric strength ____________?
comments icon0
A. Air

B. Quartz

C. Paraffin wax

D. Glass

4199. The total electric flux through any closed surface surrounding charges is equal to the amount oflcharge enclosed. The above statement is associated with____________?
comments icon0

A. Coulombs square law

B. Gausss law

C. Maxwells first law

D. Maxwells second law

4200. Electric force between two point charges in air or vacuum is F. If we replace air or vacuum by an insulator (dielectric) of relative permitivity Cr the force between the charges will_______________?
comments icon0
A. decrease

B. increase

C. remain constant

D. depends upon composition of dielectric