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
4101. Permittivity is expressed in_____________?
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A. Weber/meter

B. Farad/sq-m

C. Farad/meter

D. Weber/sq-m

4102. If a charged rod is brought closer to a gas filled balloon then______________?
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A. Balloon bursts

B. Balloon squeezes

C. Radius decreases

D. Radius increase
4103. Equivalent capacitance is greater than individual capacitances in_____________?
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A. series combination

B. parallel combination

C. both series and parallel combinations

D. none of above

4104. The bridge used for the measurement of the value of the capacitance is____________?
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A. Wiens bridge

B. Hays bridge

C. Schering bridge

D. Wheatstone bridge

4105. The presence of an uncharged conductor near a charged one increases the__________?
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A. all of the above

B. charge of the charged conductor

C. potential of the charged conductor

D. capacity of the charged conductor
4106. capacitors are used for audio frequency and radio frequency coupling and tuning ?
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A. Air

B. Plastic film

C. Ceramic

D. Mica
4107. Which of the following capacitor is preferred in case of single phase motor ?
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A. Mica capacitor

B. Ceramic capacitor

C. Electrolytic capacitor

D. Paper capacitor

4108. Mica capacitors are characterized by all of the following except___________?
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A. accurate value

B. stable operation

C. low losses

D. low leakage reactance
4109. 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. permittivity same as that of air

D. high permittivity
4110. In a charged capacitor the energy resides in________________?
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A. magnetic hield

B. nuclear field

C. gravitational field

D. electric field
4111. 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

4112. A capacitor consists of two____________?
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A. conductors separated by an insulator

B. silver-coated insulators

C. insulators separated by a dielectric

D. ceramic plates and one mica disc

4113. Dielectric strength of a material depends on_____________?
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A. thickness

B. temperature

C. moisture content

D. all of the above

E. none of the above

4114. In the case of a lossy capacitor, its series equivalent resistance value will be_______________?
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A. very small

B. small

C. large

D. zero

4115. While testing a capacitor with ohm meter, if the capacitor shows charging, but the final resistance reading is appreciably less than normal, it can be concluded that the capacitor is____________?
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A. open circuited

B. leaky

C. short-circuited

D. alright

4116. Out of the following capacitors of identical rating which one will have the smallest dimensions ___________ ?
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A. Ceramic capacitor

B. Mica capacitor

C. Paper capacitor

D. Aluminium foil capacitor

4117. Two plates of a parallel plate capacitor after being charged from a constant voltage source are separated apart by means of insulated handles, then the____________?
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A. charge on the capacitor decreases

B. charge on the capacitor increases

C. voltage across the plates decreases

D. Voltage across the plates increases

4118. What will happen to an insulating medium if voltage more than the breakdown voltage is applied on it__________ ?
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A. It will get punctured or cracked

B. It will melt

C. It will become magnetic

D. Its molecular structure will get changed

4119. The phenomenon of an uncharged body getting charged merely by the nearness of a charged body is known as____________?
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A. chemical effect

B. magnetic effect

C. pholoelectric effect

D. induction
4120. The absolute permittivity of free space is given by_____________?
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A. 8.854 x KT11 F/m

B. 8.854 x 1(T9 F/m)

C. 8.854 x 10?12 F/m

D. 8.854 x 1(T10 F/m)
4121. A dielectric material must be____________?
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A. good conductor

B. semi conductor

C. resistor

D. insulator
4122. 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

4123. Photocopier and inject printer are dealt in________________?
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A. Electrostatics

B. Capacitors

C. Charges in motion

D. Electric fields

4124. Electric intensity at any point in an electric field is equal to the at that point?
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A. electric flux

B. potential gradient

C. none of the above

D. magnetic flux density

4125. A capacitor in a circuit became hot and ultimately exploded due to wrong connections, which type of capacitor it could be ?
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A. Paper capacitor

B. Electrolytic capacitor

C. Any-of the above

D. Ceramic capacitor

4126. capacitors are mainly used for radio frequency tuning?
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A. Electrolytic

B. Paper

C. Air

D. Mica

4127. select the only wrong statement?
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A. similar charges repel each other

B. dissimilar charges attract each other

C. repulsion is the sure test of electrification

D. an electrically neutral body is repelled both positively and negatively charged bodies
4128. What is the value of capacitance that must be connected in parallel with 50 pF condenser to make an equivalent capacitance of 150 pF ?
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A. 50 pF

B. 150 pF

C. 200 pF

D. 100 pF
4129. When the dielectric is homogeneous,the potential gradient is_____________?
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A. uniform

B. zero

C. any of the above

D. non-uniform

4130. The units of volume charge density are___________?
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A. Coulomb/meter

B. Coulomb/meter

C. Coulomb/meter

D. Coulomb/meter
4131. When we rub a glass rod with a silk cloth then________________?
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A. glass rod acquires negative charge while silk acquires positive charge

B. glass rod acquires positive charge while silk acquires negative charges

C. both glass rod and silk acquire negative charge

D. both glass rod and silk acquire positive charge

4132. Equipotential planes are_______________?
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A. parallel to one another

B. intersecting

C. circular

D. non parallel to one another

4133. 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. become zero

C. increase

D. decrease

4134. Value of ?r for various dielectrics is always________________?
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A. Less than unity

B. Larger than unit

C. Equal to the unit

D. No hard and fast rule

4135. Which of the following statements is correct ___________?
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A. Mica capacitors are available in capacitance value of 1 to 10 pF

B. Ceramic capacitors must be connected in the correct polarity

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

D. Electrolytic capacitor must be connected in the correct polarity
4136. A hollow metallic sphere of 8cm diameter is charged with 4 x 10 8C. The potential on its surface will be_________________?
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A. zero

B. 9000 volts

C. 90 volts

D. 900 volts

4137. Electric flux due to a point charge +q is______________?
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A. 1/4II?0. q/r2

B. 1/4II? q/r

C. 4II?0

D. q/?0
4138. When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of_____________?
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A. 2 joules

B. 8 joules

C. 4 joules

D. 6 joules

4139. To prevent the generation of static charges on rubber or flat leather__________?
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A. oil compound dressing is done

B. conductive dressing is done

C. surface is moistened

D. talcum powder is sprayed on the surface

4140. Which of the following materials has the highest value of dielectric constant___________?
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A. Vacuum

B. Oil

C. Glass

D. Ceramics

4141. Which of the following capacitors preferred for high frequency circuits ?
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A. Mica capacitor

B. Air capacitor

C. none of the above

D. Electrolytic capacitor

4142. N/C =_____________?
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A. V/A

B. J/V

C. V/m

D. A/m

4143. 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. 0.56 x 1015 m/s2

B. 1.6 x 1015 m/s2

C. 1.76 x 1015 m/s2

D. 1.5 x 1015 m/s2

4144. The units of capacitance are____________?
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A. henry/Wb

B. volts/coulomb

C. coulombs/volt

D. ohms

4145. A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is___________?
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A. 0.6 F

B. 0.12 F

C. 0.8 F

D. 0.024 F
4146. When a dielectric slab is introduced in a parallel plate capacitor, the potential difference between plates will______________?
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A. become zero

B. decrease

C. increase

D. remain uncharged

4147. If free space between the plates of a capacitor is replaced by a dielectric_____________?
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A. The potential difference remains constant capacittance and energy stored increases

B. The potential difference remains constant capacittance decreases and energy increases

C. The potential difference decreases but both capacitance and energy increase

D. both potential difference and capacitance decrease but energy increases

4148. The property of a capacitor to store electricity is called its____________?
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A. none of the above

B. energy

C. charge

D. capacitance
4149. For which of the following parameter variation, the capacitance of the capacitor remains unaffected ____________?
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A. Thickness of the plates

B. Nature of dielectric

C. Area of the plates

D. Distance between plates

4150. Which of the following is not a vector ___________?
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A. Electric potential

B. Linear momentum

C. Electric field

D. Angular momentum