electrical engineering MCQs – Page 207

Practise multiple-choice questions from electrical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

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
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