electrical engineering MCQs – Page 208

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 Review each marked answer and report any item that may be outdated or unclear.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 generation 2. analog electronics 3. solid state switching circuits 4. parallel circuits 5. switchgear and protection 6. op amp circuits 7. transistor audio power amplifiers 8. electrostatics 9. heating and welding 10. multi stage transistor amplifiers 11. passive filters 12. network theorems 13. regulated d c power supply 14. a c fundamentals circuits and circuit theory 15. electromagnetic induction 16. power electronics 17. magnetism and electromagnetism 18. transformers 19. modulation and demodulation 20. d c generators 21. semiconductor theory 22. single phase induction motors 23. semiconductor diode 24. hybrid parameters 25. digital electronics 26. oscillators 27. earthing or grounding 28. single stage transistor amplifiers 29. d c motors 30. transistor biasing 31. amplifiers with negative feedback 32. basic electrical 33. electronic instruments 34. synchronous motors 35. field effect transistors fet 36. magnetic circuit 37. control systems 38. industrial drives 39. power generation 40. series parallel circuits 41. transistor tuned amplifiers 42. electrical engineering materials 43. rectifiers and converters 44. integrated circuits 45. scr silicon controlled rectifiers 46. cables 47. polyphase induction motors 48. measurement and instrumentation 49. transistors 50. electrical machine design 51. electrolysis and storage of batteries 52. electric traction 53. transmission and distribution

4141. Which of the following capacitors preferred for high frequency circuits ?
0

A. Mica capacitor

B. Air capacitor

C. none of the above

D. Electrolytic capacitor

4142. N/C =_____________?
0

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______________?
0

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___________?
0

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______________?
0

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_____________?
0

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

4151. Electric displacement is a__________quantity
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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___________?
0

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____________?
0

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
0

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__________________?
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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____________?
0

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____________?
0

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__________?
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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___________?
0

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________________?
0

A. positive

B. zero

C. negative

D. data is insufficient

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