electrical engineering MCQs – Page 109

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 Review each marked answer and report any item that may be outdated or unclear.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

2161. The attraction capacity of electromagnet will increase if the_______________?
0

A. flux density decreases

B. flux density increases

C. core area increases

D. core length increases i

2162. What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m ?
0

A. 4 AT

B. 10 AT

C. 2 AT

D. 6 AT

2163. By which of the following methods major portion of the heat generated in a H.R.C. fuse is dissipated ?
0

A. Conduction

B. All of the above

C. Radiation

D. Convection

2164. The current zero interruption, in oil and air blast circuit breakers, is achieved by____________?
0

A. lengthening of the gap

B. cooling and blast effect

C. both (A) and (B)

D. deionizing the oil with forced air

E. none of the above

2165. The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to______________?
0

A. insulate the contacts from switch body

B. lubricate the contacts

C. none of the above

D. all of the above

E. extinguish the arc

2166. Two infinitely long parallel conductors in vacuum any separated 1 metre between centers >then a current of 1 ampere flows the. uk each conductor, produce on each other a force of_________________?
0

A. 2x 1(T7 N/m)

B. 2 x KT3 N/m

C. 2 x 10?5 N/m

D. 2 x 1(T2 N/m)

2167. The uniform magnetic field is______________?
0

A. none of the above

B. the field of a single conductor

C. the field of a set of parallel conductors

D. the field in which all lines of magnetic flux are parallel and equidistant

2168. With a motor converter it is possible to obtain D.C. voltage only upto__________?
0

A. 600800 V

B. 200-100 V

C. 17002000 V

D. 10001200 V

2169. The bar magnet has____________?
0

A. A. and B. both

B. monopole moment

C. none of the above

D. the dipole moment

2170. The direction of magnetic lines of force is________________?
0

A. from one end of the magnet to another

B. none of the above

C. from south pole to north pole

D. from north pole to south pole

2171. The main constituent of permalloy is_____________?
0

A. cobalt

B. nickel

C. chromium

D. tungsten

2172. In a three-phase mercury arc rectifiers each anode conducts for____________?
0

A. one-third of a cycle

B. two-third of a cycle

C. one-half a cycle

D. one-fourth of a cycle

2173. Which of the following statements is incorrect ?
0

A. Shunt reactors are used as compensation reactors

B. Lightning arrestors are used before the switchgear

C. The peak short current is (1.8 xV2) times the A.C. component

D. The MVA at fault is equal to base MVA divided by per unit equivalent fault reactance

2174. Relays can be designed to respond to changes in________________?
0

A. temperature

B. light intensity

C. voltage and current

D. resistance, reactance or impedance

E. all above

2175. In a glass bulb mercury arc rectifier the maximum current rating is restricted to___________?
0

A. 1000 A

B. 2000 A

C. 500 A

D. 1500 A

2176. A permanent magnet______________?
0

A. attracts some substances and repels others

B. attracts ferromagnetic substances and repels all others

C. attracts only ferromagnetic substances

D. attracts all paramagnetic substances and repels others

2177. Wave trap is used to trap waves of__________________?
0

A. higher frequencies entering generator or transformer units

B. either of the above

C. power frequencies

D. none of the above

2178. In a simple magnetic field the strength of magnet flux_______________?
0

A. first increases and then decreases till it becomes zero

B. is constant and has same value in energy part of the magnetic field

C. increases continuously from initial value to final value

D. decreases continuously from initial value to final value

2179. Fault diverters are basically____________?
0

A. fast switches

B. relays

C. fuses

D. circuit breakers

2180. In a mercury arc rectifier characteristic blue luminosity is due to_____________?
0

A. high temperature

B. electron streams

C. ionization

D. colour of mercury

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