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
2151. A _________ is used to measure the stator % winding temperature of the generator?
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A. pyrometer

B. resistance thermometer

C. thermometer

D. thermocouple

2152. In a rotary converter I2R losses as compared to a D.C. generator of the same size will be___________?
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A. three times

B. same

C. less

D. double

2153. When a step-input is given to an op-amp integrator, the output will be______________?
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A. A rectangular wave

B. A triangular wave with dc bias

C. A ramp

D. A sinusoidal wave

2154. A switchgear is device used for_____________?
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A. interrupting an electrical circuit

B. switching an electrical circuit 111.

C. switching, controlling and protecting the electrical circuit and equipment

D. switching and controlling an electrical circuit

2155. The commonly used material for shielding or screening magnetism is____________?
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A. brass

B. copper

C. aluminium

D. soft iron
2156. Substances which have permeability less than the permeability of free space are known as_____________?
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A. paramagnetic

B. ferromagnetic

C. bipolar

D. diamagnetic
2157. The power loss is an important factor for the design of_______________?
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A. motor

B. generator

C. transmission line

D. feeder

2158. Air blast circuit breaker is used for_____________?
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A. intermittant duty

B. over currents

C. repeated duty

D. short duty

2159. The ionization potential of mercury is approximately_____________?
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A. 10.4 V

B. 8.4 V

C. 16.4 V

D. 5.4 V

2160. Indicate which of the following material does not retain magnetism permanently
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A. Stainless steel

B. Soft iron

C. None of the above

D. Hardened steel

2161. The attraction capacity of electromagnet will increase if the_______________?
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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 ?
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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 ?
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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____________?
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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______________?
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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_________________?
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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______________?
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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__________?
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A. 600800 V

B. 200-100 V

C. 17002000 V

D. 10001200 V

2169. The bar magnet has____________?
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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________________?
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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_____________?
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A. cobalt

B. nickel

C. chromium

D. tungsten

2172. In a three-phase mercury arc rectifiers each anode conducts for____________?
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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 ?
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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________________?
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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___________?
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A. 1000 A

B. 2000 A

C. 500 A

D. 1500 A

2176. A permanent magnet______________?
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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__________________?
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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_______________?
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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____________?
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A. fast switches

B. relays

C. fuses

D. circuit breakers

2180. In a mercury arc rectifier characteristic blue luminosity is due to_____________?
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A. high temperature

B. electron streams

C. ionization

D. colour of mercury

2181. The stray line of magnetic flux is defined as_____________?
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A. a line of magnetic flux which does not follow the designed path

B. the mean length of a ring shaped coil

C. a line of magnetic flux in a non-uniform field

D. a line vertical to the flux lines

2182. The output voltage Vo of the above circuit is____________?
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A. -1.2V

B. -0.2V

C. -6V

D. -5V
2183. A magnetic field exists around____________?
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A. moving charges

B. aluminium

C. iron

D. copper

2184. The single phasing relays are used for the protection of_____________?
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A. three phase motors

B. two single phase motors running in parallel

C. two phase motors only

D. single phase motors only

2185. A.C. network analyser is used to solve problems of_______________?
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A. load flow and short-circuit

B. load flow

C. load flow, short-circuit and stability

D. none of the above

E. load flow and stability

2186. A rotary converter in general construction and design, is more or less like___________?
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A. a transformer

B. an alternator

C. any D.C. machine

D. an induction motor

2187. The relative permeability is less than unity is case of_____________?
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A. non-ferrous materials

B. ferrites

C. ferromagnetic materials

D. diamagnetic materials
2188. Flemings left hand rule is used to find_________________?
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A. direction of magnetic field due to current carrying conductor

B. direction of flux in a solenoid

C. polarity of a magnetic pole

D. direction of force on a current carrying conductor in a magnetic field
2189. Air blast circuit breakers for 400 kV power system are designed to operate in_______________?
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A. 0.5 sec

B. 100 microsecond

C. 0.1 sec

D. 50 millisecond
2190. Which of the following is a ferromagnetic material ?
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A. Nickel

B. Tungsten

C. Aluminium

D. Copper

2191. The relay operating speed depends upon_________________?
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A. the rate of flux built up

B. all of the above

C. armature core air gap

D. the spring tension

2192. A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ?
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A. 633.8 N/Wb

B. 63.38 N/Wb

C. 6338 N/Wb

D. 63380 N/Wb

2193. When an iron piece is placed in a magnetic field_____________?
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A. the magnetic field will not be affected

B. the magnetic lines of force will bend away from their usual paths in order to go away from the piece

C. the magnetic lines of force will bend away from their usual paths in order to pass through the piece

D. the iron piece will break

2194. Protection by fuses is generally not used beyond__________?
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A. 200 A

B. 50 A

C. 100 A

D. 20 A

2195. Susceptibility is positive for______________?
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A. ferromagnetic substances

B. none of the above

C. non-magnetic substances

D. diamagnetic substances

2196. In a transistor, signal is transferred from a___________circuit?
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A. low resistance to low resistance

B. high resistance to high resistance

C. high resistance to low resistance

D. low resistance to high resistance
2197. A zener diode is destroyed if it______________?
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A. none of the above

B. is reverse biased

C. carrier more than rated current

D. is forward biased

2198. _____________ filter circuit results in the best voltage regulation?
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A. choke input

B. resistance input

C. capacitor input

D. none of the above

2199. Radiations from a black body are proportional to____________?
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A. T2

B. T*

C. T3

D. T1

2200. Ground resistance should be designed such that_____________?
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A. grounding resistance should be as low as possible

B. grounding resistance should be always zero

C. none of the above

D. grounding resistance should be as high as possible