MCQOPTIONS
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MCQOPTIONS
This section includes 65 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering Questions knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following materials is not used for transmission and distribution of electrical power________________? |
| A. | Copper |
| B. | Aluminium |
| C. | Steel |
| D. | Tungsten |
| Answer» E. | |
| 2. |
When the interconnector between two stations has large reactance? |
| A. | the transfer of power will take place with voltage fluctuation and noise |
| B. | the transfer of power will take place with least loss |
| C. | the stations will fall out of step be¬cause of large angular displacement between the stations |
| D. | none of the above |
| Answer» D. none of the above | |
| 3. |
When an alternator connected to the bus-bar is shut down the bus-bar voltage will___________? |
| A. | fall |
| B. | rise |
| C. | remain unchanged |
| D. | none of the above |
| Answer» D. none of the above | |
| 4. |
When a conductor carries more current on the surface as compared to core, it is due to___________? |
| A. | permeability variation |
| B. | corona |
| C. | skin effect |
| D. | unsymmetrical fault |
| E. | none of the above |
| Answer» D. unsymmetrical fault | |
| 5. |
Transmission voltage of 11 kV is normally used for distances up to_____km? |
| A. | 20—25 km |
| B. | 40—50 km |
| C. | 60—70 km |
| D. | 80—100 km |
| Answer» B. 40—50 km | |
| 6. |
Transmitted power remaining the same, if supply voltage of a D.C. 2-wire feeder is increased 100 percent, saving in copper is____________________? |
| A. | 25 percent |
| B. | 50 percent |
| C. | 75 percent |
| D. | 100 percent |
| Answer» C. 75 percent | |
| 7. |
There is a greater possibility of occurence of corona during______________? |
| A. | dry weather |
| B. | winter |
| C. | summer heat |
| D. | humid weather |
| E. | none of the above |
| Answer» E. none of the above | |
| 8. |
The wooden poles well impregnated with creosite oil or any preservative compound have life_____________? |
| A. | from 2 to 5 years |
| B. | 10 to 15 years |
| C. | 25 to 30 years |
| D. | 60 to 70 years |
| Answer» D. 60 to 70 years | |
| 9. |
The voltage of the single phase supply to residential consumers is_____________? |
| A. | 110 V |
| B. | 210 V |
| C. | 230 V |
| D. | 400 V |
| Answer» D. 400 V | |
| 10. |
The voltage regulation in magnetic amplifier type voltage regulator is effected by__________? |
| A. | electromagnetic induction |
| B. | varying the resistance |
| C. | varying the reactance |
| D. | variable transformer |
| Answer» D. variable transformer | |
| 11. |
The voltage drop, for constant voltage transmission is compensated by installing__________? |
| A. | inductors |
| B. | capacitors |
| C. | synchronous motors |
| D. | all of above |
| E. | none of the above |
| Answer» D. all of above | |
| 12. |
The usual spans with R.C.C. poles are_______________? |
| A. | 40—50 meters |
| B. | 60—100 meters |
| C. | 80—100 meters |
| D. | 300—500 meters |
| Answer» D. 300—500 meters | |
| 13. |
The use of strain type insulators is made where the conductors are__________? |
| A. | dead ended |
| B. | at intermediate anchor towers |
| C. | any of the above |
| D. | none of the above |
| Answer» D. none of the above | |
| 14. |
The underground system cannot be operated above_________________? |
| A. | 440 V |
| B. | 11 kV |
| C. | 33 kV |
| D. | 66 kV |
| Answer» E. | |
| 15. |
The steel used in steel cored conductors is usually__________? |
| A. | alloy steel |
| B. | stainless steel |
| C. | mild steel |
| D. | high speed steel |
| E. | all of the above |
| Answer» D. high speed steel | |
| 16. |
The square root of the ratio of line impedance and shunt admittance is called the___________? |
| A. | surge impedance of the line |
| B. | conductance of the line |
| C. | regulation of the line |
| D. | none of the above |
| Answer» B. conductance of the line | |
| 17. |
The spacing between phase conductors of a 220 kV line is approximately equal to________________? |
| A. | 2 m |
| B. | 3.5 m |
| C. | 6 m |
| D. | 8.5 m |
| Answer» D. 8.5 m | |
| 18. |
The skin effect of a conductor will reduce as the__________? |
| A. | resistivity of conductor material increases |
| B. | permeability of conductor material increases |
| C. | diameter increases |
| D. | frequency increases |
| Answer» B. permeability of conductor material increases | |
| 19. |
The presence of ozone due to corona is harmful because it________________? |
| A. | reduces power factor |
| B. | corrodes the material |
| C. | gives odour |
| D. | transfer energy to the ground |
| E. | none of the above |
| Answer» C. gives odour | |
| 20. |
The power transmitted will be maximum when____________? |
| A. | corona losses are minimum |
| B. | reactance is high |
| C. | sending end voltage is more |
| D. | receiving end voltage is more |
| Answer» B. reactance is high | |
| 21. |
The power factor of industrial loads is generally______________? |
| A. | unity |
| B. | lagging |
| C. | leading |
| D. | zero |
| Answer» C. leading | |
| 22. |
The phenomenon qf rise in voltage at the receiving end of the open-circuited or lightly loaded line is called the________________? |
| A. | Seeback effect |
| B. | Ferranti effect |
| C. | Raman effect |
| D. | none of the above |
| Answer» C. Raman effect | |
| 23. |
The operating voltage of high voltage cables is up to_______________? |
| A. | l.lkV |
| B. | 3.3kV |
| C. | 6.6kV |
| D. | llkV |
| Answer» E. | |
| 24. |
The operating voltage of supertension cables is up to_________________? |
| A. | 3.3 kV |
| B. | 6.6 kV |
| C. | 11 kV |
| D. | 33 kV |
| Answer» E. | |
| 25. |
The operating voltage of extra high tension cables is upto_______________? |
| A. | 6.6 kV |
| B. | 11 kV |
| C. | 33 kV |
| D. | 66 kV |
| E. | 132 kV |
| Answer» E. 132 kV | |
| 26. |
The minimum clearance between the ground and a 220 kV line is about_________________? |
| A. | 4.3 m |
| B. | 5.5 m |
| C. | 7.0 m |
| D. | 10.5 m |
| Answer» D. 10.5 m | |
| 27. |
The material generally used for armour of high voltage cables is_____________? |
| A. | aluminium |
| B. | steel |
| C. | brass |
| D. | copper |
| Answer» C. brass | |
| 28. |
The material commonly used for sheaths of underground cables is______________? |
| A. | lead |
| B. | rubber |
| C. | copper |
| D. | iron |
| Answer» B. rubber | |
| 29. |
The material commonly used for insulation in high voltage cables is_______________? |
| A. | lead |
| B. | paper |
| C. | rubber |
| D. | none of the above |
| Answer» C. rubber | |
| 30. |
The loads on distributors systems are generally__________________? |
| A. | balanced |
| B. | unbalanced |
| C. | either of the above |
| D. | none of the above |
| Answer» C. either of the above | |
| 31. |
The frequency of voltage generated, in case of generators, can be increased by___________? |
| A. | using reactors |
| B. | increasing the load |
| C. | adjusting the governor |
| D. | reducing the terminal voltage |
| E. | none of the above |
| Answer» D. reducing the terminal voltage | |
| 32. |
The following system is not generally used? |
| A. | 1-phase 3 wire |
| B. | 1-phase 4 wire |
| C. | 3-phase 3 wire |
| D. | 3-phase 4 wire |
| Answer» B. 1-phase 4 wire | |
| 33. |
The effect of corona can be detected by___________? |
| A. | presence of ozone detected by odour |
| B. | hissing sound |
| C. | faint luminous glow of bluish colour |
| D. | all of the above |
| Answer» E. | |
| 34. |
The distributors for residential areas are______________? |
| A. | single phase |
| B. | three-phase three wire |
| C. | three-phase four wire |
| D. | none of the above |
| Answer» D. none of the above | |
| 35. |
The current drawn by the line due to corona losses is___________? |
| A. | non-sinusoidal |
| B. | sinusoidal |
| C. | triangular |
| D. | square |
| Answer» B. sinusoidal | |
| 36. |
The corona is considerably affected by which of the following _______________? |
| A. | Size of the conductor |
| B. | Shape of the conductor |
| C. | Surface condition of the conductor |
| D. | All of the above |
| Answer» E. | |
| 37. |
The angular displacement between two interconnected stations is mainly due to___________? |
| A. | armature reactance of both alternators |
| B. | reactance of the interconnector |
| C. | synchronous reactance of both the alternators |
| D. | all of the above |
| Answer» B. reactance of the interconnector | |
| 38. |
Pin type insulators are generally not used for voltages beyond_________? |
| A. | 1 kV |
| B. | 11 kV |
| C. | 22 kV |
| D. | 33 kV |
| Answer» E. | |
| 39. |
Owing to skin effect: |
| A. | current flows through the half cross-section of the conductor |
| B. | portion of the conductor near the surface carries more current and core of the conductor carries less current |
| C. | portion of the conductor near the surface carries less current and core of the conductor carries more cur¬rent |
| D. | any of the above |
| E. | none of the above |
| Answer» C. portion of the conductor near the surface carries less current and core of the conductor carries more cur¬rent | |
| 40. |
Overhead system can be designed for operation up to____________? |
| A. | 11 kV |
| B. | 33 kV |
| C. | 66 kV |
| D. | 400 kV |
| Answer» E. | |
| 41. |
Overhead lines generally use__________________? |
| A. | copper conductors |
| B. | all aluminium conductors |
| C. | A.C.S.R. conductors |
| D. | none of these |
| Answer» D. none of these | |
| 42. |
Multicore cables generally use________________? |
| A. | square conductors |
| B. | circular conductors |
| C. | rectangular conductors |
| D. | sector-shaped conductors |
| E. | none of the above |
| Answer» E. none of the above | |
| 43. |
Most of the high transmission lines in Pakistan are_______________? |
| A. | underground |
| B. | overhead |
| C. | either of the above |
| D. | none of the above |
| Answer» C. either of the above | |
| 44. |
Large industrial consumers are supplied electrical energy at__________________? |
| A. | 400 V |
| B. | 11 kV |
| C. | 66 kV |
| D. | 400 kV |
| Answer» C. 66 kV | |
| 45. |
jCorona usually occurs when the electrostatic stress in air around the conductor exceeds? |
| A. | 6.6 kV (r.m.s. value)/cm |
| B. | 11 kV (r.m.s. value)/cm |
| C. | 22 kV (maximum value)/cm |
| D. | 30 kV (maximum value)/cm |
| Answer» E. | |
| 46. |
In transmission lines the cross-arms are made of________________? |
| A. | copper |
| B. | wood |
| C. | R.C.C. |
| D. | steel |
| Answer» E. | |
| 47. |
In aluminium conductors, steel core is provided to____________? |
| A. | compensate for skin effect |
| B. | neutralise proximity effect |
| C. | reduce line inductance |
| D. | increase the tensile strength |
| Answer» E. | |
| 48. |
In AC.S.R. conductors, the insulation between aluminium and steel conductors is_________? |
| A. | insulin |
| B. | bitumen |
| C. | varnish |
| D. | no insulation is required |
| Answer» E. | |
| 49. |
In a tap changing transformer, the tappings are provided on__________? |
| A. | primary winding |
| B. | secondary winding |
| C. | high voltage winding |
| D. | any of the above |
| Answer» D. any of the above | |
| 50. |
In a substation the following equipment is not installed? |
| A. | exciters |
| B. | series capacitors |
| C. | shunt reactors |
| D. | voltatre transformers |
| Answer» B. series capacitors | |