MCQOPTIONS
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MCQOPTIONS
This section includes 517 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
If variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size of conductor will be most economical. This statement is known as |
| A. | Kelvin's law |
| B. | Ohm's law |
| C. | Kirchhoffs law |
| D. | Faraday's law |
| Answer» B. Ohm's law | |
| 2. |
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 | |
| 3. |
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. | |
| 4. |
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 | |
| 5. |
For transmission of power over a distance of 200 km, the transmission voltage should be |
| A. | 132 kV |
| B. | 66 kV |
| C. | 33 kV |
| D. | 11 kV |
| Answer» B. 66 kV | |
| 6. |
For transmission of power over a distance of 500 km, the transmission voltage should be in the range |
| A. | 150 to 220 kV |
| B. | 100 to 120 kV |
| C. | 60 to 100 kV |
| D. | 20 to 50 kV |
| Answer» B. 100 to 120 kV | |
| 7. |
For aluminium, as compared to copper, all the following factors have higher values except |
| A. | specific volume |
| B. | electrical conductivity |
| C. | co-efficient of linear expansion |
| D. | resistance per unit length for same cross-section |
| Answer» C. co-efficient of linear expansion | |
| 8. |
Series capacitors on transmission lines are of little use when the load VAR requirement is |
| A. | large |
| B. | small |
| C. | fluctuating |
| D. | any of the above |
| Answer» C. fluctuating | |
| 9. |
As compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage to earth uses only |
| A. | 31.25 percent of copper |
| B. | 33.3 percent of copper |
| C. | 66.7 percent of copper |
| D. | 125 percent of copper |
| Answer» B. 33.3 percent of copper | |
| 10. |
Which of the following equipment, for regulating the voltage in distribution feeder, will be most economical ? |
| A. | Static condenser |
| B. | Synchronous condenser |
| C. | Tap changing transformer |
| D. | Booster transformer |
| Answer» E. | |
| 11. |
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 v^lue)/cm |
| Answer» E. | |
| 12. |
When a live conductor of public electric supply breaks down and touches the earth which ofthe following will happen ? |
| A. | Current will flow to earth |
| B. | Supply voltage will drop |
| C. | Supply voltage will increase |
| D. | No current will flow in the conductor |
| Answer» B. Supply voltage will drop | |
| 13. |
Transmitted power remaining the same, if supply voltage of a D.C. 2-wire feeder is increased100 percent, saving in copper is |
| A. | 25 percent |
| B. | 50 percent |
| C. | 75 percent |
| D. | 100 percent |
| Answer» C. 75 percent | |
| 14. |
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. | |
| 15. |
Multicore cables generally use |
| A. | square conductors |
| B. | circular conductors |
| C. | rectangular conductors |
| D. | sector-shaped conductors |
| Answer» E. | |
| 16. |
Which of the following equipment, for regulating the voltage in distribution feeder, will bemost economical ? |
| A. | Static condenser |
| B. | Synchronous condenser |
| C. | Tap changing transformer |
| D. | Booster tr |
| Answer» B. Synchronous condenser | |
| 17. |
Which of the following bus-bar schemes has the lowest cost ? |
| A. | Ring bus-bar scheme |
| B. | Single bus-bar scheme |
| C. | Breaker and a half scheme |
| D. | Main and tr |
| Answer» D. Main and tr | |
| 18. |
Which of the following is the demerit of a ‘constant voltage transmission system’ ? |
| A. | Increase of short-circuit current of the system |
| B. | Availability of steady voltage at all loads at the line terminals |
| C. | Possibility of better protection for the line due to possible use of higher terminal reactants |
| D. | Improvement of power factor at times of moderate and heavy loads |
| Answer» B. Availability of steady voltage at all loads at the line terminals | |
| 19. |
Which of the following materials is not used for transmission and distribution of electricalpower ? |
| A. | Copper |
| B. | Aluminium |
| C. | Steel |
| D. | Tungsten |
| Answer» E. | |
| 20. |
are the conductors, which connect the consumer’s terminals to the distribution |
| A. | Distributors |
| B. | Service mains |
| C. | Feeders |
| D. | None of the above |
| Answer» C. Feeders | |
| 21. |
For transmission of power over a distance of 500 km, the transmission voltage should be inthe range |
| A. | 150 to 220 kV |
| B. | 100 to 120 kV |
| C. | 60 to 100 kV |
| D. | 20 to 50 kV |
| Answer» B. 100 to 120 kV | |
| 22. |
Which of the following is the source of heat generation in the cables ? |
| A. | Dielectric losses in cable insulation |
| B. | losses in the conductor |
| C. | Losses in the metallic sheathings and armourings |
| D. | All of the above |
| Answer» E. | |
| 23. |
The phenomenon qf rise in voltage at the receiving end of the open-circuited or lightly loadedline is called the |
| A. | Seeback effect |
| B. | Ferranti effect |
| C. | Raman effect |
| D. | none of the above |
| Answer» C. Raman effect | |
| 24. |
By which of the following systems electric power may be transmitted ? |
| A. | Overhead system |
| B. | Underground system |
| C. | Both (a) and (b) |
| D. | None of the above |
| Answer» D. None of the above | |
| 25. |
As compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage toearth uses only |
| A. | 31.25 percent of copper |
| B. | 33.3 percent of copper |
| C. | 66.7 percent of copper |
| D. | 125 percent of copper |
| Answer» B. 33.3 percent of copper | |
| 26. |
Which of the following D.C. distribution system is the simplest and lowest in first cost ? |
| A. | Radial system |
| B. | Ring system |
| C. | Inter-connected system |
| D. | None of the above |
| Answer» B. Ring system | |
| 27. |
Transmission voltage of llkV is normally used for distances upto |
| A. | 20—25 km |
| B. | 40—50 km |
| C. | 60—70 km |
| D. | 80—100 km |
| Answer» B. 40—50 km | |
| 28. |
For transmission of power over a distance of 200 km, the transmission voltage shouldbe |
| A. | 132 kV |
| B. | 66 kV |
| C. | 33 kV |
| D. | 11 kV |
| Answer» B. 66 kV | |
| 29. |
Series capacitors on transmission lines are of little use when the load VARrequirement is |
| A. | large |
| B. | small |
| C. | fluctuating |
| D. | any of the above |
| Answer» C. fluctuating | |
| 30. |
Which of the following relays is used on long transmission lines ? |
| A. | Impedance relay |
| B. | Mho's relay |
| C. | Reactance relay |
| D. | None of the above |
| Answer» C. Reactance relay | |
| 31. |
For transmission of power over a distance of 500 km, the transmission voltage shouldbe in the range |
| A. | 150 to 220 kV |
| B. | 100 to 120 kV |
| C. | 60 to 100 kV |
| D. | 20 to 50 kV |
| Answer» B. 100 to 120 kV | |
| 32. |
Which of the following characteristics should the line supports for transmission lines possess ? |
| A. | Low cost |
| B. | High mechanical strength |
| C. | Longer life |
| D. | All of the above |
| Answer» E. | |
| 33. |
Overhead system can be designed for operation upto |
| A. | 11 kV |
| B. | 33 kV |
| C. | 66 kV |
| D. | 400 kV |
| Answer» D. 400 kV | |
| 34. |
jCorona usually occurs when the electrostatic stress in air around the conductorexceeds |
| 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 v^lue)/cm |
| Answer» E. | |
| 35. |
Which of the following methods is used for laying of underground cables ? |
| A. | Direct laying |
| B. | Draw-in-system |
| C. | Solid system |
| D. | All of the above |
| Answer» E. | |
| 36. |
The operating voltage of supertension cables is upto |
| A. | 3.3 kV |
| B. | 6.6 kV |
| C. | 11 kV |
| D. | 33 kV |
| Answer» E. | |
| 37. |
In the analysis of which of the following lines shunt capacitance is neglected ? |
| A. | Short transmission lines |
| B. | Medium transmission lines |
| C. | Long transmission lines |
| D. | Medium as well as long transmission lines |
| Answer» B. Medium transmission lines | |
| 38. |
As compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximumvoltage to earth uses only |
| A. | 31.25 percent of copper |
| B. | 33.3 percent of copper |
| C. | 66.7 percent of copper |
| D. | 125 percent of copper |
| Answer» B. 33.3 percent of copper | |
| 39. |
Which of the following is usually not the generating voltage ? |
| A. | 6.6 kV |
| B. | 8.8 kV |
| C. | 11 kV |
| D. | 13.2 kV |
| Answer» C. 11 kV | |
| 40. |
There is a greater possibility of occurence of corona during |
| A. | dry weather |
| B. | winter |
| C. | summer heat |
| D. | humid weather |
| Answer» E. | |
| 41. |
A 3-phase 4 wire system is commonly used on |
| A. | primary transmission |
| B. | secondary transmission |
| C. | primary distribution |
| D. | secondary distribution |
| Answer» E. | |
| 42. |
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. | |
| 43. |
Which of the following is not a constituent for making porcelain insulators ? |
| A. | Quartz |
| B. | Kaolin |
| C. | Felspar |
| D. | Silica |
| Answer» E. | |
| 44. |
By which of the following a bus-bar is rated ? |
| A. | Current only |
| B. | Current and voltage |
| C. | Current, voltage and frequency |
| D. | Current, voltage, frequency and short time current |
| Answer» E. | |
| 45. |
Due to which of the following reasons the cables should not be operated too hot ? |
| A. | The oil may loose its viscosity and it may start drawing off from higher levels |
| B. | Expansion of the oil may cause the sheath to burst |
| C. | Unequal expansion may create voids in the insulation which will lead to ionization |
| D. | All of the above |
| Answer» E. | |
| 46. |
For aluminium, as compared to copper, all the following factors have higher valuesexcept |
| A. | specific volume |
| B. | electrical conductivity |
| C. | co-efficient of linear expansion |
| D. | resistance per unit length for same cross-section |
| Answer» C. co-efficient of linear expansion | |
| 47. |
Electro-mechanical voltage regulators are generally used in |
| A. | reactors |
| B. | generators |
| C. | transformers |
| D. | all of the above |
| Answer» C. transformers | |
| 48. |
The operating voltage of high voltage cables is upto |
| A. | l.lkV |
| B. | 3.3kV |
| C. | 6.6kV |
| D. | llkV |
| Answer» E. | |
| 49. |
Galvanised steel wire is generally used as |
| A. | stay wire |
| B. | earth wire |
| C. | structural components |
| D. | all of the above |
| Answer» E. | |
| 50. |
For which of the following equipment current rating is not necessary ? |
| A. | Circuit breakers |
| B. | Isolators |
| C. | Load break switch |
| D. | Circuit breakers and load break switches |
| Answer» C. Load break switch | |