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.
| 51. |
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 |
| E. | none of the above |
| Answer» B. Ohm’s law | |
| 52. |
High voltage transmission lines use__________________? |
| A. | suspension insulators |
| B. | pin insulators |
| C. | both A. and B. |
| D. | none of the above |
| Answer» B. pin insulators | |
| 53. |
Galvanised steel wire is generally used as______________? |
| A. | stay wire |
| B. | earth wire |
| C. | structural components |
| D. | all of the above |
| Answer» E. | |
| 54. |
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 | |
| 55. |
For transmission of power over a distance of 200 km, the transmission voltage should be_________kv? |
| A. | 132 kV |
| B. | 66 kV |
| C. | 33 kV |
| D. | 11 kV |
| Answer» B. 66 kV | |
| 56. |
For an overhead line, the surge impedance is taken as________________? |
| A. | 20-30 ohms |
| B. | 70—80 ohms |
| C. | 100—200 ohms |
| D. | 500—1000 ohms |
| E. | none of the above |
| Answer» D. 500—1000 ohms | |
| 57. |
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 | |
| 58. |
Electro-mechanical voltage regulators are generally used in___________? |
| A. | reactors |
| B. | generators |
| C. | transformers |
| D. | all of the above |
| Answer» C. transformers | |
| 59. |
Constant voltage transmission entails the following disadvantage? |
| A. | large conductor area is required for same power transmission |
| B. | short-circuit current of the system is increased |
| C. | either of the above |
| D. | none of the above |
| Answer» C. either of the above | |
| 60. |
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 | |
| 61. |
_______________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 | |
| 62. |
Aluminium has a specific gravity of___________? |
| A. | 1.5 |
| B. | 2.7 |
| C. | 4.2 |
| D. | 7.8 |
| Answer» C. 4.2 | |
| 63. |
A uniformly-loaded D.C. distributor is fed at both ends with equal voltages. As compared to a similar distributor fed at one end only, the drop at the middle point is______________? |
| A. | one-fourth |
| B. | one-third |
| C. | one-half |
| D. | twice |
| E. | none of the above |
| Answer» B. one-third | |
| 64. |
A feeder, in a transmission system, feeds power to________________? |
| A. | distributors |
| B. | generating stations |
| C. | service mains |
| D. | all of the above |
| Answer» B. generating stations | |
| 65. |
A conductor, due to sag between two supports, takes the form of____________? |
| A. | semi-circle |
| B. | triangle |
| C. | ellipse |
| D. | catenary |
| Answer» E. | |