| 1. | The area of cross-section of the neutral in a 3-wire D.C. system is generally the area of cross-section of main conductor ? | |
|
same as
|
||
|
one-fourth
|
||
|
one half
|
||
|
double
|
||
View Answer
Discuss in Forum
Report Question| 2. | In the design of a distributor which of the following is the major consideration ? | |
|
Voltage drop
|
||
|
Current carrying capacity
|
||
|
Frequency
|
||
|
kVA of system
|
||
| 3. | For which of the following, the excitation control method is satisfactory ? | |
|
Low voltage lines
|
||
|
High voltage lines
|
||
|
Short lines
|
||
|
Long lines
|
||
| 4. | Which of the following bar schemes is the most expensive ? | |
|
Double bus-bar double breaker
|
||
|
Ring bus-bar scheme
|
||
|
Single bus-bar scheme
|
||
|
Main and transfer scheme
|
||
| 5. | When a live conductor of public electric supply breaks down and touches the earth which of the following will happen ? | |
|
Current will flow to earth
|
||
|
Supply voltage will drop
|
||
|
Supply voltage will increase
|
||
|
No current will flow in the conductor
|
||
| 6. | 310 km line is considered as ? | |
|
a long line
|
||
|
a medium line
|
||
|
a short line
|
||
|
any of the above
|
||
| 7. | When a conductor carries more current on the surface as compared to core, it is due to ? | |
|
permeability variation
|
||
|
corona
|
||
|
skin effect
|
||
|
unsymmetrical fault
|
||
| 8. | Which of the following is neglected in the analysis of short transmission lines ? | |
|
Series impedance
|
||
|
Shunt admittance
|
||
|
J2R loss
|
||
|
None of the above
|
||
| 9. | Skin effect exists only in ? | |
|
a.c. transmission
|
||
|
high voltage d.c. overhead transmission
|
||
|
low voltage d.c. overhead transmission
|
||
|
cables carrying d.c. current
|
||
| 10. | The string efficiency of an insulator can be increased by ? | |
|
correct grading of insulators of various capacitances
|
||
|
reducing the number of strings
|
||
|
increasing the number of strings in the insulator
|
||
|
none of the above
|
||