Model Quiz Transmission and Distribution Questions and Answers test2

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1. Which of the following is usually not the generating voltage ?
6.6 kV	8.8 kV
11 kV	13.2 kV

2. For an overhead line, the surge impedance is taken as ______.
20-30 ohms	70—80 ohms
100—200 ohms	500—1000 ohms

3. The presence of ozone due to corona is harmful because it ______.
reduces power factor	corrodes the material
gives odour	transfer energy to the ground

4. A feeder, in a transmission system, feeds power to ______.
distributors	generating stations
service mains	all of the above

5. The power transmitted will be maximum when ______.
corona losses are minimum	reactance is high
sending end voltage is more	receiving end voltage is more

6. A 3-phase 4 wire system is commonly used on _______.
primary transmission	secondary transmission
primary distribution	secondary distribution

7. Which of the following materials is used for overhead transmission lines ?
Steel cored aluminium	Galvanised steel
Cadmium copper	Any of the above

8. Which of the following is not a constituent for making porcelain insulators ?
Quartz	Kaolin
Felspar	Silica

9. There is a greater possibility of occurence of corona during ______.
dry weather	winter
summer heat	humid weather

10. Which of the following relays is used on long transmission lines ?
Impedance relay	Mho's relay
Reactance relay	None of the above

11. The steel used in steel cored conductors is usually ______.
alloy steel	stainless steel
mild steel	high speed steel

12. Which of the following distribution systems is more reliable ?
Radial system	Tree system
Ring main system	All are equally reliable

13. Which of the following characteristics should the line supports for transmission lines possess ?
Low cost	High mechanical strength
Longer life	All of the above

14. Transmission voltage of llkV is normally used for distances upto _______.
20—25 km	40—50 km
60—70 km	80—100 km

15. Which of the following regulations is considered best?
50%	20%
10%	2%

16. Skin effect is proportional to ______.
diameter of conductor	(diameter of conductor) 1/2
(diameter of conductor )/2	(diameter of conductor )2

17. A conductor, due to sag between two supports, takes the form of _______.
semi-circle	triangle
ellipse	catenary

18. In AC.S.R. conductors, the insulation between aluminium and steel conductors is _______.
insulin	bitumen
varnish	no insulation is required

19. Which of the following bus-bar schemes has the lowest cost ?
Ring bus-bar scheme	Single bus-bar scheme
Breaker and a half scheme	Main and transfer scheme

20. Owing to skin effect ________.
current flows through the half cross-section of the conductor	portion of the conductor near the surface carries more current and core of the conductor carries less current
portion of the conductor near the surface carries less current and core of the conductor carries more current	any of the above