Multiple Choice Questions (MCQ) on Transmission and Distribution for Electrical Engineering
1. The underground system cannot be operated above
(a) 440 V
(b) 11 kV
(c) 33 kV
(d) 66 kV
Ans: d
2. Overhead system can be designed for operation up to
(a) 11 kV
(b) 33 kV
(c) 66 kV
(d) 400 kV
Ans: d
3. 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
(e) Possibility of carrying increased power for a given conductor size in case of long-distance heavy power transmission
Ans: a
4. A booster is a
(a) series-wound generator
(b) shunt wound generator
(c) synchronous generator
(d) none of the above
Ans: a
5. The distributors for residential areas are
(a) single phase
(b) three-phase three wire
(c) three-phase four wire
(d) none of the above
Ans: c
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6. The conductors of the overhead lines are
(a) solid
(b) stranded
(c) both solid and stranded
(d) none of the above
Ans:b
7. High voltage transmission lines use
(a) suspension insulators
(b) pin insulators
(c) both (a) and (b)
(d) none of the above
Ans: a
8. The loads on distributors systems are generally
(a) balanced
(b) unbalanced
(c) either of the above
(d) none of the above
Ans: b
9. In transmission lines the cross-arms are made of
(a) copper
(b) wood
(c) R.C.C.
(d) steel
Ans: d
10. The material generally used for armor of high voltage cables is
(a) aluminium
(b) steel
(c) brass
(d) copper
Ans: b
11. 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
Ans: c
12. 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
Ans: c
13. 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
Ans: b
14. 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
Ans: b
15. A feeder, in a transmission system, feeds power to
(a) distributors
(b) generating stations
(c) service mains
(d) all of the above
Ans: a
16. Which of the following materials is used for overhead transmission lines?
(a) Steel cored aluminum
(b) Galvanised steel
(c) Cadmium copper
(d) Any of the above
Ans: d
17. There is a greater possibility of occurrence of corona during
(a) dry weather
(b) winter
(c) summer heat
(d) humid weather
(e) none of the above
Ans: d
18. 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
Ans: c
19. Which of the following distribution systems is more reliable?
(a) Radial system
(b) Tree system
(c) Ring main system
(d) All are equally reliable
Ans: c
20. Transmission voltage of ll kV is normally used for distances up to
(a) 20—25 km
(b) 40—50 km
(c) 60—70 km
(d) 80—100 km
Ans: a
21. A conductor, due to sag between two supports, takes the form of
(a) semi-circle
(b) triangle
(c) ellipse
(d) catenary
Ans: d
22. In AC.S.R. conductors, the insulation between aluminum and steel conductors is
(a) insulin
(b) bitumen
(c) varnish
(d) no insulation is required
Ans: d
23. By which of the following methods string efficiency can be improved?
(a) Using a guard ring
(b) Grading the insulator
(c) Using long cross arm
(d) Any of the above
(e) None of the above
Ans: d
24. 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
Ans: d
25. In a substation, the following equipment is not installed
(a) exciters
(b) series capacitors
(c) shunt reactors
(d) voltage transformers
Ans: a
26. 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
Ans: c
27. The current drawn by the line due to corona losses is
(a) non-sinusoidal
(b) sinusoidal
(c) triangular
(d) square
Ans: a
28. Pin type insulators are generally not used for voltages beyond
(a) 1 kV
(b) 11 kV
(c) 22 kV
(d) 33 kV
Ans: d
29. Aluminium has a specific gravity of
(a) 1.5
(b) 2.7
(c) 4.2
(d) 7.8
Ans: b
30. 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
Ans: d
31. 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
Ans: c
32. 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
Ans: c
33. Electro-mechanical voltage regulators are generally used in
(a) reactors
(b) generators
(c) transformers
(d) all of the above
Ans: b
34. 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
Ans: a
35. When a live conductor of public electric supply breaks down and touches the earth which of the 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
(e) None of the above
Ans: a
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2. Overhead system can be designed for operation up to
ReplyDelete(a) 11 kV
(b) 33 kV
(c) 66 kV
(d) 400 kV IS THIS RIGHT ANSWER?
Ans: d
Yes According to Option 400 KV is Right Answer.
DeleteIn India highest over head line 765 kv
DeleteWhat is spacing between conductors for 400 kV line.
ReplyDelete8 meter
DeleteAround 8 meter
ReplyDeleteVERY NICE INFORMATION
ReplyDeleteThanks for posting...😊 Useful for various competitions...
ReplyDelete