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Electrical Engineering
Transmission And Distribution
Quiz 2
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Q.1
The angular displacement between two interconnected stations is mainly due to
Armature reactance of both alternators
Reactance of the interconnector
Synchronous reactance of both the alternators
All of the above
Q.2
The operating voltage of super-tension cables is up to
3.3 kV
6.6 kV
11 kV
33 kV
Q.3
Which of the following is the demerit of a 'constant voltage transmission system'?
Increase of short-circuit current of the system
Availability of steady voltage at all loads at the line terminals
Possibility of better protection for the line due to possible use of higher terminal reactants
Improvement of power factor at times of moderate and heavy loads
Q.4
Electromechanical voltage regulators are generally used in
Reactors
Generators
Transformers
All of the above
Q.5
Which of the following D.C. distribution system is the simplest and lowest in first cost?
Radial system
Ring system
Interconnected system
None of the above
Q.6
Aluminium has a specific gravity of
1.5
2.7
4.2
7.8
Q.7
In AC.S.R. Conductors, the insulation between aluminium and steel conductors is
Insulin
Bitumen
Varnish
No insulation is required
Q.8
Which of the following regulations is considered best?
50 %
20 %
10 %
2 %
Q.9
Overhead lines generally use
Copper conductors
All aluminium conductors
A.C.S.R. conductors
None of these
Q.10
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
One-fourth
One-third
One-half
Twice
Q.11
The current drawn by the line due to corona losses is
Non-sinusoidal
Sinusoidal
Triangular
Square
Q.12
By which of the following systems electric power may be transmitted?
Overhead system
Underground system
Both (A) and (B)
None of the above
Q.13
Low voltage cables are meant for use up to
1.1 kV
3.3 kV
6.6 kV
11 kV
Q.14
Transmitted power remaining the same, if supply voltage of a D.C. 2-wire feeder is increased 100 percent, saving in copper is
25 percent
50 percent
75 percent
100 percent
Q.15
are the conductors, which connect the consumer's terminals to the distribution
Distributors
Service mains
Feeders
None of the above
Q.16
The material commonly used for sheaths of underground cables is
Lead
Rubber
Copper
Iron
Q.17
For which of the following equipment current rating is not necessary?
Circuit breakers
Isolators
Load break switch
Circuit breakers and load break switches
Q.18
For an overhead line, the surge impedance is taken as
20-30 ohms
70-80 ohms
100-200 ohms
500-1000 ohms
Q.19
Which of the following distribution systems is more reliable?
Radial system
Tree system
Ring main system
All are equally reliable
Q.20
The usual spans with R.C.C. poles are
40-50 meters
60-100 meters
80-100 meters
300-500 meters
Q.21
The phenomenon of rise in voltage at the receiving end of the open-circuited or lightly loaded line is called the
See-back effect
Ferranti effect
Raman effect
None of the above
Q.22
Series capacitors on transmission lines are of little use when the load VAR requirement is
Large
Small
Fluctuating
Any of the above
Q.23
The distributors for residential areas are
Single phase
Three-phase three wire
Three-phase four wire
None of the above
Q.24
The material commonly used for insulation in high voltage cables is
Lead
Paper
Rubber
None of the above
Q.25
The voltage drop, for constant voltage transmission is compensated by installing
Inductors
Capacitors
Synchronous motors
All of above
Q.26
The operating voltage of extra high tension cables is upto
6.6 kV
11 kV
33 kV
66 kV
Q.27
Most of the high voltage transmission lines in India are
Underground
Overhead
Either of the above
None of the above
Q.28
There is a greater possibility of occurrence of corona during
Dry weather
Winter
Summer heat
Humid weather
Q.29
By which of the following methods string efficiency can be improved?
Using a guard ring
Grading the insulator
Using long cross arm
Any of the above
Q.30
The power factor of industrial loads is generally
Unity
Lagging
Leading
Zero
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