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Free download in PDF Transmission Line Short Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like IIT-JEE, B-Tech etc. These short solved questions or quizzes are provided by Gkseries.
41
Transmission voltage of ll kV is normally used for distances upto
[A]
20—25 km
[B]
40—50 km
[C]
60—70 km
[D]
All of the above
42
Which of the following regulations is considered best?
[A]
50%
[B]
20%
[C]
10%
[D]
2%
43
Which of the following bus-bar schemes has the lowest cost ?
[A]
Ring bus-bar scheme
[B]
Single bus-bar scheme
[C]
Breaker and a half scheme
[D]
Main and transfer scheme
Answer: Single bus-bar scheme
44
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
45
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
Answer: Current, voltage, frequency and short time current
46
For which of the following equipment current rating is not necessary ?
[A]
Circuit breakers
[B]
Isolators
[C]
Load break switch
[D]
none of the above
47
jCorona usually occurs when the electrostatic stress in air around the conductor exceeds
[A]
6.6 kV (r.m.s. value)/cm
[B]
11 kV (r.m.s. value)/cm
[C]
22 kV (maximum value)/cm
[D]
30 kV (maximum value)/cm
Answer: 30 kV (maximum value)/cm
48
The current drawn by the line due to corona losses is
[A]
non-sinusoidal
[B]
sinusoidal
[C]
triangular
[D]
square
49
Pin type insulators are generally not used for voltages beyond
[A]
1 kV
[B]
11 kV
[C]
22 kV
[D]
33 kV
50
Aluminium has a specific gravity of
[A]
1.5
[B]
2.7
[C]
4.2
[D]
7.8
51
For transmission of power over a distance of 200 km, the transmission voltage should be
[A]
132 kV
[B]
66 kV
[C]
33 kV
[D]
11 kV
52
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
Answer: Booster transformer
53
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
Answer: high voltage winding
54
On which of the following factors skin effect depends ?
[A]
Frequency of the current
[B]
Size of the conductor
[C]
Resistivity of the conductor material
[D]
All of the above
55
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
56
Electro-mechanical voltage regulators are generally used in
[A]
Reactors
[B]
Generators
[C]
Transformers
[D]
All Of The Above
57
When a conductor carries more current on the surface as compared to core, it is due to
[A]
permeability variation
[B]
corona
[C]
skin effect
[D]
unsymmetrical fault
58
The following system is not generally used
[A]
1-phase 3 wire
[B]
1-phase 4 wire
[C]
3-phase 3 wire
[D]
None of the above
59
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]
None of the above
Answer: Current will flow to earth
60
The voltage regulation in magnetic amplifier type voltage regulator is effected by
[A]
electromagnetic induction
[B]
varying the resistance
[C]
varying the reactance
[D]
All of the above
Answer: varying the reactance
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