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Free download in PDF Transmission Line Objective Type 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.
(21)
Which of the following are the constants of the transmission lines ?
[A]
Resistance
[B]
Inductance
[C]
Capacitance
[D]
All of the above
(22)
The square root of the ratio of line impedance and shunt admittance is called the
[A]
surge impedance of the line
[B]
conductance of the line
[C]
regulation of the line
[D]
none of the above
Answer: surge impedance of the line
(23)
The operating voltage of high voltage cables is up to
[A]
l.lkV
[B]
3.3kV
[C]
6.6kV
[D]
llkV
(24)
The operating voltage of extra high tension cables is upto
[A]
6.6 kV
[B]
11 kV
[C]
33 kV
[D]
66 kV
(25)
Which of the following methods is used for laying of underground cables ?
[A]
Direct laying
[B]
Draw-in-system
[C]
Solid system
[D]
All of the above
(26)
A booster is a
[A]
series wound generator
[B]
shunt wound generator
[C]
synchronous generator
[D]
none of the above
Answer: series wound generator
(27)
The voltage of the single phase supply to residential consumers is
[A]
110 V
[B]
210 V
[C]
230 V
[D]
400 V
(28)
Multicore cables generally use
[A]
square conductors
[B]
circular conductors
[C]
rectangular conductors
[D]
sector-shaped conductors
Answer: sector-shaped conductors
(29)
Distribution lines in India generally use
[A]
wooden poles
[B]
R.C.C. poles
[C]
steel towers
[D]
none of the above
(30)
Overhead lines generally use
[A]
copper conductors
[B]
all aluminium conductors
[C]
A.C.S.R. conductors
[D]
none of these
Answer: A.C.S.R. conductors
31
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
32
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
33
As compared to a 2-wire D.C. distributor, a 3-wire distributor with same maximum voltage to earth uses only
[A]
31.25 percent of copper
[B]
33.3 percent of copper
[C]
66.7 percent of copper
[D]
125 percent of copper
Answer: 31.25 percent of copper
34
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
35
For an overhead line, the surge impedance is taken as
[A]
20-30 ohms
[B]
70—80 ohms
[C]
100—200 ohms
[D]
500—1000 ohms
36
A 3-phase 4 wire system is commonly used on
[A]
primary transmission
[B]
secondary transmission
[C]
primary distribution
[D]
secondary distribution
Answer: secondary distribution
37
Which of the following is not a constituent for making porcelain insulators ?
[A]
Quartz
[B]
Kaolin
[C]
Felspar
[D]
Silica
38
Which of the following relays is used on long transmission lines ?
[A]
Impedance relay
[B]
Mho’s relay
[C]
Reactance relay
[D]
None of the above
39
Which of the following distribution systems is more reliable ?
[A]
Radial system
[B]
Tree system
[C]
Ring main system
[D]
All are equally reliable
40
Which of the following characteristics should the line supports for transmission lines possess ?
[A]
Low cost
[B]
High mechanical strength
[C]
Longer life
[D]
All of the above
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