Transmission Line Quiz | Transmission Line Objective Type Questions and Answers

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Questions
21 Which of the following are the constants of the transmission lines ?
A Resistance
B Inductance
C Capacitance
D All of the above

Answer: 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
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23 The operating voltage of high voltage cables is up to
A l.lkV
B 3.3kV
C 6.6kV
D llkV

Answer: 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

Answer: 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

Answer: 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

Answer: 230 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

Answer: R.C.C. poles
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

Answer: 7.0 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

Answer: 50 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

Answer: 8.8 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

Answer: 100—200 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

Answer: 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

Answer: Mho’s relay
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

Answer: Ring main system
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

Answer: All of the above

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