Electrical Engineering · Question Bank

Transmission Lines

97 of 168 questions match · page 2 of 5. Answer in your head first, then check the solution.

📘 EE Mock Board Exam
TypeAll 97Problem solving 17Objective 80
DifficultyAll 168Easy 97Medium 38Hard 33
✕ Clear filters
#21📜 EE Pre-Board March 2015📘 PowerhouseEasy
A string insulator has 5 units. The voltage across the bottom most until is 30% of the total voltage. What is the string efficiency?
A60%
B66.67%
C75%
D83.33%
#22📜 EE Pre-Board March 2015📘 PowerhouseEasy
The capacitance reactance of a transmission line is 90,000 ohms per kilometer. Find the total capacitance reactance if the transmission line is 50 km long.
A90,000 Ω
B\(4.5 \times 10^{6}\) Ω
C180,000 Ω
D1,800 Ω
#23📜 EE Pre-Board August 2015📘 PowerhouseEasy
A string insulator has 5 units. The voltage across the bottom most unit is 25% of the total voltage. What is the string efficiency?
A80%
B75%
C67%
D86%
#24📜 EE Pre-Board August 2015📘 PowerhouseEasy
The capacitive reactance of a transmission line is 90,000 ohms per kilometer. Find the total capacitive reactance if the transmission line is 60 km long.
A\(5.4 \times 10^{6}\) Ω
B1,500 Ω
C90,000 Ω
D180,000 Ω
#25📜 EE Pre-Board March 2016📘 PowerhouseEasy
The surge impedance of a transmission line is given by
A\(\sqrt{C/L}\)
B\(\sqrt{LC}\)
C\(1/\sqrt{LC}\)
D\(\sqrt{L/C}\)
#26📜 EE Pre-Board March 2016📘 PowerhouseEasy
Determine the total inductance of a single-phase overhead transmission line 10 km long. The diameter of each conductor is 0.8 cm and the distance between them is 1.2 meters.
A11.9 mH
B23.8 mH
C35.7 mH
D47.6 mH
#27📜 EE Pre-Board March 2016📘 PowerhouseEasy
A 100 km transmission line has a 1,000 ohms shunt reactance. What is the per km shunt reactance?
A1,000 Ω
B100,000 Ω
C10 Ω
D100 Ω
#28📜 EE Pre-Board March 2017📘 PowerhouseEasy
In a long transmission line at no load, the receiving end voltage as compared to the sending end voltage is (I) higher, (II) lower, (III) the same.
AI only
BII only
CEither I or II
DIII only
#29📜 EE Pre-Board March 2017📘 PowerhouseEasy
A distributor is designed from the point of view of
Avoltage drop
Bcurrent carrying capacity
Cvoltage drop and current
Dload capacity
#30📜 EE Pre-Board March 2017📘 PowerhouseEasy
The presence of an earth in case of overhead lines
Aincreases the capacitance
Bdecreases the capacitance
Cincreases the inductance
Ddecreases the inductance
#31📜 EE Pre-Board March 2017📘 PowerhouseEasy
A string insulator has 6 units. The voltage across the bottom most unit is 20% of the total voltage. Its string efficiency is
A20%
B60%
C75%
D83.3%
#32📜 EE Pre-Board March 2017📘 PowerhouseEasy
What is the empirical formula to calculate the number of strands?
A3n(n + 2n) + 2
B3n(n + 1) + 2
C3n(n + 1) + 1
D3n(3 + 3n) + 1
#33📜 EE Pre-Board March 2017📘 PowerhouseEasy
When bundled conductors are used in transmission lines, the effective capacitance and inductance will respectively
Adecrease and increase
Bincrease and decrease
Cremain same and increase
Ddecrease and remain same
#34📜 EE Pre-Board August 2017📘 PowerhouseEasy
A 100-km transmission line has a 1,200 Ω shunt reactance. What is the per km shunt reactance?
A12 Ω
B120,000 Ω
C1,200 Ω
D120 Ω
#35📜 EE Pre-Board March 2018📘 PowerhouseEasy
The capacitive reactance of a transmission line is 90,000 ohms per kilometer. Find the total capacitive reactance if the transmission line is 50-km long.
A\(4.5 \times 10^{6}\) Ω
B1,800 Ω
C90,000 Ω
D180,000 Ω
#36📜 EE Pre-Board March 2018📘 PowerhouseEasy
What is the source of heat generation in cables?
ACopper loss in conductor
BDielectric losses in cable insulation
CLosses in metallic sheathings and armouring
DAll of these
#37📜 EE Pre-Board March 2018📘 PowerhouseEasy
In a 3 core cable, the capacitance between two conductors is 3 μF. What will be the capacitance per phase?
A1.5 μF
B3 μF
C6 μF
D12 μF
#38📜 EE Pre-Board March 2018📘 PowerhouseEasy
A 100 km transmission line has a 1,200 ohms shunt reactance. What is the shunt reactance per km?
A1,200 Ω
B120,000 Ω
C12 Ω
D120 Ω
#39📜 EE Pre-Board August 2018📘 PowerhouseEasy
Which of the following parameters can be neglected for a short line?
Aresistance
Binductance
Creactance
Dcapacitance
#40📜 EE Pre-Board August 2018📘 PowerhouseEasy
Which of the following insulators will be selected for high voltage application?
Astrain type
Bdisc type
Csuspension type
Dpin type

More Electrical Engineering topics