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Year 2024
April
Week # 1
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FAQs
April
Week # 2 Quiz 5
Q1.
What is the maximum length of a 1-phase transmission line having copper conductor of 0.7\(cm^2\) cross-section, over which 180 kW at unity power factor and at 3600 V are to be delivered? The efficiency of transmission is 90% (Take specific resistance as 1.4 \(\mu\)\(\Omega\) cm.)
12.5 km
10 km
20 km
13.7 km
Q2.
The inductance of transmission line is 1mH/km. If the spacing between conductors is made double the new inductance of line will be approx.
2 mH/km.
2.5 mH/km.
0.87 mH/km.
1.3 mH/km.
Q3.
The size of jacobian matrix of a 13 bus power system with 5 voltage controlled buses and a slack bus is
21 * 21
15 * 15
19 * 19
17 * 17
Q4.
Which type of relay is less affected by power surges?
Mho relay
Reactance relay
Impedance relay
All are same
Q5.
The time-current graph of a fuse
has linear characteristic
is a circle
has inverse characteristic
none of the above
Q6.
For a relay, whose relay setting is 50% and the CT ratio is 500/5. What will be the value of fault current when the plug setting multiplier is 8.
3000A
2000A
4000A
1000A
Q7.
Surge impedance loading of a transmission line can be increased by
increasing its voltage level
addition of lumped inductance in parallel
addition of lumped capacitance in series
both A & C
Q8.
A 30 MVA, 33 kV transformer has a per unit impedance of 0.75. The per unit impedance at a new base 60 MVA and 11 kV is
0.166 pu
3.375 pu
13.5 pu
0.5 pu
Q9.
Statement 1: The admittance matrix will be singular for a power system network which is not having any shunt element.
Statement 2: The admittance matrix will be non-singular for a power system network which is not having any shunt element
Which of the aforementioned statements is true?
Statement 1
Statement 2
Both statements
Neither Statement 1 nor Statement 2
Q10.
The following sequence currents were recorded in a power system under a fault condition: \(I_{positive} = j1.653 \: p.u. , I_{negative} = -j0.5 \: p.u. \: and \: I_{zero} = -j 1.153 \: p.u.\). The fault is
Single line to ground
Three phase
Double line to ground
Line to line
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