# For a long uncompensated line the limit to the line loading is governed by

1.  thermal limit

2.  voltage drop

3.  stability limit

4.  corona loss

4

stability limit

Explanation :
No Explanation available for this question

# With 100 % inductive shunt compensation, the voltage profile is flat for

4.  none of these

4

Explanation :
No Explanation available for this question

# The capacitance and inductance per unit length of a line operating at 110 kV are 0.01 kV are 0.01μF and 2 mH. The surge impedance loading of the line is

1.  40 MVA

2.  30 MVA

3.  27 MVA

4.  none of these

4

27 MVA

Explanation :
No Explanation available for this question

# Three insulating materials with breakdown strengths of 250 kV/cm, 200 kV/cm, 1.50 kV/cm and permittivities of 2.5, 3.0 and 3.5 are used in a single core cable. If the factor of safety for the materials is 5, then location of the materials with respect to -the core of the cable will be

1.  2.5,3.0, 3.5

2.  3.0, 2.5, 3.5

3.  3.5, 3.0, 2.5

4.  3.5,2.5,3.0

4

2.5,3.0, 3.5

Explanation :
No Explanation available for this question

# The L/C ratio for 132 kV and 400 kV lines are, typically 160 x 103 and 62.5 x 103 respectively The. natural 3 - phase loading for the two lines will be respectively

1.  108.9 and 2560 MW

2.  44 and 2560 MW

3.  44 and 640 MW

4.  640 and 44 MW

4

44 and 640 MW

Explanation :
No Explanation available for this question

# Corona losses, are minimized when

1.  conductors size is reduced

2.  smooth conductor is reduced

3.  sharp points are provided m the line hardware

4.  current density in conductors is reduced

4

smooth conductor is reduced

Explanation :
No Explanation available for this question

# The function of the earth wire in an extra high voltage line is to

1.  prevent earth fault

2.  provide a safety measure for any high-flying object

3.  provide a shield to the phase conductors from direct lightning stroke

4.    provide mechanical strength to the towers

4

provide a shield to the phase conductors from direct lightning stroke

Explanation :
No Explanation available for this question

# A square matrix is called singular if its

1.  determina is unity

2.  determinant is zero

3.  determinant is infinity

4.  rank is unity

4

determinant is zero

Explanation :
No Explanation available for this question

# In the solution of load-flow equation, Newton-Raphason (NR) method is superior to the Gauss-seidel (GS) method, because the

1.  time taken to perform one iteration in the NR method is less when compared to the time taken in the GS method

2.  number of iterations required in the NR method is more when compared to that in the GS method

3.  number of iterations :required is not independent of the size of the system in the NR method

4.  convergence characteristics of the NR method are not affected by the selection of slack bus

4

convergence characteristics of the NR method are not affected by the selection of slack bus

Explanation :
No Explanation available for this question

# In case of a 3 phase short circuit in a system the power fed into the system is

1.  mostly reactive

2.  mostly active

3.  active and reactive both equal

4.  reactive only

4