Govt Exams Mock Test FREE | Online Quiz Competition

Q1. A 3-phase transmission line operating at \(V_s = 400 kV\) and it's \(ABCD\) parameters \(A= D = 0.9∠0°, B = 100∠°90 \Omega, C = 0.6 \times 10^{-6}∠90° \mho\). Calculate the charging current under no load condition.

\(0.16 \angle 90^\circ A / phase\)

\(0.25 \angle 90^\circ A / phase\)

\(0.16 \angle -90^\circ A / phase\)

\(0.25 \angle -90^\circ A / phase\)

Q2. In transmission line:

Inductance > capacitance

Inductance < capacitance

Inductance = capacitance

None of the above

Q3. The zero-sequence network equivalent for the transformer connected between buses 1 and 2 as shown in Fig. is

Q4. In a three phase system, line losses are

Directly proportional to \(\cos \phi\)

Inversely proportional to \(\cos \phi\)

Directly proportional to \(\cos ^2 \phi\)

Inversely proportional to \(\cos^2 \phi\)

Q5. The line currents in amperes in phases a, b and c respectively are 500 +j150, 100 – j600 and – 300 + j600 referred to the same reference vector with phase sequence of 'abc'. Find the symmetrical component of currents.

\(I_{a0} = (100 + j50)\) A

\(I_{a1} = (546.41 + j165.47)\) A
\(I_{a2} = (-146.41 - j65.47)\) A

\(I_{a0} = (100 + j50)\) A

\(I_{a1} = (146.41 + j65.47)\) A

\(I_{a2} = (546.41 - j165.47)\) A

\(I_{a0} = (100 + j50)\) A

\(I_{a1} = (200 + j107.75)\) A

\(I_{a2} = (200 - j107.75)\) A

\(I_{a0} = (100 + j50)\) A

\(I_{a1} = (546.41 + j165.47)\) A
\(I_{a2} = (546.41 - j165.47)\) A

Q6. In case of interconnected power system, if the input to the prime mover of an alternator is kept constant but the excitation is changed, then the

Reactive component of the output is changed

Active component of the output is changed

Power factor of the load remains constant

Power factor of the load becomes zero.

Q7. A transmission line is compensated with shunt capacitance in such a way, the new surge impedance \(Z_s ^{'}\) will become \(350 \Omega\). The surge impedance of uncompensated line is \(Z_s = 400 \Omega\). Find the degree of shunt compensation.

0.1

0.15

0.2

0.3

Q8. Consider the power system network shown in Figure. Generator reactance and terminal voltages are given as: \(X_d^{'}=0.2\) p.u. and \(V_t=1.0\) p.u. Transformer reactance is \(0.1\) p.u. Infinite bus voltage is \(1.0\) p.u. Generator is feeding \(1.0\) p.u power to the infinite bus. Calculate the maximum steady-state power limit that can be transferred when the system is healthy.

\(3.49\) p.u

\(2.09\) p.u

\(5.69\) p.u

\(5.29\) p.u

Q9. Three generators are connected in parallel whose ratings are as follows: \(G_1: 100 MVA, 12 kV, X_{g1} = 0.1 pu\) \(G_2: 200 MVA, 12 kV, X_{g2} = 0.15 pu\) \(G_3: 150 MVA, 15 kV, X_{g3} = 0.15 pu\) Find the equivalent per unit reactance of the system on 200 MVA, 15 kV system base.

0.43 pu

0.043 pu

0.19 pu

0.019 pu

Q10. A loss less transmission line has a length of \(500 km\), find the phase shift of voltage signal.

\(30 ^\circ\)

\(35 ^\circ\)

\(25^\circ\)

\(15 ^\circ\)

Quiz

Year 2024

April
Week # 2 Quiz 4

Q1. A 3-phase transmission line operating at \(V_s = 400 kV\) and it's \(ABCD\) parameters \(A= D = 0.9∠0°, B = 100∠°90 \Omega, C = 0.6 \times 10^{-6}∠90° \mho\). Calculate the charging current under no load condition.

Q2. In transmission line:

Q3. The zero-sequence network equivalent for the transformer connected between buses 1 and 2 as shown in Fig. is

Q4. In a three phase system, line losses are

Q5. The line currents in amperes in phases a, b and c respectively are 500 +j150, 100 – j600 and – 300 + j600 referred to the same reference vector with phase sequence of 'abc'. Find the symmetrical component of currents.

Q6. In case of interconnected power system, if the input to the prime mover of an alternator is kept constant but the excitation is changed, then the

Q7. A transmission line is compensated with shunt capacitance in such a way, the new surge impedance \(Z_s ^{'}\) will become \(350 \Omega\). The surge impedance of uncompensated line is \(Z_s = 400 \Omega\). Find the degree of shunt compensation.

Q9. Three generators are connected in parallel whose ratings are as follows: \(G_1: 100 MVA, 12 kV, X_{g1} = 0.1 pu\) \(G_2: 200 MVA, 12 kV, X_{g2} = 0.15 pu\) \(G_3: 150 MVA, 15 kV, X_{g3} = 0.15 pu\) Find the equivalent per unit reactance of the system on 200 MVA, 15 kV system base.

Q10. A loss less transmission line has a length of \(500 km\), find the phase shift of voltage signal.

Quiz

Year 2024

July Week # 1 Expire on 31 Jul 2024

July Week # 2 Expire on 07 Aug 2024

July Week # 3 Expire on 14 Aug 2024

July Week # 4 Expire on 21 Aug 2024

April Week # 2 Quiz 4

Q1. A 3-phase transmission line operating at \(V_s = 400 kV\) and it's \(ABCD\) parameters \(A= D = 0.9∠0°, B = 100∠°90 \Omega, C = 0.6 \times 10^{-6}∠90° \mho\). Calculate the charging current under no load condition.

Q2. In transmission line:

Q3. The zero-sequence network equivalent for the transformer connected between buses 1 and 2 as shown in Fig. is

Q4. In a three phase system, line losses are

Q5. The line currents in amperes in phases a, b and c respectively are 500 +j150, 100 – j600 and – 300 + j600 referred to the same reference vector with phase sequence of 'abc'. Find the symmetrical component of currents.

Q6. In case of interconnected power system, if the input to the prime mover of an alternator is kept constant but the excitation is changed, then the

Q7. A transmission line is compensated with shunt capacitance in such a way, the new surge impedance \(Z_s ^{'}\) will become \(350 \Omega\). The surge impedance of uncompensated line is \(Z_s = 400 \Omega\). Find the degree of shunt compensation.

Q9. Three generators are connected in parallel whose ratings are as follows: \(G_1: 100 MVA, 12 kV, X_{g1} = 0.1 pu\) \(G_2: 200 MVA, 12 kV, X_{g2} = 0.15 pu\) \(G_3: 150 MVA, 15 kV, X_{g3} = 0.15 pu\) Find the equivalent per unit reactance of the system on 200 MVA, 15 kV system base.

Q10. A loss less transmission line has a length of \(500 km\), find the phase shift of voltage signal.

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April
Week # 2 Quiz 4