Govt Exams Mock Test FREE | Online Quiz Competition

Q1. In a power system with negligible resistance, the fault current at a point is 10 p.u. The series reactance to be included at the fault point to limit the short-circuit current to 5 p.u. is

5 p.u

10 p.u.

0.1 p.u.

0.5 p.u.

Q2. A transmission line has impedance of \((0.001 + j0.01) \: pu\). Find the line at which maximum value of negative DC off set current is produced, if it is applied with \(V_m \cos\omega t.\)

9.68 ms

12.8 ms

1 ms

4.68 ms

Q3. 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 \(\cos^2 \phi\)

Q4. 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

Q5. In a load flow problem solved by Newton-Raphson method with polar coordinates, the size of the Jacobian is 75 x 75. If there are 25 PV buses in addition to PQ buses and a slack bus, the total number of buses in the system is ________.

75

51

76

50

Q6. A shunt reactor at 200 MVAr is operated at 99% of its rated voltage and at 97% of its rated frequency. The reactive power absorbed by the reactor is

197.94 MVAr

202.08 MVAr

204.12 MVAr

195.96 MVAr

Q7. The network shown in Fig. has impedance in p.u. as indicated. The diagonal element \(Y_{22}\) of the bus admittance matrix \(Y_{bus}\) of the network is _______.

\(Y_{22} = + j19.90\)

\(X_{22} = - j10.00\)

\(Y_{22} = - j19.90\)

\(Y_{22} = + j10.0\)

Q8. A three-phase, 12 kV, 50 Hz and 300 kW load is operating at 0.8 pf lag. If the pf is to be improved to unity, using star connected capacitor, the per phase value of the reactive VAR required is:

100 kVAR

50 kVAR

25 kVAR

75 kVAR

Q9. The annual load duration curve is a straight line from 20 MW to 6 MW. Find the load factor.

75%

65%

50%

85%

Q10. The network shown in fig has impedances in p.u. as indicated. The diagonal element \(Y_{22}\) of the bus admittance matrix \(Y_{bus}\) of the network is

\(-j19.8\)

\(j20\)

\(0.2\)

\(-j19.95\)

Quiz

Year 2024

September
Week # 2 Quiz 4

Q1. In a power system with negligible resistance, the fault current at a point is 10 p.u. The series reactance to be included at the fault point to limit the short-circuit current to 5 p.u. is

Q2. A transmission line has impedance of \((0.001 + j0.01) \: pu\). Find the line at which maximum value of negative DC off set current is produced, if it is applied with \(V_m \cos\omega t.\)

Q3. In a three phase system, line losses are

Q4. The size of jacobian matrix of a 13 bus power system with 5 voltage controlled buses and a slack bus is

Q5. In a load flow problem solved by Newton-Raphson method with polar coordinates, the size of the Jacobian is 75 x 75. If there are 25 PV buses in addition to PQ buses and a slack bus, the total number of buses in the system is ________.

Q6. A shunt reactor at 200 MVAr is operated at 99% of its rated voltage and at 97% of its rated frequency. The reactive power absorbed by the reactor is

Q7. The network shown in Fig. has impedance in p.u. as indicated. The diagonal element \(Y_{22}\) of the bus admittance matrix \(Y_{bus}\) of the network is _______.

Q8. A three-phase, 12 kV, 50 Hz and 300 kW load is operating at 0.8 pf lag. If the pf is to be improved to unity, using star connected capacitor, the per phase value of the reactive VAR required is:

Q9. The annual load duration curve is a straight line from 20 MW to 6 MW. Find the load factor.

Q10. The network shown in fig has impedances in p.u. as indicated. The diagonal element \(Y_{22}\) of the bus admittance matrix \(Y_{bus}\) of the network is

Quiz

Year 2024

August Week # 4 Expire on 21 Sep 2024

September Week # 1 Expire on 30 Sep 2024

September Week # 2 Expire on 07 Oct 2024

September Week # 3 Expire on 14 Oct 2024

September Week # 2 Quiz 4

Q1. In a power system with negligible resistance, the fault current at a point is 10 p.u. The series reactance to be included at the fault point to limit the short-circuit current to 5 p.u. is

Q2. A transmission line has impedance of \((0.001 + j0.01) \: pu\). Find the line at which maximum value of negative DC off set current is produced, if it is applied with \(V_m \cos\omega t.\)

Q3. In a three phase system, line losses are

Q4. The size of jacobian matrix of a 13 bus power system with 5 voltage controlled buses and a slack bus is

Q5. In a load flow problem solved by Newton-Raphson method with polar coordinates, the size of the Jacobian is 75 x 75. If there are 25 PV buses in addition to PQ buses and a slack bus, the total number of buses in the system is ________.

Q6. A shunt reactor at 200 MVAr is operated at 99% of its rated voltage and at 97% of its rated frequency. The reactive power absorbed by the reactor is

Q7. The network shown in Fig. has impedance in p.u. as indicated. The diagonal element \(Y_{22}\) of the bus admittance matrix \(Y_{bus}\) of the network is _______.

Q8. A three-phase, 12 kV, 50 Hz and 300 kW load is operating at 0.8 pf lag. If the pf is to be improved to unity, using star connected capacitor, the per phase value of the reactive VAR required is:

Q9. The annual load duration curve is a straight line from 20 MW to 6 MW. Find the load factor.

Q10. The network shown in fig has impedances in p.u. as indicated. The diagonal element \(Y_{22}\) of the bus admittance matrix \(Y_{bus}\) of the network is

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September
Week # 2 Quiz 4