Govt Exams Mock Test FREE | Online Quiz Competition

Q1. A 1200/5, C400 CT is connected on the 800/5 tap. What is the maximum secondary burden that can be used and still maintain rated accuracy at 18 times rated symmetrical secondary current?

0.15\(\Omega\)

6.66\(\Omega\)

0.33\(\Omega\)

2.96\(\Omega\)

Q2. A 440 V, three-phase, 50 Hz source is feeding a load of 250 kVA at 0.6 pf lagging. Find the kVAR to the capacitor bank required to improve the pf to 0.85 lag.

107 KVAR

307 KVAR

407 KVAR

207 KVAR

Q3. For 66 kV lines, the numbers of insulator discs used are,

3

12

8

5

Q4. The maximum and minimum stress in the dielectric of a single core cable are 80 kV/cm (rms) and 20 kV/cm (rms), respectively. If the conductor diameter is 4 cm, then find the thickness of insulation.

8 cm

12 cm

10 cm

6 cm

Q5. Over voltage protection is recommended for

Hydro turbine generator

steam turbine generator

Gas turbine generator

all of the above

Q6. The series impedance matrix of a short three phase transmission line in phase coordinates:
\(\begin{bmatrix} Z_s & Z_m & Z_m \\Z_m & Z_s & Z_m \\Z_m & Z_m & Z_s\end{bmatrix}\)
If the positive sequence impedance is \((1+j 10) \Omega\), and the zero sequence is \((4+j 31) \Omega\), then the imaginary part of \(Z_m\) in \(\Omega\) is:

3.5 Ω

0 Ω

14 Ω

7 Ω

Q7. 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

Q8. Determine the magnitudes of the symmetrical components \(IR_1, IR_2, IR_0\) of the currents in a three phase (RYB) three wire system, when a short circuit occurs between R and Y phase wires, the fault current being 200 A.

\(\lvert I_{R1}\rvert= \frac{100}{\sqrt{3}}A\), \(\lvert I_{R2}\rvert= \frac{100}{\sqrt{3}}A\), \(\lvert I_{R0}\rvert= \frac{100}{\sqrt{3}}A\)

\(\lvert I_{R1}\rvert= \frac{100}{\sqrt{3}}A\), \(\lvert I_{R2}\rvert= \frac{100}{\sqrt{3}}A\), \(\lvert I_{R0}\rvert=0A\)

\(\lvert I_{R1}\rvert= \frac{200}{\sqrt{3}}A\), \(\lvert I_{R2}\rvert= \frac{200}{\sqrt{3}}A\), \(\lvert I_{R0}\rvert=0A\)

\(\lvert I_{R1}\rvert= \frac{200}{\sqrt{3}}A\), \(\lvert I_{R2}\rvert= \frac{200}{\sqrt{3}}A\), \(\lvert I_{R0}\rvert=\frac{200}{\sqrt{3}}A\)

Q9. The base impedance and base voltage for a given single phase power system are 25Ω and 500 V respectively. The base kVA and base current is ________.

20 kVA and 5 A

5 kVA and 10 A

10 kVA and 20 A

10 kVA and 15 A

Q10. A 15-bus power system has 4 - voltage controlled buses. For the load flow analysis using Newton-Raphson method in polar coordinates, the size of the Jacobian matrix is__________.

11 * 11

15 * 15

24 * 24

30 * 30

Quiz

Year 2025

August
Week # 2 Quiz 4

Q1. A 1200/5, C400 CT is connected on the 800/5 tap. What is the maximum secondary burden that can be used and still maintain rated accuracy at 18 times rated symmetrical secondary current?

Q2. A 440 V, three-phase, 50 Hz source is feeding a load of 250 kVA at 0.6 pf lagging. Find the kVAR to the capacitor bank required to improve the pf to 0.85 lag.

Q3. For 66 kV lines, the numbers of insulator discs used are,

Q4. The maximum and minimum stress in the dielectric of a single core cable are 80 kV/cm (rms) and 20 kV/cm (rms), respectively. If the conductor diameter is 4 cm, then find the thickness of insulation.

Q5. Over voltage protection is recommended for

Q7. 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 ________.

Q8. Determine the magnitudes of the symmetrical components \(IR_1, IR_2, IR_0\) of the currents in a three phase (RYB) three wire system, when a short circuit occurs between R and Y phase wires, the fault current being 200 A.

Q9. The base impedance and base voltage for a given single phase power system are 25Ω and 500 V respectively. The base kVA and base current is ________.

Q10. A 15-bus power system has 4 - voltage controlled buses. For the load flow analysis using Newton-Raphson method in polar coordinates, the size of the Jacobian matrix is__________.

Quiz

Year 2025

December Week # 4 Expire on 21 Jan 2025

January Week # 1 Expire on 31 Jan 2025

January Week # 2 Expire on 07 Feb 2025

January Week # 3 Expire on 14 Feb 2025

August Week # 2 Quiz 4

Q1. A 1200/5, C400 CT is connected on the 800/5 tap. What is the maximum secondary burden that can be used and still maintain rated accuracy at 18 times rated symmetrical secondary current?

Q2. A 440 V, three-phase, 50 Hz source is feeding a load of 250 kVA at 0.6 pf lagging. Find the kVAR to the capacitor bank required to improve the pf to 0.85 lag.

Q3. For 66 kV lines, the numbers of insulator discs used are,

Q4. The maximum and minimum stress in the dielectric of a single core cable are 80 kV/cm (rms) and 20 kV/cm (rms), respectively. If the conductor diameter is 4 cm, then find the thickness of insulation.

Q5. Over voltage protection is recommended for

Q7. 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 ________.

Q8. Determine the magnitudes of the symmetrical components \(IR_1, IR_2, IR_0\) of the currents in a three phase (RYB) three wire system, when a short circuit occurs between R and Y phase wires, the fault current being 200 A.

Q9. The base impedance and base voltage for a given single phase power system are 25Ω and 500 V respectively. The base kVA and base current is ________.

Q10. A 15-bus power system has 4 - voltage controlled buses. For the load flow analysis using Newton-Raphson method in polar coordinates, the size of the Jacobian matrix is__________.

Record & Track Your Performance

August
Week # 2 Quiz 4