Govt Exams Mock Test FREE | Online Quiz Competition

Q1. Calculate the protection trip time of the inverse definite minimum time (IDMT) overcurrent relay, according to IEC 60255 protection curves. Assume very inverse curve type, relay pickup current = 1kA, fault current = 10 kA and time-multiplier setting (TMS) = 1.

2.1 s

0.5 s

0.8 s

1.5 s

Q2. A 1-phase transmission line has an impedance (3+4j) Ω . Find the power factor of the load for achieving maximum voltage regulation?

0.6 lag

0.8 lag

0.6 lead

0.8 lead

Q3. If the severity of single line-to-ground fault at the terminals of an unloaded synchronous generator is lesser than that of 3-phase faults, then __________ where, \(X_1\) is the positive sequence reactance of the generator,\(X_{g0}\) is the zero sequence reactance of the generator and\(X_n\) is the neutral reactance.

\(X_n=3(X_1-X_{g0})\)

\(X_n<\frac{1}{3}(X_1-X_{g0})\)

\(X_n=\frac{1}{3}(X_1-X_{g0})\)

\(X_n>\frac{1}{3}(X_1-X_{g0})\)

Q4. If the real power flow through the uncompensated line is 1 pu and the degree of series compensation ‘K’ is 0.5, the power flow through the series compensated line is

2 pu

0.5 pu

1 pu

4 pu

Q5. A generating station having 'n' section busbars each rated at Q kVA with \(x \%\) reactance is connected on the tie-bars system through busbar reactances of b%. Determine the short-circuit kVA if a 3-phase fault takes place on one section.

\(Q[\frac{1}{x}+\frac{n+1}{bn-x}]\)

\(Q[\frac{1}{x}-\frac{n+1}{bn-x}]\)

\(Q[\frac{1}{x}+\frac{n+1}{bn+x}]\)

\(Q[\frac{1}{x}+\frac{n-1}{bn+x}]\)

Q6. A 183-bus power system has 150 PQ buses and 32 PV buses. In the general case, to obtain the load flow solution using Newton-Raphson method in polar coordinates, the minimum number of simultaneous equations to be solved is _____________.

326

332

350

340

Q7. The power generated by two plants are: \(P_1=50 MW, P_2 = 40 MW\). If the loss coefficients are \(B_{11}=0.001, B_{22}=0.0025, B_{12}=-0.0005\), then the power loss will be

5.5 MW

6.5 MW

4.5 MW

8.5 MW

Q8. A single line diagram of a power system is shown if Fig. The diagonal elements of the \(Z_{bus}\) matrix are

\(Z_{11}=j0.3\:pu\) and \(Z_{22}=j0.3\:pu\)

\(Z_{11}=j0.2\:pu\) and \(Z_{22}=j0.2\:pu\)

\(Z_{11}=j0.3\:pu\) and \(Z_{22}=j0.2\:pu\)

\(Z_{11}=j0.2\:pu\) and \(Z_{22}=j0.3\:pu\)

Q9. Consider two buses is connected by an impedance of \((0+j5)\Omega\) The bus 1 voltage is \(100 \angle 30 ^\circ\) V, and bus 2 voltage is \(100 \angle0 ^\circ\) V. The real and reactive power supplied by bus 1, respectively are (Consider power flowing from bus 1 to 2 as positive)

1000 W, 268 Var

-1000 W, -134 Var

276.9 W. -56.7 Var

-276.9 W, 56.7 Var

Q10. If the severity of single line-to-ground fault at the terminals of an unloded star connected synchronous generator is greater than that of 3-phase faults, then _______ where, \(X_1\) is the positive sequence reactance of the generator, \(X_{g0}\) is the zero sequence reactance of the generator and \(X_n\) is the neutral reactance.

\(X_n=\frac{1}{3}(X_1-X_{g0})\)

\(X_n<\frac{1}{3}(X_1-X_{g0})\)

\(X_n=3(X_1-X_{g0})\)

\(X_n>\frac{1}{3}(X_1-X_{g0})\)

Quiz

Year 2024

December
Week # 2 Quiz 4

Q1. Calculate the protection trip time of the inverse definite minimum time (IDMT) overcurrent relay, according to IEC 60255 protection curves. Assume very inverse curve type, relay pickup current = 1kA, fault current = 10 kA and time-multiplier setting (TMS) = 1.

Q2. A 1-phase transmission line has an impedance (3+4j) Ω . Find the power factor of the load for achieving maximum voltage regulation?

Q4. If the real power flow through the uncompensated line is 1 pu and the degree of series compensation ‘K’ is 0.5, the power flow through the series compensated line is

Q5. A generating station having 'n' section busbars each rated at Q kVA with \(x \%\) reactance is connected on the tie-bars system through busbar reactances of b%. Determine the short-circuit kVA if a 3-phase fault takes place on one section.

Q6. A 183-bus power system has 150 PQ buses and 32 PV buses. In the general case, to obtain the load flow solution using Newton-Raphson method in polar coordinates, the minimum number of simultaneous equations to be solved is _____________.

Q7. The power generated by two plants are: \(P_1=50 MW, P_2 = 40 MW\). If the loss coefficients are \(B_{11}=0.001, B_{22}=0.0025, B_{12}=-0.0005\), then the power loss will be

Q8. A single line diagram of a power system is shown if Fig. The diagonal elements of the \(Z_{bus}\) matrix are

Q9. Consider two buses is connected by an impedance of \((0+j5)\Omega\) The bus 1 voltage is \(100 \angle 30 ^\circ\) V, and bus 2 voltage is \(100 \angle0 ^\circ\) V. The real and reactive power supplied by bus 1, respectively are (Consider power flowing from bus 1 to 2 as positive)

Quiz

Year 2024

November Week # 4 Expire on 21 Dec 2024

December Week # 1 Expire on 31 Dec 2024

December Week # 2 Expire on 07 Jan 2025

December Week # 3 Expire on 14 Jan 2025

December Week # 2 Quiz 4

Q1. Calculate the protection trip time of the inverse definite minimum time (IDMT) overcurrent relay, according to IEC 60255 protection curves. Assume very inverse curve type, relay pickup current = 1kA, fault current = 10 kA and time-multiplier setting (TMS) = 1.

Q2. A 1-phase transmission line has an impedance (3+4j) Ω . Find the power factor of the load for achieving maximum voltage regulation?

Q4. If the real power flow through the uncompensated line is 1 pu and the degree of series compensation ‘K’ is 0.5, the power flow through the series compensated line is

Q5. A generating station having 'n' section busbars each rated at Q kVA with \(x \%\) reactance is connected on the tie-bars system through busbar reactances of b%. Determine the short-circuit kVA if a 3-phase fault takes place on one section.

Q6. A 183-bus power system has 150 PQ buses and 32 PV buses. In the general case, to obtain the load flow solution using Newton-Raphson method in polar coordinates, the minimum number of simultaneous equations to be solved is _____________.

Q7. The power generated by two plants are: \(P_1=50 MW, P_2 = 40 MW\). If the loss coefficients are \(B_{11}=0.001, B_{22}=0.0025, B_{12}=-0.0005\), then the power loss will be

Q8. A single line diagram of a power system is shown if Fig. The diagonal elements of the \(Z_{bus}\) matrix are

Q9. Consider two buses is connected by an impedance of \((0+j5)\Omega\) The bus 1 voltage is \(100 \angle 30 ^\circ\) V, and bus 2 voltage is \(100 \angle0 ^\circ\) V. The real and reactive power supplied by bus 1, respectively are (Consider power flowing from bus 1 to 2 as positive)

Record & Track Your Performance

December
Week # 2 Quiz 4