Govt Exams Mock Test FREE | Online Quiz Competition

Q1. In the network as shown in Fig, the marked parameters are p.u. impedances. The bus-admittance matrix of the network is

\(Y_{bus} = \begin{bmatrix}-j5 & j5 \\j5 & -j5 \end{bmatrix}\)

\(Y_{bus} = \begin{bmatrix}-j10 & j5 \\j5 & -j10 \end{bmatrix}\)

\(Y_{bus} = \begin{bmatrix}-j10 & j5 \\j5 & -j5 \end{bmatrix}\)

\(Y_{bus} = \begin{bmatrix}-j10 & j10 \\j10 & -j5 \end{bmatrix}\)

Q2. A transmission line is compensated with shunt capacitance. If the uncompensated transmission line surge impedance loading is \(SIL =400 MW\) and compensated transmission line has surge impedance loading has \(SIL^{'} = 500 MW\). Find the degree of shunt compensation.

0.3

0.4

0.56

0.7

Q3. 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.

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

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

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

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

Q4. With the increase in the load power factor, the efficiency of the transmission line

Decreases.

Remains unchanged.

Increases.

Exhibits a maximum.

Q5. A power system needs injection of VARs at

both peak and off-peak load

off peak load

full load

peak load

Q6. The design of insulation in EHV lines is based on

Lightning voltage

Corona

Switching voltage

Radio interference

Q7. For a 500 Hz frequency Excitation, a 50 km long power line will be modelled as

Short line

Medium line

Long line

Data insufficient for decision

Q8. The sequence components of the fault current are as follows: \(i_+ = j1.5 \: p.u., i_- = – j0.5 \: p.u., i_0 = –j1 \: p.u.\). The type of fault in the system is:

LG

LL

LLG

LLLG

Q9. A cable has the following characteristics, \(L = 0.3 \mu H/m\) and \(C = 200 pF/m\). The velocity of wave propagation through cable is

\(1.3 \times 10^5 km/s\)

\(1.3 \times 10^6 km/s\)

\(1.3 \times 10^7 km/s\)

\(1.3 \times 10^4 km/s\)

Q10. What is the unit of synchronizing coefficient 'T' ?

MW-s

MW/s

MW.rad

MW/rad

Quiz

Year 2025

August
Week # 2 Quiz 5

Q1. In the network as shown in Fig, the marked parameters are p.u. impedances. The bus-admittance matrix of the network is

Q2. A transmission line is compensated with shunt capacitance. If the uncompensated transmission line surge impedance loading is \(SIL =400 MW\) and compensated transmission line has surge impedance loading has \(SIL^{'} = 500 MW\). Find the degree of shunt compensation.

Q4. With the increase in the load power factor, the efficiency of the transmission line

Q5. A power system needs injection of VARs at

Q6. The design of insulation in EHV lines is based on

Q7. For a 500 Hz frequency Excitation, a 50 km long power line will be modelled as

Q8. The sequence components of the fault current are as follows: \(i_+ = j1.5 \: p.u., i_- = – j0.5 \: p.u., i_0 = –j1 \: p.u.\). The type of fault in the system is:

Q9. A cable has the following characteristics, \(L = 0.3 \mu H/m\) and \(C = 200 pF/m\). The velocity of wave propagation through cable is

Q10. What is the unit of synchronizing coefficient 'T' ?

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 5

Q1. In the network as shown in Fig, the marked parameters are p.u. impedances. The bus-admittance matrix of the network is

Q2. A transmission line is compensated with shunt capacitance. If the uncompensated transmission line surge impedance loading is \(SIL =400 MW\) and compensated transmission line has surge impedance loading has \(SIL^{'} = 500 MW\). Find the degree of shunt compensation.

Q4. With the increase in the load power factor, the efficiency of the transmission line

Q5. A power system needs injection of VARs at

Q6. The design of insulation in EHV lines is based on

Q7. For a 500 Hz frequency Excitation, a 50 km long power line will be modelled as

Q8. The sequence components of the fault current are as follows: \(i_+ = j1.5 \: p.u., i_- = – j0.5 \: p.u., i_0 = –j1 \: p.u.\). The type of fault in the system is:

Q9. A cable has the following characteristics, \(L = 0.3 \mu H/m\) and \(C = 200 pF/m\). The velocity of wave propagation through cable is

Q10. What is the unit of synchronizing coefficient 'T' ?

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August
Week # 2 Quiz 5