# The synchronizing coefficient between two areas of the 2-area power system is (symbols have usual meanings)

1.  ∂P/∂IVI

2.  ∂P/∂δ

3.  ∂P/∂f

4.  ∂P/∂Q 6

4

∂P/∂δ

Explanation :
No Explanation available for this question

# The critical clearing time of a fault in power systems is related to

1.  reactive power limit

2.  short-circuit current limit

4.  transient stability limit

4

transient stability limit

Explanation :
No Explanation available for this question

# If two pole 50 Hz, 50 MVA, turbo generator has a moment of inertia of 9 x 103 kg-m2, then kinetic energy in MJ at rated speed will be

1.  400 MG

2.  420 MG

3.  444 MJ

4.  500MJ

4

444 MJ

Explanation :
No Explanation available for this question

# If two pole 50 Hz, 50 MVA turbo generator has a moment of inertia of 8.6 x 103kg-m2, then inretia constants H in MJ/MVA will be

1.  7.21

2.  8.48

3.  9.10

4.  4.39

4

8.48

Explanation :
No Explanation available for this question

# A surge of 15 kV magnitude travels along a cable towards its junction with a overhead line. If inductance and capacitance of the cable and overhead line are respectively 0.3 mH, 0.4 H and 1.5 mH, 0.012 H per km, the voltage rise at the junction due to the surge, will be

1.  27.87 kV

2.  82.27 kV

3.  78.28 kV

4.  none of these

4

27.87 kV

Explanation :
No Explanation available for this question

# The transient stability of the power system can be effectively improved by

1.  excitation control

2.  phase shifting transformer

3.  single pole switching of circuit breakers

4.  increasing the turbine valve opening

4

single pole switching of circuit breakers

Explanation :
No Explanation available for this question

# Bulk power transmission over long HVDC lines are preferred, on account of

1.  low cost of HVDC terminals

2.  no harmonic problems

3.  minimum line power losses

4.  simple protection

4

no harmonic problems

Explanation :
No Explanation available for this question

# The main consideration for higher and higher operating voltage of transmission is to

1.  increase efficiency of transmission

2.  reduce power losses

3.  increase power transfer capability

4.  both (a) and (b)

4

increase power transfer capability

Explanation :
No Explanation available for this question

# In a high voltage do transmission scheme, reactive power is needed both for rectifier at the sending-end and, for inverter at the receiving-end.-During the operation of such a de link, rectifier. receives

1.  lagging reactive power and the inverter supplies leading, reactive power

2.  leading reactive power, and the inverter supplies lagging reactive power

3.  lagging reactive power and the inverter supplies lagging reactive power

4

lagging reactive power and the inverter supplies leading, reactive power

Explanation :
No Explanation available for this question

# A 500 MVA, 11 kV synchronous generator, has 0.2 p.u. synchronous reactance. The p.u. Synchronous reactance on the base values of 100 MVA and 22 kV is

1.  0.16

2.  0.01

3.  4.0

4.  0.25

4

4.0

Explanation :
No Explanation available for this question

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