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GETCO Exam Paper (30-11-2008)

GETCO Exam Paper (30-11-2008)
In distance protection, the relay measures _____ impedance of the line from relay up to the fault point.

positive sequence
zero sequence
negative sequence
self

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GETCO Exam Paper (30-11-2008)
On a long high voltage transmission line with heavy load, VAR compensation can be provided by using

shunt inductive reactors
series capacitors
shunt capacitors
series inductive reactors

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GETCO Exam Paper (30-11-2008)
Dynamic stability characteristics are predominant in the period

between the time the governors start reacting and when the steady-state stability is reached
both (b) & (c )
while governor is in action
immediately following a loss of load

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GETCO Exam Paper (30-11-2008)
Transient stability of a power system depends on

All of these
fault-clearing time
the strength of transmission network
the short circuit ratio of generating units

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GETCO Exam Paper (30-11-2008)
Steady - state stability limit of a power system means that the system is capable of maintaining

synchronism between machines and on external tie lines
All of these
the frequency at 50 Hz exactly
a constant power flow throughout

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GETCO Exam Paper (30-11-2008)
If a power system is transiently stable, it

will oscillate beyond the first swing
is always dynamically stable
both (a) & (c )
may be dynamically unstable

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