PYQs Based test 11: Power Systems

Base load power plants are

P. wind farms

Q. run – of – river plants

R. nuclear power plants

S. diesel power plants

Out of the following options, the most relevant information needed to specify the real power (P) at the PV buses in a load flow analysis is

A $50MVA,10kV,50Hz$, star-connected, unloaded three-phase alternator has a synchronous reactance of 1 p.u. and a sub-transient reactance of $0.2p.u.$ If a 3-phase short circuit occurs close to the generator terminals, the ratio of initial and final values of the sinusoidal component of the short circuit current is ________.

Determine the correctness or otherwise of the following Assertion (A) and the Reason (R).

Assertion (A) : Fast decoupled load flow method gives approximate load flow solution because it uses several assumptions.

Reason (R) : Accuracy depends on the power mismatch vector tolerance

In a load flow problem solved by Newton-Raphson method with polar coordinates, the size of the Jacobian is 100 × 100. If there are 20 PV buses in addition to PQ Buses and a slack bus, the total number of buses in the system is _________.