GATE EE 2021 Paper 1 — page 7

Questions 19–21 of 65. Imported answers require review unless explicitly marked reviewed.

Paper practice 65 questionsPage 7 of 22

Consider a power system consisting of

number of buses. Buses in this power system are categorized into slack bus, PV buses and PQ buses for load flow study. The number of PQ buses is

. The balanced Newton-Raphson method is used to carry out load flow study in polar form,

and

are sub-matrices of the Jacobian matrix

as shown below:

The dimension of the sub-matrix

Your answerChoose one option.

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Two generators have cost functions

and

. Their incremental-cost characteristics are

They need to deliver a combined load of 260 MW. Ignoring the network losses, for economic operation, the generations

and

(in MW) are

Your answerChoose one option.

P₁ = P₂ = 130

P₁ = 160, P₂ = 100

P₁ = 140, P₂ = 120

P₁ = 120, P₂ = 140

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For the closed-loop system shown, the transfer function

Your answerChoose one option.

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2021 · Paper 1