1

GATE EE 2018

MCQ (Single Correct Answer)

+2

-0.67

The per-unit power output of a salient-pole generator which is connected to an infinite bus,
is given by the expression, P = 1.4 sin $$\delta $$ + 0.15 sin 2$$\delta $$, where $$\delta $$ is the load angle. Newton-Raphson method is used to calculate the value of $$\delta $$ for P = 0.8 pu. If the initial guess is
$$30^\circ $$, then its value (in degree) at the end of the first iteration is

2

GATE EE 2017 Set 1

MCQ (Single Correct Answer)

+2

-0.6

The bus admittance matrix for a power system network is
$$$\left[ {\matrix{
{ - j39.9} & {j20} & {j20} \cr
{j20} & { - j39.9} & {j20} \cr
{j20} & {j20} & { - j39.9} \cr
} } \right]\,pu.$$$

There is a transmission line connected between buses $$1$$ and $$3,$$ which is represented by the circuit shown in figure.

There is a transmission line connected between buses $$1$$ and $$3,$$ which is represented by the circuit shown in figure.

If this transmission line is removed from service what is the modified bus admittance matrix?

3

GATE EE 2015 Set 1

MCQ (Single Correct Answer)

+2

-0.6

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.4

GATE EE 2013

MCQ (Single Correct Answer)

+2

-0.6

For a power system network with $$n$$ nodes, $${Z_{33}}$$ of its bus impedance matrix is $$j0.5$$ per unit. The voltage at mode $$3$$ is $$1.3\angle - {10^0}\,\,$$ per unit. If a capacitor having reactance of $$-j3.5$$ per unit is now added to the network between node $$3$$ and the reference node, the current drawn by the capacitor per unit as

Questions Asked from Load Flow Studies (Marks 2)

Number in Brackets after Paper Indicates No. of Questions

GATE EE Subjects

Electric Circuits

Electromagnetic Fields

Signals and Systems

Electrical Machines

Engineering Mathematics

General Aptitude

Power System Analysis

Electrical and Electronics Measurement

Analog Electronics

Control Systems

Power Electronics