GATE EE 2011 | GATE EE Year Wise Previous Years Questions

GATE EE 2011

MCQ (Single Correct Answer)

-0.6

A load center of 120 MW derives power from two power stations connected by 220 kV transmission lines of 25 km and 75 km as shown in the figure below. The three generators G1,G2 and G3 are of 100 MW capacity each and have identical fuel cost characteristics. The minimum loss generation schedule for supplying the 120 MW load is GATE EE 2011 Power System Analysis - Power Generation Cost Question 8 English

GATE EE 2011 Power System Analysis - Power Generation Cost Question 8 English

$$P1 = 80\,MW + $$ losses
$$P2 = 20\,MW$$
$$P3 = 20\,MW + $$ losses

$$P1 = 60\,MW $$
$$P2 = 30\,MW$$ $$+$$ losses
$$P3 = 30\,MW $$

$$P1 = 40\,MW $$
$$P2 = 40\,MW$$
$$P3 = 40\,MW + $$ losses

$$P1 = 30\,MW + $$ losses
$$P2 = 45\,MW$$
$$P3 = 45\,MW $$

GATE EE 2011

MCQ (Single Correct Answer)

-0.3

A negative sequence relay is commonly used to protect

An alternator

A transformer

A transmission line

A bus bar

GATE EE 2011

MCQ (Single Correct Answer)

-0.6

A three–bus network is shown in the figure below indicating the p.u. impedances of each element GATE EE 2011 Power System Analysis - Load Flow Studies Question 10 English

GATE EE 2011 Power System Analysis - Load Flow Studies Question 10 English

The bus admittance matrix, $$Y$$-$$bus,$$ of the network is

$$j\left[ {\matrix{ {0.3} & { - 0.2} & 0 \cr { - 0.2} & {0.12} & {0.08} \cr 0 & {0.08} & {0.02} \cr } } \right]$$

$$j\left[ {\matrix{ { - 15} & 5 & 0 \cr 5 & {7.5} & { - 12.5} \cr 0 & { - 12.5} & {2.5} \cr } } \right]$$

$$j\left[ {\matrix{ {0.1} & {0.2} & 0 \cr {0.2} & {0.12} & { - 0.08} \cr 0 & { - 0.08} & {0.10} \cr } } \right]$$

$$j\left[ {\matrix{ { - 10} & 5 & 0 \cr 5 & {7.5} & {12.5} \cr 0 & {12.5} & { - 10} \cr } } \right]$$

GATE EE 2011

MCQ (Single Correct Answer)

-0.6

Two generator units $$G1$$ and $$G2$$ are connected by $$15$$ $$kV$$ line with a bus at the mid-point as shown below GATE EE 2011 Power System Analysis - Per Unit System Question 1 English

GATE EE 2011 Power System Analysis - Per Unit System Question 1 English

$${G_1} = 250\,\,MVA.\,\,\,15kV,\,\,$$ positive sequence $$X = 25$$% on its own base
$${G_2} = 100\,\,MVA.\,\,\,15kV,\,$$ positive sequence $$X = 10$$% on its own base
$${L_1}$$ and $${L_2}$$ $$= 10$$ $$km,$$ positive sequence $$ X = 0.225$$ $$\,\,\Omega /km$$

In the above system the three-phase fault $$MVA$$ at the bus $$3$$ is

$$82.55$$ $$MVA$$

$$85.11$$ $$MVA$$

$$170.91$$ $$MVA$$

$$181.82$$ $$MVA$$

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