Free Printable LPU_EE12

1.

Which of the following circuits represent a single line-to-ground fault?

a)

b)

c)

2.

Which of the following circuits represent a line-to-line fault?

a)

b)

c)

3.

Which of the following circuits represent a double line-to-ground fault?

a)

b)

c)

4.

At a certain location of an electrical system, the available short circuit MVA is 10 at 110 kV while its Thevenin's equivalent reactance is 0.05 pu. Determine the per unit reactance of this point using a base 20 MVA and 115kV?

a)

0.09

b)

0.08

c)

0.07

d)

0.06

5.

At a certain location of an electrical system, the available short circuit MVA is 15 at 120 kV while its Thevenin's equivalent reactance is 0.05 pu. Determine the per unit reactance of this point using a base 25 MVA and 135kV?

a)

0.09

b)

0.08

c)

0.07

d)

0.06

6.

In a medium transmission line, which of the following is true about its ABCD constants?

a)

AD-BC=0

b)

AD-BC=1

c)

AC-BD=0

d)

AC-BD=1

7.

A 150-km, 3-phase, 50-Hz transmission line transmits a load of 40,000-kW at 0.8 lagging at receiving end. It has the following parameters; R=22.5-Ω, X_L=90-Ω, Y=0.015 S
Using the T model, determine its C constant

a)

0.325+0.16875i

b)

7.3125+61.5234375i

c)

0.015i

8.

A 150-km, 3-phase, 50-Hz transmission line transmits a load of 40,000-kW at 0.8 lagging at receiving end. It has the following parameters; R=22.5-Ω, X_L=90-Ω, Y=0.015 S
Using the T model, determine its B constant

a)

0.325+0.16875i

b)

7.3125+61.5234375i

c)

0.015i

9.

A 150-km, 3-phase, 50-Hz transmission line transmits a load of 40,000-kW at 0.8 lagging at receiving end. It has the following parameters; R=22.5-Ω, X_L=90-Ω, Y=0.015 S
Using the T model, determine its A constant

a)

0.325+0.16875i

b)

7.3125+61.5234375i

c)

0.015i

10.

A 150-km, 3-phase, 50-Hz transmission line transmits a load of 40,000-kW at 0.8 lagging at receiving end. It has the following parameters; R=22.5-Ω, X_L=90-Ω, Y=0.015 S
Using the pi model, determine its A constant

a)

0.325+0.16875i

b)

22.5+90i

c)

-0.00126563+0.0099375i

11.

A 150-km, 3-phase, 50-Hz transmission line transmits a load of 40,000-kW at 0.8 lagging at receiving end. It has the following parameters; R=22.5-Ω, X_L=90-Ω, Y=0.015 S
Using the pi model, determine its B constant

a)

0.325+0.16875i

b)

22.5+90i

c)

-0.00126563+0.0099375i

12.

A 150-km, 3-phase, 50-Hz transmission line transmits a load of 40,000-kW at 0.8 lagging at receiving end. It has the following parameters; R=22.5-Ω, X_L=90-Ω, Y=0.015 S
Using the pi model, determine its C constant

a)

0.325+0.16875i

b)

22.5+90i

c)

-0.00126563+0.0099375i

13.

For the nominal T representation of a medium transmission line, which of the following is the formula for its A constant?

a)

$\left(1+\frac{ZY}{2}\right)$

b)

$Z\left(1+\frac{ZY}{4}\right)$

c)

$Y$

d)

$\left(1+\frac{ZY}{4}\right)$

14.

For the nominal T representation of a medium transmission line, which of the following is the formula for its B constant?

a)

$\left(1+\frac{ZY}{2}\right)$

b)

$Z\left(1+\frac{ZY}{4}\right)$

c)

$Y$

d)

$\left(1+\frac{ZY}{4}\right)$

15.

For the nominal T representation of a medium transmission line, which of the following is the formula for its C constant?

a)

$\left(1+\frac{ZY}{2}\right)$

b)

$Z\left(1+\frac{ZY}{4}\right)$

c)

$Y$

d)

$\left(1+\frac{ZY}{4}\right)$

16.

For the nominal Pi representation of a medium transmission line, which of the following is the formula for its C constant?

a)

$\left(1+\frac{ZY}{2}\right)$

b)

$Z\left(1+\frac{ZY}{4}\right)$

c)

$Z$

d)

$Y\left(1+\frac{ZY}{4}\right)$

17.

For the nominal Pi representation of a medium transmission line, which of the following is the formula for its B constant?

a)

$\left(1+\frac{ZY}{2}\right)$

b)

$Z\left(1+\frac{ZY}{4}\right)$

c)

$Z$

d)

$Y\left(1+\frac{ZY}{4}\right)$

18.

For the nominal Pi representation of a medium transmission line, which of the following is the formula for its A constant?

a)

$\left(1+\frac{ZY}{2}\right)$

b)

$Z\left(1+\frac{ZY}{4}\right)$

c)

$Z$

d)

$Y\left(1+\frac{ZY}{4}\right)$

19.

three phase unbalanced currents are:
$I_a=10\angle-30\degree$ , $I_b=0$ and $I_c=10\angle150\degree$

determine the zero sequence component of Ia

a)

0

b)

$3.33\angle30\degree$

c)

$5.77$

d)

3.33

20.

three phase unbalanced currents are:
$I_a=10\angle-30\degree$ , $I_b=0$ and $I_c=10\angle150\degree$

determine the positive sequence component of Ia

a)

0

b)

$3.33\angle30\degree$

c)

$5.77$

d)

3.33

LPU_EE12_FINALS

Total questions: 20

Worksheet time: 40mins

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