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Per Unit System(13/09/2024)

Authored by Deepti Randive

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University

Used 3+ times

Per Unit System(13/09/2024)
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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A synchronous generator rated 11 KV,50 MVA has a per unit impedance of 0.2 per unit on its own base,then its impedance referred to 22KV,150 MVA would be

0.133 PU

0.1 PU

0.2 PU

0.15 PU

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A 33 KV,25 MVA Transformer has a per unit impedance of 0.9 per unit on its own base, then its impedance referred to 11KV,50 MVA would be

10.4

12.2

14.4

16.2

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The per unit impedance Zpu of 3-Phase system is

Z(ohm)*(MVAB)/(kV)2B

Z(ohm)*(kV)2B/(MVAB)

1000*(kV)B/√3.IB

1000*[(kV)B/IB]*106

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A synchronous generator is rated at 40 MVA,14.6 kV,50 Hz. The base impedance of generator will be

5.33 ohm

6.29 ohm

3.57 ohm

7.25 ohm

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A 50 MVA, 15 kV synchronous generator has a per unit impedance of 0.25 per unit on its own base. What would be its impedance referred to 30 kV, 100 MVA?

0.083 PU

0.125 PU

0.2 PU

0.167 PU

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The base impedance Zbase for a 3-phase transformer rated at 20 MVA and 11 kV is calculated as:

Z(ohm) = (kV)2/(MVA)

Z(ohm) = (MVA)/(kV)2

Z(ohm) = (kV)2/(3*MVA)

Z(ohm) = (3*MVA)/(kV)2

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A 25 MVA, 33 kV transformer has a per unit impedance of 0.12 per unit on its own base. If referred to 22 kV, what would be its impedance?

0.08

0.1

0.12

0.15

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