
Per Unit System(13/09/2024)
Authored by Deepti Randive
Other
University
Used 3+ times

AI Actions
Add similar questions
Adjust reading levels
Convert to real-world scenario
Translate activity
More...
Content View
Student View
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
Access all questions and much more by creating a free account
Create resources
Host any resource
Get auto-graded reports

Continue with Google

Continue with Email

Continue with Microsoft
or continue with
%20(1).png)
Apple
Others
By signing up, you agree to our Terms of Service & Privacy Policy
Already have an account?