SSC JE EE Score Booster Quiz 1 (Power System)

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Question 1

Which fault is more severe ______

• A3-phase symmetrical fault
• Bsingle to ground fault
• CLLG fault
• DDouble line fault

Question 2

The short-circuit kVA is maximum when fault occurs

• Anear the generator
• Bat the end of transmission line
• Cin the middle of transmission line
• Dnone of the above

Question 3

A symmetrical fault occurs on a power system. The percentage reactance of the system on 2500 base kVA is 25%. If the full-load current corresponding to base kVA is 20A, then short-circuit current is

• A80 A
• B40 A
• C160 A
• D20 A

Question 4

When a line-to-ground fault occurs, the current in the faulted phase is 100 A. The zero-sequence current this case is

• A33.3 A
• Bzero
• C66.6 A
• D100 A

Question 5

The currents in a 3-phase unbalanced system are:

The phase sequence is RYB. The zero phase sequence component in R-phase is

• A(1+j1.33)A
• B(2+j1.33)A
• C(3+j1.33)A
• D(4+j1.33)A

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