Consider the following statements regarding the fault analysis
1. The neutral grounding impedance Zn appears as 3Zn in zero sequence equivalent circuit
2. For faults on transmission lines, 3-phase fault is the least severe among other faults
3. The positive and negative sequence networks are not affected by method of neutral grounding
Which of the statements given above are correct ?

If a sudden short circuit occurs on a power system (considered as R-L series circuit), the current wave-form consists of
1. Decaying AC current
2. Decaying DC current
Let the alternator reactance be X and the power system resistance R. Which one of the following is correct ?

Possible faults that may occur on a transmission line are
1. 3-phase fault
2. L-L-G fault
3. L-L fault
4. L-G fault
The decreasing order of severity of the fault from the stability point of view is

Transients in electric circuits normally disappears within a time equal to

A short circuit occurs in a transmission line (neglect line capacitance) when the voltage wave is going through zero, the maximum possible momentary short circuit current corresponding to

Which of the following is correct

The pu synchronous reactance X (at rated MVA) of a turbo alternator comes in the range of

Three phase short circuit MVA to be interrupted by a circuit breaker in a power system is given by

Fault level means

Fault calculation using computer are usually done by