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ESE-2018 Electrical Engineering Quiz 7

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Question 1

An unloaded generator with a pre-fault voltage 1 pu has the following sequence impedance:
Z0=j0.15 pu, Z1=Z2=j0.25 pu.
The neutral is grounded with a reactance of 0.05 pu. The fault current in pu for a single-line to ground fault is

Question 2

Consider the following statements:
The suitable configuration of HVDC converter is decided on the requirements
1) of high pulse number
2) of converter transformer utilization factor should be near to unity.
Which of these statements is/are correct?

Question 3

Assertion (A): In HVDC systems, the voltage should be as high as possible and the rectifiercontrol angle should be as low as possible.
Reason (R): Control of dc voltage is exercised by the rectifier and inverter control angles and respectively.

Question 4

In a 3-phase, 5 kV, 5 MVA system, what is the base impedance?

Question 5

The incremental cost characteristics of two generators delivering a total load of 200 MW are as follows:

What should be the values of P1 and P2, for economic operation?

Question 6

Fault calculations using computer program are usually done by

Question 7

A fault occurring at the terminals of an unloaded synchronous generator operating at its rated voltage has resulted in the following values of currents and voltages:

Which one of the following faults has occurred?

Question 8

A zero-sequence network of a 3-phase transformer is given below. Z0 is the zero-sequence impedance of the transformer. What is the type of transformer connections?
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Jun 13ESE & GATE EE