Powergrid interview questions

Hello sir I am qualified in the interview round of PGCIL so please provide me some basic questions which asked in this interview.

[Pathak]

POWER GRID CORPORATION OF INDIA LIMITED (POWERGRID) is the Central Transmission Utility (CTU) of the country under Ministry of Power

Details of types of questions asked in each of the sections:

Questions were based on transmission line, Automatic Generation Control, PSOC etc like:

1. Representations of Long line,short line & medium lines.

2. Automatic Generation Control.

3. Industrial training based questions.

4. Transmission line X/R ratio and why it should be more or less.

5. Generator steam control and Automatic Voltage Regulators and their practical applications.

Personal Interview (Technical)

What is the voice of ratio?

What is the ingredient value of 40mm and 20mm aggregates?

Is it really necessary to have reactive power in transmission line to transfer the power from one place to other?

Why ct secondary is not kept open while primary charged. Answer in terms of ct parameters.

What are all the conditions to protect generator & turbine in thermal power plant?

How tto ingress mw in turbine explain.procedure?

Why can we use cosine wave instead of sine in ac supply as both have same RMS vale and ripple factor any earth foult trip the relay but in
Welding time not trip by earth foult

Which motor is used in our Indian Ceiling fan -Capacitor start and run or Capacitor start? (during repair i saw only one capacitor so it should be start only)

In Megger which types of test we can do ? And How it works? How to use?

What device is use for metering current at lt consumer end..??

According to faraday's law whether the induced emf is average or rms value?

How to differentiate 220 Kv & 132 Kv line transmission tower if there are no specifications given on towers?

When generator short circuit condition, the current how dissipates. Or at short circuit voltage not available then current how can flow?

What is the physical phenomenon because of which skin effect occurs ??