Electrical Engineering Interview Questions-Part5

How VFD (variable frequency) drive is used as an energy saver....?

What is effect of unbalanced load -- say R 15A, Y 25A, B?

If i want to build 230kv substation what are the equipment’s to be installed?

How power saving takes place through VFD?

How to write program by ladder logic in case of PLC operation?

What is surge suppressor?


How to find transformer is in normal position? Whether it’s in charged condition or not? Except humming sound?

How to find motor contactor rating and bimetallic relay rating? Of 30kw motor which will operate on star-delta starter?

How to calculate the capacitor range for load for pf improvement? Example for 65 hp loads how to calculate capacitor range?

As all us know that the capacitor panel is connected to improve the power factor when it is PF is low. Whether we can connect the capacitor panel on D.G. side? If it is yes why?

Why voltage drop will occur in 3 phase line?

How a generator is positioned in a hydroelectric power plant?

What is the generating voltage of a power station consided generally?

How to control the generator output voltage? What r the condition should satisfy for synchronization?

What is inrush current in transformer?

Why making capacity is more than breaking capacity?

What is cathodic protection in Tank, and product pipelines?

Can you give main difference between ELCB and RCCB?

What is GD2 (kg-m2) for Sq. Cage ind. Motor?

What is the difference between earthed and unearthed cable?

What are the difference between C-Curve and D-Curve for MCB’s?

How to select a CT?

How to select a circuit breaker?