Electrical Engineering Interview Questions
Table of Contents
- 1 Explain the difference between direct and alternating current
- 2 What Is Electric Traction
- 3 What does PU stands for and what is its significance in Electrical Engineering
- 4 What Is the working principle of Electric Motors
- 5 What are different types of cooling methods used in transformers
- 6 Why Capacitors work on AC only
- 7 What is One-line diagram and what is its significance
- 8 What do you mean by zone of protection in power systems
- 9 What is practical application of Pulse-operated meters
- 10 What do you mean by main and teasor transformer in T or Scott connection transformer
Explain the difference between direct and alternating current
Alternating Current (AC) is defined as the type of electrical current, in which the direction of the flow of electrons switches back and forth at regular intervals or cycles. Direct current (DC) is defined as the type of electrical current which flows consistently in one direction.
What Is Electric Traction
Electrical traction means the use of electric power for traction system such as railways, trams, and trolleys.
What does PU stands for and what is its significance in Electrical Engineering
PU stands for per unit and it is widely employed in the field of Power System Analysis. The per-unit system is actually the expression of system quantities as fractions of a defined base unit quantity. The PU system simplifies power system calculations, since the quantities expressed as per-unit do not change when they are referred from one side of a transformer to the other.
What Is the working principle of Electric Motors
A current carrying conductor placed in a magnetic field has turning or twisting movement that is known as torque.
What are different types of cooling methods used in transformers
- ONAN (oil natural,air natural)
- ONAF (oil natural,air forced)
- OFAF (oil forced,air forced)
- ODWF (oil direct,water forced)
- OFAN (oil forced,air forced)
Why Capacitors work on AC only
Capacitor provide infinite resistance to dc components and only allows the AC components to pass through.
What is One-line diagram and what is its significance
One-line also sometimes referred as single-line diagram is an important type of drawing used by electrical power engineers to convey information about power systems. Generally the electric power systems are three-phase systems in which each of the three phases is very similar and sometimes identical. Due to this reason we can show one of the three phases and thus the name one-line diagram emerges.
What do you mean by zone of protection in power systems
The range within which a power device can detect a fault is known as its zone of protection.
What is practical application of Pulse-operated meters
Pulse-operated meters can be employed for energy and demand measurements. In these meters, a pulse initiator is integrated into the meter, which opens and closes electrical contacts for generating a pulse after certain amount of energy or power is being measured.
What do you mean by main and teasor transformer in T or Scott connection transformer
The Scott transformer uses two single-phase transformers with taps called Scott taps at particular locations.
- The main transformer is the first transformer that has a 50% tap on the primary winding.
- The teaser transformer, has its primary winding tapped at √3/2 or 86.6%.