BE8254 important questions Basic Electrical and Instrumentation Engineering

BE8254 important questions Basic Electrical and Instrumentation Engineering Regulation 2017 Anna University free download.

BEIE Basic Electrical and Instrumentation Engineering important questions is provided to download for free in pdf.

Subject Name	BASIC ELECTRICAL AND INSTRUMENTATION ENGINEERING
Subject Code	BE8254
Regulation	2017
File	PDF

Sample BE8254 important questions Basic Electrical and Instrumentation Engineering:

Define magnetic reluctance
The opposition offered by the magnetic circuit for the magnetic flux path is known as magnetic reluctance. It is analogous to electric resistance.

Mention some magnetic materials
Alnicos, chromium steels, copper–nickel alloy, nickel, cobalt, tungsten and aluminium. (BE8254 important questions Basic Electrical and Instrumentation Engineering)

Define statically induced emf.
The coil remains stationary with respect to flux, but the flux through it changes with time. The emf induced is known as statically induced emf.

What do you mean by step down transformer?
If the secondary voltage is greater than primary value, the transformer is called step down transformer. (BE8254 important questions Basic Electrical and Instrumentation Engineering)

What are the functions of no-load current in a transformer?
No-load current produces flux and supplies iron loss and copper loss on no-load.

What is the significance of back emf?
In motoring mode, armature induced emf is known as the back emf to stress the fact that it opposes armature emf. It plays the rule of a regulator.

Write the principle of operation of 3 phase induction motor.
Induction motor works on the principle of faraday’s laws of electromagnetic induction. It consists of stator and rotor windings. As these rotor windings or bars rotate within the magnetic field created by the stator magnetizing currents, voltages are induced in them. If the rotor were to stand still, then the induced voltages would be very similar to those induced in the stator windings. (BE8254 important questions Basic Electrical and Instrumentation Engineering)

What is synchronous speed?
The speed at which the stator field rotates is called synchronous speed and it depends upon the frequency of supply and number of poles for which the stator is wound.