BEE Viva Questions Basic Electrical and Electronics Engineering

Basic Electrical and Electronics Engineering BEE Viva Questions
1. What are the types of transformers? Classify them construction-wise?
2. What is the voltage range of the regular ac supply v receive at home?
3. What is ripple factor? how will u eliminate d ac component?
4)what are the types of resistors?
5)what are the types of transistors?
6)definition of current, power, voltage, energy?
7)where is p-n-p transistor used and where is n-p-n transistor used?
8)can rectifiers work on AC or DC or both?
9)what are the types of motors?
10)why we have 240V, 50hz in india and 220V, 60hz in US?
11)what is mesh, what is loop
12)If we have full wave rectifier, then why do we use Bridge rectifier.
13)Trace the path of current in bridge rectifier.
14)What is the material used in LED. Symbol of LED.
15)What is a resistor?
16)What are types of network?
17)In polyphase, Star & Delta, why we use AC supply and not DC.
18)Define a Diode
19)What is Line and Phase Voltage?
20)Diode passes AC/DC ?
21)How to measure 20Vp-p on a CRO?
22)What is an open circuit transformer?
23)Explain the colour coding of resistors.
24)How to identify cathode and anode of a diode, if the silver band is absent?
25)What is charge?
26)What are the various types of Diodes and transistors?
27)At what voltage does a Computer work?
28)Diodes work on what AC or DC?
29)Can diodes work on dc too?-yes
30)What voltage is supplied to household appliances in india?-220v,50hz
31)If you are given 2 leds in series,then how will the resultant intensity of light be affected ?
32)First it will increase the resistance as it is connected in series,therefore the current will decrease and
33)intensity depends on current,thuse less current so less intensity.
and what happens in parellel ?-The intensity will remain same,as same voltage across each led
is equal and res. also the same so same current flows.
34)State superposition theorem.
35)I was given a circuit having two AC power sources connected to two seperate diodes individually and both these came together to connect to a common branch having a resistor. I was asked if it was possible to find out the current in the resistor by superposition.
A. yes, it will involve taking phasor addition of the currents due to the individual sources, which will be converted to half-rectified pulsating DC
36)I was given a particular RLC parallel circuit and told to derive resonance condition for THAT circuit.(consisted of three branches, one having only a resistor, other having a choke-coil and third having a capacitor in series with a resistor)
A. a totally messy form having no patter wt-so-ever.(the concerned look on the examiner's face made me believe my answer was right)
37) i was given a series AC circuit having two resistors and two inductors. i was told to derive resonance condition for that circuit.
A. do not stay under the assumption that it turns out to be L1=-L2....that is possible only if flux directions are opposite through the two coils, but since both were in the same circuit, in series, the flux will be the same through both. also since we can not have negative inductance as such, L1+L2=0 fails, thus the only possible condition is, that the inductances are purely resistive, or in short, the inductances are either not present, or negligible.
38)1)there are two types of transformers viz:-stup up and step down.....in step up transformer no of turns in secondary coil is more than in primary and in step down transformer the no of turns in secodary coil is less than that in primary coil.....
39)i think it is 230V,50Hz AC....
40)it is something linked with transistors.....presecnce of ac in dc is called ripple factor