Electrical engineering, like any job in technology,contains a lot of technical questions.
Your safest bet to be successful at an electricalengineering interview is to brush up on your technical knowledge and review any of thelatest updates in the field.
You are going to be tested on what you can do, because yourjob is too important to be given to someone without the right technical knowledge.
In this video are some of the questions youmay be asked at a job interview, including a few technical questions to get you started.
Question 1.
Define the term Capacitance and Inductance? Capacitance: It is the amount of charge thatis stored inside a capacitor at a given voltage.
Inductance: It is defined as the propertyof a coil to resist any changes in electric current flowing through it.
Mutual inductancehappens when a secondary coil opposes current change in the primary coil.
Question 2.
What is a differential amplifier?Also, explain CMRR.
Differential Amplifier: The amplifier, whichis used to amplify the voltage difference between two input-lines neither of which isgrounded, is called differential amplifier.
This reduces the amount of noise injectedinto the amplifier, because any noise appearing simultaneously on both the input-terminalsas the amplifying circuitry rejects it being a common mode signal.
CMRR: It can be defined as the ratio of differential voltage-gain to common made voltage gain.
If a differential amplifier is perfect, CMRR would be infinite because in that case commonmode voltage gain would be zero.
Question 3.
Mention what is the differencebetween generator and alternator? Both generator and alternator work on thesame principle they convert mechanical energy into electrical energy.
Generator: It converts induced EMF (Electro Motive Force) into direct current, where itbased on stationary magnetic field and revolving conductor which rolls on the armatures withslip rings and brushes riding against each other.
Alternator: It has rotating magnetic and stationary armature for high voltage and stationary magneticfield and a rotating armature for low voltage.
Question 4.
What is the one main differencebetween UPS & inverter? Uninterrupted power supply is mainly use forshort time.
Means according to UPS VA it gives backup.
UPS is also two types: on line andoffline.
Online UPS having high volt and amp for long time backup with high DC voltage.
But UPS start with 2 volt DC with 7 amps.
But inverter is start with 2, 24, to 36 voltDc and 20 amp to 80 amp with long time backup.
Question 5.
What will happen when power factoris leading in distribution of power? If there is high power factor, i.
E.
if poweris close to one: 1.
Losses in form of heat will be reduced.
2.
Cable becomes less bulky and easy to carry, and very cheap to afford.
3.
It also reduces over heating of transformers.
6.
What is the significance of vector groupingin power Transformers? Every power transformer has a vector grouplisted by its manufacturer.
Fundamentally it tells you the information about how thewindings are connected ( delta or star) and the phase difference ta the current and voltage.
I.
E.
D Y N means Delta primary, W Y E secondary and the current is at 0 clock referred tothe voltage.
Question 7.
What is 2 phase motor?A two phase motor is a motor with the starting winding and the running winding have a phasesplit.
i.
E.
AC servo motor , where the auxiliarywinding and the control winding have a phase split of 90 degree.
Question 8.
What happens when two positively charged material is placed together?When two positively charged material place together it will repel.
Question 9.
Which type of AC motor is used in the fan ( ceiling fan, exhaust fan, pedestalfan, bracket fan etc) which are find in the houses?Its single phase induction motor which mostly squirrel cage rotor and this are capacitorstart and capacitor run.
Question 10.
Give two basic speed controlscheme of DC shunt motor? By using flux control method:In this method a rheostat is connected across the field winding to control the field current.
So by changing the current the flux produced by the field winding can be changed, and sincespeed is inversely proportional to flux speed can be controlled.
By armature control method:In this method a rheostat is connected across armature winding by varying the resistancethe value of resistive drop can be varied, and since speed is directly proportional tothe speed can be controlled.
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