Electrical Interview_Question Answer_Network Analysis_DAY-1_GATE/ESE/RRB/SSC/MPEB PREPARATION_ Detailed Explanation

1. GATE/IES/SSC/RRB/
UPPCL/MPEB परीक्षा
तथा TECHNICAL
INTERVIEW की
तैयारी
NETWORLK
ANALYSIS/CIRCUIT
THEORY
DAY-1
WITH DETAILED
EXPLANTION

2. Q. What is resistance?
Ans.The resistance is the property of a material to
oppose the flow of current in a material. Its unit is
ohm.
Q. What are the material used for resistor?
Ans. The material used are maganin (alloy of copper
magnese and nickel),constantan(alloy of nickel and
copper).
Q. What are the properties of a resistor?
Ans. The properties are high resistivity ,resistance
to oxidation, corrosion and moisture.

3. Q. what is inductance?
Ans. It is the property of a material by virtue of
which it opposes any change of magnitude and
direction of current passing through the conductor
Q. What happens to voltage when current through
the inductor is constant?
Ans. The voltage across inductor is zero.
in an element.
Q. Capacitor is linear or non linear element?
Ans. Linear Element.

4. Q. How will you define capacitance?
Ans. It is the ability to store electric charge within
it.Capacitance is a measure of charge per unit
voltage that can be stored.{C=Q/V}
Q. What is the unit of charge and current?
Ans. The units are coulomb(C)and ampere (A).
Q. What are the material used for inductance coil?
Ans. The materials used are conducting wire, wrapped
around a core either plastic(air) or ferromagnetic (iron
core.)

5. Q. Which capacitor is preferred for high voltage and
frequency?
Ans. The vacuum and gas filled capacitor are used
for high voltage and frequency applications.
Q. State Kirchhoff's current law?
Ans. The algebraic sum of currents at any node of
a circuit is zero. The sum of incoming current is
equal to sum of outgoing current.
Q. State Kirchhoff’s voltage law?
Ans. Kirchhoff’s voltage law states that the algebraic sum
of all branch voltages around any closed loop of a network
is zero at all instant of time.

6. Q.What is the limitation of Kirchhoff's law?
Ans. It fails in distributed parameter network.
.Q. List examples of current sources?
Ans. Semiconductor devices like transistor and diode are
treated as current sources.
Q. List examples of voltage source?
Ans. The examples of voltage source are battery and generator.
Q. What are dependent sources?
Ans. When strength of voltage or current changes in the
source for any change in the connected network they are
called dependent sources..

7. Q. what do you mean by a electrical power?
Ans. The rate at which work is being done ia an electrical
circuit is called electrical power.
Q.Define current?
Ans. The rate of change of charge with respect to time is
called electric current.
Q. State Thevenin,s Theorem?
Ans. This theorem states that any linear network with
output terminal AB can be replaced by a single voltage
source V in series with a single impedance.
Q. How equivalent impedance is calculated in
TheveninTheorem?
Ans. All independent voltage sources are short circuited
and all independent current sources are open circuited.

8. Ans:Statements:-“Any two-terminal linear electric circuit consisting
of resistors and sources can be replaced by an equivalent circuit
containing a single voltage source in series with a resistor connected
across the load.”
Steps/procedure to simplify where VTH and RTH are the Thevenin’s
voltage and Thevenin’sresistance respectively.
1. Remove the load resistance RL.
2. VTH is the open circuit (OC) voltage across
the load terminals
3. RTH is the resistance across the load terminals
with all sources replaced by their internal resistances.

9. Q. Define branch?
Ans. It is a part of a network which lies between two
junction points.
Q. Define active and passive network?
Ans. The network which has no current or voltage source is
called passive network. The network which either has
current or voltage source is called active network.
Q. State Ohm’s Law?
Ans. The current through any conductor is directly
proportional to the applied potential difference across it
keeping physical condition unchanged.
Q. what are limitations of Ohms law?
Ans. The main limitation of Ohm’s law is that physical
dimension of the conductor should not change with
temperature.

10. Kirchhoff's Voltage Law
The algebraic sum of voltages around
each loop is zero.
Σ voltage drops - Σ voltage rises = 0
Or
Σ voltage drops
=
Σ voltage rises
Kirchhoff's Current Law
 The sum of currents entering any
point in a circuit is equal to the sum
of currents leaving that point.
 Kirchhoff’s Current Law may also be
stated as
IIN = IOUT