All questions of Network Basics & Basic Laws for Electrical Engineering (EE) Exam

Calculate the total current in the circuit.
a)20A
b)11.42A
c)12A
d)15A
Correct answer is option 'B'. Can you explain this answer?

Gargi Basak answered
The 1 ohm and 2-ohm resistor are in series which is in parallel to the 3-ohm resistor.
The equivalent of these resistances is in series with the 4 ohms and 5-ohm resistor.
Total R= 10.5 ohm. I=V/R= 120/10.5= 11.42A.

ib = ?
  • a)
    0.5 A
  • b)
    0.6 A
  • c)
    0.4 A
  • d)
    0.3 A
Correct answer is option 'B'. Can you explain this answer?

Yash Patel answered
Correct Answer :- B
Explanation : Current due to voltage source is:
I' = 10/(64+36) 
= 0.1A.
Current due to current source is:
I = 0.5A.
Current ib = I' + I 
= 0.5+ 0.1
= 0.6A

 
Voltage across the 60ohm resistor is______
  • a)
    72V
  • b)
    0V
  • c)
     48V
  • d)
     120V
Correct answer is option 'B'. Can you explain this answer?

Bhavana Reddy answered
The 60ohm resistance is shorted since current always choses the low resistance path. Voltage across short circuit is equal to zero, hence voltage across the resistor is 0.

Calculate the equivalent resistance between A and B.
  • a)
     60 ohm
  • b)
     15 ohm
  • c)
    12 ohm
  • d)
    48 ohm
Correct answer is option 'C'. Can you explain this answer?

The 5 ohm and 15 ohm resistances are connected in series and 10 ohm and 20 ohm resistors are also connected in series. Therefore,20 ohm and 30 ohm  are parallel with each other.

The total resistance between A and B are?
  • a)
    20 ohm
  • b)
    5 ohm
  • c)
    80 ohm
  • d)
    0 ohm
Correct answer is option 'B'. Can you explain this answer?

Ameya Gupta answered
The resistors are connected in parallel, hence the equivalent resistance= 1/(1/20=1/20+1/20+1/20)=5ohm.

Calculate the equivalent resistance between A and B.
  • a)
     2 ohm
  • b)
    4 ohm
  • c)
    6 ohm
  • d)
    8 ohm
Correct answer is option 'A'. Can you explain this answer?

 R=((2+3)||5)+1.5)||4.The 2 and the 3 ohm resistor are in series. The equiva-lent of these two resistors is in parallel with the 5 ohm resistor. The equivalent of these three resistances is in series with the 1.5 ohm resistor. Finally, the equivalent of these re-sistances is in parallel with the 4 ohm resistor.

Find the value of the currents I1 and I2.
  • a)
     0.3, 0.1
  • b)
     -0.1, -0.3
  • c)
     0.1, 0.2
  • d)
    -0.3, -0.1
Correct answer is option 'C'. Can you explain this answer?

Neha Nambiar answered
To explain: Using KVL in loop 1, 10-100 i1=0. i1=0.1A

Using KVL in outer loop, -100i2+20=0  i2=0.2A.

Correct Answer is d)  0.1, 0.2

 Calculate the current across the 20 ohm resistor.
  • a)
    20A
  • b)
    1A
  • c)
    0.67A
  • d)
    0.33A
Correct answer is option 'D'. Can you explain this answer?

Aashna Dey answered
Using current divider rule the current through the 20 ohm resistor= (total current in the circuit x resistance of the other branch)/total resistance= 1×10/30=3.33A.

KCL deals with the conservation of?
  • a)
    Mass
  • b)
    Momentum
  • c)
    Charge
  • d)
    Energy
Correct answer is option 'D'. Can you explain this answer?

Bijoy Kapoor answered
Kirchhoff’s Current Law
Kirchhoff’s Current Law (KCL) is Kirchhoff’s first law that deals with the conservation of charge entering and leaving a junction. To determine the amount or magnitude of the electrical current flowing around an electrical or electronic circuit, we need to use certain laws or rules that allows us to write down these currents in the form of an equation. The network equations used are those according to Kirchhoff’s laws, and as we are dealing with circuit currents, we will be looking at Kirchhoff’s current law, (KCL).

 KVL is applied in ____________
  • a)
    Mesh analysis
  • b)
    Nodal analysis
  • c)
    Both mesh and nodal
  • d)
    Neither mesh nor nodal
Correct answer is option 'A'. Can you explain this answer?

Explanation: 
Mesh analysis helps us to utilize the different voltages in the circuit as well as the IR products in the circuit which is nothing but KVL.
You can know more about Kirchhoff's Laws  through the document: 

i = ?
  • a)
    1 A
  • b)
    2 A
  • c)
    3 A
  • d)
    4 A
Correct answer is option 'A'. Can you explain this answer?

By kcl
points are mentioned in diagram
at Point D
the incoming currents are i and 5
outgoing current at point D is 6

i +5 = 6

I = 1 amps

Calculate the current A.
  • a)
     5A
  • b)
    10A
  • c)
    15A
  • d)
     20A
Correct answer is option 'C'. Can you explain this answer?

Anoushka Kumar answered
KCl states that the total current leaving the junction is equal to the current entering it. In this case, the current entering the junction is 5A+10A=15A.

KCL is associated with_________
  • a)
    Mesh analysis
  • b)
    Nodal analysis
  • c)
    Both mesh and nodal
  • d)
    Neither mesh nor nodal
Correct answer is option 'B'. Can you explain this answer?

Mrinalini Sen answered
Potassium chloride (KCl) is a metal halide salt composed of potassium and chlorine. It is odorless and has a white or colorless vitreous crystal appearance. The solid dissolves readily in water and its solutions have a salt-like taste.

Calculate the current across the 20 ohm resistor.
  • a)
    10A
  • b)
     20A
  • c)
     36.67A
  • d)
     6.67A
Correct answer is option 'A'. Can you explain this answer?

Sharmila Bajaj answered
Explanation: I=V/R. Since in parallel circuit, voltage is same across all resistors. Hence across the 20 ohm resistor, V=200V so I=200/20=10A.

The voltage across the short is?
  • a)
    135V
  • b)
    Infinity
  • c)
     Zero
  • d)
    11.25V
Correct answer is option 'C'. Can you explain this answer?

Sanvi Kapoor answered
The voltage across a short is always equal to zero whether it is connected in seroes or parallel.

Calculate the resistance between A and B.
  • a)
    3.56 ohm
  • b)
    7 ohm
  • c)
    14.26 ohm
  • d)
    29.69 ohm
Correct answer is option 'A'. Can you explain this answer?

Lavanya Menon answered
  • The 1 ohm, 2 ohm and 3 ohm resistors are connected in parallel. Its equivalent resistance is in series with the 4 ohm resistor and the parallel connection of the 5 ohm and 6 ohm resistor.
  • The equivalent resistance of this combination is 80/11 ohm. This is in parallel with 7 ohm to give equivalent resistance between A and B is 3.56 ohm.

Batteries are generally connected in______
  • a)
    Series
  • b)
    Parallel
  • c)
    Either series or parallel
  • d)
    Neither series nor parallel
Correct answer is option 'A'. Can you explain this answer?

Sakshi Roy answered
Batteries are generally connected in series so that we can obtain the desired voltage since voltages add up once they are connected in series.

v1 = ?
  • a)
    -11 V
  • b)
    5 V
  • c)
    8 V
  • d)
    18 V
Correct answer is option 'C'. Can you explain this answer?

Ashwin Kapoor answered
If we go from +side of 1 kΩ through 7 V, 6 V and 5V, we get v1 = 0 +  7 + 6 - 5 = 8 V

Find the value of v if v1=20V.
  • a)
    10V
  • b)
     12V
  • c)
    14V
  • d)
    16V
Correct answer is option 'B'. Can you explain this answer?

The current through the 10 ohm resistor = v1 / 10 = 2A
Applying KCL at node 1: i5 = i10 + i2
i= 6 - 2 = 4A
Thus the drop in the 2 ohm resistor = 4×2 = 8V
v1 = 20V; hence v2 = 20-v across 2 ohm resistor = 20 - 8 = 12V
v2 = v since they are connected in parallel.
v = 12V

A solid copper sphere, 10 cm in diameter is deprived of 1020 electrons by a charging scheme. The charge on the sphere is
  • a)
    160.2 C
  • b)
    -160.2 C
  • c)
    -16.02 C
  • d)
    16.02 C 
Correct answer is option 'C'. Can you explain this answer?

Amar Sengupta answered
Let's calculate the charge on the sphere
Understanding the problem:
  • A copper sphere loses 10^20 electrons.
  • We need to find the total charge on the sphere.
Solution:
  • Charge of one electron (e) = -1.6 x 10^-19 C
  • Number of electrons removed (n) = 10^20
Total charge (Q) = n * e
Q = 1020 * (-1.6 x 10^-19 C) Q = -1.632 x 10^-16 C
Approximately, Q = -16.02 x 10^-17 C
Therefore, the charge on the sphere is -16.02 C.
So, the correct answer is:
4. -16.02 C
Note that the charge is negative because electrons are removed, leaving a net positive charge on the sphere.
​​​​

i1 = ?
  • a)
    3.3 A
  • b)
    2.1 A
  • c)
    1.7 A
  • d)
    1.1 A
Correct answer is option 'A'. Can you explain this answer?

Using superposition theorem
first open the 6A current source, find the i1=3.5
second short circuit the voltage source current i1= -0.2 (here minus represent the reverse direction of i1)

the total current is sum of two
I = i1 + i2
= 3.5 + (-0.2)
= 3.3

What is the current through R1 and R2 in the following diagram?
Circuit1.JPG
  • a)
    I1 =1.875 I2 = 3.125.
  • b)
    {\displaystyle I_{1}=1A}{\displaystyle I_{2}=25A}.
  • c)
    {\displaystyle I_{1}=0.1A}{\displaystyle I_{2}=0.1667A}
  • d)
    {\displaystyle I_{1}=10A} , {\displaystyle I_{2}=16.67A}.
Correct answer is option 'A'. Can you explain this answer?

Saumya Sen answered
  • All are In parallel so voltage is same
  • I=  ( R2/R1+R2 )V = ( 3/8 )x5A = 1.875
  • I2 = ( R
    1
    /R1+R2 )V = ( 5/8 )x5A = 3.125

KCL is applied at _________
  • a)
    Loop
  • b)
    Node
  • c)
    Both loop and node
  • d)
    Neither loop nor node
Correct answer is option 'B'. Can you explain this answer?

KCL states that the amount of charge leaving a node is equal to the amount of charge entering it, hence it is applied at nodes.

The symbol shown here is:
  • a)
    Voltage controlled current source
  • b)
    Current controlled current source
  • c)
    Current controlled voltage source
  • d)
    Voltage controlled voltage source
Correct answer is option 'A'. Can you explain this answer?

Concept:
Independent sources:
An independent voltage source maintains a voltage (fixed or varying with time) which is not affected by any other quantity. Similarly, an independent current source maintains a current (fixed or time-varying) which is unaffected by any other quantity.
Dependent sources:
  • Some voltage (current) sources have their voltage (current) values varying with some other variables.
  • They are called dependent (voltage or current) sources or controlled (voltage or current) sources.
  • It is represented in diamond symbol.
  • Since the control of the dependent source is achieved by a voltage or current of some other element in the circuit, and the source can be voltage or current. 
  • It follows that there are four possible types of dependent sources, namely:
  1. Voltage-controlled voltage source (VCVS)
  2. Current-controlled voltage source (CCVS)
  3. Current-controlled current source (CCCS)
  4. Voltage-controlled current source (VCCS)
Application:
1.  
In the given circuit, the dependent source is a current source (gvc) which depends on the voltage in the other branch. Hence dependent source in the circuit is a voltage-controlled current source.
2. 
In the given circuit, the dependent source is a current source (dic) which depends on the current in the other branch. Hence dependent source in the circuit is a current-controlled current source.
3. 
In the given circuit, the dependent source is a voltage source (bvc) which depends on the voltage in the other branch. Hence dependent source in the circuit is a voltage-controlled voltage source.
4. 
In the given circuit, the dependent source is a voltage source (ric) which depends on the current in the other branch. Hence dependent source in the circuit is a current-controlled voltage source.

Find the value of the node voltage V. ​
  • a)
    60V
  • b)
    50V
  • c)
    40V
  • d)
    30V
Correct answer is option 'A'. Can you explain this answer?

Ashwin Kapoor answered
The node equation is:
-2+8+V/10=0 => 6 + v/10 = 0 => v = 10*6=>60v
Solving this equation, we get V=60V.

If there are 10 nodes in a circuit, how many equations do we get?
  • a)
    10
  • b)
    9
  • c)
    8
  • d)
    7
Correct answer is option 'B'. Can you explain this answer?

Bharathi Donku answered
In the circuit 10 nodes is there, we get 9 equations only we get. because 1 node is treated as reference node.

Mesh analysis is generally used to determine _________
  • a)
    Voltage
  • b)
    Current
  • c)
    Resistance
  • d)
    Power
Correct answer is option 'B'. Can you explain this answer?

Shivam Ghosh answered
Mesh analysis uses Kirchhoff’s Voltage Law to find all the mesh currents. Hence it is a method used to determine current.

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