Two resistors $R_1$ and $R_2$ are connected in parallel. What is the equivalent resistance $R_{eq}$?

$R_{eq} = \frac{R_1 R_2}{R_1 + R_2}$

$R_{eq} = \frac{R_1 + R_2}{R_1 R_2}$

According to the **Voltage Division Rule**, the voltage drop $V_1$ across a resistor $R_1$ in a series circuit with $R_1$, $R_2$, and a total voltage source $V$ is:

$V_1 = V \cdot \frac{R_1}{R_1 + R_2}$

$V_1 = V \cdot \frac{R_2}{R_1 + R_2}$

$V_1 = V \cdot \frac{R_1}{R_2}$

$V_1 = V \cdot \frac{R_1 + R_2}{R_1}$

Using the **Current Division Rule** for two parallel resistors $R_1$ and $R_2$ with a total entering current $I$, the current $I_1$ flowing through $R_1$ is:

$I_1 = I \cdot \frac{R_2}{R_1 + R_2}$

$I_1 = I \cdot \frac{R_1}{R_1 + R_2}$

$I_1 = I \cdot \frac{R_1 R_2}{R_1 + R_2}$

$I_1 = I \cdot \frac{R_1 + R_2}{R_2}$

ECE131 Unit 1: Fundamentals of D.C. Circuits - MCQ Practice | B. Tech. CSE

1 $Which of the following expressions correctly represents the relationship between current (), charge (), and time ()?$

A.

B.

C.

D.

2 $The energy stored in an inductor of inductance carrying a current is given by:$

A.

B.

C.

D.

3 $Which of the following statements regarding Ohm's Law is false ?$

A.

It is applicable to linear bilateral elements.

B.

It is applicable to non-linear devices like diodes and Zener diodes.

C.

It states that potential difference is directly proportional to current, provided temperature remains constant.

D.

The ratio represents resistance.

4 $Kirchhoff’s Current Law (KCL) is a consequence of the law of conservation of:$

A.

Energy

B.

Flux

C.

Momentum

D.

Charge

5 $Kirchhoff’s Voltage Law (KVL) states that the algebraic sum of voltages around a closed path is zero. This is based on the conservation of:$

A.

Current

B.

Energy

C.

Charge

D.

Power

6 $Two resistors and are connected in parallel. What is the equivalent resistance ?$

A.

B.

C.

D.

7 $According to the Voltage Division Rule, the voltage drop across a resistor in a series circuit with,, and a total voltage source is:$

A.

B.

C.

D.

8 $Using the Current Division Rule for two parallel resistors and with a total entering current, the current flowing through is:$

A.

B.

C.

D.

9 $What is the internal resistance of an ideal voltage source ?$

A.

Dependent on the load

B.

Very high

C.

Zero

D.

Infinite

10 $What is the internal resistance of an ideal current source ?$

A.

Infinite

B.

Negative

C.

1 Ohm

D.

Zero

11 $In a Star (Y) to Delta () transformation, if are the star-connected resistors connected to a neutral point, the equivalent Delta resistor between terminals A and B is:$

A.

B.

C.

D.

12 $Three equal resistors of value are connected in a Delta () configuration. What is the value of each resistor in the equivalent Star (Y) configuration?$

A.

B.

C.

D.

13 $Mesh analysis is primarily based on the application of:$

A.

Kirchhoff’s Voltage Law (KVL)

B.

Kirchhoff’s Current Law (KCL)

C.

Current Division Rule

D.

Maximum Power Transfer Theorem

14 $Nodal analysis is primarily based on the application of:$

A.

Kirchhoff’s Current Law (KCL)

B.

Voltage Division Rule

C.

Superposition Theorem

D.

Kirchhoff’s Voltage Law (KVL)

15 $A dependent source represented by a diamond shape with a +/- sign inside, controlled by a current elsewhere in the circuit, is known as a:$

A.

Voltage Controlled Voltage Source (VCVS)

B.

Voltage Controlled Current Source (VCCS)

C.

Current Controlled Voltage Source (CCVS)

D.

Current Controlled Current Source (CCCS)

16 $The Superposition Theorem is valid only for:$

A.

Linear networks

B.

Unilateral networks

C.

Networks with only one source

D.

Non-linear networks

17 $When applying the Superposition Theorem, how should ideal voltage sources be treated when they are 'turned off'?$

A.

Short circuited

B.

Open circuited

C.

Replaced by their internal resistance (infinity)

D.

Left as is

18 $When applying the Superposition Theorem, how should ideal current sources be treated when they are 'turned off'?$

A.

Open circuited

B.

Replaced by a wire

C.

Short circuited

D.

Grounded

19 $Thevenin’s Theorem states that any linear two-terminal circuit can be replaced by:$

A.

A single voltage source in parallel with a resistor

B.

A single current source in parallel with a resistor

C.

A single current source in series with a resistor

D.

A single voltage source in series with a resistor

20 $Norton’s Theorem states that any linear two-terminal circuit can be replaced by:$

A.

A single voltage source in parallel with a resistor

B.

A single current source in series with a resistor

C.

A single current source in parallel with a resistor

D.

A single voltage source in series with a resistor

21 $How are Thevenin resistance () and Norton resistance () related for the same network terminals?$

A.

B.

C.

D.

22 $To calculate the Thevenin voltage () across terminals A and B, you must find:$

A.

The short-circuit current between A and B

B.

The resistance between A and B with sources active

C.

The power dissipated between A and B

D.

The open-circuit voltage across A and B

23 $To calculate the Norton current () between terminals A and B, you must find:$

A.

The voltage when A and B are shorted

B.

The open-circuit voltage across A and B

C.

The current flowing when A and B are open

D.

The short-circuit current flowing between A and B

24 $The Maximum Power Transfer Theorem states that maximum power is transferred to the load resistance from a source with internal resistance when:$

A.

B.

C.

D.

25 $What is the efficiency of power transfer at the condition of Maximum Power Transfer?$

A.

100%

B.

75%

C.

50%

D.

25%

26 $If a Thevenin equivalent circuit has and, what is the value of the maximum power that can be delivered to a load?$

A.

5 W

B.

20 W

C.

50 W

D.

10 W

27 $What is the SI unit of conductance?$

A.

Volt (V)

B.

Ohm ()

C.

Henry (H)

D.

Siemens (S)

28 $Power consumed by a resistor is given by which of the following formulas?$

A.

B.

C.

All of the above

D.

29 $In a series circuit containing,, and, what is the total resistance?$

A.

B.

C.

D.

30 $If a 10V source is connected across two resistors in parallel, what is the total current drawn from the source?$

A.

4 A

B.

0.5 A

C.

1 A

D.

2 A

31 $Which of the following is considered a 'bilateral' element?$

A.

Battery

B.

Diode

C.

Resistor

D.

Transistor

32 $What happens to the resistance of a metallic conductor when its temperature increases?$

A.

It increases

B.

It decreases

C.

It remains constant

D.

It becomes zero

33 $In a node with 3 branches, if 2A enters, 3A enters, and current leaves, what is the value of ?$

A.

6 A

B.

-1 A

C.

1 A

D.

5 A

34 $A 'Supernode' is formed in Nodal analysis when:$

A.

A current source is between two non-reference nodes

B.

A voltage source is connected between a non-reference node and the ground

C.

A resistor is in parallel with a voltage source

D.

A voltage source is connected between two non-reference nodes

35 $If the voltage across a capacitor increases from 0V to 10V, the energy stored is:$

A.

200 J

B.

20 J

C.

10 J

D.

100 J

36 $The property of a circuit element to oppose the change in current flowing through it is called:$

A.

Inductance

B.

Resistance

C.

Capacitance

D.

Conductance

37 $In Source Transformation, a voltage source in series with resistance can be converted into:$

A.

A current source in parallel with

B.

A current source in series with

C.

A current source in series with

D.

A current source in parallel with

38 $If three resistors are connected in Delta, the equivalent Star resistance for each leg is:$

A.

B.

C.

D.

39 $A, lamp has a resistance of:$

A.

B.

C.

D.

40 $Which theorem is useful for analyzing a circuit when the load resistance varies, but the rest of the circuit remains constant?$

A.

Mesh Analysis

B.

KCL

C.

Superposition Theorem

D.

Thevenin’s Theorem

41 $If a circuit has nodes and branches, the number of independent KCL equations (nodal equations) required is:$

A.

B.

C.

D.

42 $If a circuit has nodes and branches, the number of independent KVL equations (mesh equations) required is:$

A.

B.

C.

D.

43 $A specific resistor in a circuit dissipates power when voltage source acts alone, and dissipates power when voltage source acts alone. Can we calculate total power as using Superposition?$

A.

Yes, if the resistors are linear.

B.

Yes, if the sources are DC.

C.

No, superposition does not apply to power.

D.

Yes, superposition applies to power.

44 $For a short circuit, the resistance and voltage are theoretically:$

A.

B.

C.

D.

45 $For an open circuit, the resistance and current are theoretically:$

A.

B.

C.

D.

46 $Which of the following is an active element?$

A.

Inductor

B.

Capacitor

C.

Resistor

D.

Voltage Source

47 $The time rate of change of work is defined as:$

A.

Power

B.

Energy

C.

Voltage

D.

Force

48 $In a series circuit, which quantity remains the same across all elements?$

A.

Power

B.

Current

C.

Voltage

D.

None of the above

49 $In a parallel circuit, which quantity remains the same across all parallel branches?$

A.

Power

B.

Resistance

C.

Voltage

D.

Current

50 $If a current of 2A flows through a resistor for 10 seconds, the charge transferred is:$

A.

0.2 C

B.

20 C

C.

5 C

D.

12 C

Unit 1: Fundamentals of D.C. Circuits - Practice Quiz

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