DC Circuits: Master the Fundamentals of Electrical Engineering

Question 1

In a parallel circuit, the total power:

Accepted Answer

Is equal to the sum of the branch powers

Answer

Is greater than the sum of the branch powers

Answer

Is less than the sum of the branch powers

Answer

Is independent of the branch voltages

Question 2

In a Norton equivalent circuit, the current source is:

Accepted Answer

Equal to the short-circuit current

Answer

Equal to the open-circuit voltage divided by the Thévenin resistance

Answer

Equal to the load current

Answer

Equal to the maximum current in the circuit

Question 3

Which of the following is a characteristic of an ideal voltage source?

Accepted Answer

Constant voltage regardless of the load

Answer

Infinite internal resistance

Answer

Zero internal resistance

Answer

Constant current regardless of the load

Question 4

In a series DC circuit, the current through each resistor is:

Accepted Answer

Equal

Answer

Different

Answer

Proportional to its resistance

Answer

Proportional to the voltage across it

Question 5

The voltage across a resistor in a parallel circuit is:

Accepted Answer

Equal to the supply voltage

Answer

Proportional to the resistance

Answer

Inversely proportional to the resistance

Answer

Zero

Question 6

Thevenin's theorem allows us to replace a complex circuit with:

Accepted Answer

A single voltage source and a single resistor in series

Answer

A single current source and a single resistor in parallel

Answer

Two voltage sources and two resistors in series

Answer

Two current sources and two resistors in parallel

Question 7

The maximum power transfer theorem states that maximum power is transferred from a source to a load when:

Accepted Answer

The load resistance is equal to the source resistance

Answer

The load resistance is greater than the source resistance

Answer

The load resistance is less than the source resistance

Answer

The load resistance is zero

Question 8

Which law is used to determine the voltage across a resistor in a DC circuit?

Accepted Answer

Ohm's Law

Answer

Kirchhoff's Voltage Law

Answer

Kirchhoff's Current Law

Question 9

In a parallel circuit, the equivalent resistance is:

Accepted Answer

Less than the resistance of any individual resistor

Answer

Greater than the resistance of any individual resistor

Answer

Equal to the resistance of any individual resistor

Question 10

What is the purpose of Thevenin's theorem?

Accepted Answer

To find the equivalent voltage and resistance of a circuit

Answer

To determine the current through a specific branch

Answer

To calculate the power dissipated by a resistor

Question 11

Which theorem is dual to Thevenin's theorem?

Accepted Answer

Norton's theorem

Answer

Ohm's Law

Answer

Kirchhoff's Laws

Question 12

Determine the current through a 10 Ω resistor connected to a 12 V battery using Ohm's Law.

Accepted Answer

1.2 A

Answer

12 A

Answer

120 A

Question 13

In a simple DC circuit with a battery, resistor, and switch, which action would **reduce** the electric current flowing through the circuit?

Accepted Answer

Increasing the resistor's resistance

Answer

Closing the switch

Answer

Increasing the battery's voltage

Question 14

What is a practical limitation of an ideal current source, and how does it affect circuit design?

Accepted Answer

Limited current output due to internal resistance

Answer

Can only be used in series circuits

Answer

Unaffected by changes in load resistance

Answer

Operates only in the ohmic region

Question 15

In a series circuit, the total resistance (RT) is calculated by:

Accepted Answer

Summing the individual resistances (R1, R2, ...) in the circuit.

Answer

Multiplying the individual resistances (R1, R2, ...) in the circuit.

Answer

Subtracting the individual resistances (R1, R2, ...) in the circuit.

Answer

Taking the average of the individual resistances (R1, R2, ...) in the circuit.

Question 16

In a parallel circuit, the combined current (IT) flowing through the circuit is equal to the:

Accepted Answer

Sum of the individual currents (I1, I2, ...) flowing through each branch of the circuit.

Answer

Average of the individual currents (I1, I2, ...) flowing through each branch of the circuit.

Answer

Difference of the individual currents (I1, I2, ...) flowing through each branch of the circuit.

Answer

Product of the individual currents (I1, I2, ...) flowing through each branch of the circuit.

Question 17

Voltage division in a series circuit implies that:

Accepted Answer

The voltage (V) across each resistor is proportional to its resistance (R).

Answer

The voltage (V) across the resistor with the lowest resistance is the lowest.

Answer

The voltage (V) across each resistor is equal to the supply voltage.

Answer

The voltage (V) across the resistor with the highest resistance is the highest.

Question 18

Current division in a parallel circuit follows the rule that:

Accepted Answer

The current (I) through each branch is inversely proportional to its resistance (R).

Answer

The current (I) through the branch with the lowest resistance is the lowest.

Answer

The current (I) through each branch is equal to the supply current.

Answer

The current (I) through the branch with the highest resistance is the highest.

Question 19

Thevenin's theorem is primarily used to:

Accepted Answer

Simplify a complex circuit by replacing it with an equivalent circuit consisting of a single voltage source and a series resistor.

Answer

Find the total resistance of a circuit.

Answer

Simplify a complex circuit by replacing it with an equivalent circuit consisting of a single current source and a parallel resistor.

Answer

Calculate the voltage across a specific component in a circuit.

Question 20

In a DC circuit with two resistors connected in parallel, which of the following statements about the equivalent resistance is true?

Accepted Answer

It is lower than either individual resistance.

Answer

It is higher than either individual resistance.

Answer

It is equal to the sum of the individual resistances.

Question 21

Which of the following is NOT a characteristic of a DC voltage source?

Accepted Answer

Constant current output

Answer

Polarity

Answer

Internal resistance

Answer

Constant voltage output

Question 22

A DC ammeter has an internal resistance of 0.1 Ω. When connected in series with a circuit, it indicates a current of 2 A. What is the actual current flowing in the circuit?

Accepted Answer

1.98 A

Answer

2 A

Answer

2.02 A

Answer

1 A

Question 23

Which of the following is a method for solving DC circuit problems?

Accepted Answer

Mesh analysis

Answer

Monte Carlo simulation

Answer

Laplace transform

Answer

Fourier analysis

Question 24

In a DC circuit, the voltage drop across an inductor initially:

Accepted Answer

Increases exponentially and then reaches a steady state.

Answer

Decreases exponentially and then reaches a steady state.

Answer

Remains constant at all times.