1. Which of the following is NOT a basic electrical component in a circuit?
A. Resistor
B. Capacitor
C. Inductor
D. Magnet
Answer: D. Magnet
2. Ohm’s Law relates voltage (V), current (I), and resistance (R) in a circuit and is given by:
A. V = IR
B. P = IV
C. P = I²R
D. R = V/I
Answer: A. V = IR
3. What happens to the total resistance when two resistors are connected in parallel?
A. The total resistance increases
B. The total resistance decreases
C. The total resistance remains the same
D. The total resistance becomes zero
Answer: B. The total resistance decreases
4. The power dissipated in a resistor is calculated using the formula:
A. P = IV
B. P = I²R
C. P = V²/R
D. All of the above
Answer: D. All of the above
5. In a series circuit, the current through each component is:
A. The same
B. Different
C. Zero
D. Dependent on the voltage
Answer: A. The same
6. Which of the following is true for DC (Direct Current)?
A. The current alternates direction
B. The current flows in one direction only
C. The voltage is sinusoidal
D. The current changes amplitude constantly
Answer: B. The current flows in one direction only
7. In an AC circuit, the power factor is defined as:
A. The ratio of voltage to current
B. The ratio of real power to apparent power
C. The voltage at the source
D. The amount of energy stored
Answer: B. The ratio of real power to apparent power
8. Which of the following components is commonly used to block DC while allowing AC to pass through?
A. Resistor
B. Capacitor
C. Inductor
D. Transformer
Answer: B. Capacitor
9. The root mean square (RMS) value of an AC signal is important because it represents the equivalent value of:
A. The peak voltage
B. The average voltage
C. The maximum power
D. The constant DC voltage that would produce the same power
Answer: D. The constant DC voltage that would produce the same power
10. A capacitor in a circuit stores:
A. Electrical energy
B. Magnetic energy
C. Kinetic energy
D. Chemical energy
Answer: A. Electrical energy
11. In an RL circuit, the inductor opposes changes in current due to:
A. Its resistance
B. Its capacitance
C. Its inductance
D. Its voltage drop
Answer: C. Its inductance
12. The primary function of a diode in a circuit is to:
A. Store energy
B. Amplify signals
C. Allow current to flow in one direction only
D. Block all current flow
Answer: C. Allow current to flow in one direction only
13. A transformer operates on the principle of:
A. Faraday’s law of electromagnetic induction
B. Lenz’s law of magnetic flux
C. The law of conservation of energy
D. The electrostatic principle
Answer: A. Faraday’s law of electromagnetic induction
14. Which of the following is the main application of a transistor in a circuit?
A. Voltage regulation
B. Amplification
C. Rectification
D. Power generation
Answer: B. Amplification
15. A system where the output is fed back into the input to regulate performance is called a:
A. Open-loop system
B. Closed-loop system
C. Linear system
D. Nonlinear system
Answer: B. Closed-loop system
16. In a feedback system, positive feedback leads to:
A. Stabilization of the system
B. Oscillations or instability
C. Constant output
D. Decreased system sensitivity
Answer: B. Oscillations or instability
17. A transfer function in a control system represents the relationship between:
A. The input and output
B. Voltage and current
C. Resistance and inductance
D. Capacitance and voltage
Answer: A. The input and output
18. In a series resonant circuit, the impedance is at a minimum at the resonant frequency because:
A. The inductive reactance and capacitive reactance cancel each other
B. The resistance is zero
C. The current becomes maximum
D. The voltage becomes zero
Answer: A. The inductive reactance and capacitive reactance cancel each other
19. Which of the following is the application of Kirchhoff’s Current Law (KCL)?
A. The sum of all currents entering a node equals the sum of all currents leaving the node.
B. The sum of voltages around any closed loop is zero.
C. The sum of all resistances in a series circuit is equal to the total resistance.
D. The total power delivered by the sources equals the total power absorbed by the resistors.
Answer: A. The sum of all currents entering a node equals the sum of all currents leaving the node.
20. Thevenin’s Theorem helps in:
A. Simplifying a complex network to an equivalent two-terminal circuit
B. Finding the total current in a circuit
C. Calculating the power delivered by a source
D. None of the above
Answer: A. Simplifying a complex network to an equivalent two-terminal circuit