Q. What is the Norton equivalent current in a circuit?
A.The short-circuit current at the terminals
B.The open-circuit voltage
C.The total current in the circuit
D.The current through the load
Solution
The Norton equivalent current is defined as the current that flows through a short circuit placed across the terminals of the circuit.
Correct Answer: A — The short-circuit current at the terminals
Q. What is the Norton equivalent of a circuit?
A.A single voltage source and series resistance
B.A single current source and parallel resistance
C.A combination of inductors
D.A complex impedance
Solution
The Norton equivalent circuit is represented by a single current source in parallel with a resistance, simplifying the analysis of the circuit.
Correct Answer: B — A single current source and parallel resistance
Q. What is the phase difference between voltage and current in a purely capacitive AC circuit?
A.0 degrees
B.90 degrees
C.180 degrees
D.270 degrees
Solution
In a purely capacitive circuit, the current leads the voltage by 90 degrees.
Correct Answer: B — 90 degrees
Q. What is the phase difference between voltage and current in a purely resistive AC circuit?
A.0 degrees
B.90 degrees
C.180 degrees
D.270 degrees
Solution
In a purely resistive AC circuit, the voltage and current are in phase, meaning the phase difference is 0 degrees.
Correct Answer: A — 0 degrees
Q. What is the power consumed by a resistor of 10Ω when a current of 2A flows through it?
A.20W
B.40W
C.10W
D.5W
Solution
Power (P) can be calculated using P = I^2 * R. Therefore, P = (2A)^2 * 10Ω = 4 * 10 = 40W.
Correct Answer: A — 20W
Q. What is the power factor in an AC circuit with a resistive load?
A.1
B.0
C.0.5
D.0.707
Solution
The power factor in an AC circuit with a purely resistive load is 1, indicating that all the power is being used effectively.
Correct Answer: A — 1
Q. What is the power factor of a purely resistive AC circuit?
A.0
B.0.5
C.1
D.Infinity
Solution
The power factor is defined as the cosine of the phase angle between voltage and current. In a purely resistive circuit, this angle is 0 degrees, so the power factor is 1.
Correct Answer: C — 1
Q. What is the relationship defined by Ohm's Law?
A.V = I * R
B.P = V * I
C.Z = V / I
D.I = V / R
Solution
Ohm's Law states that the voltage (V) across a conductor is directly proportional to the current (I) flowing through it, with the resistance (R) being the constant of proportionality.
Correct Answer: A — V = I * R
Q. What is the Thevenin equivalent of a circuit?
A.A single voltage source and series resistance
B.A single current source and parallel resistance
C.A combination of capacitors
D.A complex impedance
Solution
The Thevenin equivalent circuit is represented by a single voltage source in series with a resistance, simplifying the analysis of the circuit.
Correct Answer: A — A single voltage source and series resistance
Q. What is the Thevenin equivalent voltage (Vth) across terminals A and B if V1 = 10V and R1 = 5Ω, R2 = 10Ω in series?
A.10V
B.5V
C.15V
D.0V
Solution
In a series circuit, the Thevenin voltage is the same as the source voltage, so Vth = V1 = 10V.
Correct Answer: A — 10V
Q. What is the Thevenin equivalent voltage if a circuit has a 10V source and a 2Ω resistor in series with a 4Ω load?
A.2.5V
B.4V
C.10V
D.12V
Solution
The Thevenin equivalent voltage is the open-circuit voltage across the load, which is the same as the source voltage in this case, 10V.
Correct Answer: C — 10V
Q. What is the Thevenin equivalent voltage in a circuit?
A.The open-circuit voltage at the terminals
B.The short-circuit current
C.The total voltage in the circuit
D.The voltage drop across the load
Solution
The Thevenin equivalent voltage is defined as the open-circuit voltage measured across the terminals of the circuit.
Correct Answer: A — The open-circuit voltage at the terminals
Q. What is the unit of impedance?
A.Ohm
B.Volt
C.Ampere
D.Watt
Solution
The unit of impedance is the Ohm (Ω), which measures the opposition that a circuit presents to the flow of alternating current.
