What is the output of an SR flip-flop when S=1 and R=1 (NOR gate implementation)?

The correct answer is C: Q=0, Q'=0 (Invalid state). When both S=1 and R=1 in NOR-based SR flip-flop, both outputs become 0, which violates the Q and Q' complementary property, making it an invalid state.

For a second-order system with natural frequency ωn = 2 rad/s and damping ratio ζ = 0.5, the system is:

The correct answer is B: Underdamped. When ζ < 1 (0.5 < 1), the system is underdamped with oscillatory transient response.

Which of the following correctly represents the relationship between the steady-state stability limit and transient stability limit?

The correct answer is B: Transient stability limit > Steady-state stability limit. The transient stability limit is always greater than the steady-state stability limit. A system can maintain transient stability even after a disturbance that would violate steady-state stability.

What is the effect of adding a pole at the origin to a stable open-loop system?

The correct answer is C: Decreases both phase and gain margins. Adding a pole at origin adds -90° phase shift at all frequencies, decreasing phase margin. It also reduces high-frequency gain, decreasing gain margin

In a transformer connected to a load with lagging power factor, the secondary current will:

The correct answer is B: Lag the secondary voltage. If the load has lagging power factor, the secondary current lags the secondary voltage. The phase relationship between primary and secondary depends on the load power factor.

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Electrical Engg (EEE)
Circuit Analysis

Electrical machines, power systems, circuits

39 Q 7 Topics Take Mock Test

Difficulty: All Easy Medium Hard 11–20 of 39

Topics in Electrical Engg (EEE)

All Circuit Analysis 100 Electrical Machines 100 Power Systems 100 Control Systems 100 Power Electronics 100 Electrical Measurements 40 Digital Electronics 100

Q.11 Easy Circuit Analysis

The Thevenin equivalent resistance (Rth) is found by:

A Shorting all independent voltage sources and opening all current sources

B Opening all independent voltage sources and shorting all current sources

C Removing the load resistance and calculating equivalent resistance

D Both A and C are correct

Correct Answer: D. Both A and C are correct

EXPLANATION

Rth is calculated by deactivating all independent sources (short voltage sources, open current sources) and finding equivalent resistance seen from load terminals.

Test

Q.12 Easy Circuit Analysis

For a linear network, the superposition theorem applies when the network contains:

A Only resistive elements

B Only independent sources

C Both linear and non-linear elements

D Multiple independent sources and linear elements

Correct Answer: D. Multiple independent sources and linear elements

EXPLANATION

Superposition theorem applies to linear networks with multiple independent sources. The response is the sum of individual source responses.

Test

Q.13 Easy Circuit Analysis

In nodal analysis, the number of independent node equations required for a circuit with 'n' nodes and one reference node is:

A n-1

B n

C n+1

D 2n-1

Correct Answer: A. n-1

EXPLANATION

In nodal analysis, we need (n-1) independent equations where n is total number of nodes. One node is chosen as reference (ground) node.

Test

Q.14 Easy Circuit Analysis

In a circuit analysis problem, the voltage across a 5Ω resistor is measured as 25V. Using Ohm's law, what is the current through the resistor?

A 2A

B 5A

C 10A

D 20A

Correct Answer: B. 5A

EXPLANATION

Using Ohm's law: I = V/R = 25/5 = 5A

Test

Q.15 Easy Circuit Analysis

In a circuit with two parallel resistors R₁ = 6Ω and R₂ = 12Ω, what is the equivalent resistance?

A 2Ω

B 4Ω

C 6Ω

D 9Ω

Correct Answer: B. 4Ω

EXPLANATION

Req = (R₁ × R₂)/(R₁ + R₂) = (6 × 12)/(6 + 12) = 72/18 = 4Ω

Test

Q.16 Easy Circuit Analysis

A 100Ω resistor is connected across a 50V DC source. What is the power dissipated?

A 25W

B 50W

C 75W

D 100W

Correct Answer: A. 25W

EXPLANATION

Power P = V²/R = (50)²/100 = 2500/100 = 25W

Test

Q.17 Easy Circuit Analysis

A capacitor with capacitance C = 50μF is charged to 200V. What is the energy stored in the capacitor?

A 0.5J

B 1J

C 2J

D 5J

Correct Answer: B. 1J

EXPLANATION

Energy stored E = ½CV² = ½ × 50×10⁻⁶ × (200)² = ½ × 50×10⁻⁶ × 40000 = 1J

Test

Q.18 Easy Circuit Analysis

In a three-phase balanced circuit with line voltage VL = 440V, what is the phase voltage (Vph) in star connection?

A 254V

B 440V

C 762V

D 220V

Correct Answer: A. 254V

EXPLANATION

In star connection, Vph = VL/√3 = 440/1.732 ≈ 254V

Test

Q.19 Easy Circuit Analysis

What is the Norton equivalent current (In) for a circuit where the short-circuit current between terminals A and B is 5A?

A 2.5A

B 5A

C 10A

D 7.5A

Correct Answer: B. 5A

EXPLANATION

Norton equivalent current is equal to the short-circuit current measured between the terminals, which is 5A.

Test

Q.20 Easy Circuit Analysis

Using superposition theorem for a circuit with two voltage sources V₁ = 10V and V₂ = 5V connected in series with a 10Ω resistor, what is the current when considering only V₁?

A 0.5A

B 1A

C 1.5A

D 2A

Correct Answer: B. 1A

EXPLANATION

When considering only V₁ (V₂ is short-circuited), I₁ = V₁/R = 10/10 = 1A

Test

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Electrical Engg (EEE) Circuit Analysis

Electrical Engg (EEE)
Circuit Analysis