The equivalent resistance of two resistors in parallel is always:

The correct answer is A: Less than the smaller resistor. For parallel resistors: Req = (R1×R2)/(R1+R2), which is always less than the smaller individual resistor.

In mesh analysis, what does each mesh equation represent?

The correct answer is B: Kirchhoff's voltage law around each mesh loop. Mesh analysis applies Kirchhoff's voltage law (KVL) around each independent mesh loop in the circuit

Which of the following topologies is most suitable for soft-switching operation in modern DC-DC converters?

The correct answer is B: Resonant converter. Resonant converters inherently provide soft-switching conditions through LC resonance, reducing switching losses and EMI compared to hard-switching topologies.

In a circuit with mutual inductance M between two coils, if the coupling coefficient k = 0.8, L1 = 10H, then L2 is at least:

The correct answer is A: 6.25H. Coupling coefficient k = M/√(L1·L2). For k=0.8 and L1=10H: 0.8 = M/√(10·L2). Since M ≤ √(L1·L2), we get L2 ≥ (M/k)²/L1 = (10·k²)/k² = L1/k² = 10/0.64 = 15.625H minimum requires M evaluation, but using k = M/√(L1L2) ≤ 1 gives L2 ≥ 6.25H.

In a half-bridge inverter, what is the minimum number of switches required to generate AC output from DC source?

The correct answer is A: 2. A half-bridge inverter requires 2 switches (typically with 2 diodes) to generate AC output from a DC source

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Electrical Engg (EEE)

Electrical machines, power systems, circuits

196 Q 7 Topics Take Mock Test

Difficulty: All Easy Medium Hard 161–170 of 196

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.161 Easy Circuit Analysis

The superposition theorem can be applied to find which of the following in a circuit?

A Power dissipation only

B Voltage and current

C Resistance only

D Impedance only

Correct Answer: B. Voltage and current

EXPLANATION

Superposition theorem applies to linear networks and can be used to find voltage and current, but NOT power (since power is non-linear function).

Test

Q.162 Easy Circuit Analysis

A voltage source of 10V with internal resistance 2Ω is connected to a load resistance of 8Ω. The maximum power transfer to the load occurs when load resistance is:

A 2Ω

B 8Ω

C 10Ω

D 4Ω

Correct Answer: A. 2Ω

EXPLANATION

Maximum power transfer theorem states that maximum power is transferred when load resistance equals the Thevenin equivalent resistance of the source (2Ω in this case).

Test

Q.163 Easy Circuit Analysis

In nodal analysis, the number of independent equations required to solve a circuit with 'n' nodes (excluding the reference node) is:

A n-1

B n

C n+1

D 2n

Correct Answer: A. n-1

EXPLANATION

In nodal analysis, we need (n-1) independent KCL equations for n nodes, where one node is taken as reference (ground). This follows from the fact that one equation is dependent on others.

Test

Q.164 Easy Circuit Analysis

For a network containing resistances and a single voltage source, if we open-circuit the source terminal, the circuit becomes:

A Active network

B Passive network

C Non-linear network

D Distributed parameter network

Correct Answer: B. Passive network

EXPLANATION

Removing all independent sources leaves only passive elements (resistors), making the network passive with no energy supply capability.

Test

Q.165 Easy Circuit Analysis

A circuit element is said to be active if it:

A Dissipates power only

B Can supply power to the network

C Stores energy only

D Does not contain any source

Correct Answer: B. Can supply power to the network

EXPLANATION

Active elements (voltage/current sources) can supply power. Passive elements (R, L, C) can only dissipate or store energy.

Test

Q.166 Easy Circuit Analysis

A circuit has three meshes. Using mesh current analysis, the total number of mesh current variables are:

A 2

B 3

C 4

D 6

Correct Answer: B. 3

EXPLANATION

Number of mesh current variables equals the number of independent meshes in the circuit. For 3 independent meshes, we have 3 mesh currents (I₁, I₂, I₃).

Test

Q.167 Easy Circuit Analysis

In a bridge circuit at balance condition, the product of opposite resistances are equal. This principle is known as:

A Reciprocity theorem

B Bridge balance principle

C Wheatstone bridge condition

D Thevenin's theorem

Correct Answer: C. Wheatstone bridge condition

EXPLANATION

At Wheatstone bridge balance: R₁/R₂ = R₄/R₃ or R₁×R₃ = R₂×R₄. No current flows through galvanometer.

Test

Q.168 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.169 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.170 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

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