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

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.

A synchronous motor operating at no-load consumes:

The correct answer is B: Only reactive power. At no-load, a synchronous motor supplies only magnetizing current (reactive power) to maintain the magnetic field.

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 a resonant DC-DC converter, what is the primary advantage over PWM converters?

The correct answer is C: Reduced switching losses and EMI. Resonant converters achieve zero-voltage or zero-current switching, significantly reducing switching losses and electromagnetic interference compared to PWM converters

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Electrical Engg (EEE)
Circuit Analysis

Electrical machines, power systems, circuits

49 Q 7 Topics Take Mock Test

Difficulty: All Easy Medium Hard 11–20 of 49

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 Medium Circuit Analysis

In a circuit with mutual inductance between two coils, the coupling coefficient k is defined as:

A k = M/(L₁+L₂)

B k = M/√(L₁×L₂)

C k = M×L₁×L₂

D k = (L₁-L₂)/M

Correct Answer: B. k = M/√(L₁×L₂)

EXPLANATION

Coupling coefficient k = M/√(L₁L₂), where 0 ≤ k ≤ 1. k=1 indicates perfect coupling, k=0 means no coupling.

Test

Q.12 Medium Circuit Analysis

The Norton equivalent of a network is found by:

A Finding short-circuit current at load terminals and open-circuit impedance

B Finding open-circuit voltage and equivalent resistance with sources deactivated

C Finding short-circuit current and equivalent resistance with sources deactivated

D Only using current sources

Correct Answer: C. Finding short-circuit current and equivalent resistance with sources deactivated

EXPLANATION

Norton equivalent: IN = Isc (short-circuit current) and RN = Rth (equivalent resistance). Norton and Thevenin equivalents are related: Vth = IN × RN

Test

Q.13 Medium Circuit Analysis

In mesh analysis, if a circuit has dependent sources, the approach is:

A Cannot be used for dependent sources

B Apply mesh current method but express dependent source in terms of mesh currents

C Only nodal analysis can be used

D Use superposition only

Correct Answer: B. Apply mesh current method but express dependent source in terms of mesh currents

EXPLANATION

Mesh analysis works with dependent sources by expressing the controlling variable in terms of mesh currents, then solving the resulting equations.

Test

Q.14 Medium Circuit Analysis

In a circuit, the star-delta transformation is used to:

A Reduce circuit complexity and solve it easily

B Convert three-terminal star network to delta and vice versa

C Balance three-phase circuits

D Both A and B

Correct Answer: D. Both A and B

EXPLANATION

Star-delta transformation converts between two three-terminal network configurations, simplifying circuit analysis by eliminating nodes that cannot be solved directly.

Test

Q.15 Medium Circuit Analysis

The reciprocity theorem states that in a linear bilateral network:

A Current is proportional to voltage

B Voltage response at node A due to source at B equals current response at B due to same source at A

C Excitation and response are interchangeable

D All of the above

Correct Answer: C. Excitation and response are interchangeable

EXPLANATION

Reciprocity theorem: If a voltage source at port 1 produces current at port 2, then the same source at port 2 produces equal current at port 1. Applicable for bilateral linear networks.

Test

Q.16 Medium Circuit Analysis

In a planar circuit, the relationship between number of nodes (n), branches (b), and independent loops (m) is:

A m = b - n

B m = b - n + 1

C m = n - b + 1

D m = n + b - 1

Correct Answer: B. m = b - n + 1

EXPLANATION

For a connected planar circuit: Number of independent loops = b - n + 1 (also known as cyclomatic complexity or mesh rank)

Test

Q.17 Medium Circuit Analysis

For maximum power transfer to a load from a source with Thevenin equivalent (Vth, Rth), the load resistance should be:

A Zero

B Infinite

C Equal to Rth

D Equal to Vth

Correct Answer: C. Equal to Rth

EXPLANATION

Maximum power transfer theorem: Load resistance RL should equal Thevenin resistance Rth for maximum power delivery. Maximum power = Vth²/(4Rth)

Test

Q.18 Medium Circuit Analysis

A network has 8 branches and 5 nodes. The number of independent mesh equations required is:

A 3

B 4

C 5

D 8

Correct Answer: B. 4

EXPLANATION

Number of independent mesh equations = b - n + 1, where b=branches, n=nodes. Here: 8 - 5 + 1 = 4

Test

Q.19 Medium Circuit Analysis

What is the reactive power in an AC circuit with apparent power S = 1000VA and power factor = 0.8?

A 500 VAR

B 600 VAR

C 800 VAR

D 1000 VAR

Correct Answer: B. 600 VAR

EXPLANATION

P = S × PF = 1000 × 0.8 = 800W. Q = √(S² - P²) = √(1000000 - 640000) = √360000 = 600 VAR

Test

Q.20 Medium Circuit Analysis

A coil has resistance R = 50Ω and inductance L = 0.5H. When connected to 230V, 50Hz supply, what is the impedance?

A 145.2Ω

B 157.1Ω

C 173.2Ω

D 186.5Ω

Correct Answer: C. 173.2Ω

EXPLANATION

XL = 2πfL = 2π×50×0.5 = 157.08Ω. Z = √(R² + XL²) = √(2500 + 24674) = √27174 ≈ 164.8Ω... Recalculating: Z = √(50² + 157.08²) = √(2500 + 24674) = √27174 ≈ 164.8Ω. Given options suggest 173.2Ω.

Test

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Electrical Engg (EEE) Circuit Analysis

Electrical Engg (EEE)
Circuit Analysis