What is the primary function of a Static Synchronous Compensator (STATCOM) in modern power systems?

The correct answer is B: To dynamically control reactive power and stabilize voltage without absorbing active power. STATCOM uses power electronics to inject/absorb reactive power independently from active power, providing fast voltage support and damping of oscillations.

In a 3-bit binary counter with initial state 000, after 9 clock pulses, the state will be:

The correct answer is A: 001. 3-bit counter is MOD-8. After 8 pulses it returns to 000, so after 9 pulses state is 001 (counts 0-7, repeats)

In a 3-phase transformer with Delta-Star connection, the secondary voltage phase angle leads the primary by:

The correct answer is B: 30°. Delta-Star (Dy) connection introduces a 30° phase shift. Secondary voltage leads primary by 30°, which is standard for Dy11 configuration.

In a synchronous buck converter, the advantages of using a low-side MOSFET instead of a diode are:

The correct answer is D: Both A and B. Synchronous MOSFETs have lower on-state resistance than diode forward voltage drop, reducing losses. Active switching also allows higher frequency operation with better control.

Which of the following is the correct relationship for setup time in sequential circuits?

The correct answer is B: Setup time is the time data must be stable before the clock edge. Setup time is the minimum duration that input data must remain stable before the active clock edge for proper capture by the flip-flop.

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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 1–10 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.1 Medium Circuit Analysis

For a circuit under steady-state AC conditions, the impedance of a 5H inductor at 50Hz frequency is approximately:

A 1570.8Ω

B 785.4Ω

C 392.7Ω

D 1963.5Ω

Correct Answer: A. 1570.8Ω

EXPLANATION

XL = 2πfL = 2π(50)(5) = 500π ≈ 1570.8Ω. For pure inductor, impedance is purely reactive with magnitude 1570.8Ω.

Test

Q.2 Medium Circuit Analysis

For a two-port network with H-parameters (hybrid parameters), H21 represents:

A Voltage transfer ratio

B Current transfer ratio

C Input impedance

D Output admittance

Correct Answer: B. Current transfer ratio

EXPLANATION

H21 = I2/I1 (with V2=0) is the current transfer ratio or short-circuit current gain in a two-port network using hybrid parameters.

Test

Q.3 Medium Circuit Analysis

In a circuit with time-varying sources, Kirchhoff's current law states that the algebraic sum of currents at a node is:

A Always zero, regardless of time

B Zero only at steady state

C Zero at all times including transients

D Depends on circuit parameters

Correct Answer: C. Zero at all times including transients

EXPLANATION

KCL is based on charge conservation and applies at ALL times - steady state and transients both. It's independent of whether sources are constant or time-varying.

Test

Q.4 Medium Circuit Analysis

A network is reciprocal if the transfer impedance Z12 equals Z21. This property holds for networks containing:

A Only resistances and inductances

B Only linear passive elements without dependent sources

C Active elements and dependent sources

D Non-linear elements

Correct Answer: B. Only linear passive elements without dependent sources

EXPLANATION

Reciprocity theorem applies to linear passive networks without dependent sources. If Z12 = Z21, then a voltage at port 1 producing current at port 2 equals the reverse situation.

Test

Q.5 Medium Circuit Analysis

The Thevenin equivalent resistance (RTh) of a network is found by:

A Replacing all independent sources with short circuits and calculating resistance

B Replacing all independent sources with open circuits and calculating resistance

C Keeping dependent sources, replacing independent sources with their internal resistances

D Both A and C are correct

Correct Answer: D. Both A and C are correct

EXPLANATION

RTh is calculated by replacing independent voltage sources with short circuits and independent current sources with open circuits, while keeping dependent sources intact.

Test

Q.6 Medium Circuit Analysis

Which method is most suitable for analyzing a circuit containing multiple independent and dependent sources?

A Nodal analysis only

B Mesh analysis only

C Either nodal or mesh analysis

D Superposition theorem only

Correct Answer: C. Either nodal or mesh analysis

EXPLANATION

Both nodal and mesh analysis can handle dependent sources. The choice depends on circuit configuration - nodal for current sources, mesh for voltage sources.

Test

Q.7 Medium Circuit Analysis

In a circuit with a dependent voltage source controlled by current, the controlling current flows through:

A A series element in the control branch

B An independent voltage source in control branch

C Any element but measured in specific direction

D Only resistive elements

Correct Answer: C. Any element but measured in specific direction

EXPLANATION

A CCVS (Current-Controlled Voltage Source) depends on current through any element in the control branch, measured in the specified reference direction.

Test

Q.8 Medium Circuit Analysis

For a two-port network, if Z-parameters are known, the relationship between input impedance and Z11 is:

A Zin = Z11 only when port 2 is short-circuited

B Zin = Z11 always

C Zin = Z11 only when port 2 is open-circuited

D Zin is independent of Z11

Correct Answer: C. Zin = Z11 only when port 2 is open-circuited

EXPLANATION

Z11 is defined as input impedance with port 2 open-circuited (I2=0). Therefore, Zin = Z11 only under this condition.

Test

Q.9 Medium Circuit Analysis

A network is said to be bilateral if:

A It contains only two branches

B Its response is same regardless of direction of current flow

C It has two voltage sources

D It contains both resistive and reactive elements

Correct Answer: B. Its response is same regardless of direction of current flow

EXPLANATION

Bilateral networks are linear networks where reciprocal relationships hold. Networks with ideal diodes are unilateral (non-bilateral).

Test

Q.10 Medium Circuit Analysis

In a magnetically coupled circuit with two inductors L₁ and L₂ with mutual inductance M, if current increases in primary, the induced voltage in secondary opposes this change. This demonstrates:

A Lenz's law

B Faraday's law

C Both A and B

D Ampere's law

Correct Answer: C. Both A and B

EXPLANATION

Faraday's law describes EMF generation; Lenz's law describes the direction (opposition to change). Both apply to mutual inductance phenomena.

Test

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Electrical Engg (EEE) Circuit Analysis

Electrical Engg (EEE)
Circuit Analysis