What is the primary function of phase-shifting transformers in Indian grid operation?

The correct answer is A: To control power flow direction and magnitude on interconnected transmission lines. Phase-shifting transformers control power flow by introducing a phase shift between primary and secondary voltages, enabling effective power flow management on parallel transmission corridors in Indian grid.

The crawling phenomenon in induction motors occurs due to:

The correct answer is B: Interaction between fundamental and (6n±1)th harmonic components. Crawling results from 5th, 7th harmonics creating torques at different slip values, causing low-speed oscillations

The settling time of a second-order underdamped system is approximately given by:

The correct answer is A: ts ≈ 4/(ζωₙ). For 2% criteria, settling time ts ≈ 4/(ζωₙ). This is the standard formula for second-order systems.

Which characteristic of CMOS logic makes it suitable for portable devices?

The correct answer is B: Very low static power dissipation. CMOS has minimal static power consumption (only during switching), making it ideal for battery-powered devices.

In delta-to-star transformation, if delta resistances are Ra = 30Ω, Rb = 40Ω, Rc = 50Ω, what is the star resistance R₁ (connected to point corresponding to Ra)?

The correct answer is D: 12Ω. R₁ = (Ra × Rc)/(Ra + Rb + Rc) = (30 × 50)/(30 + 40 + 50) = 1500/120 = 12.5Ω ≈ 12Ω

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Electrical Engg (EEE)
Circuit Analysis

Electrical machines, power systems, circuits

12 Q 7 Topics Take Mock Test

Difficulty: All Easy Medium Hard 11–12 of 12

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 Hard Circuit Analysis

For a transmission line with characteristic impedance Z₀ = 50 Ω and load impedance ZL = 100 Ω, the reflection coefficient is:

A 0.33

B 0.5

C 0.67

D 1.0

Correct Answer: A. 0.33

EXPLANATION

Reflection coefficient Γ = (ZL - Z₀)/(ZL + Z₀) = (100 - 50)/(100 + 50) = 50/150 = 1/3 ≈ 0.33.

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Q.12 Hard Circuit Analysis

In a complex circuit using superposition theorem, the total response is found by:

A Adding the responses due to each independent source acting alone

B Multiplying individual responses

C Taking the average of all responses

D Finding the RMS of individual responses

Correct Answer: A. Adding the responses due to each independent source acting alone

EXPLANATION

Superposition states that the total response is the linear sum of responses to each independent source acting alone.

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Electrical Engg (EEE) Circuit Analysis

Electrical Engg (EEE)
Circuit Analysis