Which of the following correctly describes the difference between combinational and sequential logic?

The correct answer is B: Sequential logic depends on past inputs and has memory; combinational output depends only on current inputs. Combinational circuits produce outputs based solely on current inputs. Sequential circuits have memory elements (flip-flops) and outputs depend on input history.

Which bridge circuit is most suitable for measuring an unknown capacitance?

The correct answer is C: Owen bridge. Owen bridge is specifically designed for accurate measurement of unknown inductance and capacitance values in AC circuits.

The mutual inductance between two coils is independent of:

The correct answer is C: Current flowing through coils. Mutual inductance depends on geometry, coil configuration, and medium properties, but NOT on the current flowing through them.

In a soft-start thyristor converter, the firing angle is gradually increased to:

The correct answer is A: Reduce inrush current during startup. Soft-start increases firing angle gradually from maximum value, reducing dv/dt and inrush current, protecting equipment and supply system from transients.

Which of the following statements about a DC shunt motor is true?

The correct answer is B: Speed is independent of load at rated voltage. In a DC shunt motor, field is connected in parallel with armature, maintaining nearly constant flux. Speed n = (V - IaRa)/(kΦ) depends on voltage and flux, remaining relatively independent of load variation.

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Electrical Engg (EEE)

Electrical machines, power systems, circuits

123 Q 7 Topics Take Mock Test

Difficulty: All Easy Medium Hard 121–123 of 123

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.121 Hard Circuit Analysis

For a series RLC circuit with R = 10 Ω, L = 0.1 H, C = 100 μF at resonance, what is the resonant frequency?

A 15.92 Hz

B 50.33 Hz

C 159.2 Hz

D 503.3 Hz

Correct Answer: C. 159.2 Hz

EXPLANATION

Resonant frequency f₀ = 1/(2π√LC) = 1/(2π√(0.1 × 100×10⁻⁶)) = 1/(2π × 0.00316) = 159.2 Hz

Test

Q.122 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.

Test

Q.123 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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