Which of the following represents a first-order system?

The correct answer is B: G(s) = K/(τs + 1). A first-order system has only s¹ as the highest power in the denominator. G(s) = K/(τs + 1) is the standard first-order form.

The turn-off time (toff) of a power transistor includes:

The correct answer is B: Storage time plus fall time. Turn-off time (toff) = Storage time (ts) + Fall time (tf). Storage time is delay before current starts decreasing; fall time is the time for current to reach zero.

The stability of a power system depends on which of the following factors?

The correct answer is B: Inertia constant, damping torque, and synchronizing torque. Power system stability is determined by the rotor dynamics characterized by inertia (M), damping (D), and synchronizing coefficient (Ks).

An AC bridge circuit is used to measure unknown capacitance. At balance, the product of opposite arms satisfies which condition?

The correct answer is C: Z₁ × Z₄ = Z₂ × Z₃. For AC bridges at balance condition: Z₁ × Z₄ = Z₂ × Z₃, where Z represents impedance of arms.

What is the typical efficiency range of modern power MOSFETs in switching applications?

The correct answer is C: 90-98%. Modern power MOSFETs in well-designed switching converters achieve efficiency in the range of 90-98%, depending on operating point and circuit design

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Electrical Engg (EEE)
Circuit Analysis

Electrical machines, power systems, circuits

39 Q 7 Topics Take Mock Test

Difficulty: All Easy Medium Hard 31–39 of 39

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.31 Easy Circuit Analysis

In Thevenin's theorem, what is the Thevenin equivalent voltage (VTh)?

A The voltage across the load terminals when load is connected

B The open-circuit voltage across the terminals where load is removed

C The voltage drop across the internal resistance

D The maximum voltage the source can provide

Correct Answer: B. The open-circuit voltage across the terminals where load is removed

EXPLANATION

Thevenin equivalent voltage is the open-circuit voltage measured across the two terminals when the load is removed from the circuit.

Test

Q.32 Easy Circuit Analysis

An ideal voltage source has internal resistance of:

A Zero

B Infinite

C Equal to load resistance

D 1 Ω

Correct Answer: A. Zero

EXPLANATION

An ideal voltage source maintains constant voltage regardless of load, which requires zero internal resistance.

Test

Q.33 Easy Circuit Analysis

In a purely inductive circuit, the current lags the voltage by:

A 90°

B 0°

C 45°

D 60°

Correct Answer: A. 90°

EXPLANATION

In a purely inductive circuit, current lags voltage by 90° due to self-inductance effects.

Test

Q.34 Easy Circuit Analysis

For a node in a circuit applying Kirchhoff's Current Law (KCL), the sum of currents entering equals:

A The sum of currents leaving the node

B The voltage at the node

C Zero for any configuration

D The total power dissipated

Correct Answer: A. The sum of currents leaving the node

EXPLANATION

KCL states that the algebraic sum of currents at a node is zero, meaning currents entering equal currents leaving.

Test

Q.35 Easy Circuit Analysis

The resonant frequency of a series RLC circuit is given by:

A f = 1/(2π√LC)

B f = 2π√LC

C f = √(LC)/(2π)

D f = 1/(√LC)

Correct Answer: A. f = 1/(2π√LC)

EXPLANATION

At resonance, XL = XC, leading to the resonant frequency formula f₀ = 1/(2π√LC).

Test

Q.36 Easy Circuit Analysis

In a purely resistive AC circuit, the phase difference between voltage and current is:

A 0°

B 90°

C 45°

D 180°

Correct Answer: A. 0°

EXPLANATION

In a purely resistive circuit, voltage and current are in phase, so the phase difference is 0°.

Test

Q.37 Easy Circuit Analysis

For maximum power transfer in a DC circuit, the load resistance RL should be equal to:

A The Thevenin equivalent resistance RTh

B The Norton equivalent current IN

C Twice the source resistance

D Half the source resistance

Correct Answer: A. The Thevenin equivalent resistance RTh

EXPLANATION

Maximum Power Transfer Theorem states that maximum power is delivered when load resistance equals the Thevenin equivalent resistance of the source.

Test

Q.38 Easy Circuit Analysis

The power factor of an AC circuit is defined as:

A cos(φ) where φ is the phase angle between voltage and current

B sin(φ) where φ is the phase angle between voltage and current

C tan(φ) where φ is the phase angle between voltage and current

D 1/cos(φ)

Correct Answer: A. cos(φ) where φ is the phase angle between voltage and current

EXPLANATION

Power factor is the cosine of the phase angle between voltage and current, representing the fraction of apparent power that is real power.

Test

Q.39 Easy Circuit Analysis

In a series RLC circuit, the impedance Z is given by:

A Z = √(R² + (XL - XC)²)

B Z = R + XL + XC

C Z = √(R² + XL² + XC²)

D Z = R + √(XL - XC)

Correct Answer: A. Z = √(R² + (XL - XC)²)

EXPLANATION

Impedance in a series RLC circuit is the vector sum of resistance and net reactance. Z = √(R² + (XL - XC)²) is the standard formula.

Test

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Electrical Engg (EEE) Circuit Analysis

Electrical Engg (EEE)
Circuit Analysis