In a power system, the angle between voltage and current phasors is known as:

The correct answer is B: Phase angle. The phase angle (φ) between voltage and current phasors determines the power factor of the system.

In load flow analysis, which bus type is used to specify active power and voltage magnitude?

The correct answer is A: PV (Generator) bus. PV buses represent generators where active power injection and voltage magnitude are specified; reactive power is calculated.

The Q-factor of a resonant circuit is defined as:

The correct answer is B: Ratio of resonant frequency to bandwidth. Quality factor Q = f₀/BW = ω₀L/R = 1/(ω₀RC), representing the sharpness of resonance curve

In a Priority encoder, when multiple inputs are high simultaneously, which input gets priority?

The correct answer is C: Depends on design specification. Priority encoders can be designed with either highest or lowest priority encoding based on the application requirements specified in the design.

Which factor does NOT directly affect the surge impedance loading (SIL) of a transmission line?

The correct answer is C: Length of transmission line. SIL = V²/Z_c, where Z_c is surge impedance = √(L/C). It depends on L and C per unit length and frequency, but NOT on total line length.

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Electrical Engg (EEE)
Power Systems

Electrical machines, power systems, circuits

22 Q 7 Topics Take Mock Test

Difficulty: All Easy Medium Hard 21–22 of 22

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.21 Hard Power Systems

The critical clearing time in transient stability refers to:

A Maximum time for fault removal to maintain system stability

B Time taken to clear the fault completely

C Time constant of the generator

D Duration of relay operation

Correct Answer: A. Maximum time for fault removal to maintain system stability

EXPLANATION

Critical clearing time is the maximum duration a fault can exist before the system loses synchronism and becomes unstable.

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Q.22 Hard Power Systems

The swing equation in power system stability is given by:

A M(d²δ/dt²) = P_m - P_e - D(dδ/dt)

B M(d²δ/dt²) = P_e - P_m + D(dδ/dt)

C d²δ/dt² = (P_m - P_e)/J

D dδ/dt = (P_m - P_e)/M

Correct Answer: A. M(d²δ/dt²) = P_m - P_e - D(dδ/dt)

EXPLANATION

The swing equation relates angular acceleration to net mechanical power (P_m), electrical power (P_e), and damping coefficient (D).

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Electrical Engg (EEE) Power Systems

Electrical Engg (EEE)
Power Systems