In a 4-to-1 multiplexer, how many select lines are required?

The correct answer is B: 2. For a 4-to-1 multiplexer, we need log₂(4) = 2 select lines to choose one of 4 input lines.

For a system G(s) = 1/(s(s+2)), the number of poles at origin is:

The correct answer is B: One. The system has one pole at s=0, making it Type 1. The denominator has s¹ factor representing one integration.

In a DC generator, the commutator serves the purpose of:

The correct answer is B: Converting AC induced EMF to DC. The commutator rectifies the alternating EMF induced in the armature coils to produce unidirectional (DC) output.

The fault level (short-circuit capacity) at a bus is determined by:

The correct answer is A: The Thevenin equivalent impedance as seen from that bus. Fault level = MVA base / (Zth in p.u.), where Zth is the equivalent impedance of the entire network.

In India's 2024-25 grid, which state has the highest installed renewable energy capacity?

The correct answer is A: Gujarat. Gujarat leads in combined renewable capacity including solar parks and wind farms as per latest 2024-25 CEA reports.

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Electrical Engg (EEE)
Control Systems

Electrical machines, power systems, circuits

53 Q 7 Topics Take Mock Test

Difficulty: All Easy Medium Hard 51–53 of 53

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.51 Medium Control Systems

The gain margin of a system can be determined from the bode plot as:

A The frequency at which phase is -180°

B The magnitude at phase crossover frequency

C 1/magnitude at phase crossover frequency (in linear form)

D The frequency at which magnitude is 1

Correct Answer: C. 1/magnitude at phase crossover frequency (in linear form)

EXPLANATION

Gain margin = 1/|G(jω)| at phase crossover frequency where phase = -180°. It indicates how much gain can be increased before instability.

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Q.52 Medium Control Systems

What does the Routh-Hurwitz criterion determine?

A The bandwidth of the system

B The stability of a linear system without finding poles

C The steady-state error of the system

D The transient response of the system

Correct Answer: B. The stability of a linear system without finding poles

EXPLANATION

Routh-Hurwitz criterion is used to determine the stability of a system by examining the characteristic equation coefficients without calculating poles.

Test

Q.53 Medium Control Systems

What is the steady-state error for a unit step input to a Type 0 system?

A Zero

B Infinity

C 1/(1 + Kp)

D 1/Kp

Correct Answer: C. 1/(1 + Kp)

EXPLANATION

For Type 0 system with unit step input, e_ss = 1/(1 + Kp) where Kp is the position error constant.

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Control Systems