A STATCOM (Static Synchronous Compensator) is installed in a 220 kV network. In what mode should it operate to provide reactive power support during a voltage sag?

The correct answer is D: Voltage source mode (capacitive). During voltage sag, STATCOM operates as a voltage source injecting capacitive reactive power (leading current) to support and restore the system voltage.

What is the main purpose of tristate logic (three-state logic) in digital circuits?

The correct answer is B: Allow multiple outputs to share the same bus line without electrical conflicts. Tristate logic provides high, low, and high-impedance states, enabling multiple devices to connect to a single bus by controlling which device actively drives the line.

A pressure transducer has sensitivity of 0.5 V/bar. If input pressure varies from 0-10 bar, what is the output voltage range?

The correct answer is B: 0-5 V. Output voltage = Sensitivity × Pressure = 0.5 × 10 = 5 V for maximum pressure of 10 bar.

Which semiconductor technology provides the lowest static power consumption?

The correct answer is B: CMOS. CMOS has virtually zero static power consumption because complementary transistors prevent direct paths from supply to ground in steady state.

Which of the following correctly represents the relationship in per-unit system for power?

The correct answer is A: P(pu) = P(MW) / S_base(MVA). In per-unit system, power is expressed as P(pu) = P(actual)/P_base = P(MW)/S_base(MVA), where S_base is typically the system base MVA.

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Electrical Engg (EEE)
Control Systems

Electrical machines, power systems, circuits

14 Q 7 Topics Take Mock Test

Difficulty: All Easy Medium Hard 11–14 of 14

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 Control Systems

In phase-lead compensation, the zero is placed:

A To the left of the pole

B To the right of the pole

C At the same location as the pole

D At the origin

Correct Answer: A. To the left of the pole

EXPLANATION

In lead compensation, zero is placed to the left of pole (closer to origin), providing phase lead to improve transient response and stability margin.

Test

Q.12 Hard Control Systems

The centroid of asymptotes in root locus is located at:

A (∑ poles - ∑ zeros)/(n - m)

B (∑ poles + ∑ zeros)/(n - m)

C (∑ zeros - ∑ poles)/(n - m)

D (n - m)/(∑ poles - ∑ zeros)

Correct Answer: A. (∑ poles - ∑ zeros)/(n - m)

EXPLANATION

Centroid σ = (∑poles - ∑zeros)/(n-m), where n and m are number of poles and zeros respectively.

Test

Q.13 Hard Control Systems

A proportional-integral (PI) controller transfer function is Gc(s) = Kp + Ki/s. Its effect is:

A Increases damping and improves transient response

B Increases system type, reducing steady-state error to zero for step input

C Decreases bandwidth and system stability

D Has no effect on system stability

Correct Answer: B. Increases system type, reducing steady-state error to zero for step input

EXPLANATION

PI controller adds a pole at origin (integral term), increasing system type by 1 and eliminating steady-state error for step and ramp inputs.

Test

Q.14 Hard Control Systems

For a system with open-loop transfer function G(s)H(s) = K/[s(s+1)(s+2)], the number of asymptotes in root locus is:

A 1

B 2

C 3

D 4

Correct Answer: B. 2

EXPLANATION

Number of asymptotes = n - m = 3 - 1 = 2, where n=3 (poles) and m=1 (zeros).

Test

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Electrical Engg (EEE) Control Systems

Electrical Engg (EEE)
Control Systems