The snubber circuit in power electronics is used to:

The correct answer is A: Reduce switching losses and protect devices from voltage spikes. Snubber circuits (RC networks) protect switching devices from transient voltage spikes during switching transitions and reduce switching losses.

In a three-phase fully controlled bridge rectifier operating at 50 Hz with a firing angle of 60°, what is the average output voltage if the RMS line-to-line voltage is 415V?

The correct answer is B: 280.7 V. For a 3-phase fully controlled rectifier: Vavg = (3√2/π) × Vline × cos(α) = 1.654 × 415 × cos(60°) = 280.7V

In a 132 kV system, if the ground fault setting is 200 A, what is the corresponding relay pickup in percentage of line CT primary rating (2000 A)?

The correct answer is B: 10%. Relay pickup percentage = (200 A / 2000 A) × 100 = 10% of CT primary rating.

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.

In a permanent magnet synchronous motor (PMSM), the torque is primarily developed due to:

The correct answer is A: Interaction between stator current and permanent magnet field. PMSM torque = Pm × Is × sin(δ), where Pm is permanent magnet flux and Is is stator current

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Electrical Engg (EEE)
Control Systems

Electrical machines, power systems, circuits

33 Q 7 Topics Take Mock Test

Difficulty: All Easy Medium Hard 31–33 of 33

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 Control Systems

Which of the following represents a first-order system?

A G(s) = K/(s² + 2s + 5)

B G(s) = K/(τs + 1)

C G(s) = K(s + 1)/(s² + s + 1)

D G(s) = Ks/(s³ + 2s² + 3s + 1)

Correct Answer: B. G(s) = K/(τs + 1)

EXPLANATION

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.

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Q.32 Easy Control Systems

The transfer function of a system is defined as the ratio of:

A Output to input in time domain

B Laplace transform of output to Laplace transform of input with zero initial conditions

C Input to output in frequency domain

D System gain to bandwidth

Correct Answer: B. Laplace transform of output to Laplace transform of input with zero initial conditions

EXPLANATION

Transfer function G(s) = Y(s)/U(s) is the ratio of Laplace transforms of output to input assuming zero initial conditions.

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Q.33 Easy Control Systems

What is the primary function of a feedback control system?

A To reduce the error between desired and actual output

B To increase the system gain

C To eliminate all disturbances

D To increase the bandwidth of the system

Correct Answer: A. To reduce the error between desired and actual output

EXPLANATION

Feedback control systems work by comparing the desired output with actual output and reducing the error between them through corrective action.

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Electrical Engg (EEE)
Control Systems