Electrical Drives Situational-Based MCQs - Advanced to Expert

Electrical Drives Situational-Based MCQs - Advanced to Expert

University

40 Qs

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Electrical Drives Situational-Based MCQs - Advanced to Expert

Electrical Drives Situational-Based MCQs - Advanced to Expert

Assessment

Quiz

Engineering

University

Practice Problem

Easy

Created by

Nestor Philips

Used 1+ times

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40 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

You are designing a high-speed spindle motor for CNC. Which control method ensures precision and stability?

Scalar control (V/f)

Field-Oriented Control (FOC) with encoder feedback

Open-loop PWM

Phase-angle control

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A high-speed drive exhibits oscillations during acceleration. What control strategy can help stabilize it?

Increase PWM frequency

Apply notch filter and feedforward control

Use soft starter

Use DTC

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A traction motor requires torque boost during low-speed startup. Best solution?

High rotor inertia

Voltage boost at low frequency or flux compensation

Phase reversal

Pulse injection

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Your regenerative elevator drive fails under peak load. Likely reason?

Motor too large

DC link overvoltage and inadequate braking resistor sizing

Excessive slip

Bad alignment

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In sensorless vector control, what can cause instability at low speeds?

Over-modulation

Inaccurate rotor flux estimation due to low back EMF

High V/f ratio

Encoder noise

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In a PMSM drive with FOC, what causes torque ripple at high speed?

Demagnetization

Improper current vector angle control

Low frequency noise

Low carrier modulation

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A BLDC motor used in robotics stalls under sudden load. Recommended strategy?

Increase speed

Implement current limit and acceleration ramping

Use DTC

Bypass sensor

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