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Electric Machinery and Drives MCQ

1. What is a frequency converter?

An electronic device which is used to provide an adjustment facility for the speed of a three-phase motor.

A device which is used to provide an adjustment facility for the speed of a single-phase motor.

A device which is used to provide an adjustment facility for the speed of a four-phase motor.

A device which is used to provide an adjustment facility for the speed of a two-phase motor.

Answer

Correct Answer: An electronic device which is used to provide an adjustment facility for the speed of a three-phase motor.

Note: This Question is unanswered, help us to find answer for this one

2. What type of interfaces do field buses offer?

Parallel

Wireless

USB

Serial

Answer

Correct Answer: Serial

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3. What outputs a certain number of pulses after a defined motion?

Capacitor

Encoder

Inductor

Transformer

Answer

Correct Answer: Encoder

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4. What is the purpose of an emergency-stop circuit?

To bring a machine into a safe state if a hazard is detected

To restart a machine

To increase the speed of a machine

To turn off a machine

Answer

Correct Answer: To bring a machine into a safe state if a hazard is detected

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5. How does an electronic brake function?

Decreases the speed

Applies the brakes

Increases the speed

Switches a motor to act like a generator

Answer

Correct Answer: Switches a motor to act like a generator

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6. What is the main advantage of a direct drive?

Direct drives are more expensive than other motor types.

Direct drives are less efficient than other motor types.

Very high forces can be generated at low speeds.

Very high speeds can be generated at low forces

Answer

Correct Answer: Very high forces can be generated at low speeds.

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7. What does the abbreviation "DC" stand for?

Data center

Direct current

District of Columbia

Duty cycle

Answer

Correct Answer: Direct current

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8. What is a controller?

A device that measures or controls quantities such as speed or temperature

An electronic device which processes all its inputs within a defined period and sets its outputs accordingly.

A device used to start or stop a machine

A device which regulates the speed or direction of an object

Answer

Correct Answer: An electronic device which processes all its inputs within a defined period and sets its outputs accordingly.

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9. What is the control circuit used for?

To manage switches and displays

To route the load circuit

To provide a power supply for electronic devices

To provide power for logic components only

Answer

Correct Answer: To provide a power supply for electronic devices

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10. What does closed-loop control mean?

The system is not operated

The system is operated manually

A controlled variable is measured and an electronic controller reacts as appropriate to this measurement.

The control system is disconnected from the process

Answer

Correct Answer: A controlled variable is measured and an electronic controller reacts as appropriate to this measurement.

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11. What activates the rotating magnetic field in an electric motor?

The presence of a magnetic field

The rotation of the motor itself

Power

The attraction of two magnetic fields

Answer

Correct Answer: Power

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12. What makes an electric motor work?

The power of electricity

The attraction of two magnetic fields

The interaction of two electrical fields

The rotating of a magnetic field

Answer

Correct Answer: The attraction of two magnetic fields

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13. What does AC stand for?

Alternating current

Avogadro's Number

Coulombs

Absolute Zero

Answer

Correct Answer: Alternating current

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14. What is the reference point for absolute positioning?

Fixed reference point

Zero point

Incremental positioning

Relative reference point

Answer

Correct Answer: Zero point

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15. With an absolute measuring system, what is the position of the axis measured relative to?

The object being measured

Always a fixed reference point

The position of the object being observed

The observer's position

Answer

Correct Answer: Always a fixed reference point

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