Electric Machinery and Drives MCQs
Electric Machinery and Drives MCQs
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1: With an absolute measuring system, what is the position of the axis measured relative to?
A. The object being measured
B. Always a fixed reference point
C. The position of the object being observed
D. The observer's position
2: What is the reference point for absolute positioning?
A. Fixed reference point
B. Zero point
C. Incremental positioning
D. Relative reference point
3: What does AC stand for?
A. Alternating current
B. Avogadro's Number
C. Coulombs
D. Absolute Zero
4: What makes an electric motor work?
A. The power of electricity
B. The attraction of two magnetic fields
C. The interaction of two electrical fields
D. The rotating of a magnetic field
5: What activates the rotating magnetic field in an electric motor?
A. The presence of a magnetic field
B. The rotation of the motor itself
C. Power
D. The attraction of two magnetic fields
6: What does closed-loop control mean?
A. The system is not operated
B. The system is operated manually
C. A controlled variable is measured and an electronic controller reacts as appropriate to this measurement.
D. The control system is disconnected from the process
7: What is the control circuit used for?
A. To manage switches and displays
B. To route the load circuit
C. To provide a power supply for electronic devices
D. To provide power for logic components only
8: What is a controller?
A. A device that measures or controls quantities such as speed or temperature
B. An electronic device which processes all its inputs within a defined period and sets its outputs accordingly.
C. A device used to start or stop a machine
D. A device which regulates the speed or direction of an object
9: What does the abbreviation "DC" stand for?
A. Data center
B. Direct current
C. District of Columbia
D. Duty cycle
10: What is the main advantage of a direct drive?
A. Direct drives are more expensive than other motor types.
B. Direct drives are less efficient than other motor types.
C. Very high forces can be generated at low speeds.
D. Very high speeds can be generated at low forces
11: How does an electronic brake function?
A. Decreases the speed
B. Applies the brakes
C. Increases the speed
D. Switches a motor to act like a generator
12: What is the purpose of an emergency-stop circuit?
A. To bring a machine into a safe state if a hazard is detected
B. To restart a machine
C. To increase the speed of a machine
D. To turn off a machine
13: What outputs a certain number of pulses after a defined motion?
A. Capacitor
B. Encoder
C. Inductor
D. Transformer
14: What type of interfaces do field buses offer?
A. Parallel
B. Wireless
C. USB
D. Serial
15: What is a frequency converter?
A. An electronic device which is used to provide an adjustment facility for the speed of a three-phase motor.
B. A device which is used to provide an adjustment facility for the speed of a single-phase motor.
C. A device which is used to provide an adjustment facility for the speed of a four-phase motor.
D. A device which is used to provide an adjustment facility for the speed of a two-phase motor.
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Electric Machinery and Drives MCQs
