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Prefixes and Suffixes MCQ (Questions and Answers) | English Grammer MCQ Question and Answers
Q. 1. Use the correct suffix: There was a green …..light coming from the window.
Q. 2. Use the correct prefix: Power (verb)
Q. 3. Use the correct suffix: Smart (adverb)
Q. 4. Use the correct prefix: Noble
Q. 5. Use the correct prefix: Natural
Q. 6. Select correct suffix to make adjective of the following: Hazard
Q. 7. The word using suffix ‘ment’ is
Q. 8. If you take away the prefix and the suffix, what word is left of the word ‘unemployed’?
Q. 9. What prefix would you add to the root word ‘view’ to indicate that you see something before other people do?
Q. 10. Choose the correct option of prefix to make new word: Continued
Q. 11. Choose the appropriate prefix to make the new word Colon
Q. 12. Choose the appropriate suffix to form new word: Trust
Q. 13. Choose the appropriate prefix to make the new word: Content
Q. 14. Which one of the following can be added to the word “credible” to form a new word?
Q. 15. Use the correct suffix: Neat
Q. 16. Select the correct prefix to make an opposite word of the following- behave
Q. 17. Select the correct prefix to make an opposite word of the following- regular
Q. 18. Using the correct suffix, convert the word ‘moist’ into a noun
Q. 19. Select the appropriate suffix for ‘violin’
Q. 20. Choose the appropriate suffix for new word: Sweet
balancing stands
Balancing Stands: A Comprehensive Guide
Balancing stands have gained prominence in various industries, offering a simple yet effective solution for achieving optimal balancing of rotors. This guide will explore how balancing stands function, their benefits, and their application in diverse rotor mechanisms.
Understanding Balancing Stands
At its core, a balancing stand is designed to facilitate the balancing of different rotary devices, such as fans, pumps, and turbines. These stands typically consist of a flat platform or plate mounted on cylindrical compression springs. The selection of these springs is crucial, as they determine the natural vibration frequency of the platform. Ideally, this frequency should be two to three times lower than the operational frequency of the rotor being balanced.
Components of Balancing Stands
A typical balancing stand includes several essential components:
Plate: The base for mounting the device being balanced.
Cylindrical Springs: Provide the necessary flexibility and allow for natural vibration.
Electric Motor: This motor serves both as a power source and a spindle for mounting the rotor.
Impulse Sensor: This sensor monitors the rotational angle of the rotor, providing necessary data for effective balancing.
With these components, balancing stands create a controlled environment, allowing for precise measurements and adjustments. One notable example of a balancing stand is designed specifically for abrasive wheels, where it demonstrates effective results in balancing performance.
Application in Vacuum Pump Balancing
One of the standout uses of balancing stands is in the balancing of vacuum pumps. The setup mirrors that of other balancing stands but incorporates specific features that improve performance. The vacuum pump is mounted on the stand, with vibration sensors strategically placed to measure vibrations from different sections of the pump.
By utilizing a laser phase angle sensor, operators can synchronize vibration measurements with the rotor’s rotational angle. This capability is crucial for achieving high-quality balancing. For instance, at subcritical speeds, the residual unbalance of the pump rotor meets the stringent demands of the G0.16 tolerance class according to ISO standards. Such precision ensures that the vibration levels remain remarkably low, often not exceeding 0.01 mm/sec.
Balancing Fans with Stands
Balancing stands are not limited to pumps; they are also effective for fans. The design principles remain the same, accommodating various types of fans while maintaining high-quality balancing standards. In one instance, a customer reported achieving a residual vibration level of only 0.8 mm/sec when using a preferred stand, which significantly surpasses the tolerance requirements set for industrial fans under ISO 31350-2007. This tolerance ensures reduced operational noise and improved efficiency.
Moreover, data obtained from a fan manufacturing facility illustrates that using these stands in mass production consistently produces residual vibration that does not exceed 0.1 mm/sec. This level of precision not only meets but often exceeds the required industry standards.
Cost-Effectiveness and Efficiency
One of the key advantages of using balancing stands is their cost-effectiveness. Compared to more complex balancing solutions, these stands require minimal investment yet deliver high-quality performance. Their simplicity ensures that even smaller workshops can afford implementing effective balancing techniques without incurring exorbitant expenses.
Additionally, the efficiency of balancing stands adds to their appeal. The design allows for faster setup, making it easy to switch between different rotors as needed. This flexibility is vital in environments where various types of rotatable devices must be serviced and balanced regularly.
Conclusion
In summary, balancing stands represent a simple yet powerful tool in the field of rotor balancing. Their component structure—featuring a plate resting on cylindrical springs, electric motors, and impulse sensors—enables the achievement of high-quality balancing results for various rotors, whether they are fans, pumps, or other rotary devices. The benefits they offer in terms of cost-effectiveness, efficiency, and precision in balancing make them an indispensable asset across multiple industries.
As industries continue to prioritize operational efficiency and quality control, the adoption of balancing stands is likely to increase. Their ability to meet, and often exceed, industry specifications reinforces their position as a preferred choice for balancing various rotors.
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