Mechanical Engineering Exam > Mechanical Engineering Questions > Gauge pressure at a point is equal toa)absolu...
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Gauge pressure at a point is equal to
- a)absolute pressure plus atmospheric pressure
- b)absolute pressure minus atmospheric pressure
- c)vacuum pressure plus absolute pressure
- d)vacuum pressure minus absolute pressure
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Gauge pressure at a point is equal toa)absolute pressure plus atmosphe...
∴ Gauge pressure = Absolute minus atmospheric pressure
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Gauge pressure at a point is equal toa)absolute pressure plus atmosphe...
Gauge Pressure
Gauge pressure is a type of pressure measurement that is relative to atmospheric pressure. It is the pressure measured above or below atmospheric pressure at a given point. In other words, it is the difference between the absolute pressure and the atmospheric pressure at that point.
Explanation of the Options
Let's go through each option to determine the correct answer:
a) Absolute pressure plus atmospheric pressure:
This option suggests that the gauge pressure is equal to the sum of the absolute pressure and the atmospheric pressure. However, this is incorrect because gauge pressure is the difference between the two, not the sum.
b) Absolute pressure minus atmospheric pressure:
This option correctly states that the gauge pressure is equal to the difference between the absolute pressure and the atmospheric pressure. This is the correct answer because the gauge pressure is measured relative to atmospheric pressure.
c) Vacuum pressure plus absolute pressure:
This option suggests that the gauge pressure is equal to the sum of the vacuum pressure and the absolute pressure. However, vacuum pressure is typically negative and represents a pressure lower than atmospheric pressure. Adding the two pressures together would not give an accurate representation of the gauge pressure.
d) Vacuum pressure minus absolute pressure:
This option suggests that the gauge pressure is equal to the difference between the vacuum pressure and the absolute pressure. However, vacuum pressure is typically negative and represents a pressure lower than atmospheric pressure. Subtracting the two pressures would not give an accurate representation of the gauge pressure.
Conclusion
Based on the explanations above, option 'b' is correct. The gauge pressure at a point is equal to the absolute pressure minus the atmospheric pressure. This allows for a relative measurement of pressure at that point, taking into account the atmospheric pressure as a reference.
Gauge pressure is a type of pressure measurement that is relative to atmospheric pressure. It is the pressure measured above or below atmospheric pressure at a given point. In other words, it is the difference between the absolute pressure and the atmospheric pressure at that point.
Explanation of the Options
Let's go through each option to determine the correct answer:
a) Absolute pressure plus atmospheric pressure:
This option suggests that the gauge pressure is equal to the sum of the absolute pressure and the atmospheric pressure. However, this is incorrect because gauge pressure is the difference between the two, not the sum.
b) Absolute pressure minus atmospheric pressure:
This option correctly states that the gauge pressure is equal to the difference between the absolute pressure and the atmospheric pressure. This is the correct answer because the gauge pressure is measured relative to atmospheric pressure.
c) Vacuum pressure plus absolute pressure:
This option suggests that the gauge pressure is equal to the sum of the vacuum pressure and the absolute pressure. However, vacuum pressure is typically negative and represents a pressure lower than atmospheric pressure. Adding the two pressures together would not give an accurate representation of the gauge pressure.
d) Vacuum pressure minus absolute pressure:
This option suggests that the gauge pressure is equal to the difference between the vacuum pressure and the absolute pressure. However, vacuum pressure is typically negative and represents a pressure lower than atmospheric pressure. Subtracting the two pressures would not give an accurate representation of the gauge pressure.
Conclusion
Based on the explanations above, option 'b' is correct. The gauge pressure at a point is equal to the absolute pressure minus the atmospheric pressure. This allows for a relative measurement of pressure at that point, taking into account the atmospheric pressure as a reference.
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