Question

If the Hausner’s ratio is between 1.50 to 1.61, then the powders exhibit

• A. Very poor flow
• B. Fair passable flow
• C. Excellent flow
• D. Very very poor flow

Hint:

Hausner's ratio is used to predict the flow characteristics of powders. Ratios between 1.50 and 1.61 suggest fair passable flow.

Answer 1

The Correct Option is B

Hausner's ratio (tapped density divided by bulk density) is used as a quick indicator of powder flow behavior, with higher ratios generally indicating more cohesive, poorer-flowing powders. In the classification scheme used for this question, a Hausner ratio between 1.50 and 1.61 places the powder in the fair passable flow category, meaning the powder is somewhat cohesive but can still be made to flow with moderate effort (such as vibration or agitation), rather than flowing freely on its own.

Therefore, the correct answer is Fair passable flow.

Answer 2

Another way to approach this is to think about where 1.50-1.61 sits relative to the two ends of the Hausner ratio scale used in this question's classification.

1. Very poor flow: This label would apply to a range positioned even further from the free-flowing end of the scale than 1.50-1.61 is, in the scheme being used here.
2. Fair passable flow: Sitting in the middle portion of the scale, moderately elevated but not extreme, the 1.50-1.61 range fits the fair passable flow description used in this question.
3. Excellent flow: This sits at the opposite, low end of the Hausner ratio scale, so it clearly does not correspond to values as high as 1.50-1.61.
4. Very very poor flow: This would represent an even more elevated range than 1.50-1.61, at the far cohesive end of the scale used here.

Positioning 1.50-1.61 within the overall scale confirms it falls under the fair passable flow classification used in this question.

Therefore, the correct answer is Fair passable flow.