Antecedent question

[Freeguy]

The primary mechanical feature of a turbine is a rotatable element- called the runner, rotor, or wheel- that is mounted on a shaft and has a series of vanes, blades, or buckets arranged around [it's] periphery. When the moving fluid strikes the blades or buckets, the energy of the fluid is transferred to the wheel, causing rotation of the wheel and the turbine shaft.


The word "its" refers to ..... .
1- shaft2- element3- turbine4- feature

 

[bhaisahab]

The primary mechanical feature of a turbine is a rotatable element- called the runner, rotor, or wheel- that is mounted on a shaft and has a series of vanes, blades, or buckets arranged around [it's] periphery. When the moving fluid strikes the blades or buckets, the energy of the fluid is transferred to the wheel, causing rotation of the wheel and the turbine shaft.


The word "its" refers to ..... .
1- shaft2- element3- turbine4- feature

The rotatable element.

 

[Freeguy]

I agree with you. However, the answer key says it is shaft. I don't get the reason.

 

[bhaisahab]

I agree with you. However, the answer key says it is shaft. I don't get the reason.

Nor do I.

 

[Tdol]

I don't either.

 

[emsr2d2]

The primary mechanical feature of a turbine is a rotatable element- called the runner, rotor, or wheel- that is mounted on a shaft and has a series of vanes, blades, or buckets arranged around [it's] periphery. When the moving fluid strikes the blades or buckets, the energy of the fluid is transferred to the wheel, causing rotation of the wheel and the turbine shaft.


The word "its" refers to ..... .
1- shaft2- element3- turbine4- feature

It would only refer to "shaft" if it said "... a rotatable element - called the runner, rotor, or wheel - that is mounted on a shaft which​ has a series of vanes, blades or buckets arranged around its periphery."

 

[SoothingDave]

I work for a company that makes turbines. Trust me, the blades are on the wheel (rotating element) which is on the shaft. The blades are not on the shaft.

 

[Freeguy]

I agree with all of you. I'm a Mechanical Engineering as well. The claim of the answer key doesn't make any sense. Please look at the another question made up from this context I have previously posted.

According to the passage, the runner of turbine ...... .
1- stops the fluid from moving2- causes the wheel to rotate3- uses its buckets to move the fluid4- is attached to the turbine shaft

Answer key says it must be 2. However, I go for 4.Because according to the text we have : runner = rotor= wheel. So how can the RUNNER causes itself(wheel) to rotate.( I'm questioning the accuracy of option 2. Besides, we have this sentence in the text : " ....or wheel- that is mounted on a shaft = is attached to the turbine shaft " ( preferring option 4)