After you open the modal where you can request answers from other Quora users enter this in the browser console:

document.querySelectorAll(`a[aria-label='Request']`).forEach(el =>{el.click()})

you don't even need to open the console if you add this as bookmark url:

javascript:(function(){document.querySelectorAll(`a[aria-label='Request']`).forEach(el => {el.click()})})()

Then you just have to click your bookmark to send the requests

It works on mobile too, if you search the bookmark from the request page and tap on it.

EDIT : This previous version doesn't seem to work anymore :

new version

document.querySelectorAll(`path[stroke-linecap='round']`).forEach(el => {el.parentElement.parentElement.parentElement.click()})}

new version of the bookmarklet

javascript:(function(){document.querySelectorAll(`path[stroke-linecap='round']`).forEach(el => {el.parentElement.parentElement.parentElement.click()})})()

to select the first 25 request answers. whatever quantity you want clicked, multiple by 2. i<50 is 25 request answer.