Is this an Active or Passive adapter?

It should be a passive adapter. It doesn't actually convert signals. If I recall, Display Port and DVI are electrically compatible. Don't quote me on that last part.

How long is the cable??

the cable itself is 4" long, not including the connector

Does this support 144hz?

No, you need a DisplayPort to Dual-Link DVI active adapter.

Does this product provides a passive or active output?

This is a passive adapter, as described in the product overview.

Questions & Answers: StarTech DisplayPort to DVI Video Adapter - DP2DVI - Newegg

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StarTech.com DP2DVI DisplayPort To DVI Adapter - Passive - 1080p - DP to DVI - Display Port to DVI-D Adapter

Connect a DVI monitor to a single-mode DisplayPort output from your computer
Works with DisplayPort devices like Elitebook Revolve 810 G3 & Folio 1040 G2
Works with DVI monitors & projectors
Resolutions up to 1920x1200
DisplayPort to DVI adapter / DP to DVI dongle / Display Port to DVI / DisplayPort to DVI-D converter
Connect a DVI display to your DisplayPort computer
Connect your BYOD computer with DisplayPort to a DVI boardroom display

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