PurpleToolBox

Been through several airline interviews, some which were technical. Here's the extent of what I've been asked. And no one company asked all of these, just some of these.

Answer in Domestic FAA or FARs criteria, not USAF 11-217 crap.
If you know the answers to these questions, you're good to go for any technical questions -- IN MY EXPERIENCE. Consult your local interview prep.
Be more worried about Tell Me About A Time questions.
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What is the minimum airport facilities required for flight operations?

When do you need a destination alternate?

When is destination weather considered marginal?

When is an additional destination alternate required?

What are the alternate airport IFR weather minimums? (one navaid two navaids)

What are the standard takeoff minimums (2-engine or less, 3 or more engines)

When is a takeoff alternate required?

What are takeoff alternate requirements? (Single-engine; 3 or more engines)

Basic domestic fuel requirements (enough fuel to fly to destination, then most distant alternate, and then 45 minutes of cruise fuel). You *may* see this in a holding question. For example, when do you need to leave holding to land legally at your alternate (ie ... landing with 45 minutes of fuel left) given all types of engine data and time/distance information.

Anything and everything about holding. (what heading would you turn to as you enter holding as depicted), speeds with various altitudes (FAA only, no ICAO) etc.etc.)

Oxygen rules

When would you descend questions ... use 3to1 rule or 3 times your altitude to lose. (need to lose 10,000ft, you need 30 miles).

Airport and runway markings and signage (If I showed you this picture, are you on the active runway or holding short of?)

Jeppensen 10-9 and 10-9A pages . Specifically, what is the minimum weather or equipment required for a specific runway ... hint, its on the 10-9A page.

Max Speed below Class B airspace

Visual Approach Weather Requirements

When are aircraft restricted from the ILS critical area?

Definition of V1, V2, VR, Vmca, Vmcg

Basic aircraft nomenclature ... wing, elevator, fuselage, empennage, ailerons, etc.etc.

Trim tabs move opposite or in same direction as primary flight controls?

Be able to look at IFR maps or sectionals and determine minimal altitudes, etcetc.