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Taken from the Lexicanum
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Imperators are employed most of the time as vast mobile fortresses to strengthen vulnerable sectors of the battlefront or to act as a reserve force behind the front-line. When a major offensive begins, Imperator Titans spearhead massive assaults of men and machines, their terrifying firepower blasting a path through enemy lines.
A complete company of infantry plus supporting troops can be housed on board the Imperator to guard it against infantry assault or be transported to a vital objective.
The Imperator is configured to deliver salvos of devastation at all ranges, the fire intensifying as the Imperator closes with its target. However, Imperators are not normally equipped to fight other Titans in close combat. Instead they rely on their deadly firepower to cripple opponents before they get too close.3
According to the scale diagram from the Imperator's Apocalypse datasheet, it stands approximately 39" tall on tabletop, equivalent to 55.5 meters (166ft) in real life.
Dies Irae,2 the famous Chaos Imperator Titan that laid siege to the Imperial Palace, was stated as being 43m (130ft) tall, though it is by no means clear that Dies Irae had cathedral spires, serving as it was during the time of the Imperial Truth.