{
    "_id" : ObjectId(someId),
    sourceId: someId,
    "objArr" : [
        {
            "fieldA" : someValue,
            "fieldB" : someValue
        },
        {
            "fieldA" : someValue,
            "fieldB" : someValue
        },
        ...etc
    ]
}

db.coll.find(
    {
        "sourceId": sourceId,
        "objArr": {
            "$elemMatch": {
                "fieldA": { "$lte": 3 },
                "fieldB": { "$gte": 5 }
            }
        }
    },
    { "$objArr.$": 1 }
)

db.coll.aggregate([
    { "$match": { "sourceId": sourceId } },
    { "$project": {
        "objArr": {
            "$filter": {
                "input": "$objArr",
                "in": "ob",
                "cond": {
                    "$and": [
                        { "$lte": [ "$$obj.fieldA", 3 ] },
                        { "$gte": [ "$$obj.fieldB", 5 ] },
                    ]
                }
            }
        }
    }}
])

db.collect.aggregate([
    { "$match": { "sourceId": sourceId } },
    { "$project": {
        "objArr": {
            "$setDifference": [
                { "$map": {
                    "input": "$objArr",
                    "as": "obj",
                    "in": {
                        "$cond":  [
                            { "$and": [
                                { "$lte": [ "$$obj.fieldA", 3 ] },
                                { "$gte": [ "$$obj.fieldB", 5 ] },
                            },
                            "$$obj",
                            false
                        ]
                    }
                },
                [ false ]
            ]
        }
    }}
])

db.table.aggregate([
  {$match:{_id:1}},
  {$unwind:"$coll"},
  {$match:{"coll.fieldA":{$gt:10},"coll.fieldB":{$lt:20}}},
  {$project:{"fieldA":"$coll.fieldA","fieldB":"$coll.fieldB"}}
])