Question

Locate the complete verbal phrase and identify its type.

A boy named Robert won the high jump contest.

Verbal Phrase:

Type:

Answer 1

If you're not sure, just use the system of elimination.
Your options are infinitive, participle, and gerund. 
Let's start with the infinitive - there are no infinitives in this sentence (form TO + verb). Let's continue with gerund - there are no gerunds here either (verb + ing: winning, for example). 
So this means that the correct answer has to be participle. Let's find the participle here - it's the word named. The entire participial/verbal phrase should be named Robert. It is used as an adjective in this example. 

Answer 2

The correct answers are:
Verbal Phrase: named Robert
Type: Participle

Explanation:
Verbal phrases are of three kinds:
1. Participle (verb + ed/ing) -> acts as an adjective or adverb
2. Gerund (verb+ing) -> acts as a noun
3. Infinitive (To + base-form-of-verb) -> acts as a noun, adjective or adverb.

In the sentence, there is neither a gerund nor an infinitive; however, there is a participle "named" in the given sentence. The complete verbal phrase will be "named Robert", which explains the word "boy." Hence, the verbal phrase is "named Robert", and the type is "Participle."