This simple question is very complex actually, since we have no idea the context of what you are saying. However we can discuss the various means for engines whistle.
An engine could be three things: An engine for a car or an engine as in a train or an engine as in a red indian.
Therefore we could have the sentences "The engine (car) whistles every time I go over 120km" or "The engine (train) whistled when it passed us." or "The engine (red indian) whistled to his friends to attack!"
In the sentences above the word engine is a noun where as the word whistle is a verb.
However if you want to say an engine has a whistle then you would say "engine's whistle." Here its important to attach an apostrophy with a "s" to indicate that the engine possess or owns the whistle.
So a sentence could read, "The engine's whistle is rather loud so stand back!"
The nouns are whistle, start, and practice.
You have to whisper in the library so you won't disturb people who are reading.
The wind blew my coat out of my hands.
I had a thistle stuck in my shoe.
After the team was talking loud, the coach blew the whistle and the team became mute.
Whistle when in doubt
on your paper the boy put down whistle as it's sentence.
I whistle when I'm scared.Sometimes, I whistle but only make a blowing sound.I whistle to keep a good mood.
The referee blew his whistle to signal that there was a penalty.
Whistle
The nouns are whistle, start, and practice.
Joe blew his whistle to stop the game.
Most diesel engines are turbodiesels, and the whistling is the sound of the turbo spooling up as it creates boost.
"when the whistle blew"
The sentence is active. To make it passive, you would write "Lunchtime was announced by the noon whistle."
He liked to whistle as he walked.The whistle signalled the end of the match.
He could hear the faint sound of a whistle coming from a distance.