I think the question needs rewording.
In English, a consonant, vowel, consonant sequence creates a short vowel.
Take my name: Sam
to make the vowel long, we add the silent "e" to the end
Sam becomes Same
Silent "e" makes the preceding vowel say it's name
To elongate a vowel differently we use the consonants r and w
fat becomes fart (for example)
The first A has a long A sound and the second is a schwa.
Diesel does have a long "E" sound, so yes. Generally in long vowel words with two vowels together, the long vowel sound represents the first letter of the vowel pair, not the second, for example "died," where the long vowel sound is "I" So "diesel" is unusual, since the long vowel sound represents the second vowel "E"
The first E is long, but the second is unstressed (schwa).
The first E is long, but the second is unstressed (schwa).
The first "i" in ignite has a short vowel sound. The second "i" in ignite has a long vowel sound.
The long vowel in "stomachache" is the 'a' sound in "ache."
Yes, the word "volcano" has a long o vowel sound, as in "vo-l-cano".
The word "class" has a short vowel sound. The letter "a" in this word is pronounced as /æ/.
in-SPIRE-rer the first vowel is short, the second vowel is long, and the third vowel is hardly pronounced.
The first E has a long E vowel sound, the second is a schwa.
The EA pair has a long E vowel sound. The second E is silent.
First syllable long, second syllable short