no...its not the clutch plate.....i have changed the clutch plate,pressure plate and clutch bearing a month ago and this problem started after that....well the vibration is increasing slowly with the passage of time but it is not accompanied by any sort of sound....
i guess that the mounts might have been damaged by the mechanic when he was taking off the gear box as he took it off with great difficulty by jolting the whole engine and pulling it out...