"What is the difference between single plate clutch and multi plate clutch?"
At the clutch plate and the pressure plate.
You can buy an alignment tool that centers the clutch disc. If you buy a complete clutch kit with the clutch, pressure plate and throwout bearing there should be a plastic one with it. If just changing the disc, get it in place and start all the bolts holding the pressure plate on. Tighten them till the pressure plate just touches the clutch disc. The disc should be the same diameter as the pressure plate or just slightly smaller. Feel around the edge of the pressure plate till you have it centered. Tighten the bolts holding the pressure plate and finish putting the transmission in. This is usually close enough to allow the transmission to bolt up. Even with an alignment tool, you should do this because the tool doesn't hold the clutch disc exactly centered.
Clutch, yes. Pressure plate, No.
the clutch plate ,pressure plate and throwout bearing should cost around 110.00 labour will vary its about a 2 hour job for a garage or about 4 hours in your driveway
The air gap between frictional surfaces of the clutch plate and clutch rotor should be 0.40-0.50mm (0.015-0.020").
Broken clutch cable or clutch pressure plate fork.
The springs around the clutch plate have probably came out and locked up between the pressure plate and the clutch plate and locked them together. you need to change the clutch plate and have the pressure plate checked for damage.
a pressure plate works by springs. when disengaged the tension is released from the springs which hold the clutch plate against the flywheel,allowing the clutch plate to spin free,which basically stops the transfer of power from engine to gearbox when clutch is engaged the tension is reapplied to springs in pressure plate forcing the clutch plate against the flywheel
The clutch will have to be replaced. The pressure plate could possibly be resurfaced but usually it is as cost effective to replace the pressure plate.
clutch plate,pressure plate,throwout bearing
A clutch pressure plate is used to clamp the disc to the flywheel and transfers the power to the transmission.