Q1: Starting friction is low in case of the __________ lubrication.

ANS:C - hydrostatic

Hydrostatic lubrication occurs when the lubricant is supplied under pressure to the surfaces that need to be lubricated. The pressure of the lubricant creates a thick, continuous film between the moving surfaces, preventing direct contact and minimizing friction and wear. Key points about hydrostatic lubrication:

1. Pressure-driven lubrication: In hydrostatic lubrication, the lubricant is forced into the bearing or contact area under pressure. This pressure can be generated by external pumps or by the weight of the lubricant itself in certain applications.
2. Thick lubricant film: The pressure of the lubricant ensures that a thick film of lubricant is maintained between the moving surfaces at all times. This film acts as a barrier, preventing metal-to-metal contact and reducing friction.
3. High load capacity: Because of the continuous lubricant film and the support provided by the pressure, hydrostatic lubrication systems can handle high loads without significant wear or damage to the surfaces.
4. Applications: Hydrostatic lubrication is commonly used in heavy machinery, large bearings, hydraulic systems, and other applications where high loads, slow speeds, or extreme operating conditions are present.
5. Controlled lubricant flow: The pressure of the lubricant can be precisely controlled in hydrostatic lubrication systems, allowing for tailored lubrication according to the specific requirements of the application.