Oil Hydraulics & Pneumatics(Department Elective - I) — Winter 2019

Draw the symbol of (1) Bi-directional variable displacement pump (2) Pilot operated pressure relief valve (3) 4/3 directional control valve.

List basic electrical devices used in hydraulic system. Explain working of pressure switch with neat sketch.

What are the functions of hydraulic fluids? List different types of hydraulic fluids. Explain high water content fluid with its merits and demerits.

Define following terms referred in filtration: (1) Mesh number (2) Silt index (3) Beta ratio.

List different types of piston pump. Explain stationary cylinder radial piston pump with neat sketch.

Classify actuators. Explain construction and working of double acting linear actuator with neat sketch.

Explain hydrostatic transmission system with neat sketch and list its merits and demerits.

Compare positive displacement pump and non-positive displacement pump.

Compare external gear pump and internal gear pump. Show its operating characteristics.

What are the different types of vane pumps? Explain balanced vane pump with neat sketch.

Draw a circuit for control of single acting spring return hydraulic cylinder.

Explain Hydraulic time delay valve circuit with neat sketch.

Draw and explain a hydraulic circuit for a punching operation using intensifier.

Classify flow control valves.

Draw the neat sketch of check valve and sliding spool 2/2 direction control valve.

What are the functions of hydraulic accumulator? Explain gas filled accumulator with neat sketch.

Classify pressure control valves.

Compare pressure relief valve and unloading valve.

What are the advantages of pilot operated valve over simple valve? Explain pilot operated reducing valve with neat sketch.1

Draw a circuit for operation of unidirectional motor using 3/2 direction control valve.

Explain basic pneumatic system with neat sketch and show all the components on sketch.

Explain working of air pilot control double acting cylinder with circuit diagram.

List advantages and disadvantages of automation in fluid power systems.

Compare pneumatic and hydraulic system.

Draw and explain sequencing circuit to operate two double acting cylinder using limit valves.