Electrical and Fluid Drives and ActuatorsGD GOENKA WORLD INSTITUTEM. Engineering ProgrammeCohort 2011 2015Semester VModule: ENGR312 Electrical and Fluid Drives and Actuators

Assignment of fluid drives M. Marks: 100 Marks Weight: 05 %

1(a) Define the term fluid power. Differentiate between fluid transport and fluid power system.(5 Marks)

1(b) Name five hydraulic applications.(5 Marks)1(c) A pump supplies oil at 0.0016 m3/s to a 40 mm diameter double acting hydraulic cylinder. If the load is 5000 N (extending and retracting) and the rod diameter is 20 mm, find thei. Hydraulic pressure during the extending stroke (10 Marks)ii. Piston velocity during the extending strokeiii. Cylinder power (kW) during the extending strokeiv. Hydraulic pressure during the retracting strokev. Piston velocity during the retracting strokevi. Cylinder power (kW) during the retracting stroke1(d) Define and classify the different types of vales. (5 Marks)

2(a) What is a positive displacement pump? In what ways does it differ from a centrifugal pump? (5 Marks)2(b) A vane pump has a rotor diameter of 50 mm, a cam ring diameter of 75 mm, and a vane width of 50 mm. If the eccentricity is 8 mm, determine the volumetric displacement. (5 Marks)2(c) What is pump cavitation, and what is its cause? (5 Marks)2(d) Explain the principle of an external gear positive displacement pump with neat sketch. (10 Marks)

3(a) What is the difference between a single-acting and a double-acting hydraulic cylinder?(5 Marks)

3(b) Explain the working and construction details of axial-piston type motor with neat sketch?(10 Marks)3(c) What is hydraulic actuator? Explain the working principle of double acting hydraulic cylinder. (10 Marks)

4(a) What is the purpose of pressure control valve? Explain the working principle of spring loaded pressure reducing valve? (15 Marks)4(b) Explain the working principle of Three-Way direction control valves with neat sketch.(10 Marks) ENGR312AssignmentPage 2 of 2