Q.1 Attempt any four of the following:
(i) List and write in short about any 5 desired properties of hydraulic oils in fluid power.
(ii) List any 5 energy losses encountered by a flowing fluid in a fluid power system.
(iii) Draw and label a schematic sketch of an internal gear pump.
(iv) Draw a schematic sketch of double acting cylinder with labeling of at-least 5 parts in it
(v) A pump has a displacement of 100 cm3, it delivers 0.0015 m3/s at 1000 rpm and 70 bar. If the prime mover input torque is 120 N-m, find the:-
(a.) Overall efficiency of the pump (b.) Theoretical torque required to operate the pump
Q.2 Attempt any two of the following:
(i) A hydraulic motor has an 82 cm3 volumetric displacement, if it has a pressure rating of 70 bar and it receives oil from a 0.0006 m3/s pump, find the motor’s:-
(a.) Speed (b.) Torque capacity (c.) Power capacity
(ii) What is a cylinder cushion and its purpose? Explain with the help of a neat diagram.
(iii) Explain the working of a screw pump with the help of a neat and labeled sketch.
Q. 3 For the system as shown below, find the Force to be developed by the cylinder to drive a load of 1000 N and also find out the required diameter of the piston during extension, if the pressure rating of the cylinder is 20 bar.
