What is viscosity index number?
What is a pressure compensated pump?
Draw the graphical symbol of three position four way solenoid energised spring return direction control
valve.
How linear actuators are classified?
State the uses of synchronization of circuits.
What is the operating pressure range in the pneumatic systems?
When are the lubricators necessary in pneumatic systems?
Write the advantages of air motor.
What is low cost automation?
Compare PLC and a computer on the basis of fluid power applications
State the importance of viscosity in a hydraulic circuit and what happens if the viscosity is too high.
Define mechanical efficiency of a pump.
What is cylinder cushioning?
What is a check valve?
State the purpose of synchronization of cylinder motion.
Draw the symbol of three positions, four way closed center solenoid operated direction control valve.
What is the range of pressures used in pneumatic applications?
State the role of limit switch in a pneumatic circuit.
What is a relay coil?
What is power pack?
1. State and explain the types of fluid power control systems with its advantages.
(ii) What are fluids used in the hydraulic systems. State the essential characteristics of them.
2. (i) Explain the principle of any one of the positive displacement pump with a neat sketch.
(ii) Discuss the factors to be considered in selection of a pump for automobiles lift.
3. (i) A hydraulic motor has a volumetric displacement of 123 cm³ operating at a pressure of 60
bar and speed 1800 rpm. If the actual flow rate consumed by the motor is 0.004 m³/sec. and the
actual torque delivered by the motor is 100 Nm. Calculate i) Volumetric Efficiency ii) Mechanical
Efficiency iii) Overall Efficiency
ii) Explain with a neat sketch of four way, two position direction control valve with symbolic
representation.
4. (i) Discuss the working principle of double acting cylinder with a neat diagram.
(ii) Explain the operational features of a pressure sequence valve with a neat sketch.
5. (i) With a suitable diagram, explain double pump hydraulic systems.
(ii) Explain with a simple circuits, how the speed of the actuator is controlled in hydraulic
systems?
6. (i) Explain the working of hydraulic punch-press using a pressure intensifier with a circuit.
(ii) Draw a basic hydraulic circuit with accumulator used as a leakage compensator
7. a) (i) Discuss the construction and function of the following pneumatic elements.
i) AND type shuttle valve
ii) Quick exhaust valve
(ii) Write a note on muffler.
8. Two pneumatic cylinders A and B are used in an automatic sequence of operation. A cylinder
extends, B cylinder extends, and then A cylinder retracts, B cylinder retracts.
9. Develop a pneumatic circuit by cascade method.
10. i) Explain the various types of pneumatic switching elements with simple sketch.
(ii) Draw the ladder diagrams for cylinder sequencing using PLC.
11. Develop an electro-pneumatic circuit for the sequence A+B+A-B-. Provide an auto/manual
selector module.
(i) Name the hydraulic liquids used in hydraulic system and discuss their properties.
12. (i) Name the hydraulic liquids used in hydraulic system and discuss their properties.
(ii) Describe the working of a swash plate piston pump with a diagram. Derive an expression for
the theoretical discharge of the pump.
