HPS CAT Quetions

7/28/2019 HPS CAT Quetions

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CMSCE, DEPARTMENT OF MECHANICAL ENGINEERING HYDRAULICS AND PNEUMATIC SYSTEMS

UNIT – I FLUID POWER SYSTEMS AND FUNDAMENTALS

CAT-1

PART – A (3X2=6) Answer THREE questions.

1. What is a Fluid Power System?2. Define Pascal's -Law. What is the function of hydraulic

actuator?3. Define Viscosity.

PART - B (2X12=24) Answer TWO questions.

4. Explain the hydraulic and pneumatic fluid power system.5. What are the desirable properties of hydraulic fluids?

Discuss any eight of them in detail.

CAT-2

PART – A (3X2=6) Answer THREE questions.

1. What are the functions of hydraulic fluid?2. What are the major components of a hydraulic system?3. What is Viscosity Index? What do you infer from VI number

of an oil?


4. (i) How to calculate frictional losses in common valve andfittings.(ii) Define Reynolds number?

5. (i) Differentiate between laminar and turbulent fluid flow(ii) Write short notes on Darcy 's equation

UNIT – II HYDRAULIC SYSTEM AND COMPONENTS

CAT-3PART – A (3X2=6)

Answer THREE questions.1. Define back Pressure.

2. Define Pump. How pumps are classified?3. Write about positive displacement pumps?


4. (a) Write a neat sketch explain the construction and workingprinciple of gear pump.(b) State the procedure used to select hydraulic pump.

5. Explain the following:a. Pump characteristic curvesb. Pump cavitationc. Pump noise


Answer THREE questions.1. Define Gear pump & Vane pump.2. Differentiate between liquid pressure and liquid flow rate?3. What are the factors to be considered for pump selection?


4. (i) Explain with neat sketch, the principle and operation of telescopic cylinder.(ii) With respect to hydraulic motors, define the followingterms:

a. Volumetric efficiency. b. Mechanical efficiency.5. (i) A hydraulic motor has a. displacement of 150 ctn3 and

operates with a pressure of 85 bars and a speed of 1800rpm. The actual flow rate consumed by the motor is 5 Lpsand the actual- torque delivered by the• motor is 185 N-m,find: (1) volumetric efficiency, (2) mechanical efficiency, (3)overall efficiency and (4) kW power delivered by the motor.(ii) Define the terms used to evaluate the performance of hydraulic motor.




UNIT – III DESIGN OF HYDRAULIC CIRCUITS


Answer THREE questions.1. Define Accumulator

2. What are the three basic types of accumulators used inhydraulic systems?3. What are the three basic types of separator type gas loaded

accumulator?


4. (i) With neat sketch describe the construction and operationof pressure regulated flow control valve.(ii) Explain the working of four way two position directioncontrol valve.

5. (i) Briefly explain any two type of accumulators.

(ii) Explain the working of four-way three position controlvalve.


Answer THREE questions.1. What are the most common applications of accumulators in

hydraulic system?2. What are the conditions for the two cylinders to be

synchronized?3. What is the use of Time Delay Valves?


4. (i) Explain air over oil intensifier with suitable example.(ii) With neat sketch Explain the weight loaded accumulator.

5. Design a suitable circuit.(i) Two hydraulic cylinders two work in sequence.(ii) An hydraulic cylinder is used for industrial application. Ithas been decided to use an accumulator as a leakagecompensator. Design a circuit to fulfill these requirements.

UNIT – IV PNEUMATIC SYSTEMS AND COMPONENTS


Answer THREE questions.1. What is the use of bleed-off circuit?

2. What is the use of regenerative circuit?3. What is automatic sequencing circuit?


4. (i) Discuss the working principle of an air compressor.(ii)Discuss the function of the FRL unit.

5. What is the synchronizing? Explain the synchronizing circuitwith suitable approaches?


Answer THREE questions.1. Differentiate between hydraulic and pneumatic systems?2. What is a fast exhaust valve?3. What is the use of compressor?


4. (i) Draw the neat sketch of the pneumatic filter and explainits construction and working. Also give the graphical symbol.(ii) Develop a continuous single cylinder reciprocation circuitfor pneumatic system using limit switches and relays

5. Design an electro hydraulic circuit for the followingsequences A+B+A-B- where A & B stand for cylinder (+)indicates extension and (-) indicates retraction of cylinders.Incorporate provision for auto-manual selector andemergency stop.




UNIT – V DESIGN OF PNEUMATIC CIRCUITS

CAT-9PART – A ( 3X2=6)

Answer THREE questions.1. What is ladder diagram?2. What is the advantage of using micro electronic control for

fluid power compared to electro mechanical control?3. What is fluidics?

PART-B (2X12=24) Answer TWO questions.

4. (i) What are the factors considered during the installation of pneumatic system.(ii) What are advantages of using fluidics system?

5. Three pneumatic cylinders A, B, C are used in an automaticsequence of operation. A cylinder extends, B cylinder

retracts C cylinder retracts and then A cylinder retracts Ccylinder extends and B cylinder extends Develop pneumaticcircuits by cascade method Sketch also travel step diagramand briefly explain.

CAT-10PART – A ( 3X2=6)

Answer THREE questions.1. Name the common methods used for designing logic

circuits?2. What is the difference between pressure switch and

temperature switch?3. What is an electric relay?

PART-B (2X12=24) Answer TWO questions.

4. (i) Explain the working principle of a PLC with neat blockdiagram.(ii) How does a PLC differ from microprocessor?

5. How PLC is used in fluid power control? Explain with asuitable application.

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