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Seat No.: Enrolment
GUJARAT TECHNOLOGICAL UNIVERSITY
DIPLOMA ENGINEERING SEMESTER 6(NEW) • EXAMINATION SUMMER 2018
Subject Code: 3362008 Date: 05-May-2018
Subject Name: Hydraulic And Pneumatic Devices
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make Suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Use of programmable Communication aids are strictly prohibited.
5. Use of only simple calculator is permitted in Mathematics.
6. English version is authentic.
Q.1
Answer any seven out of ten.
14
1.
Define viscosity vapour pressure


2.
Write down the functions of hydraulic accumulator.


3.
What is One way valve? Draw its symbol.


4.
What is FRL unit? Write its need.


5.
What is the function of non-return valve? Draw its symbol.


6.
What is laminar flow turbulent flow?


7.
What is Time delay valve? Draw its symbol.


8.
Give the definition of Hydrostatic Hydrodynamic.


9.
Write Boyle's law Charles's law.


10.
What is hydraulic system? List the basic components of it.


Q.2

Explain balanced vane pump with fig.
03




OR

Explain the Quick exhaust valve with its symbol.
03




Explain two way pilot operated check valve with fig.
03



OR
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Explain Meter-out circuit.
03




Write down advantages limitations of hydraulic system.
04



OR

What is Bernoulli's theorem? Write its limitations assumptions.
04




Write down criteria for selecting a pump.
04



OR

State Prove Pascal's law with fig.
04



Q.3

Explain Radial piston motor with fig.
03
3



OR

What are hydraulic actuators? Explain double acting cylinder.
03




List the types of hydraulic fluids used in hydraulic system discuss it.
03



OR

Explain Air-oil reservoir.
03




Explain hydraulic check unit.
04



OR

What is hydro pneumatic cylinder? Explain.
04




What is Air motor? Explain working of it.
04



OR

Explain speed control circuit.
04



Q.4

Differentiate between seat valve spool valve?
03




OR

Explain Meter-in circuit.
03




Explain compound relief valve with fig.
04



OR

State and Prove continuity equation.
04



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Explain Regenerative circuit write its application.
07



Q.5

What is pneumatic system? Explain Filter, Regulator Lubricator(FRL Unit) with fig.
04





Draw any seven ISO symbols used in hydraulic circuits.
04




Explain telescopic cylinder with neat sketch.
03




Explain spring loaded pressure relief valve with fig.
03