SPPU Mechanical Engineering (Semester 7)
Industrial Fluid Power
December 2013
Total marks: --
Total time: --
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Answer any one question from Q1 and Q2
1 (a) Explain the applications of hydraulic system.
8 M
1 (b) Explain different types of filters used in system.
8 M

2 (a) Explain different types of seals used in hydraulic system.
8 M
2 (b) Explain different types of contaminations & their control in hydraulic system.
8 M

Answer any one question from Q3 and Q4
3 (a) Describe the construction and working of balanced Vane Pump.
10 M
3 (b) What are the important factors to be considered for selection of a hydraulic pump for a specific application.
8 M

4 (a) What are the different functions of accumulators. Explain with suitable circuit diagram.
10 M
4 (b) What size of accumulator is necessary to supply 10000 cm3 of oil in a hydraulic system of maximum pressure of 200 bar to 100 bar minimum. Take N2 as gas with precharged pressure of 80 bar. Find isothermal adiabatic condition.
8 M

Answer any one question from Q5 and Q6
5 (a) Compare the different types of speed controlling methods.
8 M
5 (b) Draw symbols for:
i) Double acting Intensifier.
ii) Cooler.
iii) 4/3 tandem centre DCV.
iv) Pressure compensated flow control valve.
v) Gas accumulator.
vi) Time delay valve.
vii) AND valve.
viii) Sequence valve.
8 M

6 (a) Explain the construction and working of a counter balance valve with a neat sketch.
8 M
6 (b) Explain the working of a pilot-operated pressure reducing valve with a application.
8 M

Answer any one question from Q7 and Q8
7 (a) Explain the working of Telescopic cylinder with neat construction.
8 M
7 (b) Draw and explain working of Motor Braking Circuit.
8 M

8 (a) Discuss hydraulic cylinder cushioning with neat sketch.
8 M
8 (b) Analyze the given hydraulic circuit.

8 M

Answer any one question from Q9 and Q10
9 (a) Give the types of dryers and explain any one with neat sketch.
8 M
9 (b) Draw and explain two handed safety circuit.
8 M

10 (a) The machine head of a precision grinder needs to continuously reciprocate over a Cylinder head surface being finished. The speed of the stroke must be controlled in both directions. Draw a Pneumatic circuit for the same.
8 M
10 (b) Explain selection criteria for compressors.
4 M
10 (c) Explain muffler with symbol.
4 M

Answer any one question from Q11 and Q12
11 A pump is delivering high pressure oil to a unidirectional hydraulic motor,which drives external load via rotating shaft. Torque required to drive the load is 170 Nm at 2000 RPM. Design, draw the required circuit and select the components from tables given. Refer the following data.
Pump: ηm=94% Hydraulic Motor: ηm=92%
ηv=92% ηv=90%
Inlet pressure=-0.27 bar Motor Pressure=70 bar

If the motor is 6.1 m above the pump, determine

a. Pump flow rate b. Pump discharge pressure
c. Input power required to drive the pump d. Motor output

Assume head loss takes place when fluid flows from pump to motor as a 5 bar.

18 M

12 A machine slide is moved by means of hydraulic cylinder. The motion of the cylinder is as follows:
a) Initially it moves through a distance of 200 mm against the load of 12 kN in 3 seconds.
b) It is followed by a working stroke of 100 mm against an effective load of 35 kN. The feed rate during this part of the stroke is required to be between 0.5 to 1 m/min.
c) Use regeneration for retraction.
Meter in circuit to be used for speed control.
Draw and design the hydraulic circuit.
Mention the selection requirements of flow control valve, check valve,
pressure relief valve, pump, strainer and reservoir.

Refer from PDF
18 M

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