Janardan Rai Nagar Rajasthan Vidyapeeth 2007 Diploma Mechanical Engineering FLUID POWER - Question Paper

DTA2/DTM2 FLUID POWER

Time : 3 hrs Maximum marks : 75

 

Instruction:

1. Question paper is divided into Group A, Group B and Group C

2. Each Group is 25 Marks

3. Figure to the right in bracket indicates marks.

4. Good Handwriting is expected

5. Assume suitable data if necessary.

 

Group A (25 Marks)

 

Answer any three questions (Question 1 is compulsory)

 

Q.1. Define density specific volume, specific weight, specific gravity, coefficient of dynamic viscosity & kinematic viscosity with respect to a fluid. (05)

Q.2. Explain the types of fluids. (10)

Q.3. Explain the construction and working principle of a vane pump (10)

Q.4. Discuss the construction and working of pelton turbine (10)

Q.5. Prove that the centre of pressure of a inclined flat surface lie below the center of

gravity. (10)

Group B (25 Marks)

 

Answer any three questions (Questions 6 is compulsory)

Q.6. An isosceles triangle of base 3m and altitude 6m is immersed vertically in water with its axis of symmetry horizontal as shown in fig. If the head of water on its axis in 9m. Calculate the center of pressure. (5)

Q.7. Derive the equation for loss of head due to sudden enlargement? (10)

Q.8. Explain the types of filters (10)

Q.9. A turbine develop 10000kw under a head of 25 meters at 135 r.p.m. . What is the specific speed? What would be its normal speed and output under a head of 20 meters? (10)

Q.10. A centrifugal pump deliver 120 liter fo water per second against a head of 85m at 9000 r.p.m. Find the specified speed of the pump. What type of impeller would you select for the pump? (10)

Group C (25 Marks)

 

All Questions are Compulsory.

 

Q.11 (A)Fill in the blanks ( each question carry 2 marks)

(i) Center of pressure of a plane surface immersed in a liquid in below the _______ of the plane surface.

(ii) The net head (H) on the turbine is given by H = Gross head - _________________

(iii) O ring is one of the most widely used ________ in hydraulic system.

(iv) Differential manometer are used for measuring_________

(v) Pilot tube in used for measurement of __________

 

 

(B)Multiple choices Question (Each question carries 2 marks)

1. Kinematic viscosity is defined as

a) Dynamic viscosity x density b) dynamic viscosity/density

c) Dynamic viscosity x pressure d) pressure x density

2. The hydrostatic pressure on a plane surface is equal to

a) WAh b) 1/2 wAh

c) 1/4wAh d) 1/3 wAh

3. Pilot tube is used for measuring

a) Pressure b) flow

c) Velocity at a point d) force

4. Hydraulic crane is a practicle application of

a) Pascal Law b) Equation of continuity

c) Bernoullis Equation d) none of the above

5. A turbine is called impulse if at the inlet of the turbine

a) Total energy is only kinetic b) total energy is the sum of K.E and P.E

c) Total energy is only P.E d) None of the above

 

 

(C)True or false (each question carry 1 marks).

(i) U- tube manometer measures actual pressure

(ii) Kaplan turbine is a reaction turbine

(iii) Francis turbine is a radial flow reaction turbine

(iv) Cavitation in turbines increase the efficiency of the turbine

(v) Flow control value controls the pressure

 

 

 

 

 

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