What is the exam pattern and passing mark for GTU Oil Hydraulics and Pneumatics (2171912)?

The GTU theory examination carries 70 total marks with a duration of 2.5 Hours. Minimum passing criteria is 23 marks (33%). The paper consists of 5 main questions with official marking breakdown and internal choices.

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Gujarat Technological UniversitySummer 2025 examination

GTU 2171912 Oil Hydraulics and Pneumatics Summer 2025 Question Paper & PDF

B.E. · Mechanical Engineering · Semester 7 · Subject code 2171912

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Total: 70 marks
To pass: 23 marks (33%)
Duration: 2.5 Hours 2:30 PM – 5:00 PM
Questions: 5 with internal choice

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Q.1

14 Marks

(a)

3 marks

State the basic advantages of hydraulic system over mechanical system.

(b)

4 marks

Draw the symbols of pressure reducing valve & pressure relief valve used in hydraulic system.

(c)

7 marks

Explain working and construction of an internal gear pump with neat sketch.

Q.2

14 Marks

(a)

3 marks

State the Pascal’s law. Explain the principle of Bramah’s press.

(b)

4 marks

What are the functions of hydraulic fluids? List different types of hydraulic fluids.

(c)

7 marks

Classify hydraulic accumulators. Explain any one with schematic diagram.

(c)

7 marks

A double acting hydraulic cylinder is to be operated from two different sources A and B such that its forward motion can be actuated from either of the two locations. Draw and explain a circuit diagram.

Q.3

14 Marks

(a)

3 marks

Explain broad applications of pneumatic system.

(b)

4 marks

Explain why and where Filters are provided to a hydraulic system.

(c)

7 marks

State and explain four main center conditions of 4/3 spool type direction control valve. Draw hydraulic symbols of each position for 4/3 solenoid operated spring centered direction control valve.

(a)

3 marks

Give difference between throttle valve and flow control valve.

(b)

4 marks

State different types of pressure control valves. Explain working of each one with the help of neat sketch.

(c)

7 marks

A pneumatic system is used for punching machining. Design a pneumatic circuit to control a double acting cylinder using 5/2 air-air valve and time delay valve. The piston should extend when two push buttons are pressed simultaneously and automatically retract after fully extended and after specified time delay.

Q.4

14 Marks

(a)

3 marks

Explain different types of fire resistance hydraulic fluid.

(b)

4 marks

Explain construction and working of Quick Exhaust Valve.

(c)

7 marks

What is FRL unit? Explain any one component of FRL unit with schematic diagram.

(a)

3 marks

Explain the following properties of hydraulic fluid.

i)Bulk Modulus

ii)Viscosity

iii)Fire Resistance

(b)

4 marks

Sketch & explain shuttle valve construction & its working.

(c)

7 marks

Sketch the typical fluid reservoir and name the parts, giving their function.

Q.5

14 Marks

(a)

3 marks

Write applications of hydrostatic transmission.

(b)

4 marks

With neat sketch explain construction and working of push button operated spring return 3/2 DCV.

(c)

7 marks

What is pressure compensated flow control valve? How does pressure compensation take place?

(a)

3 marks

What is a check valve? Show various uses of a check valve in the hydraulic circuit.

(b)

4 marks

What do you mean Automation? Give classification of Automation.

(c)

7 marks

Explain the working principle of hydraulic motor. State the types of hydraulic motors. Also discuss the selection criteria for hydraulic motors.

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About this paper

Official Gujarat Technological University (GTU) examination paper for Oil Hydraulics and Pneumatics (Summer 2025, B.E. · Mechanical Engineering, Sem 7). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.

Transcribed for student exam preparation from Gujarat Technological University official examination archives. Questions, syllabus guidelines, and curriculum marking schemes remain the intellectual property of Gujarat Technological University.

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