Hydraulics and Pneumatics

JKSSB Junior Engineer (Mechanical) · Technical Subjects (Mechanical) · 6 practice questions with answers and explanations: 1 Easy, 5 Medium, 0 Hard.

Sample questions

Sample Easy question 1

A hydraulic press works on:

  1. Newton's law of cooling
  2. Pascal's law
  3. Boyle's law
  4. Bernoulli's principle
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Answer: B. Pressure on a small piston produces a large force on a big piston.

Sample Medium question 2

The accumulator in a hydraulic circuit is used to:

  1. Filter the oil
  2. Cool the oil
  3. Store pressurised fluid and smooth out pressure fluctuations
  4. Increase the oil flow
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Answer: C. It acts like a shock absorber.

Sample Medium question 3

In a hydraulic press, the large piston has 10 times the area of the small piston. The force multiplication is:

  1. 10 times
  2. 100 times
  3. 5 times
  4. 1 time
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Answer: A. Force is pressure times area, and pressure is the same on both.

Sample Medium question 4

A pneumatic system uses which working fluid?

  1. Water
  2. Steam
  3. Oil
  4. Compressed air
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Answer: D. Hydraulic systems use oil.

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