Fluid Mechanics

JKSSB Junior Engineer (Mechanical) · Technical Subjects (Mechanical) · 29 practice questions with answers and explanations: 18 Easy, 11 Medium, 0 Hard.

Sample questions

Sample Easy question 1

A reciprocating pump is a:

  1. Rotodynamic pump
  2. Velocity pump
  3. Positive displacement pump
  4. Impulse turbine
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Answer: C. It delivers fixed volumes by the motion of a piston or plunger.

Sample Easy question 2

The specific gravity of mercury is about:

  1. 7.8
  2. 0.8
  3. 13.6
  4. 1.0
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Answer: C. Mercury is 13.6 times as dense as water.

Sample Easy question 3

A manometer is used to measure:

  1. Pressure
  2. Density
  3. Velocity
  4. Viscosity
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Answer: A. It balances pressure against a column of liquid.

Sample Medium question 4

The Darcy–Weisbach equation for head loss in a pipe is:

  1. hf = f·L·V² / (2gD)
  2. hf = 4fLV² / g
  3. hf = f·L·V / D
  4. hf = f·D·V² / L
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Answer: A. Head loss grows with length and the square of velocity, and falls with diameter.

Sample Medium question 5

The Mach number is the ratio of:

  1. Flow speed to the speed of sound
  2. Inertia force to viscous force
  3. Pressure to density
  4. Speed of sound to flow speed
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Answer: A. Flow with Mach number above 1 is supersonic.

Sample Medium question 6

Cavitation in a pump or turbine is caused when:

  1. The liquid freezes
  2. The speed is too low
  3. The liquid is too viscous
  4. Local pressure falls below the vapour pressure of the liquid
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Answer: D. Vapour bubbles form and collapse, causing noise, vibration and pitting.

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