HM E5 EXAM QUESTIONS AND ANSWERS GRADED A+ 2026

HM E5 EXAM QUESTIONS AND
ANSWERS GRADED A+ 2026

HM E5: HYDROMECHANICS EXAMINATION
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Instructions: Select the best answer for each question. Each question is worth 1 point.
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Section 1: Fluid Properties & Statics
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1. In a static fluid, the pressure at a given point acts equally in all directions. This is known a
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s:
A) Pascal's Law
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B) Archimedes' Principle
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C) Bernoulli's Principle
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D) Newton's Law of Viscosity
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Correct Answer: A jh jh




2. The specific weight (γ) of a fluid is defined as:
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A) Mass per unit volume (ρ)
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B) Weight per unit volume (ρg)
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C) Density relative to water
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D) Viscosity divided by density
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Correct Answer: B jh jh




3. A U-
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tube manometer is used to measure the pressure difference between two points. If the man
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ometer fluid is mercury (SG = 13.6) and the height difference is 0.1 m, what is the pressure
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difference (in Pa)? (Assume g = 9.81 m/s²) jh jh jh jh jh jh jh




A) 981 Pa
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B) 1,334 Pa
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C) 13,340 Pa
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D) 133,400 Pa
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Correct Answer: C jh jh




(Calculation: ΔP = ρgh = (13.6 * 1000 kg/m³) * 9.81 * 0.1 = 13,341.6 Pa)
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,4. A submerged object will float if:
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A) Its weight is greater than the buoyant force
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B) Its density is greater than the fluid
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C) Its weight is equal to or less than the buoyant force
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D) The pressure at its bottom is less than at its top
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Correct Answer: C jh jh




Section 2: Fluid Kinematics & Dynamics
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5. Which of the following represents the equation of continuity for an incompressible fluid
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flowing through a pipe of varying cross-section?
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A) P₁ + ½ρv₁² = P₂ + ½ρv₂²
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B) A₁v₁ = A₂v₂
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C) P₁V₁ = P₂V₂
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D) τ = μ(du/dy)
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Correct Answer: B jh jh




6. Bernoulli’s equation (P + ½ρv² + ρgz = constant) is derived assuming all of the following
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EXCEPT:
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A) Steady flow
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B) Inviscid fluid (frictionless)
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C) Incompressible flow
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D) Turbulent flow
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Correct Answer: D jh jh




7. In a laminar flow regime (Reynolds Number < 2100), the velocity profile in a circular pip
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A) Uniform (flat)
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B) Parabolic
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C) Turbulent (logarithmic)
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D) Linear jh




Correct Answer: B jh jh

, 8. The Reynolds number (Re) is a dimensionless parameter that represents the ratio of:
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A) Pressure forces to viscous forces
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B) Inertial forces to viscous forces
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C) Viscous forces to gravity forces
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D) Gravity forces to pressure forces
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Correct Answer: B jh jh




Section 3: Flow Measurement & Losses
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9. A Venturi meter is used to measure:
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A) Fluid velocity in a pipe
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B) Flow rate (discharge) in a pipe
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C) Fluid viscosity
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D) Static pressure head
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Correct Answer: B jh jh




10. In the Darcy-
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Weisbach equation for head loss due to friction (h_f = f (L/D) (v²/2g)), the friction factor 'f'
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for turbulent flow in a smooth pipe primarily depends on:
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A) Surface roughness only
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B) Reynolds Number only
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C) Reynolds Number and Relative Roughness
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D) Pipe length and diameter
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Correct Answer: C jh jh




11. Which type of pump is most commonly used for high flow rates and low heads?
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A) Reciprocating Pump
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B) Centrifugal Pump
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C) Gear Pump
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D) Piston Pump
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Correct Answer: B jh jh




Section 4: Dimensional Analysis & Similitude
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12. The Buckingham Pi Theorem is used to:
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A) Determine the velocity of a fluid
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