Practice Pakistan's most useful MCQs for competitive exams

A hydraulic ram acts as a/an ______________ pump?

• (A)  Centrifugal
• (B)  Reciprocating
• (C)  Impulse
• (D)  Parallel cylinder

Answer

Submitted By :Ali Uppal

In fluid flow, the stagnation point is defined as a point, where the _____________ is zero?

• (A)  Flow velocity
• (B)  Pressure
• (C)  Total energy
• (D)  All

Answer

Submitted By :Ali Uppal

During ageing of fluid carrying pipes, the__________________?

• (A)  Pipe becomes smoother with use
• (B)  Friction factor increases linearly with time
• (C)  Absolute roughness decreases with time
• (D)  Absolute roughness increases linearly with time

Answer

Submitted By :Ali Uppal

Creeping flow around a sphere is defined, when particle Reynolds number is___________________?

• (A)  < 2100
• (B)  < 0.1
• (C)  > 2.5
• (D)  < 500

Answer

Submitted By :Ali Uppal

A Newtonian liquid (ρ = density, μ = viscosity) is flowing with velocity „v‟ in a tube of diameter ‘D’. Let Δp be the pressure drop across the length ‘L’. For a laminar flow, Δp is proportional to_________________?

• (A)  Lρv2/D
• (B)  LμV/D2
• (C)  Dρv2/L
• (D)  μV/L

Answer

Submitted By :Ali Uppal

An equipotential line is _____________ to the velocity vector at every point?

• (A)  Normal
• (B)  Parallel
• (C)  Tangential
• (D)  None of these

Answer

Submitted By :Ali Uppal

The nominal size of a hose pipe is specified by its _________________?

• (A)  I.D.
• (B)  O.D.
• (C)  Thickness
• (D)  None of these

Answer

Submitted By :Ali Uppal

The equivalent diameter for pressure drop calculation for a fluid flowing through a rectangular cross-section channels having sides ‘x’ & ‘y’ is given by_________________?

• (A)  2xy/(x + y)
• (B)  xy/(x + y)
• (C)  (x + y)/2xy
• (D)  (x + y)/xy

Answer

Submitted By :Ali Uppal

For liquid flow through a packed bed, the superficial velocity as compared to average velocity through the channel in the bed is________________?

• (A)  More
• (B)  Less
• (C)  Equal
• (D)  Independent of porosity

Answer

Submitted By :Ali Uppal

Each term in Bernoulli‟s equation represents the _____________ of the fluid?

• (A)  Energy per unit mass
• (B)  Energy per unit weight
• (C)  Force per unit mass
• (D)  None of these

Answer

Submitted By :Ali Uppal