91
Transition from laminar flow to turbulent flow is aided by the
A)
Surface roughness and curvature (i.e.sharp corners)
B)
Vibration
C)
Pressure gradient and the compressibility of the flowing medium
D)
All of the above
Answer & Solution
Answer: Option
D
92
Capillary tube method of viscosity measurement is based on the
A)
Hagen-Poiseulle's equation
B)
Stoke's law
C)
Navier-stokes equation
D)
None of these
Answer & Solution
Answer: Option
A
93
In power law, $$\zeta = {\text{A}}{\left( {\frac{{{\text{du}}}}{{{\text{dy}}}}} \right)^2} + {\text{B,}}$$ then the fluid is
A)
Newtonian
B)
Dilatant
C)
Thixotropic
D)
Rheopectic
Answer & Solution
Answer: Option
A
94
In deriving Bernoulli's equation, fluid is assumed to be
A)
Incompressible, frictionless, steady, along a streamline
B)
Uniform, steady, incompressible, along a streamline
C)
Steady, density being pressure dependent, frictionless
D)
None of these
Answer & Solution
Answer: Option
A
95
$$\frac{{{{\text{C}}_{\text{p}}}}}{{{{\text{C}}_{\text{v}}}}}$$ is termed as
A)
Adiabatic constant
B)
Mach number
C)
Weber number
D)
Prandtl number
Answer & Solution
Answer: Option
A
96
The equivalent diameter for flow through a rectangular duct of width B and height H is
A)
$$\frac{{{\text{HB}}}}{{2\left( {{\text{H}} + {\text{B}}} \right)}}$$
B)
$$\frac{{{\text{HB}}}}{{{\text{H}} + {\text{B}}}}$$
C)
$$\frac{{2{\text{HB}}}}{{{\text{H}} + {\text{B}}}}$$
D)
$$\frac{{4{\text{HB}}}}{{{\text{H}} + {\text{B}}}}$$
Answer & Solution
Answer: Option
C
97
As the velocity V and thus the Reynolds number of a flow past a sphere increases from very low value, the drag force for Re << 1
A)
Increases linearly with V
B)
Decreases linearly with V
C)
Decreases as V2
D)
None of these
Answer & Solution
Answer: Option
A
98
Delivery of insufficient quantity of liquid by a pump may be caused by
A)
Air leak in the inlet
B)
Low rpm
C)
Too high a lift
D)
All of the above
Answer & Solution
Answer: Option
D
99
Design of the casing of centrifugal pump should be such as to minimise the
A)
Back flow through impeller
B)
Loss of kinetic head
C)
Loss of static head
D)
None of these
Answer & Solution
Answer: Option
B
100
A lubricant 100 times more viscous than water would have a viscosity (in Pa.s)
A)
0.01
B)
0.1
C)
1
D)
10
Answer & Solution
Answer: Option
B
