Second year, Department of Aeronautical Engineering
First and second
Units Questions.
Answer ALL Questions PART- A [10 Marks]
- Define Newton’s
law of viscosity?
- Define specific
weight?
- What is meant by
stagnation pressure?
- Differentiate
between dynamic viscosity and kinematic viscosity?
- What is
venturimeter? and explain its basic principles?
- What are energy
lines and hydraulic gradient lines?
- What is meant by
laminar boundary layer?
- Define energy
thickness?
- What is the use of
moody’s diagram?
- What do you mean
by flow through parallel pipes?
1.
a) Calculate the specific weight. Mass
density, specific gravity and specific volume of oil having a volume of 4.5m3and
weight 40KN. (3)
b) Two large plane surface of 2.5cm a
part. The space between the surfaces is filled with glycerin. What force is required to trag a very thin
plate of surface area 0.5m2 between the two large surfaces at a speed of 0.6m/s. If
i.
The
thin plate is in the middle of two plane surfaces.
ii.
The
thin plate is such a distance of 0.8cm from one of the surfaces
Take the dynamic viscosity of glycerin
8.1×10-1 N s/m2. (10)
2.
a)
Calculate the capillary effect in mm glass of tube of 4mm diameter when
immersed in i) Water, ii) Mercury. The
temperature of liquid is 200c and the value of the surface tension
of water is 0.073575 N/m and the surface tension of mercury is 0.51 N/m
respectively. The angle of contact for water is 00 and the angle of
contact for mercury is 1300 Take the density of water at 200c=
998 kg/m3 .The specific gravity of mercury is 13.6. (8)
b) A simple U tube manometer
containing mercury connected to a pipe in which a fluid of specific gravity 0.8
and having vacuum pressure is flowing. The other ends of the manometer open to
the atmosphere. Find the vacuum pressure of the pipe. If the difference of the
mercury level in the two limb 40cm the high of the fluid in the left limb from
the centre of the pipe is 15cm below. (5)
3.
a)
i) Water flows through a pipe AB 1.2m diameter at 3m/s and then passes through
a pipe BC 1.5m diameter at C the pipe branches into CD in 0.8m diameter and carries
1/3 of the flow in AB the flow velocity in branch CE is 2.5 m/s .Find the
volume rate of flow in AB , velocity in BC, the velocity in CD and the diameter
of CE. (8)
ii) The water is flowing through
a pipe having diameter 20cm and 10cm at section 1 and 2 respectively .The rate
of flow through a pipe is 35 litre/sec . The section one is 6m above datum and
section 2 is 4m above datum. If the pressure of section 1 is 39.24 N/cm2.
Find the intensity of pressure at section 2.
(5)
4.
a)
A smooth pipe of diameter 80mm and 800m long carries water at the rate of 0.480
m3/min. Calculate the loss of head valve shearing stress and centre
line velocity take kinematic viscosity of water as 0.015 stroke the value of
coefficient of friction from the relation given as F=0.0791/(Re)1/4. (8)
b) An horizontal venturimeter consist
of 30cm diameter at inlet section and 15cm diameter and throat section the
reading of differential manometer connected to the inlet and throat is 20cm of
mercury. Determine the rate of flow. (5)
5.
The
difference in water surface level in two
tanks which are connected by three pipe in serious of length 300mm, 170m and
210m and of diameter 300mm,200mm and 400mm respectively is 12m .Determine the
rate of flow of water if coefficient of friction are 0.005, 0.0052,0.0048
respectively.1)Considering minor loss, 2) Neglecting minor loss. (13)
PART - C [15
Marks]
6.
a)
Derive the continuity equation of differential form. (5)
b) Derive the Euler’s equation of
motion and deduce the expression to Bernoulli’s equation. (10)
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