Reg. No.
TED (10)-3037
(REVISION-J010)
THIRD SEMESTER DIPLOMA EXAMINATION iN ENGINEERING/
TECHNOLOGY-OCTOBER, 20 1 3
FLI,IID MECHANICS AND PNEUMAflCS
(Common for ME and TD)
lTime
:3
hours
(Maximum marks : 100)
Marks
PART-A
I
2 marks.
Answer a// questions in one or two sentences' Each question carries
Distinguish between density and specific weight.
l.
2.
3.
4.
5.
Define buoYancY'
Name hYdraulic coefficients'
Define specific sPeed of a PumP'
What are actuators
(5x2:10)
?
PAR-I'-B
Ii
Answer any .five questions. Each question carries 6 marks'
l.
2.
3.
State and explain Pascal's law.
with neat sketch'
Explain the working principle of a dead weight pressure gauge
flowing per
Arrive at an expression for the rate of flow or discharge of a fluid
second through a section of a pipe or channel'
5.
Explain hydraulic gradient and total energy line'
of a neat sketch'
Explain the working principle of a gear wheel pump with the help
6.
Describe briefly the
4.
criteria for selection of an air compressor for a particular
use.
Compare any five merits and de-merits of a hydraulic
7.
system.
system and a Pneumatic
(5x6=30)
PART-C
(Answer
one
question from each
unit.
Uxrr
III (a)
(b)
-
Each question carries
l5
marks')
I
liquid and mention
Explain the properties viscosity and kinematic viscosity of a
their units in S'1. system.
for finding out the
Explain total pressure and centre of pressure and the methods
total pressure and centre of pressure'
9
On
13121
Ir.r.o.
Marks
IV (a) Differentiate between absolute, ga.uge, atmospheric and vacuum pressures.
(b) A simple U-tube manorneter containing mercury is connected to a pipe in which
a fluid of specific gravity 0.8 and having vacuum pressure is flowing. The other
end of the manometer is open to atmosphere. Find the vacuum pressure in the
pipe, if the difference of mercury levels in the tw'o limbs is 40 cm and the
height of the fluid in the left limb from the centre of the pipe is 15cm below.
UNrr
-
6
9
II
V (a) Give the classifications of orifices.
(b) Find the discharge over a triangular notch of angle 60o when the head over the
notch is 0.3m. Assume Co : 0.6.
6
9
On
VI (a)
State
ald explain chezy's formula to find out the loss of
a pipe
(b)
friction in
6
Find the diameter of a pipe of length 2000 m when the rate of flow of water
through the pipe is 200 litreslsec and the head lost due to friction is 4m. Take
the value of C : 50 in Chezy's f.ormula.
UNrr
VII (a)
(b)
to
head due
line.
-
9
trII
Briefly describe a Vane pump with the help of a simple sketch.
6
With the help of a neat sketch, describe the working of a hydraulic accumulator. 9
On
VIII (a)
(b)
Name any five pressure control devices for controlling precisely
pressure in a hydraulic system.
the level of
Draw a neat circuit diagram of an automatic cylinder reciprocating
system.
UNrr
D( (a)
(b)
(c)
-
5
IV
Name the essential equipments to be considered in the generation and preparation
of air for industrial purpose.
What is an actuator
?
10
Name the classifications
Differentiate between poppet valve and slide
of a pneumatic
actuator.
valve.
6
6
3
On
'
X (a)
(b)
Briefly explain an air-over oil circuit with a neat circuit
diagram.
Describe a reciprocating piston type air compressor with the help
simple
sketch.
6
of a neat and
9