5 a)
b)
6 a)
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7 ஐ
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8 a)
b)
9
10 ஐ
b)
11 ஐ

02000ME206052001

PART ‏تا‎

Answer any three questions, each carries 10 marks
State the differences between a radial flow turbine and a rotodynamic pump.
Write short note on ‘multi stage centrifugal pumps’.
What do you mean by NPSH?
Derive an expression for the minimum starting speed of a centrifugal pump.
Find the number of pumps required to take water from a deep well under a total
head of 89 m. All pumps are identical and running at 800 rpm. The specific
speed of each pump is given as 25 while the rated capacity of each pump is 0.16
20
Distinguish between rotodynamic pump and positive displacement pump.
The diameter and stroke of a single acting reciprocating pump are 200 mm and
400 mm respectively. The pump runs at 60 rpm and lifts 12 litres of water per
second through a height of 25 m. The delivery pipe is 20 m long and 150 mm in
diameter. Find the theoretical power required to run the pump, percentage of
slip and acceleration head at the beginning and middle of the delivery stroke.
With a neat diagram illustrate the working of ‘hydraulic accumulator’.

Illustrate the working of ‘jet pump’.

PART C

Answer any four questions, each carries 10 marks
A single acting reciprocating air compressor delivers air at 7.5 bar. The pressure
and temperature at the end of suction stroke are | bar and 25°C. It delivers 2.2
ന of free air when running at 310 rpm. The clearance volume is 5% of stroke
volume. The pressure and temperature of ambient air are 1.03 bar and 20°C. If
the compression follows Pv! = © and expansion follows एप =C determine
the volumetric efficiency of the compressor, diameter and stoke of the cylinder
if both are equal, indicated power and brake power if the mechanical efficiency
is 85%.
With the help of neat diagrams illustrate the working of a multi stage
reciprocating air compressor. List the advantages of multi stage compression
over single stage compression.
Define and derive volumetric efficiency of a reciprocating compressor in terms
of clearance ratio.

Derive the relation between suction pressure, intermediate pressure and delivery

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