10

11

12

13

14

b)

a)

b)

a)
b)

a)
b)

a)

b)

a)
b)

D1060 Pages:

Prove that the work done per Kg of air in a compressor is given by
n
W= RT, = [0;) 7-೩ -1] where (ர) = pressure ratio.

A single stage reciprocating air compressor is compressing 2kg of air per minute
at 1 bar 20°C and it delivers it at 7 bar. Assuming compression process follows

the law PV+* = Constant. Calculate indicated power input to compressor, neglect

clearance.

Prove that for complete inter - cooling between two stages, the compression work
would be minimum when intermediate pressure p, = 421 = ‏و5‎ ` ೫ ‏وم‎ Where ற, and
93 भार suction and delivery pressure respectively.

State how are the air compressors classified?

Describe with a neat sketch the construction and working of a single-stage,
single-acting reciprocating air compressor?

With neat sketch explain surging and chocking

Explain the methods to improve the isothermal efficiency of an air compressor
“Air at a temperature of 305°K flows in a centrifugal compressor running at
16000 rpm. Isentropic efficiency of the compressor is 80%. Outer diameter of the
blade tip is 600mm. Take slip factor as 0.85. Calculate

(i) The temperature rise of air passing through the compressor

(11) The static pressure ratio.

Derive the expression for width of impeller blade for centrifugal compressor
With neat sketch explain the construction and working of a vane compressor
Discuss the merits and demerits of a centrifugal compressor over axial flow

compressor.

ಸಸ್ಯ मर नर

Page 3 of 3

(5)

(5)

(4)
(6)

(5)
(5)
(6)

(4)
(4)
(6)