a)

b)

a)

b)

a)

b)

a)

b)

a)

D1060 Pages: 3

PART B
Answer any three questions, each carries 10 marks
The diameter of an impeller of a centrifugal pump at inlet and outlet are 30cm

and 60cm respectively. Determine the minimum starting speed of the pump if it
works against a head of 30cm.
With neat sketch explain the performance characteristic curves of a centrifugal
pump.
Define the following terms of centrifugal pump

(i) Suction head

(ii) Delivery head

(iii)Static head

(iv)Manometric head.
(i) With neat sketch explain various losses in pumps.
(ii) What is priming and explain the necessity of priming
i) Define ideal indicator diagram.
ii) Show that area of indicator diagram is proportional to the work done by the
reciprocating pump
A single acting reciprocating pump, running at 50 r.p.m delivers 0.01m3/s of
water. The diameter of the piston is 200mm and stroke length 400mm.
determine:

i) The theoretical discharge of the pump.

ii) Co-efficient of discharge

iii) Slip and percentage slip of the pump.
Show from first principle that work saved against friction in the delivery pipe of
a double — acting reciprocating pump, by fitting air vessel is 39.2%.
With neat sketch explain the following

(i) Hydraulic Ram

(ii) Lobe pump

PART C
Answer any four questions, each carries 10 marks

A single acting, single cylinder reciprocating air compressor has a cylinder

diameter of 200mm and a stroke of 300mm. Air enters the cylinder at [एवा
27°C. It is then compressed polytropically to 8 bar according to the law 21735 =
Constant. If the speed of the compressor is 250rpm, calculate (i) the mass of air
compressed per minute and (ii) the power required in KW for driving the
compressor, if mechanical efficiency is 80%. Neglect clearance.

Page 2 of 3

(4)

(6)

(4)

(3)
(3)
(2)
(4)

(4)

(4)

(3)
(3)

(5)