Test: Hydraulic Pump - 2


10 Questions MCQ Test Topicwise Question Bank for Mechanical Engineering | Test: Hydraulic Pump - 2


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QUESTION: 1

If two pumps identical in all respects and each capable of delivering a discharge Q against a head H are connected in series, the resulting discharge is

Solution:

QUESTION: 2

Cavitation parameter a defined in terms of NPSH (net positive suction head) and net head H as, σ =

Solution:
QUESTION: 3

In a pump installation the local atmospheric pressure is 10 m of water, vapour pressure head is 0.4 m (abs), height of the pump above sump water level is 5 m. For a head loss in the suction side of 0.6 m, the NPSH is

Solution:


Zs = elevation of pump above the liquid surface in the sump. If the pump is set below the liquid level in the sump then Zs would be negative.

QUESTION: 4

Water is to be lifted by a net head of 184 m. Identical pumps with specific speed of 30 and rotative of 1500 rpm capable of discharging 200 L/s are available. The number of pumps required is [Take 1843/4 = 50]

Solution:


∴ Q = 1000 L/s
Number of pumps = 1000/200 = 5

QUESTION: 5

Water is pumped through a pipeline to a hieght of 10 m at the rate of 0.1 m3/s. Frictional and other minor losses are 5 m. Pumping power required, in kW is

Solution:

Total manometric head,
H = 10 + 5 = 15 m
Pumping power,
P = g Q H = 9:81 x 0.1 x 15
= 14.715 kW

QUESTION: 6

In a reciprocating pump without air vessel, the friction head in the delivery pipe is maximum at the crank angle θ =

Solution:


hfs is maximum at 

QUESTION: 7

The indicator diagram of a reciprocating pump is a plot of

Solution:
QUESTION: 8

Actual indicator diagram for a single stage "reciprocating pump is represented by

Solution:
QUESTION: 9

An air vessel in the delivery side of a reciprocating pump

Solution:

Function ofair vessel fitted on delivery side:
(i) Almost constant delivery discharge is obtained.
(ii) Reduction in friction loss and hence saving in power.

QUESTION: 10

Which one of the following is not a positive displacement pump?

Solution:


Note that centrifugal pump is not positive displacement pump. It is a rotodynamic or dynamic pressure pump.

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