Reference no: EM13905156
1. A centrifugal pump has the following characteristics
|
Q (m'/min)
|
0
|
7
|
14
|
21
|
28
|
35
|
42
|
49
|
56
|
|
H (m)
|
40.0
|
40.6
|
40.4
|
39.3
|
38
|
33.6
|
25.6
|
14.5
|
0
|
|
11 CA)
|
0
|
41
|
60
|
74
|
83
|
83
|
74
|
51
|
0
|
This pump is used to pump water from one reservoir to another through a pipe of length 125 m, diameter 40 cm, and friction factor 0.0054. The difference in height of the water levels in the reservoirs is 20 m. Neglecting separation losses,
(i) Find the flow rate and head delivered by the pump.
(ii) Find the power supplied by the motor driving the pump
2. A centrifugal pump recorded the following performance for pump tests run at l500rev/tnin.
|
Water flow, Oh
|
0,075
|
0,150
|
0,200
|
0,250
|
0,300
|
|
Head, m
|
70
|
68
|
64
|
53
|
49
|
|
Input power, kW
|
97
|
127
|
147
|
163
|
170
|
|
|
The pump was lrnown to perform well at the high heads and low flow rates required with a previous application. The pump is now to be uscd with much lower head conditions and higher flow-rates. The user is concerned about power consumption and efficiency. When used to pump water at these new conditions the centre-line of the pump is 4m vertically above the lower waterreservoir and 30 vertically below the upper water level ro which it pumps. The piping used has f= 0,006, is 0,3m internal diameter throughout and is of length 20m and 200m on the suction and delivery sides respectively.
Using graphical means, determine the delivery flow rate and head of the pump at its rated speed of 1500r/min
what speed the pump should operate at to keep the power just below 200 kW and what the overall efficiency is at this speed.
|
Show the given situation on an s - r diagram
: You may invest in any one, or in any combination of them. The mean rate of return r is the same for each asset, but the variances are different. Show the situation on an s - r diagram. Describe the efficient set.
|
|
Must the contract be in writing to be enforceable
: ABC company hired Andrew as its research director. The terms of the employment contract is five years. As ABC knows at the moment of signing, Andrew is terminally ill when the contract is created, and is not expected to live more than nine months. Mu..
|
|
Estimate the cost of the inventory destroyed
: 1. Kauai Store's inventory is destroyed by a fire on September 5, 2013. The following data for year 2013 are available from the accounting records. Estimate the cost of the inventory destroyed.
|
|
Depreciation method and internal controls
: What is Honda Motor Co., Ltd overarching accounting principles; i.e., revenue recognition method, depreciation method and internal controls?
|
|
Find the flow rate and head delivered by the pump
: This pump is used to pump water from one reservoir to another through a pipe of length 125 m, diameter 40 cm, and friction factor 0.0054. The difference in height of the water levels in the reservoirs is 20 m. Neglecting separation losses, Find th..
|
|
Optimal combination of products to get the maximum profit
: The company manufactures two types of product A and B made of plastic. The company received 3,000 lbs recycled plastic of product A and 10,800 lbs recycled plastic of product B. The company also receives industrial plastic of 24,000 lbs per month. De..
|
|
Label the variables as independent-dependent-intervening
: The manager of Haines Company observes that the morale of employees in her company is low. She thinks that if their working conditions are improved, pay scales raised, and the vacation benefits made attractive, the morale will be boosted. List and la..
|
|
Which company should include any unsold goods
: Which company should include any unsold goods as part of its inventory?
|
|
Suspicious subject is clarified verbal discussion sufficient
: When the initial encounter with a suspicious subject is clarified by a verbal discussion sufficient to end the officer’s suspicion that criminal activity might have been about to occur, the officer may make a pat-down of the subject’s outer garments,..
|