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EP 110 This is your first attempt for this question. Problem Statement The performance characteristics of a centrifugal pump are shown below. The 20 cm diameter impeller is installed. With the same impeller, what pump speed is required if an application needs a head of 36 m and a flow of 3800 L/min? What is the required net positive suction head at this speed? What brake horsepower (in kW) is required at the new conditions? Let the density of water be 998 kg/m³. 10 1750 rpm Water (20°C) 35 cm 60 30 cm 25 cm 50 20 cm 40 Head 20 50 3 w) HSdN 10 NPSH, 1000 2000 3000 4000 5000 6000 Flow (L/min) 7000 8000 9000 10000 Answer Table Description Value Pump speed (rpm) NPSH (m) Brake horsepower (kW)
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R1 MMM R3 MMM L a R2 A bar of length d = 0.8 m is free to slide without friction on horizontal rails as shown in Figure. A uniform magnetic field B = 1.6 T is directed into the plane of the figure. Left ends of the rails are connected to a circuit composed of resistances R1 = 25 Ω, R2 = 10 Ω, and R3 = 10 Ω, a solenoid with inductance L = 0.5 H, a battery with emf ε = 120 V, and a switch S. The bar has mass m = 100 g and resistance R = 5 Ω. Ignore all other resistance in the circuit due to connecting wires and the rails. Just after the switch is closed, what is the acceleration of the bar?Question 4
S208.0
Xo = 2.22 m (launch distance of A)
Yo = 11.1 m (ejection height of A)
MA = 3.79 kg (mass of package A)
MB = 44.4 kg (mass of weight B)
Msled = 1.76 kg (mass of sled)
SYc = 1.00 m (height of car)
Ve = 121 km/h (speed of car)
μ = 0.213 (coefficient of friction between sled and launch bed)
Xc = 2.00 m (length of car)
Xo
Ds + D
B
: Yo
0
IX
Vc
- Ye
launch. 1 = SxoInnoienoT-| Question Text | EP 110
This is your first attempt for this question.
Problem Statement
The performance characteristics of a centrifugal pump are shown below. The 20 cm diameter impeller is installed. With the same impeller, what pump speed is required if an application needs a head of 36 m and a flow of 3800 L/min? What is the required net positive suction head at this speed? What brake horsepower (in kW) is required at the new conditions? Let the density of water be 998 kg/m³.
10
1750 rpm Water (20°C)
35 cm 60 30 cm
25 cm 50 20 cm
40
Head
20
50 3 w) HSdN
10
NPSH,
1000
2000
3000
4000 5000 6000 Flow (L/min)
7000
8000
9000
10000
Answer Table
Description Value Pump speed (rpm) NPSH (m) Brake horsepower (kW) |
| Topic | All topics |
| Subject | Physics |
| Class | Class 11 |
