Answer: Pump efficiency = 0.585 = 58.5%
Explanation: Pump efficiency = (power gained by the fluid)/(power supplied by the shaft)
Power gained by the fluid = Q(ΔP) + m(((v2)^2) - ((v1)^2))/2
Where Q = volumetric flow rate = 10 ft3/s = 0.283 m3/s
ΔP = 1.2 psia = 8273.709 Pa
m = mass flow rate = density × volumetric flow rate
Density = 62.4 lbm/ft3 = 999.52 kg/m3
m = 999.52 × 0.283 = 282.86 kg/s
v2 = 5ft/s = 1.524 m/s
v1 = 2ft/s = 0.61 m/s
Q(ΔP) = 0.283 × 8273.709 = 2341.46 W
Power from change in kinetic energy = m(((v2)^2) - ((v1)^2))/2 = 275.92 W
Power gained by the fluid = 2341.46 + 275.92 = 2617.38 W
Power supplied by shaft = 6hp = 6 × 746 = 4476 W
Efficiency = 2617.38/4476 = 0.58475 = 0.585 to 3s.f
QED!
Answer:
a) 93.852 kN
b) 128.043 mm
Explanation:
Stress is load over section:
σ = P / A
If plastic deformation begins with a stress of 297 MPa, the maximum load before plastic deformation will be:
P = σ * A
316 mm^2 = 3.16*10^-4
P = 297*10^6 * 3.16*10^-4 = 93852 N = 93.852 kN
The stiffness of the specimen is:
k = E * A / l
k = 113*10^9 * 3.16*10^-4 / 0.128 = 279 MN/m
Hooke's law:
x' = x0 * (1 + P/k)
x' = 0.128 * (1 + 93.852*10^3 / 279*10^6) = 0.128043 m = 128.043 mm
Answer:
b)false
Explanation:
Rolling is a process in which work piece passes through rolls to produce desired out put of the work piece.Rolling is a metal forming process.
We know that friction force is responsible for motion of work piece between rolls.If friction force is so small at the entrance side then work piece will not enter in the forming zone and forming process will not occurs.So the friction force should be high at the entrance side and low at the exit side.
So given statement is wrong.
Answer:
This is a function written in Python Programming Language to check whether a given number is prime or not.
def is_prime(n):
if (n==1):
return False
elif (n==2):
return True;
else:
for x in range(2,n):
if(n % x==0):
return False
return True
print(is_prime(9))
Explanation:
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