A 250
B 325
C 450
D 525
4.71k=(1000-T2)×π×0.6×20060
T2=250N
A N=60,n6=60
B N=60,n6=65
C N=65,n6=60
D N=65,n6=65
n2×n10 = N2
90×40=N2
N=60 rpm=n6
A 960,480,240 rpm
B 540,270,180 rpm
C 240,360,480 rpm
D 180,240,300 rpm
n1=60rpm;n2=120rpm;n3=N=240rpm
n2×n4=n32
120×n4 = 2402
n4=480(rpm)
n1×n5 = n32
60×n5 = 2402
n5=960(rpm)
A 9:1
B 5:1
C 4:1
D 3:1
1202 = 360×n1
n1=40
360:40 = 9:1
A 80rpm
B 160rpm
C 200rpm
D 360rpm
N2=n1×n3
n3 =N2/n1
=1002/50=200(rpm)
A 46kg
B 56kg
C 66kg
D 76kg
2=(1.5T2-T2)×8×175
T2=37.5kg
T1=1.5T2=1.5×37.5=56.25kg
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