Mechanical Engineering - Strength of Materials - Discussion
Discussion Forum : Strength of Materials - Section 1 (Q.No. 8)
8.
Two shafts 'A' and 'B' transmit the same power. The speed of shaft 'A' is 250 r.p.m. and that of shaft 'B' is 300 r.p.m. The shaft 'B' has the greater diameter.
Discussion:
52 comments Page 5 of 6.
Priya said:
1 decade ago
As speed is inversely proportional to diameter so shaft b has higher speed than its dia must be lower.
OM PRAKASH said:
1 decade ago
(2*pi*n*t)/60 = (2*pi*N*T)/60.
T in the shaft = (pi*tou*d3)/16.
300*d3 = 250*D3.
d3 = (250/300) *D3.
d = 0.94*D.
Then d is smaller than D.
T in the shaft = (pi*tou*d3)/16.
300*d3 = 250*D3.
d3 = (250/300) *D3.
d = 0.94*D.
Then d is smaller than D.
Pravin patel said:
1 decade ago
This mater is depended on shaft diameter but depended on pulley.
Navneet gupta said:
1 decade ago
Equate power of shaft A and shaft B.
On doing this you get Ta = 1.2Tb.
So diameter of B should be smaller.
On doing this you get Ta = 1.2Tb.
So diameter of B should be smaller.
Anil shukla said:
1 decade ago
According to formula Velocity #pi*d*N/60, where d is diameter of shaft, N is speed in rpm. Now N is inversely proportional to 'd'.
Prasenjit De said:
1 decade ago
D is inversely proportional to N.
V = I/60 DN.
= V^1/N.
V = I/60 DN.
= V^1/N.
Sunny said:
1 decade ago
P = TW.
T = PI*DN/60.
D = 1/N.
Diameter is inversely proportional to Rpm.
T = PI*DN/60.
D = 1/N.
Diameter is inversely proportional to Rpm.
Govind.T said:
1 decade ago
There is direct relation.
Power(P) = Torque(t)*Angular velocity(w).
(shear stress(s) = 16t/(3.14*d^3).
(w = 2*3.14*n/60).
= s*pi (3.14)*d^3*2*pi*n/60.
Power is directly proportional to d^3 and r.p.m(n).
To get same power for less r.p.m shaft it should have more diameter.
Power(P) = Torque(t)*Angular velocity(w).
(shear stress(s) = 16t/(3.14*d^3).
(w = 2*3.14*n/60).
= s*pi (3.14)*d^3*2*pi*n/60.
Power is directly proportional to d^3 and r.p.m(n).
To get same power for less r.p.m shaft it should have more diameter.
Daya said:
1 decade ago
Is diameter of shaft is directly proportional to speed?
Vikash said:
1 decade ago
Speed of shaft and its diameter both are inversely depends on so, less diameter have more speed.
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