Mechanical Engineering - Hydraulic Machines - Discussion
Discussion Forum : Hydraulic Machines - Section 1 (Q.No. 1)
1.
Power required to drive a centrifugal pump is directly proportional to __________ of its impeller.
Discussion:
34 comments Page 2 of 4.
Pabitra said:
8 years ago
Fifth power of diameter will be the correct answer.
Jigar k patel said:
8 years ago
Correct Ans is C.
Law 2c Power is proportional to the cube of impeller diameter (assuming constant shaft speed):
{\displaystyle {P_{1} \over P_{2}}={\left({D_{1} \over D_{2}}\right)^{3}}} {P_{1} \over P_{2}}={\left({D_{1} \over D_{2}}\right)^{3}}.
Law 2c Power is proportional to the cube of impeller diameter (assuming constant shaft speed):
{\displaystyle {P_{1} \over P_{2}}={\left({D_{1} \over D_{2}}\right)^{3}}} {P_{1} \over P_{2}}={\left({D_{1} \over D_{2}}\right)^{3}}.
Vinit said:
8 years ago
The Correct answer will be d^5.
Indrajeet said:
8 years ago
According to affinity law of pump.
Power is directly proportional to the fifth Power of diameter.
Power is directly proportional to the fifth Power of diameter.
Dipanjan said:
8 years ago
I agree @Sreeejith.
Sreejith said:
9 years ago
Power is proportional to fifth power of diameter.
Ravi said:
9 years ago
It is 1/4 of the diameter.
Mahi ss said:
9 years ago
The right answer is P proportional to D^5.
(1)
Subrata said:
9 years ago
Not right.
The correct answer Will be d^5.
The correct answer Will be d^5.
Krishan kaushik said:
9 years ago
According to affinity law, discharge is proportional to rpm, head is proportional to the square of the head, &power is proportional to the cube of rpm. On the other hand, discharge is proportional to shaft diameter, head is proportional to the square of diameter & power is proportional to the cube of shaft diameter.
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