Fluid Mechanics and Hydraulic Machinery Miscellaneous
- As per common design practice, the three types of hydraulic turbines, in descending order of flow rate, are
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In descending order of flow rate.
Kaplan > Francis > PeltonCorrect Option: D
In descending order of flow rate.
Kaplan > Francis > Pelton
- In terms of speed of rotation of the impeller N, discharge Q and change in total head H, through the machine, the specific speed for pump is ____
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Ns = N√Q H4/3 Correct Option: C
Ns = N√Q H4/3
- A centrifugal pump running at 500 rpm and at its maximum efficiency is delivering a head of 30 m at a flow rate of 60 liters per minute. If the rpm is changed to 1000, then the head H in meters and flow rate Q in liters per minute at maximum efficiency are estimated to be
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N1 = 500 rpm, H1 = 30 m Q1 = 60l/minute
N2 = 1000 rpm, H2 = ? Q2 = ?Since √H1 = √H2 DN1 DN2 ∴ H2 = 
N2 
² N1 H1 = 1000 ² × 30 = 120 m 500 Q1 = Q2 D³N1 D³N2 ⇒ Q2 = N2 N1 Q1 = 1000 ² × 60 = 120 l/minute 500 Correct Option: B
N1 = 500 rpm, H1 = 30 m Q1 = 60l/minute
N2 = 1000 rpm, H2 = ? Q2 = ?Since √H1 = √H2 DN1 DN2 ∴ H2 = N2 ² N1 H1 = 1000 ² × 30 = 120 m 500 Q1 = Q2 D³N1 D³N2 ⇒ Q2 = N2 N1 Q1 = 1000 ² × 60 = 120 l/minute 500
- Match List-I with List-II and select the correct answer using the codes given below the lists:
List-I
R. Reciprocating pump
Q. Axial flow pump
R. Microhydel plant
S. Backward curved vanes
List-II
1. Plant with power output below 100 kW
2. Plant with power output between 100 kW to 1 MW
3. Positive displacement
4. Draft tube
5. High flow rate, low pressure ratio
6. Centrifugal pump impeller Codes:
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P Q R S
3 5 2 6Correct Option: B
P Q R S
3 5 2 6
