Fluid-mechanics Questions Set 70:
The theoretical power needed to power a reciprocating pump is
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A grinding wheel of 150 mm diameter is rotating at 3000 rpm. The grinding speed is
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Which one of the following pumps is NOT a positive displacement pump?
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What is the need of an air vessel used in a reciprocating pump?
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A centrifugal pump lifts 0.0125 m3 /s of water from a well with a static lift of 30m. If the brake power of the driving electric motor is 5 kW, what is the overall efficiency of the pump set?
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The component fitted in the suction and delivery pipe to maintain the uniform velocity of flow of liquid n single acting reciprocating pump is
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A single-acting two-stage air compressor deals with 5 m3 /min of air at 1.023 bar and 15°C with a speed of 250 rpm. The delivery pressure is 80 bar. If the inter-cooling is complete, the intermittent pressure after the first stage will be.
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Consider the following statements regarding reciprocating pump:
- Frictional losses are maximum at the middle of the stroke
- The maximum inertia effect occurs in a place with zero frictional losses
- A negative slip may occur when the delivery head is high.
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Two identical pumps, both with the same discharge (Q) and both working against the same head (H). Which of the following statements is true if they are connected in parallel?
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In a water supply system, the service pump must maintain a net static head lift of 5 m at the tank to which it delivers freely via a 4 km long pipe, where all minor losses can be ignored. The pipe has a diameter of 0.2m and a friction factor of 0.01. The pumped water is discharged at a rate of 2 meters per second. The pump's absolute pressure differential is nearly zero (taking atmospheric pressure as 10.3 m of water)
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