6. With reference to a centrifugal compressor: A□ In the case of an impeller outflow angle beta" <90°, a vaneless diffuser is usually adopted BThe diffuser is always bladed, in order to increase the compression work C□ In the case of an impeller outflow angle beta">90°, a vaneless diffuser is usually adopted D□ None of the others

6. With reference to a centrifugal compressor: A□ In the case of an impeller outflow angle beta" <90°, a vaneless diffuser is usually adopted BThe diffuser is always bladed, in order to increase the compression work C□ In the case of an impeller outflow angle beta">90°, a vaneless diffuser is usually adopted D□ None of the others

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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5.16. For a centrifugal compressor rotating at 2500 rpm, find the compression ratio for the following specifications. T = 300 K; 79 (volumetric flow rate)=1.25 m³/s and t (the thickness of the flow section at the exit) = 0.15 m. = 0.85; r, = 0.55; ra = 0.015; B, 60°,
1(C) A centrifugal pump has an impeller of diameter (D) of 300mm. When pumping 20°C water at a fixed rotational speed of 1500 RPM, the measured flow rate Q and pressure rise Pare given by the manufacturer as follows: Flow Rate (L/s) 13 19 25 32 38 44 Pressure Rise (Bar) 2.5 2.4 2.35 2.2 2.0 1.6 It is desired to use the same pump, running at 945 RPM, to pump 20°C water at 22L/s. According to your dimensionless correlation, what pressure rise p is expected?
A single-stage centrifugal pump having a suction pipe 254 mm in diameter anda discharge pipe diameter of 5 inches is being tested and found out to discharge 48 lps ofwater. A pressure gage connected to the inlet pipe reads 118 mm Hg vacuum and adischarge gage reads 150 kPa at a distance 100 cm above the point where the inletpressure was measured. If the kW rating of the driving motor is 12 kW, calculate: a) the pump efficiency. b) if this pump runs at 1800 rpm, what will be the new discharge rate,head, and power developed if the pump speed was increased to 3600 rpm? Assumeconstant efficiency. c) Determine the pump type.
Uz な、以う0 Vrz VF = Vz Ure Maxe Dr. Ayser Muneer Turbomachines Example (5-2) An inward flow reaction turbine is supplied with water at a rate of (600 Vsec) with a 3 velocity of flow of (2 m/sec). the velocity of periphery and velocity of whirl at inlet are 24 m/sec and 18 m/sec respectively. Assuming radial discharge at outlet and the velocity of flow to be constant, find; 1- Vane angle at inlet, and 2- Head of water on the wheel. V Solution Vn Q = 0.6 m/sec, Vn=2m/sec, uj=24 m/sec, Vu=18m/sec, V1=Vr2 m/sec
5.16.| For a centrifugal compressor rotating at 2500 rpm, find the compression ratio for the following specifications. T = 300 K; nst (volumetric flow rate) = 1.25 m/s and t (the thickness of the flow section at the = 0.85; r, = 0.55; ra = 0.015; B, 60°, exit) =0.15 m.
The discharge through pump is 0.04 cu. m per sec and velocity of flow is constant and equal tp 2m/s. The internal and external diameter of an impeller of a centrifugal pump are 200 mm and 400 mm, respectively, which is running at 1000rpm. The diameters of the suction and delivery pipes are 140 mm and 90 mm respectively and suction and delivery heads are 6m (abs.) and 30m (abs.) of water respectively. If the outlet vane angle is 45 deg and power required to drive the pump is 16 kW, determine: (a) vane angle of the impeller at inlet, (b) the overall efficiency of the pump, and (c) manometric efficiency of the pump.
The inlet of a centrifugal pump is 7 ft above a water surface level. The reentrant inlet (KIN = 1) includes 12 ft of 2 in. pipe (k, = 0.0002 ft) and contains one long sweep elbow (Kel = 0.41). The 2 in. outlet line discharges to the atmosphere and contains two long sweep elbows and one check valve (Kcv = 2.1) in its 200 ft length. The discharge is 20 ft above the original water surface. Given the attached pump curve, determine the flow of water at 70°F (u = 1.059 x 10-5 ft²/s). 120 110 100 90 80 70 60 50 40 30 20 10 10 20 30 40 50 60 70 80 90 100 DISCHARGE, IN GALLONS PER MINUTE HEAD, IN FEET
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3. A 90% efficient Francis turbine running at 100 rpm discharges 6m * 3/s of water. The inner runner radius is 1.8 m and the outer periphery of the wheel has a radius of 2.5 m. The blade height is 50 cm. The blade angle beta_{1} is 80 degrees and beta_{2} is 160 degrees Find the vane angle, torque, and the power from the turbine
a. Calculate the mass flow rate in lb/min. b. Calculate the speed at section 2 in ft/min or fpm
Two centrifugal pumps, each capable of delivering a flow rate of 100 m³/h at ahead of 50 meters, are used in a water distribution system. If these pumps are operated inparallel, what is the expected combined performance of the system under idealconditions?A. A flow rate of 100 m³/h at a head of 100 meters.B. A flow rate of 200 m³/h at a head of 50 meters.C. A flow rate of 200 m³/h at a head of 100 meters.D. A flow rate of 100 m³/h at a head of 25 meters.
A centrifugal pump is used to lift water from a water reservoir with level 2 m below the pump center line. Then, to another reservoir with level 6 m above the center line. Pressure gages readings from the suction and discharge are 1 bar and 4 bars respectively. The flow rate at O.68 m3/s with pipe inside diameters of 400 mm at suction and 250 mm at the discharge. Assume over all head loss due to friction of 4 J/N, what is the discharge head in meter?