# zxing barcode reader java download f nl1 = 6191 Hz in Software Generate PDF417 in Software f nl1 = 6191 Hz

f nl1 = 6191 Hz
Generate PDF 417 In None
Using Barcode drawer for Software Control to generate, create PDF 417 image in Software applications.
Read PDF417 In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
(d) If the swing generator trips off the line, the other three generators would have to supply all 290 MW of the load Therefore, the system frequency will become
Paint PDF-417 2d Barcode In C#
Using Barcode printer for Visual Studio .NET Control to generate, create PDF-417 2d barcode image in .NET framework applications.
Generating PDF 417 In VS .NET
Using Barcode generation for ASP.NET Control to generate, create PDF-417 2d barcode image in ASP.NET applications.
PLOAD = s P1 ( f nl1 f sys ) + s P 2 ( f nl2 f sys ) + s P 3 ( f nl3 f sys ) 290 MW = (34 )(6221 - f sys ) + (34 )(6221 - f sys ) + (34 )(6221 - f sys ) 8529 = 18663 3 f sys f sys = 5937 Hz
Generating PDF417 In .NET
Using Barcode encoder for VS .NET Control to generate, create PDF-417 2d barcode image in .NET framework applications.
Making PDF 417 In Visual Basic .NET
Using Barcode creator for .NET framework Control to generate, create PDF417 image in VS .NET applications.
Each generator will supply 967 MW to the loads 6-8 Suppose that you were an engineer planning a new electric co-generation facility for a plant with excess process steam You have a choice of either two 10 MW turbine-generators or a single 20 MW turbine generator What would be the advantages and disadvantages of each choice SOLUTION A single 20 MW generator will probably be cheaper and more efficient than two 10 MW generators, but if the 20 MW generator goes down all 20 MW of generation would be lost at once If two 10 MW generators are chosen, one of them could go down for maintenance and some power could still be generated
UPC-A Supplement 2 Generator In None
Using Barcode creation for Software Control to generate, create UPC-A Supplement 5 image in Software applications.
Encoding DataMatrix In None
Using Barcode drawer for Software Control to generate, create Data Matrix ECC200 image in Software applications.
7: Induction Motors
Print USS Code 128 In None
Using Barcode generation for Software Control to generate, create USS Code 128 image in Software applications.
European Article Number 13 Generation In None
Using Barcode drawer for Software Control to generate, create European Article Number 13 image in Software applications.
7-1 A dc test is performed on a 460-V -connected 100-hp induction motor If VDC = 21 V and I DC = 72 A, what is the stator resistance R1 Why is this so SOLUTION If this motor s armature is connected in delta, then there will be two phases in parallel with one phase between the lines tested
UCC.EAN - 128 Creator In None
Using Barcode creation for Software Control to generate, create EAN / UCC - 13 image in Software applications.
Bar Code Printer In None
Using Barcode creator for Software Control to generate, create bar code image in Software applications.
VDC R1 R1
Delivery Point Barcode (DPBC) Creator In None
Using Barcode creator for Software Control to generate, create USPS POSTal Numeric Encoding Technique Barcode image in Software applications.
EAN13 Recognizer In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
Therefore, the stator resistance R1 will be
Code 39 Printer In .NET
Using Barcode maker for ASP.NET Control to generate, create Code 39 Extended image in ASP.NET applications.
GTIN - 128 Encoder In None
Using Barcode creator for Microsoft Excel Control to generate, create GS1 128 image in Office Excel applications.
VDC R (R + R1 ) 2 = 1 1 = R1 I DC R1 + (R1 + R1 ) 3
Encode Data Matrix ECC200 In None
Using Barcode generator for Microsoft Excel Control to generate, create ECC200 image in Excel applications.
EAN / UCC - 13 Generation In Objective-C
Using Barcode maker for iPhone Control to generate, create EAN13 image in iPhone applications.
R1 =
Barcode Printer In .NET Framework
Using Barcode generator for Reporting Service Control to generate, create barcode image in Reporting Service applications.
Code 128 Generation In Objective-C
Using Barcode generator for iPad Control to generate, create Code-128 image in iPad applications.
7-2
3 VDC 3 21 V = = 0438 2 I DC 2 72 A
A 220-V three-phase six-pole 50-Hz induction motor is running at a slip of 35 percent Find: (a) The speed of the magnetic fields in revolutions per minute (b) The speed of the rotor in revolutions per minute (c) The slip speed of the rotor (d) The rotor frequency in hertz SOLUTION (a) The speed of the magnetic fields is
nsync =
120 f e 120(50 Hz ) = = 1000 r/min P 6
The speed of the rotor is
nm = (1 s ) nsync = (1 0035)(1000 r/min ) = 965 r/min
(c) The slip speed of the rotor is
nslip = snsync = (0035)(1000 r/min ) = 35 r/min
(d) The rotor frequency is
fr =
7-3
nslip P 120
( 35 r/min )( 6) = 175 Hz
Answer the questions in Problem 7-2 for a 480-V three-phase four-pole 60-Hz induction motor running at a slip of 0025 SOLUTION (a) The speed of the magnetic fields is 114
nsync =
120 f e 120 ( 60 Hz ) = = 1800 r/min P 4
The speed of the rotor is
nm = (1 s ) nsync = (1 0025)(1800 r/min ) = 1755 r/min
(c) The slip speed of the rotor is
nslip = snsync = ( 0025)(1800 r/min ) = 45 r/min
(d) The rotor frequency is
fr =
7-4
nslip P 120
( 45 r/min )( 4) = 15 Hz
A three-phase 60-Hz induction motor runs at 715 r/min at no load and at 670 r/min at full load (a) How many poles does this motor have (b) What is the slip at rated load (c) What is the speed at one-quarter of the rated load (d) What is the rotor s electrical frequency at one-quarter of the rated load
SOLUTION (a) This machine has 10 poles, which produces a synchronous speed of
nsync =
120 f e 120 ( 60 Hz ) = = 720 r/min P 10 720 670 100% = 694% 720
The slip at rated load is
nsync nm nsync
100% =
The motor is operating in the linear region of its torque-speed curve, so the slip at load will be
s = 025(00694) = 00174
The resulting speed is
nm = (1 s ) nsync = (1 00174 )( 720 r/min ) = 707 r/min
(d) The electrical frequency at load is
f r = sf e = ( 00174 )( 60 Hz ) = 104 Hz
7-5 A 50-kW 440-V 50-Hz two-pole induction motor has a slip of 6 percent when operating at full-load conditions At full-load conditions, the friction and windage losses are 520 W, and the core losses are 500 W Find the following values for full-load conditions: (a) The shaft speed nm (b) The output power in watts (c) The load torque load in newton-meters (d) The induced torque ind in newton-meters 115
(e) The rotor frequency in hertz SOLUTION (a) The synchronous speed of this machine is
nsync =
120 f e 120 ( 50 Hz ) = = 3000 r/min P 2
Therefore, the shaft speed is
nm = (1 s ) nsync = (1 006)( 3000 r/min ) = 2820 r/min
(b) (c) The output power in watts is 50 kW (stated in the problem) The load torque is