13.For prod magnetization ASTM E709, per 25 mm (1 in.) of prod spacing for mater
ID: 2305275 • Letter: 1
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13.For prod magnetization ASTM E709, per 25 mm (1 in.) of prod spacing for material 19 mm (3/4 in.) and over in thickness, recommends a magnetizing current of 1. 90 2. 90 to 110 3. 100 to 120 4. 90 to 100 14. Suppose the shaft is 100 cm long and 10 cm in diameter and is to be magnetized in a coil having 5 turns. Calculate the amperage to be applied to magnetic particles test according the ASTM E 709 formulas: 0) For parts with a substantial length/diameter ratio such as the shaft, shown in Fig.42, the formula is: It 35 000/I(L/D)+2] (i) For parts with an L/D ratio less than 4 but not less than 2 the formula is: It 45 000 (L/D) t number of turns in the coil l-current in amperes where: length of part D - diameter of part It - amp turns the numbers 35000 and 45000 are empirically derived Constants 15. A standard calibration test for the yoke must be able to lift (on AC): 1. 2.5 kg 2. 3 Kg 3. 18 kg 4. No of the above 16.When Concentration of magnetic particles in a liquid vehicle is measured using a 100 ml pear shaped tube.The recommended concentration is: 1. For fluorescent particles the generally recommended concentration is from 0.1 to 0.4 2. For fluorescent particles the generally recommended concentration is from 0.2 to 0.6 3. For fluorescent particles the generally recommended concentration is from 0.1 to 0.3 4. For fluorescent particles the generally recommended concentration is from 0.1 to 0.4 ml per 100 mL. For non-fluorescent particles it is from 1.2 to 2.4 mL per 100 mL mL per 100 mL. For non-fluorescent particles it is from 1.5 to 2.6 mL per 100 mL mL per 100 mL. For non-fluorescent particles it is from 1.2 to 2.4 mL per 100 mL ml per 100 mL. For non-fluorescent particles it is from 1 to 4 ml per 100 mlExplanation / Answer
13. when using prods on material 3/4 in.(19mm) in thickness or more it is recommended to use 100 to 120 A current per inch.
14.Since for the given shaft L/D=10>4 we will be using equation(i) to calculate required current.
Here t=5 and L/D=10. Hence
I*5=35000/[10+2]
which gives I=583.33 A
15. A standard calibration test for the yoke must be able to lift 4.56kg on AC. Thus the answer is (4)none of the above.
16.The recommended concentration is from .1 to .4 mL per 100 mL for fluorescent particles and for non-fluorescent particles the recommended concentration is 1.2 to 2.4 mL per 100 mL.
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