EASA Part-66 Cat A, B1, B2, Module 2Descripción completa
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EASA Part 66 Module 4
BEARINGS 1. A lubrication where lubricant is introduced between surfaces which are in rolling contact such as roller gears or rolling bearings? A. Hydrostatic lubrication B. Hydrodynamic lubrication C. Elastohydrodynamic lubrication D. Solid-film lubrication 2. What lubrication is usually used when bearings are operating at extreme temperatures? A. Hydrodynamic lubrication B. Solid-film lubrication C. Hydrostatic lubrication D. Liquid-film lubrication 3. Which of the following is not a form of bearing lubrication? A. Liquid-film lubrication B. Hydrodynamic lubrication C. Hydrostatic lubrication D. Solid-film lubrication 4. In ASTM standard, what is the instrument used in determining viscosity? A. Dynamic viscometer B. Saybolt universal furol C. Hagen-Poinsulle viscometer D. Saybolt universe viscometer 5. In what country that the present theory of hydrodynamic lubrication originates from? A. China B. Germany
C. US D. England 6. In viscosity chart, Raimond-Boyd analysis assumed that the viscosity of the lubricant is _________ A. Constant B. Increasing C. Decreasing D. Vanishing BELTS 7. Find the angle of contact on the small pulley for an open belt drive with a 72 in center distance. The pulley diameters are 6 in and 12 in. Answer: A A. 175.22° B. 170.34° C. 185. 34° D. 165.34° 8. Find the belt length at a 72 in distance connected in open belt. The pulley diameters are 6 and 12 in. Answer: D A. 162.34 in B. 173.45 in C. 123.55 in D. 172.39 in 3. A 6 in diameter pulley turning at 600 rpm is belt connected to ma 12 in diameter pulley. If there is 4% slip, find the speed of the 12 in pulley. Answer: D A. 187 rpm B. 223 rpm C. 203 rpm D. 288 rpm 9. For a given belt a manufacturer gives a horsepower rating of 2.5 hp per inch of width based on a belt speed of 2600 ft/min. The drive is to handle 10 hp and the arc of contact correction factor is 0.90. Find the width of belt needed. Assume that the belt widths are available in 1 inch increments. Answer: B A. 3 in B. 5 in C. 4 in D. 6 in 10. A ¼ in round endless belt connects a 1 in diameter pulley with a 2 in pulley;
spacing between pulleys is 4 in on centers. The allowable stress is 400 psi. If the 1 in pulley is the driver and rotates 100 rpm. How much horsepower can be transmitted? Assume the coefficient of friction to be 0.30 for each pulley. Answer: D A. 0.123 hp B. 1.234 hp C. 0.0115 hp D. 0.0090 hp 11. A 3/8 in flat leather belt is 12 in wide and is used on a 24 in diameter pulley rotating 600 rpm. The specific weight of the belt is 0.035 lb/in3. The angle of contact is 150°. If the coefficient of friction is 0.3 and the allowable stress is 300 psi how much hp can it transmit? Answer: B A. 34.5 hp B. 69.5 hp C. 78.5 hp D. 54.5 hp 12. A 5 mm round belt connects a 20 mm pulley with a 40 mm pulley. The center distance is 150 mm. The 20 mm pulley rotates at 100 rpm and the coefficient of friction of the belt is 0.25. Find the horsepower capacity for this arrangement if the allowable belt stress is 2.6 N/mm2. N/mm2. Answer: C A. 0.12 kw B. 0.23 kw C. 0.00282 kw D. 0.054 kw BRAKES 13. The band brake of a band brake has 210 degrees of contact with its drum. By laboratory tests, it is found found that the pull on the tight side is 800 lbs and the pull on the slack side is 285 lb. What is the coefficient of friction? Answer: A A. 0.281 B. 0.753 C. 0.186 D. 0.453
14. The inertia load on an electric brake is 32 lb-ft2 and the drive shaft is rotating at 2000 rpm. What average torque is required to bring this load to a complete stop in 1.2 sec? Answer: A A. 173.61 ft-lbs B. 153.45 ft-lbs C. 123.45 ft-lbs D. 237.23 ft-lbs 15. The band of a band brake has a contact angle of 180°. It is found experimentally that the pulls on the bands are 275 kg and 100 kg respectively under certain operating conditions. Find the coefficient of friction. Answer: D A. 0.973 B. 0.567 C. 0.197 D. 0.322 16. A brake requires 900 in-lb of torque to stop a shaft operating at 840 rpm in a period of 3.5 seconds. What is the inertial load expressed in lb-ft2? Answer: D A. 90.23 B. 74.34 C. 34.45 D. 96.25 CLUTCH 17. A cone clutch has an angle of 10° and coefficient of friction of 0.42. Find the axial force required if the capacity of the clutch is 7 kw at 500 rpm. The mean diameter of the active conical sections is 300 mm. Answer: C A. 234.45 N B. 186.45 N C. 368.49 N D. 492.45 N 18. How much torque can a cone clutch transmit if the angle of the conical elements is 10 degrees the mean diameter of the conical clutch sections 200 mm and an axial force of 550 N is applied? Assume the coefficient of friction is 0.45. 0.45. Answer: C
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A. 123.23 N-m B. 34.56 N-m C. 142.53 N-m D. 234. 56 N-m If the inertia is 90 lb-ft2 and the speed of the driven shaft is to be increased from 0 to 2500 rpm in 5 seconds, shaft material is of SAE 4140 with yield strength of 110,000 lb/in2, find the clutch starting torque in ft-lb. Answer: C A. 159 B. 128 C. 146 D. 191 Find the frictional radius for a disc clutch. The disc clutch has an outside diameter of 10 in and an inside diameter of 6 in. Answer: B A. 4.54 in B. 4.08 in C. 5.34 in D. 8.44 in In a clutch the outside diameter is 8 in and the inside diameter is 4 in. An axial force of 400 lb is used to hold the two parts together. If the coefficient of friction of the mating materials is 0.4, how much torque can the clutch handle? Answer: B A. 123.45 in-lb B. 497.80 in-lb C. 213.34 in-lb D. 563.23 in-lb A disc clutch has 6 pairs of contracting friction surfaces. The frictional radius is 2 in and the coefficient of friction is 0.3. An axial force of 100 lbs acts on the clutch. The shaft speed is 400 rpm. How much horsepower can the clutch transmit? Answer: A A. 2.28 hp B. 1.23 hp C. 3.23 hp D. 4.23 hp In a band clutch, the ratio of the pull on the tight side of the band to that of the slack side is 4:1. The band contacts the drum for 250 degrees. What is the
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coefficient of friction? Answer: B A. 0.123 B. 0.318 C. 0.234 D. 0.462 A band clutch has an angle of contact of 270° on a 15 in diameter drum. The rotational speed of the drum is 250 rpm and the clutch transmits 8 hp. The band is 1/16 in thick and has a design stress of 5000 psi. How wide should the band be? Assume a coefficient of friction of 0.40. Answer: C A. 2.123 in B. 3.234 in C. 1.014 in D. 4.354 in MACHINE SHOP Determine the time in seconds, to saw a rectangular magnesium bar 5 in wide and 2 in thick if the length of cut is 5 in. The power hacksaw does 120 strokes/min and the feed/stroke is 0.127 mm. Answer: B A. 189 B. 500 C. 99 D. 20 Compute the manual cutting time in minutes, of steel plate 4 ft by 8 ft by 2.5 cm thick with a hand cutting speed of 3.8 to 4 mm/sec, cutting lengthwise Answer: A A. 10 B. 1.81 C. 0.38 D. 8.16 Compute the cutting speed in fpm of a workpiece with 2 inches diameter and running at 100 rpm. Answer: A A. 52 B. 62 C. 25 D. 26 Compute the cutting speed in fpm of a workpiece with 2 inches diameter and turning at 100 rpm. Answer: D A. 72 B. 102 C. 62 D. 52 Calculate the rpm for machining a cast iron workpiece 6 inches in diameter. The lowest cutting speed for cast iron
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is 50 fpm. Answer: C A. 35.3 B. 43.3 C. 33.3 D. 53.32 10. With the arc welding rate of 18 in/min, how long will it take to weld ½ in thick plate by 3 feet long seam? Answer: C A. 3 min B. 1.5 min C. 2 min D. 4 min How long will it take to mill a ¾” by 2” long keyway in a 3” diameter shafting with a 24 tooth cutter turning at 100 rpm and a 0.005” feed/tooth? Answer: B A. 0.136 min B. 0.166 min C. 0.196 min D. 0.106 min How long will it take to saw a rectangular piece of aluminum plate 8 in wide and 1 ½ in thick if the length of the cut is 8 in, the power hacksaw makes 120 rev/min and average feed per stroke is 0.0060 in? Answer: C A. 13.11 B. 14.01 C. 11.11 D. 12.03 Using oxy-acetylene welding method to weld a 3 ft long seam in a 3/8 in thick plate at a consumption rate of 9 ft3/ft of weld for oxygen and 7 ft3/ft for acetylene. What is the total combined gas consumption in ft3? Answer: C A. 51 B. 45 C. 48 D. 55 A grinding wheel rotates 1750 rpm and has a surface speed of 2290 ft/min. Find the diameter of the wheel in inches. Answer: B A. 3 in B. 5 in C. 4 in D. 6 in Two plates 4 ft x 8 ft plate ½ in thick is to be joined lengthwise. A welding machine to be used has a welding rate
of 20 in/min. How long will it take to join the plates? Answer: C A. 7.34 min B. 1.23 min C. 4.80 min D. 6.45 min 37. A 4 ft wide x 8 ft long and ½ in thick steel plate is be cut into 4 equal parts crosswise. If cutting rate is 0.02 in/stroke and saw speed is 110 rpm, how long will it take to do the job? Answer: C A. 53.45 min B. 34.23 min C. 65.45 min D. 67.45 min 38. An oxyacetylene cutter is use to cut a 4 ft x 8 ft steel plate crosswise and divided the whole plate into five equal parts. If the cutting rate is 10 in per minute, how long will it take to cut plates? Answer: A A. 19.20 min B. 13.45 min C. 21.23 min D. 17.34 min 39. A 24 ft2 lateral surface for a cylindrical tank is to be made by joining 2 ft by 2 ft steel plate to form 6 ft x 4 ft. The consumption rate for both oxygen and nitrogen is 20 ft3/ft using oxyacetylene welding method. Find total gas consumption needed, ft3? Answer: D A. 250 ft3 B. 470 ft3 C. 440 ft3 D. 280 ft3 40. A 10 ft x 20 ft plate is to be divided into 8 pieces 5 ft x 5 ft steel plate by means of an oxyacetylene cutter that has a cutting rate of 10 in per minute. How long will it takes to do the job? Answer: C A. 50 min B. 70 min C. 60 min D. 80 min