# maintenance engineering homework help

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• Q1: Q1). DESCRIBE THE PURPOSE OF CABLES THAT USED ON AIRCRAFT? Q2). EXPLAiN THE MAINTENANCE & INSPECTION OF: > SPRINGS. > DRIVE BELTS. > SCREWJACKS. > PUSH PULL RODS. > LEVERS. > V'-BAND CLAMPS, THAT MAY USED ON AIRCRAFT OPERATIONS?See Answer
• Q2:Q1). DESCRIBE THE PURPOSE OF CABLES THAT USED ON AIRCRAFT?See Answer
• Q3:1. The normal time to perform the regular work cycle for a certain manual operation is 3.23 min. In addition, an irregular work element whose normal time is 1:25 min must be performed every 5 cycles. The PFD allowance factor is 15%. Determine (a) the standard time (b) how many work units are produced if the worker's performance in an 8-hour shift is standard. 2. Determine the anticipated amount of time lost per 8-hour shift when an allowance factor of 15% is used, as in the previous question. 3. Now that the standard is set (T= 4.00 min) and given the data from the previous questions how many work units would be produced if the worker's average performance during an 8-hour shift were 125% and the hours worked were exactly 6.956 hour, which corresponds to the 15% allowance factor.See Answer
• Q4:1. The normal time for a repetitive task that produces two work units per cycle is 3.0 min. The plant uses a PFD allowance factor of 15%. Determine (a) the standard time per piece and (b) how many work units are produced in an 8-hour shift at standard performance. 2. The normal time to perform a repetitive manual assembly task is 4.25 min. In addition, an irregular work element whose normal time is 1.75 min must be performed every 8 cycles. Two work units are produced each cycle. The PFD allowance factor is 16%. Determine (a) the standard time per piece and (b) how many work units are produced in an 8-hour shift at standard performance. (c) Determine the anticipated amount of time worked and the amount of time lost per 8-hour shift that corresponds to the PFD allowance factor of 16%. 3. A worker performs a repetitive assembly task at a workbench to assemble products. Each product consists of 25 components. Various hand tools are used in the task. The standard time for the work cycle is 7.45 min, based on using a PFD allowance factor of 15%. If the worker completes 75 product units during an 8-hour shift, determine (a) the number of standard hours accomplished and (b) worker efficiency. (c) If the worker took only one rest break, lasting 13 min, and experienced no other interruptions during the 8 hours of shift time, determine her worker performance.See Answer
• Q5:You have to prepare a training plan for a trainee at the university in the Operation and Maintenance Department in Electricity. Plan for the internship program is given below. A sample report is given, you can check that to see what all to include.See Answer
• Q6:Question A) Deduce the type of failures (either ductile or brittle) for the metals in each image and justify your deduction. B) Discuss how each failure can be monitored via a NDT method. C) How can both types of failure be controlled in the future?See Answer
• Q7:Question Fatigue failure was the root cause of this metal gear failure A) Use the image to confirm this root cause. B) How can fatigue failure in this gear be controlled in the future?See Answer
• Q8:Explain the reason/s for creep failure and how could you prevent this type of failure. Creep failure visual appearance This carbon steel furnace tube should have given good service for ten years. It ruptured after one year. The failed tube showed obvious swelling at the point of rupture. The tube wall was thinned to a knife edge at the rupture.See Answer
• Q9:Question A reformer tube in this reformer has succumbed to creep failure, A) What are some NDT techniques that can be use to monitor creep in the remainder of tubes? B) What are some possible reasons for this failure? TIMESee Answer
• Q10:Question Cavitation has occurred in on a ship's propeller. The ship owner is considering a new in-kind replacement propeller. Advise on a recommendation to control cavitation in the future. Suggest another option to the owner instead of an in-kind replacement. BlakeSee Answer
• Q11:Question The back side of the sliding bearing shown has succumbed to fretting. Recommend ways to control this fretting from occurring in the future. Justify in terms of cost, practicality, and applicability. ASee Answer
• Q12:Question What are some potential causes for spalling that occurred in the inner race of this bearing?See Answer
• Q13:Question • In this image of a valve stem, identify whether the failure has occurred due to distortion or fracture. Justify your answer 02113-1 9 10 11 2 fr HE 4 EMSee Answer
• Q14:Question Hydrogen-induced blistering occurred in a 9.5 mm thick carbon steel plate (ASTM A 285, grade that had been in service one year in a refinery vessel). A) Use the image to confirm this root cause. B) How can hydrogen-induced blistering be controlled in the future? Adapted from ASM Metals Handbook Volume 11See Answer

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