JohnMcMahonMaintenanceandReliability

(b) A special sprinkler system is comprised of three identical humidity sensors, a digital controller, and a pump, of which the reliability is 0.916, 0.965, and 0.983 respectively. The system configuration is shown in the figure below. Sensor Controller Pump Reliability block diagram of a sprinkler system. (b) Calculate the reliability of the sprinkler system. (c) Discuss the importance of safety in an engineering maintenance.

(a) A very important component of a system has a mean time between failures of 100 hr and a mean time to repair of 10 hr. Determine the inherent availability of the system.           (b) If the equipment in Q7 (c i) above is required to meet an inherent availability requirement of 0.985 and a mean time between failures of 100 hr. Calculate the permissible mean time to repair and if the system as a mean of the time intervals between corrective maintenance actions of 900 hrs and the sum of the mean corrective maintenance time intervals including supply downtime and administrative down time of 10 hrs Determine the operational availability of the system

DEPARTMENT OF MECHANICAL ENGINEERINGMENG 303 PRINCIPLES OF COMPUTER AIDED ENGINEERING Failure mode and effect analysis for Autonomous underwater vehicles, based on any standard.   plese dont late

Based on the Ball Point Pen Factory simulation: Which of the barriers shown below is positioned correctly? Great 10 9 Difficulty of removal 3 B 2 7 6 5 す 4 3 2 1 5 small 0 0 1 2 small 3 4 5 6 7 8 9 10 Impact on cycle time and quality great Barrier 1 Barrier 2 Barrier 3 Barrier 4 Barrier 5 Legend: 1 External supply - poor quality parts 2 Worker idle and non-productive time 3 Unnecessary supply forms within factory 4 Factory lighting 5 Transparent order management

With the following maintenance type, design weaknesses are redesigned to improve reliability or maintainability Select one: O a. Predictive maintenance O b. Corrective Maintenance O C. Preventive maintenance O d. Scheduled maintenance

00 T R %24 Bb R V qa du/webapps/assessment/take/launch.jsp?course_assessment_id%=_254968_1&course_id%3D 3565256_1&content id= 52826 * Question Completion Status: Attach File Browse Local Files Browse Content Collection QUESTION 2 A company needs to choose one supplier for a particular type of silicon wafer used'in the production of semiconductors. The company has three options. Supplier A sells the silicon wafers for $2.50 per wafer, independently of the number of wafers ordered. Supplier B sells the wafers for $2.40 each but does not consider an order for less than 2,000 wafers. Supplier C sells the wafers for $2.30 each but does not accept an order for less than 3,000 wafers. Assume an order setup cost of $100 and an annual requirement of 20,000 wafers. Assume a 20% annual interest rate for holding cost calculations. a. Which supplier should be chosen to minimize the total annual cost for the wafers, and what is the optimal order quantity? b. If the replenishment lead time for wafers…

CHAPTER 5 : DIESEL ENGINE POWER PLANT A six cylinder, four-stroke CI engine is tested against a water brake dynamometer for which B.P = WN/17x10' in kW, where W is the brake load in newton and N is the speed of the engine in the r.p.m. The air consumption was measured by means of a sharp edged orifice. During the test following observersations were taken : • Bore • Stroke • Speed • Brake load Barometer reading = 10 cm = 14 cm = 2500 rpm = 480 N = 76 cm Hg • Orifice diameter • Co-efficient of discharge of orifice • Pressure drop across orifice • Room temperature Fuel Consumption = 3.3 cm = 0.62 = 14 cm of Hg = 25°C = 0.32 kg/min Calculate following : i. The volumetric efficiency The brake mean effective pressure ( b.m.e.p) The engine torque The brake specific fuel consumption ( b.s.f.c ) ii. iv.

The rapid progress of engineering design and information technology has caused difficulties in analyzing system reliability. Because of the increased complexity in system reliability structure (component/subsystem interfaces), many unexpected failure modes could occur, and their behaviors are interdependent. At a system’s design and development stage, the main challenge in analyzing a complex system is the failure uncertainty introduced by the incomplete knowledge of the system. This makes it hard to decompose system reliability into subsystem/component reliability in a deterministic manner, such as series or parallel systems. As a result, some common reliability analysis tools such as fault tree (FT) and reliability block diagram (RBD) become inadequate. Do you agree, why or why not? Are there any other approaches to system reliability assessment beside these tools at the early system’s design and development stage (what are these approaches)?

Basic Manufacturing Process with 2 Job Types + Inspection Time between job arrivals at a machining station is exponentially distributed with mean 4.4 minutes. There are 2 types of jobs to be processed 30% of which is Type 1 and, 70% are of Type 2. Processing times are exponentially distributed. Mean processing time for Type 1 is 4.8 minutes, for Type 2 it is 2.5 minutes. After the job is processed, they go through an inspection process with one single inspector and an inspection time with triangular distribution (1,2,3.5). Inspector decides whether the part is good enough, scrap or should be reworked. 80% of the parts produced is good, 10 % is scrap and the rest needs rework. Rework is done by the same manufacturing machine. The priority among the parts will be Part1 first, part2 second and reworks of both type comes later. Rework time is normally distributed with mean 2 minutes and 0,2 std dev. Simulate the system for one 8-hour day.

S 3: Light gates may be used to measure the speed of projectiles, such as arrows shot from a bow. English longbows made of yew in the 1400s achieved launch speeds of 60 m/s. Determine the relationship between light gates and the accuracy required for sensing the times when the light gate senses the presence of the arrow.

hand written plz 6. Design for , that is, the load can be taken by other members or the effect of fatigue failure otherwise mitigated, until the failed component can be detected and repaired or replaced. This approach is common in aircraft structural design. 7. create variations in dimensions, which can affect wear and fatigue properties. 8. is often used as the starting point to identify the most important problems and the most likely causes. 9. is a type of failure mode identification test, which use one/two samples to establish multiple design inherent failure modes, and establish operating and destruct limits of a product. 10. concerns the improvement in reliability, during use, that comes from field data feedback resulting in modifications.

A beginner reliability engineer did not realize that the failures of the system should be grouped by type instead of having them in one group. The system was observed to fail because of two types of failures: electrical (E) and mechanical (M). The failure data for E are 316, 138, 87, 923, 921, 1113, 1152, 577, 480, 1401 The data for M are 746, 1281, 1304, 1576, 1386, 671, 2106, 660, 1149, 425 The true data for E comes from an exponential distribution with mean = 1000 h, and the data for M comes from Weibull with γ = 2 and θ = 1000. a. What is the reliability expression for the true distribution? b. What is the reliability expression for the combined failures? c. Is the analysis of the engineer correct? Why?

I need answer ASAP. Thank youu!  In a distributed control system application in heavy industries, what are the four commonly encountered (measured, monitored, and controlled) physical variables? 4 only. mass content light temperature surface force flow level pressure humidity discharge charge flow

Unit 7: Dynamic Surfaces and Chains Essay Question :d Cains 333 D 11 M . 11233200 Multiple-Choice Questions What dynamic surfaces can be found in a classic SLR camera? A. Lens B. Shutter C. Aperture adjuster D. Film Which of the following material attributes may present a problem in dynamic surface designing? A. Hardness B. Elasticity C. Opacity D. Smoothness edu.curriculum@stratasys.com Examine the image below. What would you do to improve the nesting layout ad shorten print time? A. Print tall parts and short parts separately B. Rotate tall parts to shorten Z axis height and reduce height differences between two part types C. Align all 6 parts to one row to reduce print-head travel time Increase spacing between parts D.

You’re testing a system that involves a fan, water pump, and compressor. The components are turned ON in sequence and sensor readings are taken, as per a written protocol that you’re following. The system is running as expected after the fan and water pump are turned ON. However, when you turn ON the compressor, it runs for about thirty seconds then stops, consistently. Swapping out the compressor for a different one seems to solve the problem. What could have been the issue with the bad compressor?

During coastdown testing of a family passenger car, the following road load drag force characteristic was derived: FRL = 0.392v²+162 Where FRL is given in Newtons, and v, the vehicle speed in m/s. It is desired that the vehicle should have a top speed of 200km/h. Assuming a transmission efficiency of 90%, which of the following engines would be most suitable? Type BMEP (Bar) Maximum Engine Cubic Capacity Speed (rpm) (CC) Normally aspirated SI engine 11 6500 1400 Turbocharged Sl engine 16 6000 950 Normally aspirated Cl engine 8.5 4500 2400 Turbocharged and aftercooled CI 12 4500 1800 engine

List 3 of the main reliability design analysis techniques

Technical graphics are the preferred method for communicating designs during a design process. True False

2. An operator provides mobile communication service for a city with area of 3500 Km' and has population of 1.56 million. Following parameters have been specified for the cellular network: Downlink band: 800 MHz to 940 MHz, • Channel bandwidth = 200 KHz, • Probability of Blocking 1%, Frequency Parameters i=2 & j=1, Cell radius = 0.85 Km If the user has an average of 2 calls/hour and each call lasts for an average of 3 minutes. Using table 1 obtain: i. Number of users that could be served per a cell, (14 Marks) No. Channels/cell BP= 0.01 BP= 0.005 BP= 0.002 5 1.36 1.13 0.9 10 4.46 3.96 3.43 20 12 11.1 10.1 70 56.1 53.7 51 100 84.1 80.9 77.4

Which tool helps to categorise risks into three colour-coded zones representing major, moderate, and minor risks Risk Priority Number Risk assessment matrix Failure Mode and Effects Analysis O Severity Matrix

Process control can be defined as the act of controlling a final control element to change the manipulated variable. 1. • List FOUR (4) variable that commonly used in oil and gas industries. • Discuss the advantages and disadvantages of the control systems illustrated in figure shown below Sener Contrler Artor Valve Valve Figure 1

subject: quality control topic : six sigma   What are the financial benefits are reported by the organization after the successful implementation in the world?

COMBUSTION ENGINEERING 1. The following details were noted in a test on a single-cylinder four-stroke oil engine: bore = 150 mm; stroke = 160 mm; speed of engine = 500 rpm; fuel consumption = 0.0475 kg/min; calorific value of fuel = 42,000 kJ/kg; the difference in tension on either side of the brake pulley = 400 N; brake circumference = 2.2 m; length of the indicator diagram = 50 mm; area of positive loop of indicator diagram = 475 mm2; area of negative loop = 25 mm?; spring constant = 0.8333 bar per mm. Calculate: a) The Brake Power in kW b) The Indicated power in kW c) The mechanical efficiency d) The Brake thermal efficiency, in percent kg e) The Brake Specific Fuel Consumption, bkW hr

COMBUSTION ENGINEERING 1. The following details were noted in a test on a single-cylinder four-stroke oil engine: bore = 150 mm; stroke = 160 mm; speed of engine = 500 rpm; fuel consumption = 0.0475 kg/min; calorific value of fuel = 42,000 kJ/kg; the difference in tension on either side of the brake pulley = 400 N; brake circumference = 2.2 m; length of the indicator diagram = 50 mm; area of positive loop of indicator diagram = 475 mm²; area of negative loop = 25 mm?; spring constant = 0.8333 bar per mm. Calculate: d) The Brake thermal efficiency, in percent kg e) The Brake Specific Fuel Consumption, bkW-hr

‘The following particulars refer to a two-row velocity-compounded impulse wheel which forms the frst stage of a combination turb Steam velocity at nozzle outlet 1630 mis Mean blade velocity 1125 mls Nozzle angle 116° Outlet angle, first row of moving blades 18 Outlet angle, fixed guide blades 22 Outlet angle, second row of moving blades :36° Steam flow rate 26kg's ‘The ratio of the relative velocity at outlet to that at inlet is 0.84 for all the blade. Determine (a) The velocity of whirl.

As a maintenance engineer at one of the leading manufacturing industries of Oman, (a) How do you differentiate Predictive maintenance from preventive maintenance? Also, mention anyone advantage and one limitation of each which you feel it as important. (Difference any two - , advantage & disadvantage (b) Mention the important points to be considered for the adjustments of belt tension in a lathe machine. В I !

Explain the concept of system reliability and its importance in the field of engineering.

Intro to Transport Processes TRUE or FALSE. Please provide a quick explanation thanks! 1. Each molecule of a system has a certain quantity of mass, thermal energy, or momentum associated with it. 2. Momentum transport in a fluid depends bulk movement of molecules and not on individual molecule of the system.  3. At same mass, the momentum of a molecule is greater than the other molecules if it has less velocity?

With reference to the introductory first week's lecture for this module and the diagram titled 'Manufacturing Systems' answer true or false to the following: Manufacturing systems in an enterprise focus entirely on the technological aspects of the product and production i.e. The manufacturing technology True False

5 Explain the process of load forecasting based on "Curve Fitting" approach.