Jerk Exam

Operational research is a scientific approach for decision making that seeks to determine the best design under the constraints. Select one: O True O False

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.

5 In a stop watch time study, the actual readings in minutes, recorded for an element are: 0.05, 0.06, 0.05, 0.05, 0.05, 0.06, 0.06, 0.05, 0.06, 0.06, 0.06, 0.06, 0.05, 0.05, 0.06 and 0.05 ) Have sufficient number of readings.been taken for 95% confidence level and ±5% accurancy? (ii) If the rating is 120% what would be the normal time for element?

Which of the following does not correctly represent a dependent and independent relationship? a. Independent variable:Time of day Dependent variable: Outside temperature b. Independent variable:Number of gallons of gas in a car’s tank Dependent variable: Number of miles a car can be c. Independent variable:Number of coins put into a gumball machine Dependent variable: Number of gumballs d. Independent variable: Pace of a runner in a race Dependent variable: Time it takes to complete the race

Operational research is a scientific approach for decision making that seeks to determine the best design under the constraints. true or false

List the procedure for mathematical models for engineering processes in the correct order. Rank the options below. The problem is formulated mathematically. Reasonable assumptions and approximations are made. The problem is solved using an appropriate approach, and the results are interpreted. The relevant physical laws and principles are invoked. The Interdependence of the variables is studied. All the variables that affect the phenomena are identified. ▸

In the purchase model of inventory, if the standard deviation of annual demand of a product is 100 units for a service level of 99.87 percent, the safety stock is

Q.49 A person operates a machine that makes capacitors. He has been advised to keep the track of the percentage defectives at his work center. He knows that this type of process, they expect about 4% defectives plus or minus some chance variation. He wishes to initially construct a control chart for defectives. He has prepared ten daily samples of hundred capacitors each. Sample No. 1 2 3456 789 10 % defectives 4 3 36 195 12 4 3 ) Construct the relevent control chart. What are upper and lower control limits?

23 In manufacturing process, Cost and Quality are directly related. Select one: True False

A new electronic component for aircraft is tested to withstand temperatures as low as -50°F. One engineer suggests that the device cannot actually stand temperatures that low. What are the Type I and Type II errors? Type I: The device CAN NOT withstand temperatures as low as -50F but the engineer incorrectly finds that it CAN.Type II: The device CAN withstand temperatures as low as -50F but the engineer incorrectly finds that it CAN NOT.   Type I: The device CAN withstand temperatures as low as -50F but the engineer incorrectly finds that it CAN NOT.Type II: The device CAN NOT withstand temperatures as low as -50F but the engineer incorrectly finds that it CAN.    Is the answer the first or second bullet point?

Quality Engineering question Pleas, explain briefly the necessity and benefit of collecting data and using statistical methods in production processes. Pleas, list the types of data collected and analyses implemented (graphics followed) with their reason.  Please answer in your own words. Thank you.

Q.56 In a stop watch time study, the actual readings in minutes, recorded for an element are! 0.05, 0.06, 0.05, 0.05, 0.05, 0.06, 0.06, 0.05, 0.06, 0.06, 0.06, 0.06, 0.05, 0.05, 0.06 and 0.05 (1) Have sufficient number of readings.been taken for 95% confidence level and ±5% accurancy? (1) If the rating is 120% what would be the normal time for element? fatique

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

From the following identify the true statement relating to the term Predictive maintenance The maintenance on machines not to determine the actual time to failure and cannot improve the quality of the product. The maintenance on machines to determine the actual time to failure and can improve the quality of the product. The maintenance on machines not to determine the actual time to failure and can improve the quality of the product. The maintenance on machines to determine the actual time to failure and cannot improve the quality of the product.

1- Select the optimum choice for: high speed air craft skins material. Table 1: The properties of metallic materials E, GPa| Max. use temp.,'C | Density, Mg/cm' | ay, MPa Relative cost per unit sheet area Material 200 2.8 300 2 Aluminum alloy Carbon steel 69 200 350 7.8 350 Stainless steel 193 700 7.8 650 6 8.9 600 6 Nickel alloy Titanium alloy 207 1000 116 600 4.5 900 10 Table 2: Weighting factor Specific yield strength: Max, use temperature: Youngs modulus: 4 2

How do expectations about future economic conditions influence the speed of adjustment in the error correction model (ECM)? Are there any other factors that might affect the speed of adjustment?

Statistical Inference

You are the mechanical engineer supervising the layout of a piping system. In a certain portion of the pipe, the specifications are as follows: length of pipe is 10m, inside diameter of 30cm, outside diameter of 30.5cm, maximum allowable speed of 15m/s and a coefficient of 0.003456. If the uncertainties are 0.02mm for length, 0.8mm for the diameters and 0.1mm/s for the velocity, what loss of head will be imminent in this pipe? In the piping system above, what is the uncertainty in computed head loss contributed by the velocity of the pipe?

You are the mechanical engineer supervising the layout of a piping system. In a certain portion of the pipe, the specifications are as follows: length of pipe is 10m, inside diameter of 30cm, outside diameter of 30.5cm, maximum allowable speed of 15m/s and a coefficient of 0.003456. If the uncertainties are 0.02mm for length, 0.8mm for the diameters and 0.1mm/s for the velocity, what loss of head will be imminent in this pipe?

You are the mechanical engineer supervising the layout of a piping system. In a certain portion of the pipe, the specifications are as follows: length of pipe is 10m, inside diameter of 30cm, outside diameter of 30.5cm, maximum allowable speed of 15m/s and a coefficient of 0.003456. If the uncertainties are 0.02mm for length, 0.8mm for the diameters and 0.1mm/s for the velocity, what loss of head will be imminent in this pipe? With all the above uncertainties, what is the total uncertainty in the head loss?

According to the Theory of Constraints, all the money invested in a system in purchasing things that it intends to sell is inventory Select one: True False

Questions Finite Element Method (FEM) is a great tool to analytical engineering, mostly in mechanical Engineering and Nondestructive testing applications; Finite Element Method cannot exist without the model Data from Computer Aided Draughting. The connection of Computer aided Draughting (CAD) and Finite Element Analysis (FEA) cannot be under played in solving and making predictive analysis. Explain the following school of thought using following set of questions: • What is Finite Element Method? What is FEA? What is CAD? • Explain the types of Analyses that can carried on FEA and CAD 1 when combined together • How does CAD model data Affect FEA output? • Where or which branch/part of Mechanical Engineering does FEM best suit or most applicable and explain why • FEA can further enhance the design or production of machine part , list and explain the parameter that can be optimized. Also Explain the term design optimization. • What are the benefits of FEA? What is the Demerit of FEA? In…

What quantitative techniques are useful in decision making? Explain your answer. note: quantitative techniques are the following 1. Inventory models 2. Queuing theory 3. Network models 4. Forecasting 5. Regression analysis 6. Simulation 7. Linear programming 8. Sampling theory 9. Statistical decision theory

Why balancing is important in the engineering components

Q.46 Robot Ltd. wishes to maintain enough safety stock during the lead time period between starting a new production run and its completion such that the probability of satisfying the customer demand during the lead time period is 95%. The lead time period is 5 days and daily customer demand can be assumed to follow the Gaussian (normal) distribution with mean 50 units and a standard deviation of 10 units. Using o-(0.95) = 1.64, where o represents the cumulative distribution function of the standard normal random variable, the amount of safety stock that must be maintained by Robot Ltd. to achieve this demand fulfilment probability for the lead time period is units. [Round off to two decimal places]