Summarizes the Inventory of Switches 21-45 Answer Key

Question 21 1 / 1 pts Given a wind energy machine with blades that sweep out a 10 m diameter circle, and a wind speed of 2 m/s, approximately what is the maximum power extractable (i.e. taking into account the Betz limit)? Assume that the density of air is 1.2 kg/m3. Hint:Read the lecture PowerPoint. Correct! 224 W Question 22 1 / 1 pts A wind turbine with airfoil blades turns because: Correct! The pressure on the top and the bottom surfaces of the blades are different creating lift Question 23 1 / 1 pts A 2" X 8" beam is used to support a load by placing it in two different orientations as shown above. For the applied load shown, what are the relative magnitudes of the moment of inertia (I)? Hint: Review the lecture PowerPoint on stiffness. Correct! I for Orientation 1 < I for Orientation 2 Question 24 1 / 1 pts The structure shown in the figure has a height L, a moment of inertia I, and a modulus of elasticity E. A load F is applied at the top of the structure. What is the stiffness of this structure? hint: review the PowerPoint slides on stiffness. Correct! 3EI/L3 Question 25 1 / 1 pts If you were to design and construct five identical turbine towers, but use a different material for each one, which would be the stiffest? Correct! 4340 steel E = 200 GPa or 36,000 Ksi Question 26 1 / 1 pts The stiffness of an axially loaded bar (a bar in tension or compression as shown in the figure above) depends on...? Select all that apply (hint: review the structures and stiffness powerpoint lecture) Correct! The stiffness of the material, represented by its Young's Modulus (E) Correct! The cross sectional area of the bar Correct! The length of the bar Question 27 What is the value of R at the end of this C code? x=4; y=5; z=8; x=x+y; R=y; if (x>y) { R=x; } if(z>x&&z>y) { R=z; } 1 / 1 pts Correct! R=9 Question 28 What are the values of A and B at the end of this code? int A; int B; A=2; B=5; if ((A + B) > 7) {A=B; B = A; } else { B = A*B; A = B+5; } Correct! A=15, B=10 Yes - correct answer 1 / 1 pts Question 29 1 / 1 pts Given the following piece of C code, at the end of the program what is the value of A and B? A = 10 ; B = 12 ; if ((A + B) < 22) {B=A; A = B; } else { A = B; B = A + B; } Correct! A=12, B=24 Question 30 1 / 1 pts Given the following piece of C code, at the end of the program what is the value of x and y? x=0; y=1; while (x<9) { y = y + x; x=x+4; } Correct! x=12, y=13 correct- good job Question 31 1 / 1 pts Given the following piece of C code, at the end of the ‘while loop’, what is the value of x? x=0; y=10; while (y>8) { y = y - 1; x=x+y; } Correct! 17 Question 32 1 / 1 pts Given the following piece of C code, how many times (n) does it loop through the while loop? int i; int control; control =1; i=1; while(control ==1) { i=i+1; if(i>2) { control =2; } if(i==2) { control =3; } } Correct! n=1 Yes - on the first time through the value of control changes to 3 Question 33 You can practice engineering without a professional license. Correct! True Reading Engineering Professions PPT to learn about licensing. 1 / 1 pts Question 34 1 / 1 pts The code shown is from the main Go To Beacon program. In this program, what does "While (1 = = 1) mean? Correct! while (1== 1) will cause the program to loop an infinite number of times Question 35 1 / 1 pts A bumper switch is mounted to a robot. The bumper switch is connected to digital input port #2. The right wheel is attached to motor port 2 and the left wheel is attached to motor port 3. The following program is used to control this robot. bumper = GetDigitalInput(2); SetPWM(2,50); SetPWM(3,-50); while (1== 1) { if (bumper ==0) { SetPWM(2,-50); SetPWM(3,50); } } Which one of the following statements most likely describes the behavior of this robot? Correct! The robot will move backward forever regardless if the bumper hit something or not. You need to move the statement to read the bumper switch inside of the while statement. Question 36 1 / 1 pts If all people on Earth had the same consumption habits as Americans, how many Earths would be needed in order to provide what the world's population would consume? Correct! 6 Earths Question 37 1 / 1 pts Which one of these is the most commonly found greenhouse gas in the atmosphere? Correct! H2 O Question 38 1 / 1 pts The following book reference is incorrectly formatted according to APA author-date format. Identify all of the problems. Fleddermann, Charles B. 2008. Engineering Ethics, 3rd Ed. Upper Saddle River, NJ: Prentice Hall. Look in your Everyday Writer for help on this question. Correct! Only the initials of the first name should be used, not the full name. Correct! The date needs to be in parenthesis. Correct! The book title needs to be italicized. 1 / 1 pts Question 39 The following APA citation is in a student's reference list Huntzinger, D. N., Hutchins, M. J., Gierke, J. S., & Sutherland, J. W. (2007). Enabling sustainable thinking in undergraduate engineering education. Int. J. of Engineering Education, 23(2), 218-230. Match the parts of the citation. Correct! Huntzinger, D. N., Hutchins, authors M. J., Gierke, J. S., Sutherland, J. W. Correct! Enabling sustainable article title thinking in undergraduate engineering education. Correct! 23(2) journal volume Correct! Int. J. of Engineering journal title Education Correct! 218-230 page numbers Other Incorrect Match Options: copyright publisher Question 40 1 / 1 pts The first and foremost obligation of registered professional engineers is to: Correct! The public welfare Question 41 1 / 1 pts When evaluating the moral status of performing an action it is important to consider consequence and intentions. Correct! True Question 42 A choice between two equally unfavorable or disagreeable alternatives is called Correct! a dilemma 1 / 1 pts Question 43 1 / 1 pts The Loft command in 3D modeling program (SolidWorks) requires ... Correct! Two section profiles with or without a path Question 44 1 / 1 pts The process of making multiple copies of a feature (like a turbine blade on a hub) in SolidWorks is called, ‘lofting’. Correct! False Question 45 What is the value of the binary number 01110? Correct! 14 1 / 1 pts Quiz Score: 45 out of 45