Can there be an psychological component to mechanical ventilator dependence? If so, what factors contribute to the dependence?
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Can there be an psychological component to
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- What do you mean by reliability method of design? What is the role of statistics and probability in designing for reliability?A compressor that has been in service for 20 years has finally broken down beyond repair, and now must be replaced. The old 180hp machine cost $1200 and its cost index at that time was 144.5. The new machine will be 400hp. How much will the new machine cost, given that today's compressor index is 252.4 and the power-sizing exponent for compressor sizing is 0.32? A: $929 B: $2706 C: $1434 D: $2096 E: $1549Determine the size of the control valve for each of the following liquid flow applications. Use a safety factor of 25%:
- Oven Temperature 0 wwwwww Valve ↑y Steam B Piston Oil Supply H Working Cylinder Fig. Q3 Fig. Q3 shows an arrangement for controlling the temperature of a steam heated oven. utilizing temperature sensitive bellows and a hydraulic servomechanism. An increase in oven temperature causes the bellows to expand and the left end of the 'walking beam' ABC to move downwards. thus activating the hydraulic mechanism. The end C of the walking beam actuates a valve to reduce or increase the steam flow into the oven depending on the temperature in the oven. When .x is zero the beam ABC whose mid-point is B, is horizontal. Given that, (a) oil flow in the servomechanism per unit displacement (b) area of cross section of the piston in the working cylinder -Q = A (c) heat transfer across the walls of bellows to the thermos- sensitive fluid in the bellows =q=H(0-1) where I' is the temperature of the fluid inside the bellows and H is a constant. (d) rate of change of temperature in the bellow's fluid Kq…What is the relevance of geothermal power plant to the course mechanical engineering?What does the term "tolerance" refer to when designing dynamic surfaces? A. Material durability B. The space between connected parts, designed for supported materials C. The friction and resistance between connected parts D. The dynamic surface design complexity Which of the following parameters must be considered before the design phase of a dynamic surface? Select all correct answers. A. Tolerance B. Element size C. Friction D. Minimum thickness E. Support material removal F. Positioning A dynamic surface is an array of connected surfaces that produces a mechanical effect; the movement of one surface causes predictable movement of the others. A. True B. False Which of the following are basic elements of 2D nesting? Select all correct answers. A. Part orientation B. Part combinations C. Spacing between parts D. Material selection Which of the following are benefits of proper nesting and positioning? Select all correct answers. A. Reduced material waste B. Reduced energy usage due to…
- (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 systemWhen does a system typically reach the end of its useful lifecycle?A study of the response of a human body subjected to vibration/shock is important in many applications. In a standing posture, the masses of head, upper torso, hips, and legs and the elasticity/ damping of neck, spinal column, abdomen, and legs influence the response characteristics. Develop a sequence of three improved approximations for modeling the human body. Restraint -Windshield Seat belts Instrument panel -Slant footboard Impact force Floor
- Determine the output pressure of a compressor operating with the following data: a. Actual power required to drive the compressor is 20 kW. b. Overall efficiency of the compressor is 75%. c. Compressor delivers four standard m3/min. d. Compressor inlet pressure is 100 kPa abs.8.a. When a machine is tested, the volume of cooling air is 1250 cfm. If the temperature of the entering air is 25 C and the temperature of the outgoing air is 35 C, the loss in the machine isA. 7.1 kw.B. 24.8 kw.C. 12.5 kw.D. 17.7 kw. 8.b. When a motor is tested with a prony brake, the scale reading is 3.50 lb. The length of the brake arm is12 in. and its weight is 0.50 lb. If the motor speed is 1700 rpm and the power input is 1050 watts, themotor efficiency isA. 80.5%B. 69%C. 75%.D. 64.5%.(1) A rigid bar (OA)with mass m and length L is simply supported at one end and free at the other end .A lumped mass M fixed at the end of A is subjected to a vertical harmonic excitation f(t). Two springs (k) are connected at the length a and b of the bar. Please calculate the natural frequency and response vibration of the system. (Figure 1) Note: m=10kg, L=1 m, a=0.25m, b=0.5m, k-5000N/m, M=50kg, f(t)=Fcos.Qt (F=500N, Q=1000rpm). The vibration is very small. a b k L k + m M Figure 1: Single Degree Vibration System+ f(1) A X (2) Please write out the Equation of Movements of the following system using matrix. (Figure 2)