Chapter 12, Problem 12.5P

Describe the principle operation of PEMFC, and role of membrane electrode assembly (MEA).

Homework#5

Using graphical methods, draw the pressure angle at the position shown in (a) and (b). e |------- R = Cam Base Radius e = Follower Offset ẞ₁ = Section Duration 1 B₁ = Section Duration 2 ẞ₂ = Section Duration 3 В2 B₁ Follower Position ww R ẞ3 (a) Reference Radial (b)

The figure below illustrates a graph that has a variable load torque and constant drive torque. Each cycle lasts three revolutions (6л radians). Torque (N-m) 600 550 400 1 200 TD= 225 N-m 2 + -T₁ 3 4 1 + 0 In addition, the rotation speed is @o steady-state conditions, determine 1. the average power required, 2πT 4π 5πT 6п Ꮎ = 180° rpm = 18.85 rad/sec, Imachine 125 kg-m². Assuming 2. the maximum and minimum rotational speeds throughout a cycle, 3. the mass of a 0.6-meter-diameter solid disc flywheel to produce Cs = 0.025.

An elastic cord is stretched between 2 points A and B located 2y = 0.8 m apart in the horizontal plane. When stretched directly between A and B, the tension is P₂ = 40 N. The cord is then stretched as shown until its midpoint C has moved through x = 0.3 m to C', and a force of F = 240 N is required to hold the cord at C'. A pellet (m = 0.1 kg) is placed at C' and the cord is released. Find the speed of the pellet as it passes through C.

A 6305 ball bearing is subjected to a steady 5000-N radial load and a 2000-N thrust load and uses a very clean lubricant throughout its life. If the inner race angular velocity is 500rpm find (a) The equivalent radial load (b) The L10 life (c) The L50 life

Slove this the question ple

Determine the Mean Effective Pressure (MEP) in [bar] for a 4-cylinder, 2-Stroke engine with a bore of 85.7 mm, and a stroke of 65.8 mm, that produces 85 hP at 5000 rpm. (Hint: Be careful with units). Note: 1 hP = 0.7457 kW; 100 kPa = 1 bar

Ibraheem Super Q3: A boiler as shown in the figure below is producing 2 kg/s saturated steam at 240C. The water enters the boiler at 24C. The boiler efficiency is 80%. Patm=1.05 bar .Determine: (10 Marks) 1- The inlet pressure of the turbine. 2- If a gauge pressure connected to the outlet pipe, what is the reading of this gauge? 3- Calculate the required diesel in [kg/s]. Assume the calorific value of the diesel is 45000 kJ/kgf 4- Calculate the equivalent evaporation of the boiler 5- Keeping the same inlet conditions and fuel consumption, determine the turbine efficiency if the produced steam was saturated at 300C. Steam Cut Hot Gasses Out Ts=240C Boiler FURNACE A Water In C 24 Examiner Head of Department Ahmad. A. M. Alsak lani