Engineering, 29.10.2019 05:31 lupitaca888
Atruncated solid cone is of circular cross section, and its diameter is related to the axial coordinate by an expression of the form d=ax3/2 , where a= 1.0 m-1/2. the sides are well insulated, while the top surface of the cone at x1 is maintained at t1 and the bottom surface at x2 is maintained at t2 . what is the rate of heat transfer across the cone if it is constructed of pure aluminum with x1= 0.075 m, t1= 135°c, x2= 0.225 m, and t2= 20°c? evaluate the properties of aluminum at t¯= 333 k
Answers: 2
Engineering, 04.07.2019 18:10
During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false
Answers: 2
Engineering, 04.07.2019 18:10
Which of the following ziegler nichols tuning methods the response of the controller to a step input should exhibit an s-shaped curve? a)-open loop mode b)-closed loop mode c)-both modes (open & closed) d)-none of the modes (open & closed)
Answers: 3
Engineering, 04.07.2019 18:20
Air flows over a heated plate àt a velocity of 50m/s. the local skin factor coefficient at a point on a plate is 0.004. estimate the local heat transfer coefficient at this point.the following property data for air are given: density = 0.88kg/m3 , viscosity 2.286 x 10 ^-5 kgm/s , k = 0.035w/mk ,cp = 1.001kj/kgk. use colburn reynolds analogy.
Answers: 1
Engineering, 04.07.2019 19:10
The short distance from the objective lens to the object causes problems at high magnification. which of the following is the most serious? a. cleaning the object surface b. positioning the object c. reflection from the object surface. d. illumination of the object
Answers: 1
Atruncated solid cone is of circular cross section, and its diameter is related to the axial coordin...
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