Engineering, 05.12.2019 03:31 ceeejay0621
Athermocouple, with a spherical junction diameter of 0.5 mm, is used for measuring the temperature of hot air flow in a circular duct. the convection heat transfer coefficient of the air flow can be related with the diameter (d) of the sphere and the average air flow velocity (v) as h = 2.2(v /d)0.5, where d, h, and v are in m, w/m2•k, and m/s, respectively. the properties of the thermocouple junction are k = 35 w/m•k, rho = 8500 kg/m3, and cp = 320 j/kg•k. the maximum response time of the thermocouple to record 78 percent of the initially applied temperature difference is 5 s. determine the minimum air flow velocity that the thermocouple can be used.
Answers: 3
Engineering, 04.07.2019 18:10
Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.
Answers: 1
Engineering, 04.07.2019 18:10
The higher the astm grain size number, the finer the gran is. a)-true b)-false
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Engineering, 04.07.2019 18:10
Condition monitoring is a major component of. (clo4) a)- predictive maintenance. b)-preventive maintenance c)-proactive maintenance d)-reactive maintenance.
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Engineering, 06.07.2019 02:30
An electric motor is used to drive a power press which makes steel turning moment diagrams 323 pressings from a metal sheet. the motor runs at a mean speed of 50 rev/s. the torque required is 10.0nm for 0.2s, followed by 1.0nm for0.3 s with this sequence then being repeated. what is the minimum power required of the motor and the moment of incrtia required for the t1ywhcel if the speed fluctuations are to be restricted to 1.5%?
Answers: 3
Athermocouple, with a spherical junction diameter of 0.5 mm, is used for measuring the temperature o...
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