Engineering, 07.06.2021 20:10 wolfsaway
A moving-coil ammeter has a fixed shunt of 0.02 Ω. With a coil resistance of R = 1000
Ω and a potential difference of 500 mV across it. Full-scale deflection is obtained. (a)
To what shunted current does it correspond? (b) Calculate the value of R to give fullscale deflection when shunted current I is (i) 10 A, and (ii) 75 A, (c) With what value of
R, 40% deflection obtained with I = 100 A.
Answers: 3
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Engineering, 04.07.2019 18:20
Describe one experiment in which the glass transition temperature and melting temperature of a totally amorphous thermoplastic material can be determined. show the relevant experimental results in a diagram which should be properly annotated with the two temperatures clearly marked. what is likely to happen to the curve in the diagram if the amorphous polymer is replaced by a thermosetting type?
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Engineering, 04.07.2019 18:20
Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.
Answers: 1
A moving-coil ammeter has a fixed shunt of 0.02 Ω. With a coil resistance of R = 1000
Ω and a poten...
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