Engineering, 25.04.2020 11:39 miner12924owhu4d

A full-scale deflection of 90° is produced by a current of 10mA flowing
through the moving coil of d. c instrument. Determine the value of the
shunt resistance required to produce full-scale deflection with 12mA, the
resistance of the coil and springs being 1.2ohms. The constant of the control
spring is 3x20^-5 N-m/rad and the moment of inertia of the coil is 4x10^-7 kg-m². Assuming that the shunt produces the only available magnetic damping and that air damping is negligible derive an expression for, and
determine the value of, the periodic time of the coil system. Calculate the
ratio of the amplitude of consecutive swings.

Answers: 3

Show answers

Another question on Engineering

Engineering, 04.07.2019 18:10

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

Answers: 1

Answer

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

Answer

Engineering, 04.07.2019 18:10

Fluids at rest possess no flow energy. a)- true b)- false

Answers: 3

Answer

Engineering, 04.07.2019 18:10

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater

Answers: 3

Answer

You know the right answer?

A full-scale deflection of 90° is produced by a current of 10mA flowing
through the moving coil...

Questions