Question

Assignment 1 1. A permanent magnet moving coil instrument has a coil of dimensions 15mm x 12 mm. The flux density in the air gap is 1.8 x 10^3 Wb/m^2 and the spring constant is 0.14 x 10^-6 Nm/rad. Determine the number of turns required to produce an angular deflection of 90 degrees when a current of 5mA is flowing through the coil. 2. The control spring of an instrument has the following dimensions: Length of strip =370 mm , thickness of strip =0.073 mm, width of strip= 0.51mm The young modulus is 112.8 GN/m^2. Estimate the torque exerted by spring when it is turned through 90º. 3. The coil of a moving coil voltmeter is 40mm long and 30mm wide and has 100 turns on it. The control spring exerts a torque of 240 x 10^-6 N-m when the deflection is 100 divisions on full scale. If the flux density of the magnetic field in the air gap is 1.0 wb/m^2, estimate the resistance that must be put in series with the coil to give one volt per division. The resistance of the voltmeter coil may be neglected.

          Assignment 1
1. A permanent magnet moving coil instrument has a coil of dimensions 15mm x 12 mm. The flux density in the air gap is 1.8 x 10^3 Wb/m^2 and the spring constant is 0.14 x 10^-6 Nm/rad. Determine the number of turns required to produce an angular deflection of 90 degrees when a current of 5mA is flowing through the coil.
2. The control spring of an instrument has the following dimensions:
Length of strip =370 mm , thickness of strip =0.073 mm, width of strip= 0.51mm
The young modulus is 112.8 GN/m^2. Estimate the torque exerted by spring when it is turned through 90º.
3. The coil of a moving coil voltmeter is 40mm long and 30mm wide and has 100 turns on it. The control spring exerts a torque of 240 x 10^-6 N-m when the deflection is 100 divisions on full scale. If the flux density of the magnetic field in the air gap is 1.0 wb/m^2, estimate the resistance that must be put in series with the coil to give one volt per division. The resistance of the voltmeter coil may be neglected.

Assignment 1
1. A permanent magnet moving coil instrument has a coil of dimensions 15mm x 12 mm. The flux density in the air gap is 1.8 x 10^3 Wb/m^2 and the spring constant is 0.14 x 10^-6 Nm/rad. Determine the number of turns required to produce an angular deflection of 90 degrees when a current of 5mA is flowing through the coil.
2. The control spring of an instrument has the following dimensions:
Length of strip =370 mm , thickness of strip =0.073 mm, width of strip= 0.51mm
The young modulus is 112.8 GN/m^2. Estimate the torque exerted by spring when it is turned through 90º.
3. The coil of a moving coil voltmeter is 40mm long and 30mm wide and has 100 turns on it. The control spring exerts a torque of 240 x 10^-6 N-m when the deflection is 100 divisions on full scale. If the flux density of the magnetic field in the air gap is 1.0 wb/m^2, estimate the resistance that must be put in series with the coil to give one volt per division. The resistance of the voltmeter coil may be neglected.

Added by Travis G.

Question

Please give Ace some feedback