Which of the following gives materials in order of decreasing values of permeability ?
Respuesta
Cobalt, Nickel, Aluminium, Iron
Permalloy, Nickel, Air, Water
Silver, Copper, Aluminium, Iron
Pure iron, Silicon iron. Aluminium, Bismuth.
Pregunta 2
Pregunta
In electrical machines the material preferred for pole shoes of electro-magnets is
Respuesta
Pure iron
Aluminium
Copper
Lead.
Pregunta 3
Pregunta
If the resistivity of aluminium is 0.0283 x 10-6 Ω-m, the resistivity of copper could be
Respuesta
0.017 x 10-5 Ω-m
0.0382 x 10-5 Ω-m
0.0832 x 10-6 Ω-m
0.0889 x 10-6 Ω-m
Pregunta 4
Pregunta
Three moving iron type voltmeters are connected as shown below. Voltmeter readings are V, V and V 1 2 as indicated. The correct relation among the voltmeter
readings is
The input impedance of the permanent magnet moving coil (PMMC) voltmeter is infinite. Assuming that the diode shown in the figure below is ideal, the reading of the voltmeter in Volts is