3074860
Description
Quiz by Lilli Prasath, updated more than 1 year ago
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Created by Lilli Prasath
over 9 years ago
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Question 1
Question
Which of the following gives materials in order of decreasing values of permeability ?
Answer
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Cobalt, Nickel, Aluminium, Iron
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Permalloy, Nickel, Air, Water
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Silver, Copper, Aluminium, Iron
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Pure iron, Silicon iron. Aluminium, Bismuth.
Question 2
Question
In electrical machines the material preferred for pole shoes of electro-magnets is
Answer
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Pure iron
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Aluminium
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Copper
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Lead.
Question 3
Question
If the resistivity of aluminium is 0.0283 x 10-6 Ω-m, the resistivity of copper could be
Answer
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0.017 x 10-5 Ω-m
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0.0382 x 10-5 Ω-m
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0.0832 x 10-6 Ω-m
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0.0889 x 10-6 Ω-m
Question 4
Question
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
Answer
Question 5
Question
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
Answer
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4.46
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3.15
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2.23
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0
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