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Electric Circuits

Electric Circuits
Which cell has the reversible chemical reaction?

 Mercury oxide.
 Lead acid.
 Carbon Zinc.
 Silver oxide.

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Electric Circuits
A series circuit consists of R = 20 Ω, L = 20 mH, and AC supply 60 V with f = 100 Hz. The phase angle of current in respect of supply voltage will be

 28.8o.
 32.1o.
 20.2o.
 40.4o.

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Electric Circuits
When a lossy capacitor with a dielectric of permittivity ε and conductivity σ operates at a frequency ω the loss tangent for the capacitor is given by

 ω σ/ε.
 σ ω ε.
 ω ε/σ.
  σ/ω ε.

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Electric Circuits
During charging, the electrolyte of a lead acid battery becomes

 diluted with water.
 stronger.
 there is no change in electrolyte.
 weaker.

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Electric Circuits
Mesh analysis is prefered when loops are------nodes

 any of the above
 equals to
 greater than
 less than

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Electric Circuits
In a series resonance circuit if bandwidth is 1 MHz and inductance is 1 mH, then what is the resistance value?

 100 Ω
 1 MΩ
 1 KΩ
 1 Ω

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