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Electric Circuits

Electric Circuits
How many 200W / 220V bulbs connected in series across 220V supply will consume 100W?

 4.
 1.
 Not possible.
 2.

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Electric Circuits
The resistivity of semi-conductors at room temperatures is

 109 to 1012 ohm - cm.
 1000 to 1500 ohm - cm.
 1.6 × 106 to 100 × 106 ohm - cm.
 0.01 to 50 ohm - cm.

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Electric Circuits
Two resistors R1 and R2 give combined resistance of 4.5 Ohm when connected in series and 1 Ohm when in parallel, the resistances are

 2.2 Ohm and 2.3 Ohm.
 1.5 Ohm and 3 Ohm.
 1.25 Ohm and 3.25 Ohm.
 2 Ohm and 2.5 Ohm.

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Electric Circuits
Reciprocity condition for h parameters is

 h12 = - h21.
 h12 = h21.
 h12 = h21.
 h11h22 - h21h12 = 0.

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Electric Circuits
In direct arc furnace which of following is of high value?

 Current.
 All of above.
 Power factor.
 Voltage.

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Electric Circuits
Which cell has the reversible chemical reaction?

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

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MORE MCQ ON Electric Circuits

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