Electrical Circuits

71. For series capacitors, total charge is

1. The sum of individual charges
2. Equal to the charge of either capacitors
3. Equal to the product of the charges
4. The quotient of the charges

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72. Form its definition, the unit of electric field, ξ is the N/C and equivalent unit of ξ is the

1. V(m)²
2. V(m)
3. V/m²
4. V/m

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73. High resistance values are a consequence of the of the __________ film.

1. Thickness
2. Length
3. Thinness
4. Area

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74. How many coulombs are delivered by a storage battery in 25 hours if it is supplying current at the rate of 3 A?

1. 2.592 x 10⁵ C
2. 2.592 x 10³ C
3. 2.592 x 10⁸ C
4. 2.592 x 10¹² C

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75. How many degrees of phase represents one full cycle?

1. 360
2. 180
3. 270
4. 90

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76. If a capacitor is rated for 200V dc, what is its effective ac working voltage?

1. 50 V
2. 100 V
3. 200 V
4. 400 V

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77. If a certain circuit has a current that is lagging the voltage by 45°, then it displays

1. Pure inductive reactance
2. Resistance and capacitance reactance
3. Resistance and inductive reactance
4. Pure capacitive reactance

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78. If a coil has a Q of 10, it means that

1. The energy stored in the magnetic field of the coil is 10 times the energy wasted in its resistance
2. The energy wasted in its resistance is 10 times the energy stored in the magnetic field of the coil
3. It is a low Q coil
4. It is a high Q coil

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79. If a multiplate capacitor has 10 plates, each of area 10 cm2, then

1. 10 capacitors will be in parallel
2. 10 capacitors will be in series
3. 9 capacitors will be in parallel
4. 9 capacitors will be in series

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80. If an emf in circuit A produces a current in circuit B, then the same emf in circuit B produces the same current in circuit A. this theorem is known as

1. Maximum power transfer theorem
2. Millman's theorem
3. Reciprocity theorem
4. Norton's theorem

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