Circuits and Circuit Theory

101.Two waves of the same frequency have opposite phase when the phase angle between them is

1. 360°
2. 180°
3. 90°
4. 0°

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102.What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value?

1. 0°
2. 45°
3. 90°
4. 180°

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103.When an alternating current passes through an ohmic resistance the electrical power converted into heat is

1. apparent power
2. true power
3. reactive power
4. none of the above

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104.Which of the following circuit component opposes the change in the circuit voltage?

1. Inductance
2. Capacitance
3. Conductance
4. Resistance

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105.Which of the following coil will have large resonant frequency?

1. A coil with large resistance
2. A coil with low resistance
3. A coil with large distributed capacitance
4. A coil with low distributed capacitance

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106.Which of the following refers to a parallel circuit?

1. The current through each element is same
2. The voltage across element is in proportion to it’s resistance value
3. The equivalent resistance is greater than any one of the resistors
4. The current through any one element is less than the source current

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107.Which of the following statements pertains to resistors only?

1. can dissipate considerable amount of power
2. can act as energy storage devices
3. connecting them in parallel in¬creases the total value
4. oppose sudden changes in voltage

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108.Which of the following waves has the highest value of peak factor?

1. Square wave
2. Sine wave
3. Half wave rectified sine wave
4. Triangular wave

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109.Wire-wound resistors are unsuitable for use at high frequencies because they

1. create more electrical noise
2. are likely to melt under excessive eddy current heat
3. consume more power
4. exhibit unwanted inductive and capacitive effects

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