Electrical Circuits

101. In a resonant circuit, if Q 2 10 resonant frequency __________ bandwidth.

1. Bisects
2. Exceeds
3. Is less than
4. Is equal to

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102. In a series circuit with unequal resistances the

1. Highest R has the highest V
2. Lowest R has the highest V
3. Lowest R has the highest I
4. Highest R has the highest I

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103. In a series RLC circuit

1. The current lags VL by 90°
2. The current leads VL by 90°
3. XL leads Xc by 90°
4. Z = jXL at resonance

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104. In adding or subtracting phasor quantities, __________ form is the most convenient.

1. Polar
2. Rectangular
3. Trigonometric
4. Exponential

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105. In an ac circuit with a resistive branch and an inductive branch in parallel, the

1. Voltage across the inductance leads the voltage across the resistance by 90°
2. Resistive branch current is 90° out of phase with the inductive branch current
3. Resistive and inductive branch currents have the same phase
4. Resistive and inductive branch currents are 180° out-of-phase

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106. In an ac circuit with inductive reactance, the

1. Phase angle of the circuit is always 45°
2. Voltage across the inductance must be 90° out-of-phase with the applied voltage
3. Current through the inductance lags its induced voltage by 90°
4. Current through the inductance and voltage across it are180° out-of-phase

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107. In an ac circuit with XL and R in series, the

1. Voltages across R and XL are in phase
2. Voltage across R lags the voltage across XL by 90°
3. Voltages across R and XL are 180° out-of-phase
4. Voltage across R leads the voltage across XL by 90°

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108. In an ac circuit, the power dissipated as heat depends on

1. Impedance
2. Capacitive reactance
3. Resistance
4. Inductive reactance

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109. In an ac wave, 30 degrees of phase is __________ of a cycle.

1. ½
2. 44166
3. 43891
4. 10959

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110. In an inductive coil, the rate of rise of current is maximum

1. Near the final maximum value of current
2. At mid-value of current
3. At half-power points
4. After one time constant

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