Electrical Circuits

21. A real current source has

1. Infinite internal resistance
2. Zero internal resistance
3. Large internal resistance
4. Small internal resistance

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22. A resistor wound with a wire doubled back on itself to reduce the inductance.

1. Bifilar resistor
2. Wire-wound resistor
3. Anti-inductive resistor
4. Bleeder resistor

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23. A rheostat is a form of

1. Variable resistor
2. Variable capacitor
3. Potentiometer
4. Thermocouple

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24. A series RL circuit has R of 10 Ω and X_L of 5 Ω, its impedance in rectangular form is given by

1. 10 + j 5 Ω
2. 10 + j 10 Ω
3. 10 - j 5 Ω
4. 10 - j 10 Ω

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25. A series RLC circuit consists of a 10 Ω resistor in series with L = 10 μH, and C = 100 μF. Determine a new value of I, for which the resonant frequency is one -half the original value.

1. 40 μH
2. 40 mH
3. 40 pH
4. 40 nH

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26. A series RLC circuit has a __________ power factor at its half-power points

1. Unity
2. Leading
3. Lagging
4. Either B or C

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27. A series-parallel combination of identical resistors will

1. Increase the power rating compared with one resistor alone
2. Increase the voltage rating compared with one resistor alone
3. Reduce the voltage rating compared with resistor alone
4. Result in an expensive circuit

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28. A switch designed to have low capacitance between its terminal when open.

1. LOCAP switch
2. AntiLOCAP switch
3. Anticapacitance switch
4. Capacitance switch

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29. A tank circuit is a

1. Parallel LC circuit
2. Series LC circuit
3. A resonant circuit
4. A non-resonant circuit

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30. A term used to express the amount of electrical energy stored in electrostatic field.

1. Joules
2. Coulombs
3. Watts
4. Electron-volt

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