Electrical Circuits

291. Which one of the following elements serves as a protection against overload?

1. Fuse
2. Switch
3. Resistor
4. Relay

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292. Which statement is true about a passive circuit?

1. A circuit with neither a source of current nor a source of potential difference
2. A circuit with a voltage source
3. A circuit with a current source
4. A circuit with only resistance as a load

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293. Which statement is true?

1. A series resonant circuit is of high impedance
2. A parallel resonant circuit is of low impedance
3. A series resonant circuit is inductive if it operates at a frequency higher than the resonant frequency
4. A parallel resonant circuit is inductive if it operates at a frequency higher than the resonant frequency

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294. Which waveform in which the rms value and the mean value are equal?

1. Square wave
2. Triangular wave
3. Sine wave
4. Sawtooth

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295. Why are inductance and capacitance not relevant in a dc circuit?

1. Because it is a simple circuit
2. Because dc circuits require only resistance as load
3. Because they do not exist in a dc circuit
4. Because frequency of dc is zero

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296. With double the number of turns by the same length and area, the inductance is

1. The same
2. Doubled
3. Quartered
4. Quadrupled

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