# Signals & Systems Mcqs

Q:

A) Periodic with fundamental period 2π | B) Periodic but with no fundamental period |

C) Non-periodic and discontinuous | D) Non-periodic but continuous |

Answer & Explanation
Answer: C) Non-periodic and discontinuous

Explanation: From the graphs of cos and sin, we can infer that at t=0, the function becomes discontinuous.

Since, cos 0 = 1, but sin 0 = 0

As 1 ≠ 0, so, the function X (t) is discontinuous and therefore Non-periodic.

Explanation: From the graphs of cos and sin, we can infer that at t=0, the function becomes discontinuous.

Since, cos 0 = 1, but sin 0 = 0

As 1 ≠ 0, so, the function X (t) is discontinuous and therefore Non-periodic.

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Q:

A) A rectangular pulse of duration T | B) A rectangular pulse of duration 2T |

C) A triangular pulse of duration T | D) A triangular pulse of duration 2T |

Answer & Explanation
Answer: D) A triangular pulse of duration 2T

Explanation: Not available for this question

Explanation: Not available for this question

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Q:

A) The same | B) Reciprocal of each other |

C) Negative of each other | D) Complementary |

Answer & Explanation
Answer: B) Reciprocal of each other

Explanation: Not available for this question

Explanation: Not available for this question

71

Q:

A) E | B) 100E |

C) E/100 | D) 400E |

159

Q:

A) All coils in parallel | B) All coils in series |

C) Series-parallel connection with two in each arm | D) Series-parallel connection with one in each arm |

Answer & Explanation
Answer: B) All coils in series

Explanation: Since the CT supplies the current to the current coil, therefore the coils are connected in series so that the current remains the same. If they were connected in parallel then the voltages would have been same but the currents would not be the same and thus efficiency would decrease.

Explanation: Since the CT supplies the current to the current coil, therefore the coils are connected in series so that the current remains the same. If they were connected in parallel then the voltages would have been same but the currents would not be the same and thus efficiency would decrease.

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Q:

A) Electrostatically coupled | B) Electrically coupled |

C) Electromagnetically coupled | D) Conductively coupled |

Answer & Explanation
Answer: C) Electromagnetically coupled

Explanation: A PT cannot be electrostatically coupled since CRO are electrostatically coupled. Also, they cannot be conductively coupled. But since they are kind of electrically coupled hence electromagnetically coupled is the only correct option.

Explanation: A PT cannot be electrostatically coupled since CRO are electrostatically coupled. Also, they cannot be conductively coupled. But since they are kind of electrically coupled hence electromagnetically coupled is the only correct option.

180

Q:

A) 1 | B) 6 |

C) 17 | D) 16 |

179

Q:

A) Infinite | B) Zero |

C) One | D) Finite |

Answer & Explanation
Answer: A) Infinite

Explanation: From any Impulse train waveform, we can infer that it is a kind of signal having infinite discontinuity.

Explanation: From any Impulse train waveform, we can infer that it is a kind of signal having infinite discontinuity.

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