# Control Systems Mcqs

Q:

A) 4, 3 | B) 3, 4 |

C) 4, 5 | D) 5, 4 |

Answer & Explanation
Answer: A) 4, 3

Explanation: There are 4 types of controllers namely PID, PI, PD. There are 3 types of compensators namely Lag, Lead & Lag-Lead compensators.

Explanation: There are 4 types of controllers namely PID, PI, PD. There are 3 types of compensators namely Lag, Lead & Lag-Lead compensators.

47

Q:

A) Receive control signals | B) Transmit control signals |

C) Modify control signals | D) Create control signals |

Answer & Explanation
Answer: C) Modify control signals

Explanation: Controller is needed to modify control signals for better control action. Some control signals are raw signals which can’t function properly so we use controllers for modifying them.

Explanation: Controller is needed to modify control signals for better control action. Some control signals are raw signals which can’t function properly so we use controllers for modifying them.

47

Q:

A) False | B) True |

Answer & Explanation
Answer: B) True

Explanation: There are 5 basic components of an automatic control system. They are error detector, amplifier, actuator, plant, and sensor. So, Actuator is a basic component of automatic control system.

Explanation: There are 5 basic components of an automatic control system. They are error detector, amplifier, actuator, plant, and sensor. So, Actuator is a basic component of automatic control system.

45

Q:

A) Infinity | B) 5 |

C) 10 | D) 20 |

Answer & Explanation
Answer: D) 20

Explanation: As limit s tends to zero s² G(s) H(s) = s2 G(s) = 10*2/1 = 20. Therefore we get the value of Ka as 20 and both kv and ks are infinity.

Explanation: As limit s tends to zero s² G(s) H(s) = s2 G(s) = 10*2/1 = 20. Therefore we get the value of Ka as 20 and both kv and ks are infinity.

63

Q:

A) True | B) False |

Answer & Explanation
Answer: A) True

Explanation: It must offer selectivity, that is, an optimal adjustment of parameters must clearly distinguish non optimal adjustment of parameters. If there was no selectivity we would not have been able to distinguish between parameters.

Explanation: It must offer selectivity, that is, an optimal adjustment of parameters must clearly distinguish non optimal adjustment of parameters. If there was no selectivity we would not have been able to distinguish between parameters.

54

Q:

A) 75 | B) 25 |

C) 20 | D) 10 |

Answer & Explanation
Answer: C) 20

Explanation: The peak overshoot is decreased by increasing the damping ratio. The damping ratio is increased by reducing the gain K by same proportion and for decreasing the peak overshoot from 75% to 25% the factor of amplitude becomes 19.6% which is approximately 20%.

Explanation: The peak overshoot is decreased by increasing the damping ratio. The damping ratio is increased by reducing the gain K by same proportion and for decreasing the peak overshoot from 75% to 25% the factor of amplitude becomes 19.6% which is approximately 20%.

100

Q:

A) Resistance | B) Conductance |

C) Flux | D) Voltage |

Answer & Explanation
Answer: B) Conductance

Explanation: As Resistance is the analogous element of B in F-V analogy so here it is the reciprocal of resistance, conductance is the answer. Force voltage analogy means both the equations will have differential equation of the same form.

Explanation: As Resistance is the analogous element of B in F-V analogy so here it is the reciprocal of resistance, conductance is the answer. Force voltage analogy means both the equations will have differential equation of the same form.

35

Q:

A) 0.13% | B) 1.13% |

C) 1.26% | D) 1.52% |

Answer & Explanation
Answer: D) 1.52%

Explanation: Damping ratio is calculated from the characteristic equation and placing that value in the formula for peak overshoot Mp = e3.14DR (1- DR2) we get the answer. Peak overshoot arises especially in the step response of the systems such as low pass filters which are band limited.

Explanation: Damping ratio is calculated from the characteristic equation and placing that value in the formula for peak overshoot Mp = e3.14DR (1- DR2) we get the answer. Peak overshoot arises especially in the step response of the systems such as low pass filters which are band limited.

56